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Chen JC, Lin HY, Novák O, Strnad M, Lee YI, Fang SC. Diverse geotropic responses in the orchid family. PLANT, CELL & ENVIRONMENT 2024. [PMID: 38809156 DOI: 10.1111/pce.14975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 03/28/2024] [Accepted: 05/14/2024] [Indexed: 05/30/2024]
Abstract
In epiphytes, aerial roots are important to combat water-deficient, nutrient-poor, and high-irradiance microhabitats. However, whether aerial roots can respond to gravity and whether auxin plays a role in regulating aerial root development remain open-ended questions. Here, we investigated the gravitropic response of the epiphytic orchid Phalaenopsis aphrodite. Our data showed that aerial roots of P. aphrodite failed to respond to gravity, and this was correlated with a lack of starch granules/statolith sedimentation in the roots and the absence of the auxin efflux carrier PIN2 gene. Using an established auxin reporter, we discovered that auxin maximum was absent in the quiescent center of aerial roots of P. aphrodite. Also, gravity failed to trigger auxin redistribution in the root caps. Hence, loss of gravity sensing and gravity-dependent auxin redistribution may be the genetic factors contributing to aerial root development. Moreover, the architectural and functional innovations that achieve fast gravitropism in the flowering plants appear to be lost in both terrestrial and epiphytic orchids, but are present in the early diverged orchid subfamilies. Taken together, our findings provide physiological and molecular evidence to support the notion that epiphytic orchids lack gravitropism and suggest diverse geotropic responses in the orchid family.
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Affiliation(s)
- Jhun-Chen Chen
- Biotechnology Center in Southern Taiwan, Academia Sinica, Tainan, Taiwan
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
| | - Hsiang-Yin Lin
- Biotechnology Center in Southern Taiwan, Academia Sinica, Tainan, Taiwan
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
| | - Ondřej Novák
- Laboratory of Growth Regulators, Institute of Experimental Botany of the Czech Academy of Science, Faculty of Science of Palacký University, Olomouc, Czech Republic
| | - Miroslav Strnad
- Laboratory of Growth Regulators, Institute of Experimental Botany of the Czech Academy of Science, Faculty of Science of Palacký University, Olomouc, Czech Republic
| | - Yung-I Lee
- Department of Life Science, National Taiwan University, Taipei, Taiwan
| | - Su-Chiung Fang
- Biotechnology Center in Southern Taiwan, Academia Sinica, Tainan, Taiwan
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
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2
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Cowling CL, Homayouni AL, Callwood JB, McReynolds MR, Khor J, Ke H, Draves MA, Dehesh K, Walley JW, Strader LC, Kelley DR. ZmPILS6 is an auxin efflux carrier required for maize root morphogenesis. Proc Natl Acad Sci U S A 2024; 121:e2313216121. [PMID: 38781209 PMCID: PMC11145266 DOI: 10.1073/pnas.2313216121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 03/25/2024] [Indexed: 05/25/2024] Open
Abstract
Plant root systems play a pivotal role in plant physiology and exhibit diverse phenotypic traits. Understanding the genetic mechanisms governing root growth and development in model plants like maize is crucial for enhancing crop resilience to drought and nutrient limitations. This study focused on identifying and characterizing ZmPILS6, an annotated auxin efflux carrier, as a key regulator of various crown root traits in maize. ZmPILS6-modified roots displayed reduced network area and suppressed lateral root formation, which are desirable traits for the "steep, cheap, and deep" ideotype. The research revealed that ZmPILS6 localizes to the endoplasmic reticulum and plays a vital role in controlling the spatial distribution of indole-3-acetic acid (IAA or "auxin") in primary roots. The study also demonstrated that ZmPILS6 can actively efflux IAA when expressed in yeast. Furthermore, the loss of ZmPILS6 resulted in significant proteome remodeling in maize roots, particularly affecting hormone signaling pathways. To identify potential interacting partners of ZmPILS6, a weighted gene coexpression analysis was performed. Altogether, this research contributes to the growing knowledge of essential genetic determinants governing maize root morphogenesis, which is crucial for guiding agricultural improvement strategies.
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Affiliation(s)
- Craig L. Cowling
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, IA50011
| | | | - Jodi B. Callwood
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, IA50011
| | - Maxwell R. McReynolds
- Department of Plant Pathology, Entomology and Microbiology, Iowa State University, Ames, IA50011
| | - Jasper Khor
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, IA50011
| | - Haiyan Ke
- Botany and Plant Sciences Department, University of California, Riverside, CA92521
| | - Melissa A. Draves
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, IA50011
| | - Katayoon Dehesh
- Botany and Plant Sciences Department, University of California, Riverside, CA92521
| | - Justin W. Walley
- Department of Plant Pathology, Entomology and Microbiology, Iowa State University, Ames, IA50011
| | | | - Dior R. Kelley
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, IA50011
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3
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Jan M, Muhammad S, Jin W, Zhong W, Zhang S, Lin Y, Zhou Y, Liu J, Liu H, Munir R, Yue Q, Afzal M, Wang G. Modulating root system architecture: cross-talk between auxin and phytohormones. FRONTIERS IN PLANT SCIENCE 2024; 15:1343928. [PMID: 38390293 PMCID: PMC10881875 DOI: 10.3389/fpls.2024.1343928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Accepted: 01/08/2024] [Indexed: 02/24/2024]
Abstract
Root architecture is an important agronomic trait that plays an essential role in water uptake, soil compactions, nutrient recycling, plant-microbe interactions, and hormone-mediated signaling pathways. Recently, significant advancements have been made in understanding how the complex interactions of phytohormones regulate the dynamic organization of root architecture in crops. Moreover, phytohormones, particularly auxin, act as internal regulators of root development in soil, starting from the early organogenesis to the formation of root hair (RH) through diverse signaling mechanisms. However, a considerable gap remains in understanding the hormonal cross-talk during various developmental stages of roots. This review examines the dynamic aspects of phytohormone signaling, cross-talk mechanisms, and the activation of transcription factors (TFs) throughout various developmental stages of the root life cycle. Understanding these developmental processes, together with hormonal signaling and molecular engineering in crops, can improve our knowledge of root development under various environmental conditions.
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Affiliation(s)
- Mehmood Jan
- College of Horticulture, South China Agricultural University, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Utilization and Conservation of Food and Medicinal Resources in Northern Region, Shaoguan University, Shaoguan, China
- College of Agriculture, South China Agricultural University, Guangzhou, Guangdong, China
| | - Sajid Muhammad
- Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China
| | - Weicai Jin
- College of Agriculture, South China Agricultural University, Guangzhou, Guangdong, China
- Heyuan Division of Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Heyuan, Guangdong, China
| | - Wenhao Zhong
- College of Agriculture, South China Agricultural University, Guangzhou, Guangdong, China
| | - Shaolong Zhang
- College of Horticulture, South China Agricultural University, Guangzhou, Guangdong, China
- Heyuan Division of Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Heyuan, Guangdong, China
| | - Yanjie Lin
- College of Agriculture, South China Agricultural University, Guangzhou, Guangdong, China
| | - Yueni Zhou
- College of Agriculture, South China Agricultural University, Guangzhou, Guangdong, China
| | - Jinlong Liu
- College of Agriculture, South China Agricultural University, Guangzhou, Guangdong, China
| | - Haifeng Liu
- College of Agriculture, South China Agricultural University, Guangzhou, Guangdong, China
- Heyuan Division of Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Heyuan, Guangdong, China
| | - Raheel Munir
- Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China
| | - Qiang Yue
- Guangdong Provincial Key Laboratory of Utilization and Conservation of Food and Medicinal Resources in Northern Region, Shaoguan University, Shaoguan, China
| | - Muhammad Afzal
- College of Horticulture, South China Agricultural University, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Utilization and Conservation of Food and Medicinal Resources in Northern Region, Shaoguan University, Shaoguan, China
- College of Agriculture, South China Agricultural University, Guangzhou, Guangdong, China
| | - Guoping Wang
- College of Horticulture, South China Agricultural University, Guangzhou, Guangdong, China
- Heyuan Division of Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Heyuan, Guangdong, China
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4
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Yadav A, Mathan J, Dubey AK, Singh A. The Emerging Role of Non-Coding RNAs (ncRNAs) in Plant Growth, Development, and Stress Response Signaling. Noncoding RNA 2024; 10:13. [PMID: 38392968 PMCID: PMC10893181 DOI: 10.3390/ncrna10010013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 02/05/2024] [Accepted: 02/06/2024] [Indexed: 02/25/2024] Open
Abstract
Plant species utilize a variety of regulatory mechanisms to ensure sustainable productivity. Within this intricate framework, numerous non-coding RNAs (ncRNAs) play a crucial regulatory role in plant biology, surpassing the essential functions of RNA molecules as messengers, ribosomal, and transfer RNAs. ncRNAs represent an emerging class of regulators, operating directly in the form of small interfering RNAs (siRNAs), microRNAs (miRNAs), long noncoding RNAs (lncRNAs), and circular RNAs (circRNAs). These ncRNAs exert control at various levels, including transcription, post-transcription, translation, and epigenetic. Furthermore, they interact with each other, contributing to a variety of biological processes and mechanisms associated with stress resilience. This review primarily concentrates on the recent advancements in plant ncRNAs, delineating their functions in growth and development across various organs such as root, leaf, seed/endosperm, and seed nutrient development. Additionally, this review broadens its scope by examining the role of ncRNAs in response to environmental stresses such as drought, salt, flood, heat, and cold in plants. This compilation offers updated information and insights to guide the characterization of the potential functions of ncRNAs in plant growth, development, and stress resilience in future research.
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Affiliation(s)
- Amit Yadav
- Department of Microbiology & Molecular Genetics, Michigan State University, East Lansing, MI 48824, USA;
| | - Jyotirmaya Mathan
- Sashi Bhusan Rath Government Autonomous Women’s College, Brahmapur 760001, India;
| | - Arvind Kumar Dubey
- Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE 68588, USA;
| | - Anuradha Singh
- Department of Plant, Soil and Microbial Science, Michigan State University, East Lansing, MI 48824, USA
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5
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Lindsay P, Swentowsky KW, Jackson D. Cultivating potential: Harnessing plant stem cells for agricultural crop improvement. MOLECULAR PLANT 2024; 17:50-74. [PMID: 38130059 DOI: 10.1016/j.molp.2023.12.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 12/14/2023] [Accepted: 12/18/2023] [Indexed: 12/23/2023]
Abstract
Meristems are stem cell-containing structures that produce all plant organs and are therefore important targets for crop improvement. Developmental regulators control the balance and rate of cell divisions within the meristem. Altering these regulators impacts meristem architecture and, as a consequence, plant form. In this review, we discuss genes involved in regulating the shoot apical meristem, inflorescence meristem, axillary meristem, root apical meristem, and vascular cambium in plants. We highlight several examples showing how crop breeders have manipulated developmental regulators to modify meristem growth and alter crop traits such as inflorescence size and branching patterns. Plant transformation techniques are another innovation related to plant meristem research because they make crop genome engineering possible. We discuss recent advances on plant transformation made possible by studying genes controlling meristem development. Finally, we conclude with discussions about how meristem research can contribute to crop improvement in the coming decades.
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Affiliation(s)
- Penelope Lindsay
- Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA
| | | | - David Jackson
- Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA; National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, China.
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6
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Cowling CL, Dash L, Kelley DR. Roles of auxin pathways in maize biology. JOURNAL OF EXPERIMENTAL BOTANY 2023; 74:6989-6999. [PMID: 37493143 PMCID: PMC10690729 DOI: 10.1093/jxb/erad297] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 07/24/2023] [Indexed: 07/27/2023]
Abstract
Phytohormones play a central role in plant development and environmental responses. Auxin is a classical hormone that is required for organ formation, tissue patterning, and defense responses. Auxin pathways have been extensively studied across numerous land plant lineages, including bryophytes and eudicots. In contrast, our understanding of the roles of auxin in maize morphogenesis and immune responses is limited. Here, we review evidence for auxin-mediated processes in maize and describe promising areas for future research in the auxin field. Several recent transcriptomic and genetic studies have demonstrated that auxin is a key influencer of both vegetative and reproductive development in maize (namely roots, leaves, and kernels). Auxin signaling has been implicated in both maize shoot architecture and immune responses through genetic and molecular analyses of the conserved co-repressor RAMOSA ENHANCER LOCUS2. Polar auxin transport is linked to maize drought responses, root growth, shoot formation, and leaf morphogenesis. Notably, maize has been a key system for delineating auxin biosynthetic pathways and offers many opportunities for future investigations on auxin metabolism. In addition, crosstalk between auxin and other phytohormones has been uncovered through gene expression studies and is important for leaf and root development in maize. Collectively these studies point to auxin as a cornerstone for maize biology that could be leveraged for improved crop resilience and yield.
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Affiliation(s)
- Craig L Cowling
- Department of Genetics, Development, and Cell Biology, Iowa State University, Ames, IA 50011, USA
| | - Linkan Dash
- Department of Genetics, Development, and Cell Biology, Iowa State University, Ames, IA 50011, USA
| | - Dior R Kelley
- Department of Genetics, Development, and Cell Biology, Iowa State University, Ames, IA 50011, USA
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7
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Li Q, Liu N, Wu C. Novel insights into maize (Zea mays) development and organogenesis for agricultural optimization. PLANTA 2023; 257:94. [PMID: 37031436 DOI: 10.1007/s00425-023-04126-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 03/22/2023] [Indexed: 06/19/2023]
Abstract
In maize, intrinsic hormone activities and sap fluxes facilitate organogenesis patterning and plant holistic development; these hormone movements should be a primary focus of developmental biology and agricultural optimization strategies. Maize (Zea mays) is an important crop plant with distinctive life history characteristics and structural features. Genetic studies have extended our knowledge of maize developmental processes, genetics, and molecular ecophysiology. In this review, the classical life cycle and life history strategies of maize are analyzed to identify spatiotemporal organogenesis properties and develop a definitive understanding of maize development. The actions of genes and hormones involved in maize organogenesis and sex determination, along with potential molecular mechanisms, are investigated, with findings suggesting central roles of auxin and cytokinins in regulating maize holistic development. Furthermore, investigation of morphological and structural characteristics of maize, particularly node ubiquity and the alternate attachment pattern of lateral organs, yields a novel regulatory model suggesting that maize organ initiation and subsequent development are derived from the stimulation and interaction of auxin and cytokinin fluxes. Propositions that hormone activities and sap flow pathways control organogenesis are thoroughly explored, and initiation and development processes of distinctive maize organs are discussed. Analysis of physiological factors driving hormone and sap movement implicates cues of whole-plant activity for hormone and sap fluxes to stimulate maize inflorescence initiation and organ identity determination. The physiological origins and biogenetic mechanisms underlying maize floral sex determination occurring at the tassel and ear spikelet are thoroughly investigated. The comprehensive outline of maize development and morphogenetic physiology developed in this review will enable farmers to optimize field management and will provide a reference for de novo crop domestication and germplasm improvement using genome editing biotechnologies, promoting agricultural optimization.
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Affiliation(s)
- Qinglin Li
- Crop Genesis and Novel Agronomy Center, Yangling, 712100, Shaanxi, China.
| | - Ning Liu
- Shandong ZhongnongTiantai Seed Co., Ltd, Pingyi, 273300, Shandong, China
| | - Chenglai Wu
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, 271018, Shandong, China.
- College of Agronomy, Shandong Agricultural University, Tai'an, 271018, Shandong, China.
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8
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Zhang M, Chen Y, Xing H, Ke W, Shi Y, Sui Z, Xu R, Gao L, Guo G, Li J, Xing J, Zhang Y. Positional cloning and characterization reveal the role of a miRNA precursor gene ZmLRT in the regulation of lateral root number and drought tolerance in maize. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2023; 65:772-790. [PMID: 36354146 DOI: 10.1111/jipb.13408] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 11/09/2022] [Indexed: 06/16/2023]
Abstract
Lateral roots play essential roles in drought tolerance in maize (Zea mays L.). However, the genetic basis for the variation in the number of lateral roots in maize remains elusive. Here, we identified a major quantitative trait locus (QTL), qLRT5-1, controlling lateral root number using a recombinant inbred population from a cross between the maize lines Zong3 (with many lateral roots) and 87-1 (with few lateral roots). Fine-mapping and functional analysis determined that the candidate gene for qLRT5-1, ZmLRT, expresses the primary transcript for the microRNA miR166a. ZmLRT was highly expressed in root tips and lateral root primordia, and knockout and overexpression of ZmLRT increased and decreased lateral root number, respectively. Compared with 87-1, the ZmLRT gene model of Zong3 lacked the second and third exons and contained a 14 bp deletion at the junction between the first exon and intron, which altered the splicing site. In addition, ZmLRT expression was significantly lower in Zong3 than in 87-1, which might be attributed to the insertions of a transposon and over large DNA fragments in the Zong3 ZmLRT promoter region. These mutations decreased the abundance of mature miR166a in Zong3, resulting in increased lateral roots at the seedling stage. Furthermore, miR166a post-transcriptionally repressed five development-related class-III homeodomain-leucine zipper genes. Moreover, knockout of ZmLRT enhanced drought tolerance of maize seedlings. Our study furthers our understanding of the genetic basis of lateral root number variation in maize and highlights ZmLRT as a target for improving drought tolerance in maize.
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Affiliation(s)
- Ming Zhang
- State Key Laboratory for Agrobiotechnology, Key Laboratory of Crop Heterosis and Utilization (MOE), Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing, 100193, China
| | - Yanhong Chen
- State Key Laboratory for Agrobiotechnology, Key Laboratory of Crop Heterosis and Utilization (MOE), Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing, 100193, China
- Agronomy College of Shandong Agricultural University, Taian, 271018, China
| | - Hongyan Xing
- State Key Laboratory for Agrobiotechnology, Key Laboratory of Crop Heterosis and Utilization (MOE), Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing, 100193, China
- Key Laboratory of Crop Germplasm Resources and Utilization (MARA), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Wensheng Ke
- State Key Laboratory for Agrobiotechnology, Key Laboratory of Crop Heterosis and Utilization (MOE), Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing, 100193, China
| | - Yunlu Shi
- Center for Crop Functional Genomics and Molecular Breeding, China Agricultural University, Beijing, 100193, China
| | - Zhipeng Sui
- State Key Laboratory for Agrobiotechnology, Key Laboratory of Crop Heterosis and Utilization (MOE), Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing, 100193, China
- Yantai Science and Technology Innovation Promotion Center, Yantai, 264003, China
| | - Ruibin Xu
- State Key Laboratory for Agrobiotechnology, Key Laboratory of Crop Heterosis and Utilization (MOE), Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing, 100193, China
- Beijing Key Laboratory of Maize DNA Fingerprinting and Molecular Breeding, Maize Research Institute, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Lulu Gao
- State Key Laboratory for Agrobiotechnology, Key Laboratory of Crop Heterosis and Utilization (MOE), Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing, 100193, China
| | - Ganggang Guo
- State Key Laboratory for Agrobiotechnology, Key Laboratory of Crop Heterosis and Utilization (MOE), Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing, 100193, China
- Key Laboratory of Crop Germplasm Resources and Utilization (MARA), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Jiansheng Li
- National Maize Improvement Center of China, China Agricultural University, Beijing, 100193, China
| | - Jiewen Xing
- State Key Laboratory for Agrobiotechnology, Key Laboratory of Crop Heterosis and Utilization (MOE), Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing, 100193, China
| | - Yirong Zhang
- State Key Laboratory for Agrobiotechnology, Key Laboratory of Crop Heterosis and Utilization (MOE), Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing, 100193, China
- National Maize Improvement Center of China, China Agricultural University, Beijing, 100193, China
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Baer M, Taramino G, Multani D, Sakai H, Jiao S, Fengler K, Hochholdinger F. Maize lateral rootless 1 encodes a homolog of the DCAF protein subunit of the CUL4-based E3 ubiquitin ligase complex. THE NEW PHYTOLOGIST 2023; 237:1204-1214. [PMID: 36345913 DOI: 10.1111/nph.18599] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 10/29/2022] [Indexed: 06/16/2023]
Abstract
In maize (Zea mays L.), lateral roots are formed in the differentiation zone of all root types in a multi-step process. The maize mutant lateral rootless 1 (lrt1) is defective in lateral root formation in primary and seminal roots but not in shoot-borne roots. We cloned the lrt1 gene by mapping in combination with BSA-seq and subsequent validation via CRISPR/Cas9. The lrt1 gene encodes a 209 kDa homolog of the DDB1-CUL4-ASSOCIATED FACTOR (DCAF) subunit of the CUL4-based E3 ubiquitin ligase (CRL4) complex localized in the nucleus. DDB1-CUL4-ASSOCIATED FACTOR proteins are encoded by an evolutionary old gene family already present in nonseed plants. They are adaptors that bind substrate proteins and promote their ubiquitylation, thus typically marking them for subsequent degradation in the 26S proteasome. Gene expression studies demonstrated that lrt1 transcripts are expressed preferentially in the meristematic zone of all root types of maize. Downregulation of the rum1 gene in lrt1 mutants suggests that lrt1 acts upstream of the lateral root regulator rum1. Our results demonstrate that DCAF proteins play a key role in root-type-specific lateral root formation in maize. Together with its role in nitrogen acquisition in nitrogen-poor soil, lrt1 could be a promising target for maize improvement.
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Affiliation(s)
- Marcel Baer
- Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, 53113, Bonn, Germany
| | | | | | | | | | | | - Frank Hochholdinger
- Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, 53113, Bonn, Germany
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10
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Fang D, Zhang W, Ye Z, Hu F, Cheng X, Cao J. The plant specific SHORT INTERNODES/STYLISH (SHI/STY) proteins: Structure and functions. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2023; 194:685-695. [PMID: 36565613 DOI: 10.1016/j.plaphy.2022.12.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 12/02/2022] [Accepted: 12/18/2022] [Indexed: 06/17/2023]
Abstract
Plant specific SHORT INTERNODES/STYLISH (SHI/STY) protein is a transcription factor involved in the formation and development of early lateral organs in plants. However, research on the SHI/STY protein family is not focused enough. In this article, we review recent studies on SHI/STY genes and explore the evolution and structure of SHI/STY. The biological functions of SHI/STYs are discussed in detail in this review, and the application of each biological function to modern agriculture is discussed. All SHI/STY proteins contain typical conserved RING-like zinc finger domain and IGGH domain. SHI/STYs are involved in the formation and development of lateral root, stem extension, leaf morphogenesis, and root nodule development. They are also involved in the regulation of pistil and stamen development and flowering time. At the same time, the regulation of some GA, JA, and auxin signals also involves these family proteins. For each aspect, unanswered or poorly understood questions were identified to help define future research areas. This review will provide a basis for further functional study of this gene family.
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Affiliation(s)
- Da Fang
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | - Weimeng Zhang
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | - Ziyi Ye
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | - Fei Hu
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | - Xiuzhu Cheng
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | - Jun Cao
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China.
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11
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Ma H, Li P, Xiao N, Xia T. Poly-γ-glutamic acid promoted maize root development by affecting auxin signaling pathway and the abundance and diversity of rhizosphere microbial community. BMC PLANT BIOLOGY 2022; 22:521. [PMID: 36352394 PMCID: PMC9647955 DOI: 10.1186/s12870-022-03908-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 10/25/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND The root systems of higher plants play an important role in plant growth and development. In our present study, it was found that poly-γ-glutamic acid (γ-PGA), an environmentally friendly biomacromolecule, significantly improved root development in maize. RESULTS After treatment with γ-PGA for 7 days, the fresh weight of maize roots was significantly increased and the differences between γ-PGA treated group and control group were mainly caused by the number (higher by 71.87% compared to the control) and length of lateral roots. RNAseq and RT-PCR analyses showed that γ-PGA treatment upregulated the expression of genes related to the synthesis of auxins and auxin signal in maize roots. In addition, γ-PGA promoted the accumulation of plant growth-promoting bacteria, such as Azospirillum, Azohydromonas, Ramlibacter, and Sphingobium (Proteobacteria), Streptomyces (Actinobacteria), Parasegetibacter (Bacteroidetes), and Gemmatimonas (Gemmatimonadetes) in rhizosphere soil and the secretion of auxins. The results of this study deepened our understanding of the effects and mechanism of γ-PGA on maize root development, and as well as highlighted the possibility of using γ-PGA to improve crop growth and soil environment. CONCLUSIONS γ-PGA promotes early growth and development of maize roots by inducing the secretion and accumulation of auxin in roots and in rhizosphere soil, and increasing the abundance of plant growth promoting bacteria.
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Affiliation(s)
- Haizhen Ma
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, PR China
- School of Bioengineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, Shandong, PR China
| | - Panpan Li
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, PR China
- School of Bioengineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, Shandong, PR China
| | - Ning Xiao
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, PR China
- School of Bioengineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, Shandong, PR China
| | - Tao Xia
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, PR China.
- School of Bioengineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, Shandong, PR China.
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12
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Zhang Y, Umeda M, Kakimoto T. Pericycle cell division competence underlies various developmental programs. PLANT BIOTECHNOLOGY (TOKYO, JAPAN) 2022; 39:29-36. [PMID: 35800961 PMCID: PMC9200087 DOI: 10.5511/plantbiotechnology.21.1202a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 12/02/2021] [Indexed: 05/08/2023]
Abstract
Pericycle cells possess proliferative activity long after leaving the root apical meristem. Depending on the developmental stage and external stimuli, pericycle cell division leads to the production of lateral roots, vascular cambium and periderm, and callus. Therefore, pericycle cell division competence underlies root branching and secondary growth, as well as plant regeneration capacity. In this review, we first briefly present an overview of the molecular pathways of the four developmental programs originated, exclusively or partly, from pericycle cells. Then, we provide a review of up-to-date knowledge in the mechanisms determining pericycle cells' competence to undergo cell division. Furthermore, we discuss directions of future research to further our understanding of the pericycle's characteristics and functions.
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Affiliation(s)
- Ye Zhang
- Graduate School of Science and Technology, Nara Institute of Science and Technology, Nara 630-0192, Japan
- E-mail: Tel: +81-743-72-5592 Fax: +81-743-72-5599
| | - Masaaki Umeda
- Graduate School of Science and Technology, Nara Institute of Science and Technology, Nara 630-0192, Japan
| | - Tatsuo Kakimoto
- Department of Biology, Graduate School of Science, Osaka University, Osaka 560-0043, Japan
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13
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G. Viana W, Scharwies JD, Dinneny JR. Deconstructing the root system of grasses through an exploration of development, anatomy and function. PLANT, CELL & ENVIRONMENT 2022; 45:602-619. [PMID: 35092025 PMCID: PMC9303260 DOI: 10.1111/pce.14270] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 01/26/2022] [Accepted: 01/27/2022] [Indexed: 05/16/2023]
Abstract
Well-adapted root systems allow plants to grow under resource-limiting environmental conditions and are important determinants of yield in agricultural systems. Important staple crops such as rice and maize belong to the family of grasses, which develop a complex root system that consists of an embryonic root system that emerges from the seed, and a postembryonic nodal root system that emerges from basal regions of the shoot after germination. While early seedling establishment is dependent on the embryonic root system, the nodal root system, and its associated branches, gains in importance as the plant matures and will ultimately constitute the bulk of below-ground growth. In this review, we aim to give an overview of the different root types that develop in cereal grass root systems, explore the different physiological roles they play by defining their anatomical features, and outline the genetic networks that control their development. Through this deconstructed view of grass root system function, we provide a parts-list of elements that function together in an integrated root system to promote survival and crop productivity.
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Affiliation(s)
| | | | - José R. Dinneny
- Department of BiologyStanford UniversityStanfordCaliforniaUSA
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14
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Bagautdinova ZZ, Omelyanchuk N, Tyapkin AV, Kovrizhnykh VV, Lavrekha VV, Zemlyanskaya EV. Salicylic Acid in Root Growth and Development. Int J Mol Sci 2022; 23:ijms23042228. [PMID: 35216343 PMCID: PMC8875895 DOI: 10.3390/ijms23042228] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 02/10/2022] [Accepted: 02/14/2022] [Indexed: 11/18/2022] Open
Abstract
In plants, salicylic acid (SA) is a hormone that mediates a plant’s defense against pathogens. SA also takes an active role in a plant’s response to various abiotic stresses, including chilling, drought, salinity, and heavy metals. In addition, in recent years, numerous studies have confirmed the important role of SA in plant morphogenesis. In this review, we summarize data on changes in root morphology following SA treatments under both normal and stress conditions. Finally, we provide evidence for the role of SA in maintaining the balance between stress responses and morphogenesis in plant development, and also for the presence of SA crosstalk with other plant hormones during this process.
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Affiliation(s)
- Zulfira Z. Bagautdinova
- Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (Z.Z.B.); (N.O.); (A.V.T.); (V.V.K.); (V.V.L.)
| | - Nadya Omelyanchuk
- Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (Z.Z.B.); (N.O.); (A.V.T.); (V.V.K.); (V.V.L.)
| | - Aleksandr V. Tyapkin
- Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (Z.Z.B.); (N.O.); (A.V.T.); (V.V.K.); (V.V.L.)
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Vasilina V. Kovrizhnykh
- Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (Z.Z.B.); (N.O.); (A.V.T.); (V.V.K.); (V.V.L.)
| | - Viktoriya V. Lavrekha
- Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (Z.Z.B.); (N.O.); (A.V.T.); (V.V.K.); (V.V.L.)
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Elena V. Zemlyanskaya
- Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (Z.Z.B.); (N.O.); (A.V.T.); (V.V.K.); (V.V.L.)
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
- Correspondence:
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15
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Kang BH, Anderson CT, Arimura SI, Bayer E, Bezanilla M, Botella MA, Brandizzi F, Burch-Smith TM, Chapman KD, Dünser K, Gu Y, Jaillais Y, Kirchhoff H, Otegui MS, Rosado A, Tang Y, Kleine-Vehn J, Wang P, Zolman BK. A glossary of plant cell structures: Current insights and future questions. THE PLANT CELL 2022; 34:10-52. [PMID: 34633455 PMCID: PMC8846186 DOI: 10.1093/plcell/koab247] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 09/29/2021] [Indexed: 05/03/2023]
Abstract
In this glossary of plant cell structures, we asked experts to summarize a present-day view of plant organelles and structures, including a discussion of outstanding questions. In the following short reviews, the authors discuss the complexities of the plant cell endomembrane system, exciting connections between organelles, novel insights into peroxisome structure and function, dynamics of mitochondria, and the mysteries that need to be unlocked from the plant cell wall. These discussions are focused through a lens of new microscopy techniques. Advanced imaging has uncovered unexpected shapes, dynamics, and intricate membrane formations. With a continued focus in the next decade, these imaging modalities coupled with functional studies are sure to begin to unravel mysteries of the plant cell.
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Affiliation(s)
- Byung-Ho Kang
- School of Life Sciences, Centre for Cell & Developmental Biology and State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Charles T Anderson
- Department of Biology and Center for Lignocellulose Structure and Formation, The Pennsylvania State University, University Park, Pennsylvania 16802 USA
| | - Shin-ichi Arimura
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo, Japan
| | - Emmanuelle Bayer
- Université de Bordeaux, CNRS, Laboratoire de Biogenèse Membranaire, UMR 5200, Villenave d'Ornon F-33140, France
| | - Magdalena Bezanilla
- Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755, USA
| | - Miguel A Botella
- Departamento de Biología Molecular y Bioquímica, Instituto de Hortifruticultura Subtropical y Mediterránea “La Mayora,” Universidad de Málaga-Consejo Superior de Investigaciones Científicas (IHSM-UMA-CSIC), Universidad de Málaga, Málaga 29071, Spain
| | - Federica Brandizzi
- MSU-DOE Plant Research Lab, Michigan State University, East Lansing, Michigan 48824 USA
- Department of Plant Biology, Michigan State University, East Lansing, Michigan 48824, USA
- Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, Michigan 48824, USA
| | - Tessa M Burch-Smith
- Department of Biochemistry & Cellular and Molecular Biology, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Kent D Chapman
- BioDiscovery Institute and Department of Biological Sciences, University of North Texas, Denton, Texas 76203, USA
| | - Kai Dünser
- Faculty of Biology, Chair of Molecular Plant Physiology (MoPP) University of Freiburg, Freiburg 79104, Germany
- Center for Integrative Biological Signalling Studies (CIBSS), University of Freiburg, Freiburg 79104, Germany
| | - Yangnan Gu
- Department of Plant and Microbial Biology, Innovative Genomics Institute, University of California, Berkeley, California 94720, USA
| | - Yvon Jaillais
- Laboratoire Reproduction et Développement des Plantes (RDP), Université de Lyon, ENS de Lyon, UCB Lyon 1, CNRS, INRAE, Lyon, France
| | - Helmut Kirchhoff
- Institute of Biological Chemistry, Washington State University, Pullman, Washington 99164, USA
| | - Marisa S Otegui
- Department of Botany and Center for Quantitative Cell Imaging, University of Wisconsin-Madison, Wisconsin 53706, USA
| | - Abel Rosado
- Department of Botany, University of British Columbia, Vancouver V6T1Z4, Canada
| | - Yu Tang
- Department of Plant and Microbial Biology, Innovative Genomics Institute, University of California, Berkeley, California 94720, USA
| | - Jürgen Kleine-Vehn
- Faculty of Biology, Chair of Molecular Plant Physiology (MoPP) University of Freiburg, Freiburg 79104, Germany
- Center for Integrative Biological Signalling Studies (CIBSS), University of Freiburg, Freiburg 79104, Germany
| | - Pengwei Wang
- Key Laboratory of Horticultural Plant Biology (MOE), College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China
| | - Bethany Karlin Zolman
- Department of Biology, University of Missouri, St. Louis, St. Louis, Missouri 63121, USA
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16
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van den Berg T, Yalamanchili K, de Gernier H, Santos Teixeira J, Beeckman T, Scheres B, Willemsen V, Ten Tusscher K. A reflux-and-growth mechanism explains oscillatory patterning of lateral root branching sites. Dev Cell 2021; 56:2176-2191.e10. [PMID: 34343477 DOI: 10.1016/j.devcel.2021.07.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 03/19/2021] [Accepted: 07/09/2021] [Indexed: 10/20/2022]
Abstract
Modular, repetitive structures are a key component of complex multicellular body plans across the tree of life. Typically, these structures are prepatterned by temporal oscillations in gene expression or signaling. Although a clock-and-wavefront mechanism was identified and plant leaf phyllotaxis arises from a Turing-type patterning for vertebrate somitogenesis and arthropod segmentation, the mechanism underlying lateral root patterning has remained elusive. To resolve this enigma, we combined computational modeling with in planta experiments. Intriguingly, auxin oscillations automatically emerge in our model from the interplay between a reflux-loop-generated auxin loading zone and stem-cell-driven growth dynamics generating periodic cell-size variations. In contrast to the clock-and-wavefront mechanism and Turing patterning, the uncovered mechanism predicts both frequency and spacing of lateral-root-forming sites to positively correlate with root meristem growth. We validate this prediction experimentally. Combined, our model and experimental results support that a reflux-and-growth patterning mechanism underlies lateral root priming.
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Affiliation(s)
- Thea van den Berg
- Computational Developmental Biology, Department of Biology, Utrecht University, Utrecht, the Netherlands
| | - Kavya Yalamanchili
- Laboratory of Molecular Biology, Department of Plant Sciences, Wageningen University, Wageningen, the Netherlands
| | - Hugues de Gernier
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium; VIB Center for Plant Systems Biology, Ghent, Belgium
| | - Joana Santos Teixeira
- Computational Developmental Biology, Department of Biology, Utrecht University, Utrecht, the Netherlands
| | - Tom Beeckman
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium; VIB Center for Plant Systems Biology, Ghent, Belgium
| | - Ben Scheres
- Laboratory of Molecular Biology, Department of Plant Sciences, Wageningen University, Wageningen, the Netherlands; Rijk Zwaan Breeding B.V., Department of Biotechnology, Eerste Kruisweg 9, 4793 RS Fijnaart, the Netherlands
| | - Viola Willemsen
- Laboratory of Molecular Biology, Department of Plant Sciences, Wageningen University, Wageningen, the Netherlands
| | - Kirsten Ten Tusscher
- Computational Developmental Biology, Department of Biology, Utrecht University, Utrecht, the Netherlands.
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17
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Yue K, Lingling L, Xie J, Coulter JA, Luo Z. Synthesis and regulation of auxin and abscisic acid in maize. PLANT SIGNALING & BEHAVIOR 2021; 16:1891756. [PMID: 34057034 PMCID: PMC8205056 DOI: 10.1080/15592324.2021.1891756] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Indole-3-acetic acid (IAA), the primary auxin in higher plants, and abscisic acid (ABA) play crucial roles in the ability of maize (Zea mays L.) to acclimatize to various environments by mediating growth, development, defense and nutrient allocation. Although understanding the biochemical reactions for IAA and ABA biosynthesis and signal transduction has progressed, the mechanisms by which auxin and ABA are synthesized and transduced in maize have not been fully elucidated to date. The synthesis and signal transduction pathway of IAA and ABA in maize can be analyzed using an existing model. This article focuses on the research progress toward understanding the synthesis and signaling pathways of IAA and ABA, as well as IAA and ABA regulation of maize growth, providing insight for future development and the significance of IAA and ABA for maize improvement.
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Affiliation(s)
- Kai Yue
- Gansu Provincial Key Laboratory of Aridland Crop Science, Lanzhou, China
- College of Agronomy, Gansu Agricultural University, Lanzhou, China
| | - Li Lingling
- Gansu Provincial Key Laboratory of Aridland Crop Science, Lanzhou, China
- College of Agronomy, Gansu Agricultural University, Lanzhou, China
- CONTACT Lingling Li College of Agronomy/Gansu Provincial Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China
| | - Junhong Xie
- Gansu Provincial Key Laboratory of Aridland Crop Science, Lanzhou, China
- College of Agronomy, Gansu Agricultural University, Lanzhou, China
| | - Jeffrey A. Coulter
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, USA
| | - Zhuzhu Luo
- College of Resource and Environment, Gansu Agricultural University, Lanzhou, China
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18
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Sharma M, Singh D, Saksena HB, Sharma M, Tiwari A, Awasthi P, Botta HK, Shukla BN, Laxmi A. Understanding the Intricate Web of Phytohormone Signalling in Modulating Root System Architecture. Int J Mol Sci 2021; 22:ijms22115508. [PMID: 34073675 PMCID: PMC8197090 DOI: 10.3390/ijms22115508] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 05/11/2021] [Accepted: 05/13/2021] [Indexed: 12/12/2022] Open
Abstract
Root system architecture (RSA) is an important developmental and agronomic trait that is regulated by various physical factors such as nutrients, water, microbes, gravity, and soil compaction as well as hormone-mediated pathways. Phytohormones act as internal mediators between soil and RSA to influence various events of root development, starting from organogenesis to the formation of higher order lateral roots (LRs) through diverse mechanisms. Apart from interaction with the external cues, root development also relies on the complex web of interaction among phytohormones to exhibit synergistic or antagonistic effects to improve crop performance. However, there are considerable gaps in understanding the interaction of these hormonal networks during various aspects of root development. In this review, we elucidate the role of different hormones to modulate a common phenotypic output, such as RSA in Arabidopsis and crop plants, and discuss future perspectives to channel vast information on root development to modulate RSA components.
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19
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Yang J, Zhang G, An J, Li Q, Chen Y, Zhao X, Wu J, Wang Y, Hao Q, Wang W, Wang W. Expansin gene TaEXPA2 positively regulates drought tolerance in transgenic wheat (Triticum aestivum L.). PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2020; 298:110596. [PMID: 32771153 DOI: 10.1016/j.plantsci.2020.110596] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 07/03/2020] [Accepted: 07/05/2020] [Indexed: 05/08/2023]
Abstract
Expansins loosen plant cell walls and are involved in cell enlargement and various abiotic stresses. In previous studies, we cloned the expansin gene TaEXPA2 from the wheat cultivar HF9703. Here, we studied its function and regulation in wheat drought stress tolerance. The results indicated that TaEXPA2-overexpressing wheat plants (OE) exhibited drought tolerant phenotypes, whereas down-regulation of TaEXPA2 by RNA interference (RNAi) resulted in elevated drought sensitivity, as measured by survival rate, photosynthetic rate and water containing ability under drought stress. Overexpression of TaEXPA2 enhanced the antioxidant capacity in wheat plants, via elevation of antioxidant enzyme activity and the increase of the transcripts of some ROS scavenging enzyme-related genes. Further investigation revealed that TaEXPA2 positively influenced lateral root formation under drought conditions. A MYB transcription factor of wheat named TaMPS activates TaEXPA2 expression directly by binding to its promoter. Overexpression of TaMPS in Arabidopsis conferred drought tolerance associated with improved lateral root number, and the close homolog genes of TaEXPA2 were up-regulated in Arabidopsis roots overexpressing TaMPS, which suggest that TaMPS may function as one of the regulator of TaEXPA2 gene expression in the root lateral development under drought stress. These findings suggest that TaEXPA2 positively regulates drought stress tolerance in wheat.
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Affiliation(s)
- Junjiao Yang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, Shandong, China
| | - Guangqiang Zhang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, Shandong, China
| | - Jie An
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, Shandong, China
| | - Qinxue Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, Shandong, China
| | - Yanhui Chen
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, Shandong, China; Research Institute of Pomology of Chinese Academy of Agricultural Sciences, Xingcheng 125100, Liaoning, China
| | - Xiaoyu Zhao
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, Shandong, China
| | - Jiajie Wu
- State Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, Tai'an 271018, Shandong, China
| | - Yong Wang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, Shandong, China
| | - Qunqun Hao
- College of Life Sciences, Zaozhuang University, Zaozhuang 277160, Shandong, China
| | - Wenqiang Wang
- College of Life Sciences, Zaozhuang University, Zaozhuang 277160, Shandong, China.
| | - Wei Wang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, Shandong, China.
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20
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Wang X, Feng J, White PJ, Shen J, Cheng L. Heterogeneous phosphate supply influences maize lateral root proliferation by regulating auxin redistribution. ANNALS OF BOTANY 2020; 125:119-130. [PMID: 31560368 PMCID: PMC6948210 DOI: 10.1093/aob/mcz154] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 07/16/2019] [Accepted: 09/20/2019] [Indexed: 05/16/2023]
Abstract
BACKGROUND AND AIMS Roots take up phosphorus (P) as inorganic phosphate (Pi). Enhanced root proliferation in Pi-rich patches enables plants to capture the unevenly distributed Pi, but the underlying control of root proliferation remains largely unknown. Here, the role of auxin in this response was investigated in maize (Zea mays). METHODS A split-root, hydroponics system was employed to investigate root responses to Pi supply, with one (heterogeneous) or both (homogeneous) sides receiving 0 or 500 μm Pi. KEY RESULTS Maize roots proliferated in Pi-rich media, particularly with heterogeneous Pi supply. The second-order lateral root number was 3-fold greater in roots of plants receiving a heterogeneous Pi supply than in roots of plants with a homogeneous Pi supply. Root proliferation in a heterogeneous Pi supply was inhibited by the auxin transporter inhibitor 1-N-naphthylphthalamic acid (NPA). The proliferation of lateral roots was accompanied by an enhanced auxin response in the apical meristem and vascular tissues at the root tip, as demonstrated in a DR5::RFP marker line. CONCLUSIONS It is concluded that the response of maize root morphology to a heterogeneous Pi supply is modulated by local signals of Pi availability and systemic signals of plant P nutritional status, and is mediated by auxin redistribution.
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Affiliation(s)
- Xin Wang
- Department of Plant Nutrition, China Agricultural University, Key Laboratory of Plant-Soil Interactions, Ministry of Education, Key Laboratory of Plant Nutrition, Ministry of Agriculture, Beijing , P. R. China
| | - Jingjing Feng
- Department of Plant Nutrition, China Agricultural University, Key Laboratory of Plant-Soil Interactions, Ministry of Education, Key Laboratory of Plant Nutrition, Ministry of Agriculture, Beijing , P. R. China
| | - Philip J White
- Ecological Science Group, The James Hutton Institute, Invergowrie, Dundee DD2 5DA, UK
| | - Jianbo Shen
- Department of Plant Nutrition, China Agricultural University, Key Laboratory of Plant-Soil Interactions, Ministry of Education, Key Laboratory of Plant Nutrition, Ministry of Agriculture, Beijing , P. R. China
| | - Lingyun Cheng
- Department of Plant Nutrition, China Agricultural University, Key Laboratory of Plant-Soil Interactions, Ministry of Education, Key Laboratory of Plant Nutrition, Ministry of Agriculture, Beijing , P. R. China
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21
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Xie Y, Wang J, Zheng L, Wang Y, Luo L, Ma M, Zhang C, Han Y, Beeckman T, Xu G, Cai Q, Xuan W. Cadmium stress suppresses lateral root formation by interfering with the root clock. PLANT, CELL & ENVIRONMENT 2019; 42:3182-3196. [PMID: 31369162 DOI: 10.1111/pce.13635] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Revised: 07/22/2019] [Accepted: 07/26/2019] [Indexed: 06/10/2023]
Abstract
A biological clock activated by oscillating signals, known as root clock, has been linked to lateral root (LR) formation and is essential for regular LR spacing along the primary root. However, it remains unclear how this internal mechanism is influenced by environmental factors known to affect the LR pattern. Here, we report that excessive cadmium (Cd) inhibits LR formation by disrupting the lateral root cap (LRC)-programmed cell death (PCD)-regulated root clock. Cd restricts the frequency of the oscillating signal rather than its amplitude. This could be attributed to the inhibition on meristematic activity by Cd, which resulted in decreased LRC cell number and LRC-PCD frequency. Genetic evidence further showed that LRC cell number is positively correlated with root resistance to Cd. Our study reveals root cap dynamics as a novel mechanism mediating root responses to Cd, providing insight into the signalling pathways of the root clock responding to environmental cues.
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Affiliation(s)
- Yuanming Xie
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, China
| | - Jiahui Wang
- College of Life Science, Nanjing Agricultural University, Nanjing, 210095, China
| | - Lulu Zheng
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, China
| | - Yu Wang
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Long Luo
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, China
| | - Mingyue Ma
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Chi Zhang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, China
| | - Yi Han
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Tom Beeckman
- Department of Plant Biotechnology and Bioinformatics, Ghent University, B-9052, Ghent, Belgium
- VIB-UGent Center for Plant Systems Biology, B-9052, Ghent, Belgium
| | - Guohua Xu
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, China
| | - Qingsheng Cai
- College of Life Science, Nanjing Agricultural University, Nanjing, 210095, China
| | - Wei Xuan
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, China
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Corona-Sánchez I, Peña-Uribe CA, González-López O, Villegas J, Campos-Garcia J, Reyes de la Cruz H. Cyclodipeptides from Pseudomonas aeruginosa modulate the maize ( Zea mays L.) root system and promote S6 ribosomal protein kinase activation. PeerJ 2019; 7:e7494. [PMID: 31523498 PMCID: PMC6717507 DOI: 10.7717/peerj.7494] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Accepted: 07/16/2019] [Indexed: 12/15/2022] Open
Abstract
Background Pseudomonas aeruginosa is an opportunistic and pathogenic bacterium with the ability to produce cyclodipeptides (CDPs), which belong to a large family of molecules with important biological activities. Excessive amounts of CDPs produced by Pseudomonas strains can activate an auxin response in Arabidopsis thaliana and promote plant growth. Target of rapamycin (TOR) is an evolutionarily conserved eukaryotic protein kinase that coordinates cell growth and metabolic processes in response to environmental and nutritional signals. Target of rapamycin kinase phosphorylates various substrates, of which S6 ribosomal protein kinase (S6K) is particularly well known. The PI3K/Akt/mTOR/S6K signaling pathway has been studied extensively in mammals because of its association with fundamental biological processes including cell differentiation. However, evidences suggest that this pathway also has specific and conserved functions in plants and may thus be conserved, as are several of its components like TOR complex 1 and S6K proteins. In plants, TOR-S6K signaling has been shown to be modulated in response to plant growth promoters or stressors. Methods In this study, we evaluated the effects of P. aeruginosa CDPs on the growth and root development of maize plants (Zea mays L.) by adding different CDPs concentrations on culture plant media, as well as the effect on the phosphorylation of the maize S6K protein (ZmS6K) by protein electrophoresis and western blot. Results Our results showed that P. aeruginosa CDPs promoted maize growth and development, including modifications in the root system architecture, correlating with the increased ZmS6K phosphorylation and changes induced in electrophoretic mobility, suggesting post-translational modifications on ZmS6K. These findings suggest that the plant growth-promoting effect of the Pseudomonas genus, associated with the CDPs production, involves the TOR/S6K signaling pathway as a mechanism of plant growth and root development in plant–microorganism interaction.
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Affiliation(s)
- Iván Corona-Sánchez
- Instituto de Investigaciones Químico Biológicas, Laboratorio de Biotecnología Molecular de Plantas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, México
| | - Cesar Arturo Peña-Uribe
- Instituto de Investigaciones Químico Biológicas, Laboratorio de Biotecnología Molecular de Plantas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, México
| | - Omar González-López
- Instituto de Investigaciones Químico Biológicas, Laboratorio de Biotecnología Molecular de Plantas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, México.,Instituto de Investigaciones Químico Biológicas, Laboratorio de Biotecnología Microbiana, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, México
| | - Javier Villegas
- Instituto de Investigaciones Químico Biológicas, Laboratorio de Agroecología, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, México
| | - Jesus Campos-Garcia
- Instituto de Investigaciones Químico Biológicas, Laboratorio de Biotecnología Microbiana, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, México
| | - Homero Reyes de la Cruz
- Instituto de Investigaciones Químico Biológicas, Laboratorio de Biotecnología Molecular de Plantas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, México
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Trevisan S, Trentin AR, Ghisi R, Masi A, Quaggiotti S. Nitrate affects transcriptional regulation of UPBEAT1 and ROS localisation in roots of Zea mays L. PHYSIOLOGIA PLANTARUM 2019; 166:794-811. [PMID: 30238472 DOI: 10.1111/ppl.12839] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 08/23/2018] [Accepted: 09/13/2018] [Indexed: 06/08/2023]
Abstract
Nitrogen (N) is an indispensable nutrient for crops but its availability in agricultural soils is subject to considerable fluctuation. Plants have developed plastic responses to external N fluctuations in order to optimise their development. The coordinated action of nitric oxide and auxin seems to allow the cells of the root apex transition zone (TZ) of N-deprived maize to rapidly sense nitrate (NO3 - ). Preliminary results support the hypothesis that reactive oxygen species (ROS) signalling might also have a role in this pathway, probably through a putative maize orthologue of UPBEAT1 (UPB1). To expand on this hypothesis and better understand the different roles played by different root portions, we investigated the dynamics of ROS production, and the molecular and biochemical regulation of the main components of ROS production and scavenging in tissues of the meristem, transition zone, elongation zone and maturation zone of maize roots. The results suggest that the inverse regulation of ZmUPB1 and ZmPRX112 transcription observed in cells of the TZ in response to nitrogen depletion or NO3 - supply affects the balance between superoxide (O2 •- ) and hydrogen peroxide (H2 O2 ) in the root apex and consequently triggers differential root growth. This explanation is supported by additional results on the overall metabolic and transcriptional regulation of ROS homeostasis.
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Affiliation(s)
- Sara Trevisan
- Department of Agriculture, Food, Natural Resources, Animals and the Environment, University of Padua, 35020, Legnaro, Padua, Italy
| | - Anna R Trentin
- Department of Agriculture, Food, Natural Resources, Animals and the Environment, University of Padua, 35020, Legnaro, Padua, Italy
| | - Rossella Ghisi
- Department of Agriculture, Food, Natural Resources, Animals and the Environment, University of Padua, 35020, Legnaro, Padua, Italy
| | - Antonio Masi
- Department of Agriculture, Food, Natural Resources, Animals and the Environment, University of Padua, 35020, Legnaro, Padua, Italy
| | - Silvia Quaggiotti
- Department of Agriculture, Food, Natural Resources, Animals and the Environment, University of Padua, 35020, Legnaro, Padua, Italy
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Torres-Martínez HH, Rodríguez-Alonso G, Shishkova S, Dubrovsky JG. Lateral Root Primordium Morphogenesis in Angiosperms. FRONTIERS IN PLANT SCIENCE 2019; 10:206. [PMID: 30941149 PMCID: PMC6433717 DOI: 10.3389/fpls.2019.00206] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 02/07/2019] [Indexed: 05/14/2023]
Abstract
Morphogenetic processes are the basis of new organ formation. Lateral roots (LRs) are the building blocks of the root system. After LR initiation and before LR emergence, a new lateral root primordium (LRP) forms. During this period, the organization and functionality of the prospective LR is defined. Thus, proper LRP morphogenesis is a decisive process during root system formation. Most current studies on LRP morphogenesis have been performed in the model species Arabidopsis thaliana; little is known about this process in other angiosperms. To understand LRP morphogenesis from a wider perspective, we review both contemporary and earlier studies. The latter are largely forgotten, and we attempted to integrate them into present-day research. In particular, we consider in detail the participation of parent root tissue in LRP formation, cell proliferation and timing during LRP morphogenesis, and the hormonal and genetic regulation of LRP morphogenesis. Cell type identity acquisition and new stem cell establishement during LRP morphogenesis are also considered. Within each of these facets, unanswered or poorly understood questions are identified to help define future research in the field. Finally, we discuss emerging research avenues and new technologies that could be used to answer the remaining questions in studies of LRP morphogenesis.
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Affiliation(s)
| | | | | | - Joseph G. Dubrovsky
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Mexico
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25
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Di Mambro R, Svolacchia N, Dello Ioio R, Pierdonati E, Salvi E, Pedrazzini E, Vitale A, Perilli S, Sozzani R, Benfey PN, Busch W, Costantino P, Sabatini S. The Lateral Root Cap Acts as an Auxin Sink that Controls Meristem Size. Curr Biol 2019; 29:1199-1205.e4. [PMID: 30880016 DOI: 10.1016/j.cub.2019.02.022] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 12/27/2018] [Accepted: 02/06/2019] [Indexed: 12/28/2022]
Abstract
Plant developmental plasticity relies on the activities of meristems, regions where stem cells continuously produce new cells [1]. The lateral root cap (LRC) is the outermost tissue of the root meristem [1], and it is known to play an important role during root development [2-6]. In particular, it has been shown that mechanical or genetic ablation of LRC cells affect meristem size [7, 8]; however, the molecular mechanisms involved are unknown. Root meristem size and, consequently, root growth depend on the position of the transition zone (TZ), a boundary that separates dividing from differentiating cells [9, 10]. The interaction of two phytohormones, cytokinin and auxin, is fundamental in controlling the position of the TZ [9, 10]. Cytokinin via the ARABIDOPSIS RESPONSE REGULATOR 1 (ARR1) control auxin distribution within the meristem, generating an instructive auxin minimum that positions the TZ [10]. We identify a cytokinin-dependent molecular mechanism that acts in the LRC to control the position of the TZ and meristem size. We show that auxin levels within the LRC cells depends on PIN-FORMED 5 (PIN5), a cytokinin-activated intracellular transporter that pumps auxin from the cytoplasm into the endoplasmic reticulum, and on irreversible auxin conjugation mediated by the IAA-amino synthase GRETCHEN HAGEN 3.17 (GH3.17). By titrating auxin in the LRC, the PIN5 and the GH3.17 genes control auxin levels in the entire root meristem. Overall, our results indicate that the LRC serves as an auxin sink that, under the control of cytokinin, regulates meristem size and root growth.
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Affiliation(s)
- Riccardo Di Mambro
- Department of Biology, University of Pisa - via L. Ghini, 13 - 56126 Pisa, Italy.
| | - Noemi Svolacchia
- Dipartimento di Biologia e Biotecnologie, Laboratory of Functional Genomics and Proteomics of Model Systems, Università di Roma, Sapienza - via dei Sardi, 70 - 00185 Rome, Italy
| | - Raffaele Dello Ioio
- Dipartimento di Biologia e Biotecnologie, Laboratory of Functional Genomics and Proteomics of Model Systems, Università di Roma, Sapienza - via dei Sardi, 70 - 00185 Rome, Italy
| | - Emanuela Pierdonati
- Dipartimento di Biologia e Biotecnologie, Laboratory of Functional Genomics and Proteomics of Model Systems, Università di Roma, Sapienza - via dei Sardi, 70 - 00185 Rome, Italy
| | - Elena Salvi
- Dipartimento di Biologia e Biotecnologie, Laboratory of Functional Genomics and Proteomics of Model Systems, Università di Roma, Sapienza - via dei Sardi, 70 - 00185 Rome, Italy
| | - Emanuela Pedrazzini
- Istituto di Biologia e Biotecnologia Agraria, Consiglio Nazionale delle Ricerche - Via Alfonso Corti, 12 - 20133 Milano, Italy
| | - Alessandro Vitale
- Istituto di Biologia e Biotecnologia Agraria, Consiglio Nazionale delle Ricerche - Via Alfonso Corti, 12 - 20133 Milano, Italy
| | - Serena Perilli
- Dipartimento di Biologia e Biotecnologie, Laboratory of Functional Genomics and Proteomics of Model Systems, Università di Roma, Sapienza - via dei Sardi, 70 - 00185 Rome, Italy
| | - Rosangela Sozzani
- Department of Plant and Microbial Biology, North Carolina State University, Raleigh, NC, United States
| | - Philip N Benfey
- Department of Biology and Howard Hughes Medical Institute, Duke University, Durham, NC 27708, USA
| | - Wolfgang Busch
- Plant Molecular and Cellular Biology Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - Paolo Costantino
- Dipartimento di Biologia e Biotecnologie, Laboratory of Functional Genomics and Proteomics of Model Systems, Università di Roma, Sapienza - via dei Sardi, 70 - 00185 Rome, Italy
| | - Sabrina Sabatini
- Dipartimento di Biologia e Biotecnologie, Laboratory of Functional Genomics and Proteomics of Model Systems, Università di Roma, Sapienza - via dei Sardi, 70 - 00185 Rome, Italy.
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Buendia L, Maillet F, O'Connor D, van de-Kerkhove Q, Danoun S, Gough C, Lefebvre B, Bensmihen S. Lipo-chitooligosaccharides promote lateral root formation and modify auxin homeostasis in Brachypodium distachyon. THE NEW PHYTOLOGIST 2019; 221:2190-2202. [PMID: 30347445 DOI: 10.1111/nph.15551] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 10/12/2018] [Indexed: 05/25/2023]
Abstract
Lipo-chitooligosaccharides (LCOs) are microbial symbiotic signals that also influence root growth. In Medicago truncatula, LCOs stimulate lateral root formation (LRF) synergistically with auxin. However, the molecular mechanisms of this phenomenon and whether it is restricted to legume plants are not known. We have addressed the capacity of the model monocot Brachypodium distachyon (Brachypodium) to respond to LCOs and auxin for LRF. For this, we used a combination of root phenotyping assays, live-imaging and auxin quantification, and analysed the regulation of auxin homeostasis genes. We show that LCOs and a low dose of the auxin precursor indole-3-butyric acid (IBA) stimulated LRF in Brachypodium, while a combination of LCOs and IBA led to different regulations. Both LCO and IBA treatments locally increased endogenous indole-3-acetic acid (IAA) content, whereas the combination of LCO and IBA locally increased the endogenous concentration of a conjugated form of IAA (IAA-Ala). LCOs, IBA and the combination differentially controlled expression of auxin homeostasis genes. These results demonstrate that LCOs are active on Brachypodium roots and stimulate LRF probably through regulation of auxin homeostasis. The interaction between LCO and auxin treatments observed in Brachypodium on root architecture opens interesting avenues regarding their possible combined effects during the arbuscular mycorrhizal symbiosis.
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Affiliation(s)
- Luis Buendia
- LIPM, Université de Toulouse, INRA, CNRS, 31326, Castanet-Tolosan, France
| | - Fabienne Maillet
- LIPM, Université de Toulouse, INRA, CNRS, 31326, Castanet-Tolosan, France
| | - Devin O'Connor
- Sainsbury Laboratory, Cambridge University, 47 Bateman Street, Cambridge, CB2 1LR, UK
| | | | - Saida Danoun
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, UPS, CNRS, 24 chemin de Borde Rouge-Auzeville, 31326, Castanet-Tolosan, France
| | - Clare Gough
- LIPM, Université de Toulouse, INRA, CNRS, 31326, Castanet-Tolosan, France
| | - Benoit Lefebvre
- LIPM, Université de Toulouse, INRA, CNRS, 31326, Castanet-Tolosan, France
| | - Sandra Bensmihen
- LIPM, Université de Toulouse, INRA, CNRS, 31326, Castanet-Tolosan, France
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27
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Chiatante D, Rost T, Bryant J, Scippa GS. Regulatory networks controlling the development of the root system and the formation of lateral roots: a comparative analysis of the roles of pericycle and vascular cambium. ANNALS OF BOTANY 2018; 122:697-710. [PMID: 29394314 PMCID: PMC6215048 DOI: 10.1093/aob/mcy003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Accepted: 01/08/2018] [Indexed: 05/07/2023]
Abstract
Background The production of a new lateral root from parental root primary tissues has been investigated extensively, and the most important regulatory mechanisms are now well known. A first regulatory mechanism is based on the synthesis of small peptides which interact ectopically with membrane receptors to elicit a modulation of transcription factor target genes. A second mechanism involves a complex cross-talk between plant hormones. It is known that lateral roots are formed even in parental root portions characterized by the presence of secondary tissues, but there is not yet agreement about the putative tissue source providing the cells competent to become founder cells of a new root primordium. Scope We suggest models of possible regulatory mechanisms for inducing specific root vascular cambium (VC) stem cells to abandon their activity in the production of xylem and phloem elements and to start instead the construction of a new lateral root primordium. Considering the ontogenic nature of the VC, the models which we suggest are the result of a comparative review of mechanisms known to control the activity of stem cells in the root apical meristem, procambium and VC. Stem cells in the root meristems can inherit various competences to play different roles, and their fate could be decided in response to cross-talk between endogenous and exogenous signals. Conclusions We have found a high degree of relatedness among the regulatory mechanisms controlling the various root meristems. This fact suggests that competence to form new lateral roots can be inherited by some stem cells of the VC lineage. This kind of competence could be represented by a sensitivity of specific stem cells to factors such as those presented in our models.
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Affiliation(s)
- Donato Chiatante
- Dipartimento di Biotecnologie e Scienze della Vita, University of Insubria, Varese, Italy
| | - Thomas Rost
- Department of Plant Biology, College of Biological Sciences, University of California, Davis, CA, USA
| | - John Bryant
- Biosciences, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
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28
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Chen L, Cai Y, Liu X, Guo C, Yao W, Sun S, Wu C, Jiang B, Han T, Hou W. GmGRP-like gene confers Al tolerance in Arabidopsis. Sci Rep 2018; 8:13601. [PMID: 30206281 PMCID: PMC6134052 DOI: 10.1038/s41598-018-31703-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Accepted: 08/23/2018] [Indexed: 11/09/2022] Open
Abstract
Aluminium (Al) toxicity restrains water and nutrient uptake and is toxic to plant roots, ultimately inhibiting crop production. Here, we isolated and characterized a soybean glycine-rich protein-like gene (GmGRPL) that is mainly expressed in the root and that is regulated by Al treatment. Overexpression of GmGRPL can alleviate Al-induced root growth inhibition in Arabidopsis. The levels of IAA and ethylene in GmGRPL-overexpressing hairy roots were lower than those in control and RNA interference-exposed GmGRPL hairy roots with or without Al stress, which were mainly regulated by TAA1 and ACO, respectively. In transgenic soybean hairy roots, the MDA, H2O2 and O2-·content in GmGRPL-overexpressing hairy roots were less than that in control and RNA interference-exposed GmGRPL hairy roots under Al stress. In addition, IAA and ACC can enhance the expression level of the GmGRPL promoter with or without Al stress. These results indicated that GmGRPL can alleviate Al-induced root growth inhibition by regulating the level of IAA and ethylene and improving antioxidant activity.
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Affiliation(s)
- Li Chen
- National Center for Transgenic Research in Plants, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
- Ministry of Agriculture Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Yupeng Cai
- National Center for Transgenic Research in Plants, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
- Ministry of Agriculture Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Xiujie Liu
- National Center for Transgenic Research in Plants, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
- Ministry of Agriculture Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Chen Guo
- National Center for Transgenic Research in Plants, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
- Ministry of Agriculture Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Weiwei Yao
- National Center for Transgenic Research in Plants, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
- Ministry of Agriculture Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Shi Sun
- Ministry of Agriculture Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Cunxiang Wu
- Ministry of Agriculture Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Bingjun Jiang
- Ministry of Agriculture Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Tianfu Han
- Ministry of Agriculture Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Wensheng Hou
- National Center for Transgenic Research in Plants, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
- Ministry of Agriculture Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
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29
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Chen Y, Xie Y, Song C, Zheng L, Rong X, Jia L, Luo L, Zhang C, Qu X, Xuan W. A comparison of lateral root patterning among dicot and monocot plants. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2018; 274:201-211. [PMID: 30080605 DOI: 10.1016/j.plantsci.2018.05.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 04/18/2018] [Accepted: 05/21/2018] [Indexed: 05/22/2023]
Abstract
Lateral root branching along the primary root involves complex gene regulatory networks in model plant Arabidopsis. However, it is largely unclarified whether different plant species share a common mechanism to pattern the lateral root along the primary axis. In this study, we assessed the development pattern of lateral root among several dicot and monocot plants, including Arabidopsis, tomato, Medicago, Nicotiana, rice, and ryegrass by using an agar-gel culture system. Our results reveal a regular-spaced distribution pattern of lateral roots along the primary root axis of both dicot and monocot plants. Meanwhile, the root patterning is tightly controlled by root bending and the plant hormone auxin. However, nitrogen and phosphate starvations trigger distinguished root growth patterns among different plant species. Our studies strongly suggest a partially shared signaling pathway underlying root patterning of various plant species, and also provide a foundation for further identification of genes associated with root development.
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Affiliation(s)
- Yuqin Chen
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Yuanming Xie
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Caihong Song
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Lulu Zheng
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Xiong Rong
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Letian Jia
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Long Luo
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Chi Zhang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Xiaoxiao Qu
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Wei Xuan
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China.
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30
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Singh N, Bhatla SC. Nitric oxide regulates lateral root formation through modulation of ACC oxidase activity in sunflower seedlings under salt stress. PLANT SIGNALING & BEHAVIOR 2018; 13:e1473683. [PMID: 29939832 PMCID: PMC6103280 DOI: 10.1080/15592324.2018.1473683] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 05/02/2018] [Indexed: 05/21/2023]
Abstract
Nitric oxide (NO) is established as a modulator of various developmental processes in plants through its interaction with multiple enzymatic and non-enzymatic biomolecules. Lateral root (LR) induction and extension in sunflower (Helianthus annuus L.) has been observed to be governed by a probable crosstalk between NO and ethylene biosynthesizing enzyme-ACC oxidase. NaCl (120 mM) stress not only lowers LR induction but also reduces their extension growth. Quenching of endogenous NO by raising seedlings in presence of 40 µM hemoglobin in the growth medium does not affect LR induction but lowers their extension growth. NaCl stress and NO depletion have additive effects on the enhancement of ACC oxidase activity, leading to enhanced ethylene biosynthesis. Role of NO has been further confirmed by raising sunflower seedlings in the presence of 20-60 µM of two NO donors, sodium nitroprusside (SNP) and diethylenetriamine NONOate (DETA). LR extension growth was higher with DETA than SNP as NO donor at 40 µM. Iron-deficiency also promoted LR proliferation. It also significantly lowered ACC oxidase activity in the seedling roots in response to salt stress. Based on the present findings it is proposed that salt stress-mediated LR proliferation is regulated by NO through its binding with ACC oxidase (an iron-containing enzyme). This results in the formation of a stable ternary complex (ACC-ACC oxidase-NO) which leads to the reduction in ethylene biosynthesis. Lesser availability of ethylene consequently brings about enhanced LR formation.
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Affiliation(s)
- Neha Singh
- Laboratory of Plant Physiology and Biochemistry, Department of Botany, University of Delhi, Delhi-India
| | - Sathish C. Bhatla
- Laboratory of Plant Physiology and Biochemistry, Department of Botany, University of Delhi, Delhi-India
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31
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Hochholdinger F, Yu P, Marcon C. Genetic Control of Root System Development in Maize. TRENDS IN PLANT SCIENCE 2018; 23:79-88. [PMID: 29170008 DOI: 10.1016/j.tplants.2017.10.004] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Revised: 10/21/2017] [Accepted: 10/25/2017] [Indexed: 05/21/2023]
Abstract
The maize root system comprises structurally and functionally different root types. Mutant analyses have revealed that root-type-specific genetic regulators intrinsically determine the maize root system architecture. Molecular cloning of these genes has demonstrated that key elements of auxin signal transduction, such as LOB domain (LBD) and Aux/IAA proteins, are instrumental for seminal, shoot-borne, and lateral root initiation. Moreover, genetic analyses have demonstrated that genes related to exocytotic vesicle docking, cell wall loosening, and cellulose synthesis and organization control root hair elongation. The identification of upstream regulators, protein interaction partners, and downstream targets of these genes together with cell-type-specific transcriptome analyses have provided novel insights into the regulatory networks controlling root development and architecture in maize.
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Affiliation(s)
- Frank Hochholdinger
- INRES, Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, 53113 Bonn, Germany.
| | - Peng Yu
- INRES, Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, 53113 Bonn, Germany
| | - Caroline Marcon
- INRES, Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, 53113 Bonn, Germany
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Tylová E, Pecková E, Blascheová Z, Soukup A. Casparian bands and suberin lamellae in exodermis of lateral roots: an important trait of roots system response to abiotic stress factors. ANNALS OF BOTANY 2017; 120:71-85. [PMID: 28605408 PMCID: PMC5737840 DOI: 10.1093/aob/mcx047] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Accepted: 04/25/2017] [Indexed: 05/08/2023]
Abstract
Background and Aims Root absorptive characteristics rely on the presence of apoplastic barriers. However, little is known about the establishment of these barriers within a complex root system, particularly in a major portion of them - the lateral roots. In Zea mays L., the exodermis differentiates under the influence of growth conditions. Therefore, the species presents a suitable model to elucidate the cross-talk among environmental conditions, branching pattern and the maturation of barriers within a complex root system involved in the definition of the plant-soil interface. The study describes the extent to which lateral roots differentiate apoplastic barriers in response to changeable environmental conditions. Methods The branching, permeability of the outer cell layers and differentiation of the endo- and exodermis were studied in primary roots and various laterals under different types of stress of agronomic importance (salinity, heavy metal toxicity, hypoxia, etc.). Histochemical methods, image analysis and apoplastic tracer assays were utilized. Key Results The results show that the impact of growth conditions on the differentiation of both the endodermis and exodermis is modulated according to the type/diameter of the root. Fine laterals clearly represent that portion of a complex root system with a less advanced state of barrier differentiation, but with substantial ability to modify exodermis differentiation in response to environmental conditions. In addition, some degree of autonomy in exodermal establishment of Casparian bands (CBs) vs. suberin lamellae (SLs) was observed, as the absence of lignified exodermal CBs did not always fit with the lack of SLs. Conclusions This study highlights the importance of lateral roots, and provides a first look into the developmental variations of apoplastic barriers within a complex root system. It emphasizes that branching and differentiation of barriers in fine laterals may substantially modulate the root system-rhizosphere interaction.
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Affiliation(s)
- Edita Tylová
- Department of Experimental Plant Biology, Faculty of Science, Charles University, Viničná 5, 128 44, Prague 2, Czech Republic
| | - Eva Pecková
- Department of Experimental Plant Biology, Faculty of Science, Charles University, Viničná 5, 128 44, Prague 2, Czech Republic
| | - Zuzana Blascheová
- Department of Experimental Plant Biology, Faculty of Science, Charles University, Viničná 5, 128 44, Prague 2, Czech Republic
| | - Aleš Soukup
- Department of Experimental Plant Biology, Faculty of Science, Charles University, Viničná 5, 128 44, Prague 2, Czech Republic
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Wang J, Pei L, Jin Z, Zhang K, Zhang J. Overexpression of the protein phosphatase 2A regulatory subunit a gene ZmPP2AA1 improves low phosphate tolerance by remodeling the root system architecture of maize. PLoS One 2017; 12:e0176538. [PMID: 28448624 PMCID: PMC5407761 DOI: 10.1371/journal.pone.0176538] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Accepted: 04/12/2017] [Indexed: 11/21/2022] Open
Abstract
Phosphate (Pi) limitation is a constraint for plant growth and development in many natural and agricultural ecosystems. In this study, a gene encoding Zea mays L. protein phosphatase 2A regulatory subunit A, designated ZmPP2AA1, was induced in roots by low Pi availability. The function of the ZmPP2AA1 gene in maize was analyzed using overexpression and RNA interference. ZmPP2AA1 modulated root gravitropism, negatively regulated primary root (PR) growth, and stimulated the development of lateral roots (LRs). A detailed characterization of the root system architecture (RSA) in response to different Pi concentrations with or without indole-3-acetic acid and 1-N-naphthylphthalamic acid revealed that auxin was involved in the RSA response to low Pi availability. Overexpression of ZmPP2AA1 enhanced tolerance to Pi starvation in transgenic maize in hydroponic and soil pot experiments. An increased dry weight (DW), root-to-shoot ratio, and total P content and concentration, along with a delayed and reduced accumulation of anthocyanin in overexpressing transgenic maize plants coincided with their highly branched root system and increased Pi uptake capability under low Pi conditions. Inflorescence development of the ZmPP2AA1 overexpressing line was less affected by low Pi stress, resulting in higher grain yield per plant under Pi deprivation. These data reveal the biological function of ZmPP2AA1, provide insights into a linkage between auxin and low Pi responses, and drive new strategies for the efficient utilization of Pi by maize.
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Affiliation(s)
- Jiemin Wang
- School of Life Sciences, Shandong University, Ministry of Education Key Laboratory of Plant Cell Engineering and Germplasm Enhancement, Jinan, China
| | - Laming Pei
- School of Life Sciences, Shandong University, Ministry of Education Key Laboratory of Plant Cell Engineering and Germplasm Enhancement, Jinan, China
- Department of Biotechnology, School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Zhe Jin
- School of Life Sciences, Shandong University, Ministry of Education Key Laboratory of Plant Cell Engineering and Germplasm Enhancement, Jinan, China
| | - Kewei Zhang
- School of Life Sciences, Shandong University, Ministry of Education Key Laboratory of Plant Cell Engineering and Germplasm Enhancement, Jinan, China
| | - Juren Zhang
- School of Life Sciences, Shandong University, Ministry of Education Key Laboratory of Plant Cell Engineering and Germplasm Enhancement, Jinan, China
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Spiegelman Z, Omer S, Mansfeld BN, Wolf S. Function of Cyclophilin1 as a long-distance signal molecule in the phloem of tomato plants. JOURNAL OF EXPERIMENTAL BOTANY 2017; 68:953-964. [PMID: 28053189 PMCID: PMC5444435 DOI: 10.1093/jxb/erw487] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Tomato (Solanum lycopersicum) diageotropica (dgt) mutants, containing a single mutation in the Cyclophilin1 (SlCyp1) gene, are auxin-insensitive, exhibiting a pleiotropic phenotype including lack of geotropism, abnormal xylem structure, lack of lateral roots (LRs), and elevated shoot-to-root ratio. SlCyp1 is a putative peptidyl-prolyl isomerase that can traffic from shoot to root, where it induces changes in auxin response, LR formation, and xylem development, suggesting it has a role as a long-distance signaling molecule. Here, we explored the mechanism underlying SlCyp1 function in the phloem. Expression of SlCyp1 under a phloem-specific (AtSuc2) promoter in dgt plants partially restored the wild-type phenotype, including lateral root development, root branching, and xylem morphology. The observed developmental changes were associated with physiological alternations at the whole-plant level, including a reduction in shoot-to-root ratio, enhanced transpiration, and elevated photosynthetic rates. Conversely, phloem-specific expression of SlCyp1 active-site mutants did not restore the wild-type phenotype. Local inhibition of cyclophilin functioning in the target tissue reduced auxin sensitivity, suggesting that its enzymatic activity in the distant organ is required for its action as a long-distance signalling agent. The data presented suggest that SlCyp1 is a signal molecule trafficking from shoot to root where its activity is required for auxin-mediated lateral root development.
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Affiliation(s)
- Ziv Spiegelman
- The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, The Robert H. Smith Faculty of Agriculture, Food and Environment, Rehovot 76100, Israel
| | - Sumita Omer
- The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, The Robert H. Smith Faculty of Agriculture, Food and Environment, Rehovot 76100, Israel
| | - Ben N Mansfeld
- The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, The Robert H. Smith Faculty of Agriculture, Food and Environment, Rehovot 76100, Israel
| | - Shmuel Wolf
- The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, The Robert H. Smith Faculty of Agriculture, Food and Environment, Rehovot 76100, Israel
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Mir R, Aranda LZ, Biaocchi T, Luo A, Sylvester AW, Rasmussen CG. A DII Domain-Based Auxin Reporter Uncovers Low Auxin Signaling during Telophase and Early G1. PLANT PHYSIOLOGY 2017; 173:863-871. [PMID: 27881728 PMCID: PMC5210744 DOI: 10.1104/pp.16.01454] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Accepted: 11/21/2016] [Indexed: 05/19/2023]
Abstract
A sensitive and dynamically responsive auxin signaling reporter based on the DII domain of the INDOLE-3-ACETIC ACID28 (IAA28, DII) protein from Arabidopsis (Arabidopsis thaliana) was modified for use in maize (Zea mays). The DII domain was fused to a yellow fluorescent protein and a nuclear localization sequence to simplify quantitative nuclear fluorescence signal. DII degradation dynamics provide an estimate of input signal into the auxin signaling pathway that is influenced by both auxin accumulation and F-box coreceptor concentration. In maize, the DII-based marker responded rapidly and in a dose-dependent manner to exogenous auxin via proteasome-mediated degradation. Low levels of DII-specific fluorescence corresponding to high endogenous auxin signaling occurred near vasculature tissue and the outer layer and glume primordia of spikelet pair meristems and floral meristems, respectively. In addition, high DII levels were observed in cells during telophase and early G1, suggesting that low auxin signaling at these stages may be important for cell cycle progression.
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Affiliation(s)
- Ricardo Mir
- Center for Plant Cell Biology (CEPCEB), Institute for Integrative Genome Biology, Department of Botany and Plant Sciences (R.M., L.Z.A., C.G.R.)
- MARC U-STAR Program (L.Z.A.), and
- Biochemistry and Molecular Biology Graduate Program (T.B.), University of California, Riverside, California 92521; and
- Department of Molecular Biology, University of Wyoming, Laramie, Wyoming 82071 (A.L., A.W.S.)
| | - Leslie Z Aranda
- Center for Plant Cell Biology (CEPCEB), Institute for Integrative Genome Biology, Department of Botany and Plant Sciences (R.M., L.Z.A., C.G.R.)
- MARC U-STAR Program (L.Z.A.), and
- Biochemistry and Molecular Biology Graduate Program (T.B.), University of California, Riverside, California 92521; and
- Department of Molecular Biology, University of Wyoming, Laramie, Wyoming 82071 (A.L., A.W.S.)
| | - Tiffany Biaocchi
- Center for Plant Cell Biology (CEPCEB), Institute for Integrative Genome Biology, Department of Botany and Plant Sciences (R.M., L.Z.A., C.G.R.)
- MARC U-STAR Program (L.Z.A.), and
- Biochemistry and Molecular Biology Graduate Program (T.B.), University of California, Riverside, California 92521; and
- Department of Molecular Biology, University of Wyoming, Laramie, Wyoming 82071 (A.L., A.W.S.)
| | - Anding Luo
- Center for Plant Cell Biology (CEPCEB), Institute for Integrative Genome Biology, Department of Botany and Plant Sciences (R.M., L.Z.A., C.G.R.)
- MARC U-STAR Program (L.Z.A.), and
- Biochemistry and Molecular Biology Graduate Program (T.B.), University of California, Riverside, California 92521; and
- Department of Molecular Biology, University of Wyoming, Laramie, Wyoming 82071 (A.L., A.W.S.)
| | - Anne W Sylvester
- Center for Plant Cell Biology (CEPCEB), Institute for Integrative Genome Biology, Department of Botany and Plant Sciences (R.M., L.Z.A., C.G.R.)
- MARC U-STAR Program (L.Z.A.), and
- Biochemistry and Molecular Biology Graduate Program (T.B.), University of California, Riverside, California 92521; and
- Department of Molecular Biology, University of Wyoming, Laramie, Wyoming 82071 (A.L., A.W.S.)
| | - Carolyn G Rasmussen
- Center for Plant Cell Biology (CEPCEB), Institute for Integrative Genome Biology, Department of Botany and Plant Sciences (R.M., L.Z.A., C.G.R.),
- MARC U-STAR Program (L.Z.A.), and
- Biochemistry and Molecular Biology Graduate Program (T.B.), University of California, Riverside, California 92521; and
- Department of Molecular Biology, University of Wyoming, Laramie, Wyoming 82071 (A.L., A.W.S.)
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36
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Yu P, Gutjahr C, Li C, Hochholdinger F. Genetic Control of Lateral Root Formation in Cereals. TRENDS IN PLANT SCIENCE 2016; 21:951-961. [PMID: 27524642 DOI: 10.1016/j.tplants.2016.07.011] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 07/19/2016] [Accepted: 07/28/2016] [Indexed: 05/03/2023]
Abstract
Cereals form complex root systems composed of different root types. Lateral root formation is a major determinant of root architecture and is instrumental for the efficient uptake of water and nutrients. Positioning and patterning of lateral roots and cell types involved in their formation are unique in monocot cereals. Recent discoveries advanced the molecular understanding of the intrinsic genetic control of initiation and elongation of lateral roots in cereals by distinct, in part root-type-specific genetic programs. Moreover, molecular networks modulating the plasticity of lateral root formation in response to water and nutrient availability and arbuscular mycorrhizal fungal colonization have been identified. These novel discoveries provide a better mechanistic understanding of postembryonic lateral root development in cereals.
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Affiliation(s)
- Peng Yu
- China Agricultural University, College of Resources and Environmental Science, Department of Plant Nutrition, 100193 Beijing, China; University of Bonn, Institute of Crop Science and Resource Conservation (INRES), Crop Functional Genomics, 53113 Bonn, Germany
| | | | - Chunjian Li
- China Agricultural University, College of Resources and Environmental Science, Department of Plant Nutrition, 100193 Beijing, China.
| | - Frank Hochholdinger
- University of Bonn, Institute of Crop Science and Resource Conservation (INRES), Crop Functional Genomics, 53113 Bonn, Germany.
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37
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Taylor-Teeples M, Lanctot A, Nemhauser JL. As above, so below: Auxin's role in lateral organ development. Dev Biol 2016; 419:156-164. [PMID: 26994944 DOI: 10.1016/j.ydbio.2016.03.020] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 03/14/2016] [Accepted: 03/15/2016] [Indexed: 02/02/2023]
Abstract
Organogenesis requires the coordination of many highly-regulated developmental processes, including cell fate determination, cell division and growth, and cell-cell communication. For tissue- and organ-scale coordination, a network of regulators enables molecular events in individual cells to translate into multicellular changes in structure and functional capacity. One recurrent theme in plant developmental networks is a central role for plant hormones, especially auxin. Here, we focus first on describing recent advances in understanding lateral root development, one of the best-studied examples of auxin-mediated organogenesis. We then use this framework to examine the parallel process of emergence of lateral organs in the shoot-a process called phyllotaxy. This comparison reveals a high degree of conservation, highlighting auxin's pivotal role determining overall plant architecture.
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Affiliation(s)
| | - Amy Lanctot
- Department of Biology, University of Washington, Seattle, WA 98195, USA.
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38
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Alarcón MV, Lloret PG, Martín-Partido G, Salguero J. The initiation of lateral roots in the primary roots of maize (Zea mays L.) implies a reactivation of cell proliferation in a group of founder pericycle cells. JOURNAL OF PLANT PHYSIOLOGY 2016; 192:105-10. [PMID: 26905196 DOI: 10.1016/j.jplph.2016.02.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Revised: 02/06/2016] [Accepted: 02/07/2016] [Indexed: 05/03/2023]
Abstract
The initiation of lateral roots (LRs) has generally been viewed as a reactivation of proliferative activity in pericycle cells that are committed to initiate primordia. However, it is also possible that pericycle founder cells that initiate LRs never cease proliferative activity but rather are displaced to the most distal root zones while undertaking successive stages of LR initiation. In this study, we tested these two alternative hypotheses by examining the incorporation of 5-bromo-2'-deoxyuridine (BrdU) into the DNA of meristematic root cells of Zea mays. According to the values for the length of the cell cycle and values for cell displacement along the maize root, our results strongly suggest that pericycle cells that initiate LR primordia ceased proliferative activity upon exiting the meristematic zone. This finding is supported by the existence of a root zone between 4 and 20mm from the root cap junction, in which neither mitotic cells nor labelled nuclei were observed in phloem pericycle cells.
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Affiliation(s)
- M Victoria Alarcón
- Departamento de Hortofruticultura, Centro de Investigación La Orden (CICYTEX), Gobierno de Extremadura, 06187 Badajoz, Spain
| | - Pedro G Lloret
- Departamento de Anatomía, Biología Celular y Zoología, Facultad de Ciencias, Universidad de Extremadura, 06071 Badajoz, Spain
| | - Gervasio Martín-Partido
- Departamento de Anatomía, Biología Celular y Zoología, Facultad de Ciencias, Universidad de Extremadura, 06071 Badajoz, Spain
| | - Julio Salguero
- Departamento de Biología Vegetal, Ecología y Ciencias de la Tierra, Universidad de Extremadura, 06007 Badajoz, Spain.
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Yu P, Baldauf JA, Lithio A, Marcon C, Nettleton D, Li C, Hochholdinger F. Root Type-Specific Reprogramming of Maize Pericycle Transcriptomes by Local High Nitrate Results in Disparate Lateral Root Branching Patterns. PLANT PHYSIOLOGY 2016; 170:1783-98. [PMID: 26811190 PMCID: PMC4775145 DOI: 10.1104/pp.15.01885] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 01/24/2016] [Indexed: 05/18/2023]
Abstract
The adaptability of root system architecture to unevenly distributed mineral nutrients in soil is a key determinant of plant performance. The molecular mechanisms underlying nitrate dependent plasticity of lateral root branching across the different root types of maize are only poorly understood. In this study, detailed morphological and anatomical analyses together with cell type-specific transcriptome profiling experiments combining laser capture microdissection with RNA-seq were performed to unravel the molecular signatures of lateral root formation in primary, seminal, crown, and brace roots of maize (Zea mays) upon local high nitrate stimulation. The four maize root types displayed divergent branching patterns of lateral roots upon local high nitrate stimulation. In particular, brace roots displayed an exceptional architectural plasticity compared to other root types. Transcriptome profiling revealed root type-specific transcriptomic reprogramming of pericycle cells upon local high nitrate stimulation. The alteration of the transcriptomic landscape of brace root pericycle cells in response to local high nitrate stimulation was most significant. Root type-specific transcriptome diversity in response to local high nitrate highlighted differences in the functional adaptability and systemic shoot nitrogen starvation response during development. Integration of morphological, anatomical, and transcriptomic data resulted in a framework underscoring similarity and diversity among root types grown in heterogeneous nitrate environments.
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Affiliation(s)
- Peng Yu
- Department of Plant Nutrition, China Agricultural University, 100193 Beijing, China (P.Y., C.L.);Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, 53113 Bonn, Germany (P.Y., J.A.B., C.M., F.H.); andDepartment of Statistics, Iowa State University, Ames, Iowa 50011-1210 (A.L., D.N.)
| | - Jutta A Baldauf
- Department of Plant Nutrition, China Agricultural University, 100193 Beijing, China (P.Y., C.L.);Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, 53113 Bonn, Germany (P.Y., J.A.B., C.M., F.H.); andDepartment of Statistics, Iowa State University, Ames, Iowa 50011-1210 (A.L., D.N.)
| | - Andrew Lithio
- Department of Plant Nutrition, China Agricultural University, 100193 Beijing, China (P.Y., C.L.);Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, 53113 Bonn, Germany (P.Y., J.A.B., C.M., F.H.); andDepartment of Statistics, Iowa State University, Ames, Iowa 50011-1210 (A.L., D.N.)
| | - Caroline Marcon
- Department of Plant Nutrition, China Agricultural University, 100193 Beijing, China (P.Y., C.L.);Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, 53113 Bonn, Germany (P.Y., J.A.B., C.M., F.H.); andDepartment of Statistics, Iowa State University, Ames, Iowa 50011-1210 (A.L., D.N.)
| | - Dan Nettleton
- Department of Plant Nutrition, China Agricultural University, 100193 Beijing, China (P.Y., C.L.);Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, 53113 Bonn, Germany (P.Y., J.A.B., C.M., F.H.); andDepartment of Statistics, Iowa State University, Ames, Iowa 50011-1210 (A.L., D.N.)
| | - Chunjian Li
- Department of Plant Nutrition, China Agricultural University, 100193 Beijing, China (P.Y., C.L.);Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, 53113 Bonn, Germany (P.Y., J.A.B., C.M., F.H.); andDepartment of Statistics, Iowa State University, Ames, Iowa 50011-1210 (A.L., D.N.)
| | - Frank Hochholdinger
- Department of Plant Nutrition, China Agricultural University, 100193 Beijing, China (P.Y., C.L.);Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, 53113 Bonn, Germany (P.Y., J.A.B., C.M., F.H.); andDepartment of Statistics, Iowa State University, Ames, Iowa 50011-1210 (A.L., D.N.)
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40
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Zhang Y, Marcon C, Tai H, von Behrens I, Ludwig Y, Hey S, Berendzen KW, Hochholdinger F. Conserved and unique features of the homeologous maize Aux/IAA proteins ROOTLESS WITH UNDETECTABLE MERISTEM 1 and RUM1-like 1. JOURNAL OF EXPERIMENTAL BOTANY 2016; 67:1137-47. [PMID: 26672614 PMCID: PMC4753850 DOI: 10.1093/jxb/erv519] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
The maize (Zea mays L.) Aux/IAA protein RUM1 (ROOTLESS WITH UNDETECTABLE MERISTEM 1) is a key regulator of lateral and seminal root formation. An ancient maize genome duplication resulted in the emergence of its homeolog rum1-like1 (rul1), which displays 92% amino acid sequence identity with RUM1. Both, RUL1 and RUM1 exhibit the canonical four domain structure of Aux/IAA proteins. Moreover, both are localized to the nucleus, are instable and have similar short half-lives of ~23min. Moreover, RUL1 and RUM1 can be stabilized by specific mutations in the five amino acid degron sequence of domain II. In addition, proteins encoded by both genes interact in vivo with auxin response factors (ARFs) such as ZmARF25 and ZmARF34 in protoplasts. Although it was demonstrated that RUL1 and RUM1 can homo and heterodimerize in vivo, rul1 expression is independent of rum1. Moreover, on average rul1 expression is ~84-fold higher than rum1 in the 12 tested tissues and developmental stages, although the relative expression levels in different root tissues are very similar. While RUM1 and RUL1 display conserved biochemical properties, yeast-two-hybrid in combination with BiFC experiments identified a RUM1-associated protein 1 (RAP1) that specifically interacts with RUM1 but not with RUL1. This suggests that RUM1 and RUL1 are at least in part interwoven into different molecular networks.
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Affiliation(s)
- Yanxiang Zhang
- Center for Molecular Cell and Systems Biology, College of Life Science, Fujian Agriculture & Forestry University, 350002 Fuzhou, China Crop Functional Genomics, Institute of Crop Science and Resource Conservation, University of Bonn, 53113 Bonn, Germany
| | - Caroline Marcon
- Crop Functional Genomics, Institute of Crop Science and Resource Conservation, University of Bonn, 53113 Bonn, Germany
| | - Huanhuan Tai
- Crop Functional Genomics, Institute of Crop Science and Resource Conservation, University of Bonn, 53113 Bonn, Germany
| | - Inga von Behrens
- ZMBP, Center for Plant Molecular Biology, General Genetics, University of Tuebingen, 72076 Tuebingen, Germany
| | - Yvonne Ludwig
- Crop Functional Genomics, Institute of Crop Science and Resource Conservation, University of Bonn, 53113 Bonn, Germany
| | - Stefan Hey
- Crop Functional Genomics, Institute of Crop Science and Resource Conservation, University of Bonn, 53113 Bonn, Germany
| | - Kenneth W Berendzen
- ZMBP, Center for Plant Molecular Biology, Central Facilities, University of Tuebingen, 72076 Tuebingen, Germany
| | - Frank Hochholdinger
- Crop Functional Genomics, Institute of Crop Science and Resource Conservation, University of Bonn, 53113 Bonn, Germany
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41
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Yu P, Eggert K, von Wirén N, Li C, Hochholdinger F. Cell Type-Specific Gene Expression Analyses by RNA Sequencing Reveal Local High Nitrate-Triggered Lateral Root Initiation in Shoot-Borne Roots of Maize by Modulating Auxin-Related Cell Cycle Regulation. PLANT PHYSIOLOGY 2015; 169:690-704. [PMID: 26198256 PMCID: PMC4577424 DOI: 10.1104/pp.15.00888] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Accepted: 07/20/2015] [Indexed: 05/18/2023]
Abstract
Plants have evolved a unique plasticity of their root system architecture to flexibly exploit heterogeneously distributed mineral elements from soil. Local high concentrations of nitrate trigger lateral root initiation in adult shoot-borne roots of maize (Zea mays) by increasing the frequency of early divisions of phloem pole pericycle cells. Gene expression profiling revealed that, within 12 h of local high nitrate induction, cell cycle activators (cyclin-dependent kinases and cyclin B) were up-regulated, whereas repressors (Kip-related proteins) were down-regulated in the pericycle of shoot-borne roots. In parallel, a ubiquitin protein ligase S-Phase Kinase-Associated Protein1-cullin-F-box protein(S-Phase Kinase-Associated Protein 2B)-related proteasome pathway participated in cell cycle control. The division of pericycle cells was preceded by increased levels of free indole-3-acetic acid in the stele, resulting in DR5-red fluorescent protein-marked auxin response maxima at the phloem poles. Moreover, laser-capture microdissection-based gene expression analyses indicated that, at the same time, a significant local high nitrate induction of the monocot-specific PIN-FORMED9 gene in phloem pole cells modulated auxin efflux to pericycle cells. Time-dependent gene expression analysis further indicated that local high nitrate availability resulted in PIN-FORMED9-mediated auxin efflux and subsequent cell cycle activation, which culminated in the initiation of lateral root primordia. This study provides unique insights into how adult maize roots translate information on heterogeneous nutrient availability into targeted root developmental responses.
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Affiliation(s)
- Peng Yu
- Department of Plant Nutrition, China Agricultural University, Beijing 100193, China (P.Y., C.L.);Division of Crop Functional Genomics, Institute of Crop Science and Resource Conservation, University of Bonn, 53113 Bonn, Germany (P.Y., F.H.); andMolecular Plant Nutrition, Leibniz Institute for Plant Genetics and Crop Plant Research, D-06466 Gatersleben, Germany (K.E., N.v.W.)
| | - Kai Eggert
- Department of Plant Nutrition, China Agricultural University, Beijing 100193, China (P.Y., C.L.);Division of Crop Functional Genomics, Institute of Crop Science and Resource Conservation, University of Bonn, 53113 Bonn, Germany (P.Y., F.H.); andMolecular Plant Nutrition, Leibniz Institute for Plant Genetics and Crop Plant Research, D-06466 Gatersleben, Germany (K.E., N.v.W.)
| | - Nicolaus von Wirén
- Department of Plant Nutrition, China Agricultural University, Beijing 100193, China (P.Y., C.L.);Division of Crop Functional Genomics, Institute of Crop Science and Resource Conservation, University of Bonn, 53113 Bonn, Germany (P.Y., F.H.); andMolecular Plant Nutrition, Leibniz Institute for Plant Genetics and Crop Plant Research, D-06466 Gatersleben, Germany (K.E., N.v.W.)
| | - Chunjian Li
- Department of Plant Nutrition, China Agricultural University, Beijing 100193, China (P.Y., C.L.);Division of Crop Functional Genomics, Institute of Crop Science and Resource Conservation, University of Bonn, 53113 Bonn, Germany (P.Y., F.H.); andMolecular Plant Nutrition, Leibniz Institute for Plant Genetics and Crop Plant Research, D-06466 Gatersleben, Germany (K.E., N.v.W.)
| | - Frank Hochholdinger
- Department of Plant Nutrition, China Agricultural University, Beijing 100193, China (P.Y., C.L.);Division of Crop Functional Genomics, Institute of Crop Science and Resource Conservation, University of Bonn, 53113 Bonn, Germany (P.Y., F.H.); andMolecular Plant Nutrition, Leibniz Institute for Plant Genetics and Crop Plant Research, D-06466 Gatersleben, Germany (K.E., N.v.W.)
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Zhang Y, von Behrens I, Zimmermann R, Ludwig Y, Hey S, Hochholdinger F. LATERAL ROOT PRIMORDIA 1 of maize acts as a transcriptional activator in auxin signalling downstream of the Aux/IAA gene rootless with undetectable meristem 1. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:3855-63. [PMID: 25911745 PMCID: PMC4473986 DOI: 10.1093/jxb/erv187] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Only little is known about target genes of auxin signalling downstream of the Aux/IAA-ARF module. In the present study, it has been demonstrated that maize lateral root primordia 1 (lrp1) encodes a transcriptional activator that is directly regulated by the Aux/IAA protein ROOTLESS WITH UNDETECTABLE MERISTEM 1 (RUM1). Expression of lrp1 is confined to early root primordia and meristems and is auxin-inducible. Based on its primary protein structure, LRP1 is predicted to be a transcription factor. This notion is supported by exclusive LRP1 localization in the nucleus and its ability to activate downstream gene activity. Based on the observation that lrp1 transcription is completely repressed in the semi-dominant gain of function mutant rum1, it was demonstrated that the lrp1 promoter is a direct target of RUM1 proteins. Subsequently, promoter activation assays indicated that RUM1 represses the expression of a GFP reporter fused to the native promoter of lrp1. Constitutive repression of lrp1 in rum1 mutants is a consequence of the stability of mutated rum1 proteins which cannot be degraded by the proteasome and thus constitutively bind to the lrp1 promoter and repress transcription. Taken together, the repression of the transcriptional activator lrp1 by direct binding of RUM1 to its promoter, together with specific expression of lrp1 in root meristems, suggests a function in maize root development via the RUM1-dependent auxin signalling pathway.
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Affiliation(s)
- Yanxiang Zhang
- INRES, Institute of Crop Science and Resource Conservation, Crop Functional Genomics, Friedrich-Ebert-Allee 144, University of Bonn, D-53113 Bonn, Germany Center for Molecular Cell and Systems Biology, College of Life Science, Fujian Agriculture & Forestry University, 350002 Fuzhou, China
| | - Inga von Behrens
- ZMBP, Center for Plant Molecular Biology, Department of General Genetics, University of Tuebingen, D-72076 Tuebingen, Germany
| | - Roman Zimmermann
- ZMBP, Center for Plant Molecular Biology, Department of General Genetics, University of Tuebingen, D-72076 Tuebingen, Germany
| | - Yvonne Ludwig
- INRES, Institute of Crop Science and Resource Conservation, Crop Functional Genomics, Friedrich-Ebert-Allee 144, University of Bonn, D-53113 Bonn, Germany
| | - Stefan Hey
- INRES, Institute of Crop Science and Resource Conservation, Crop Functional Genomics, Friedrich-Ebert-Allee 144, University of Bonn, D-53113 Bonn, Germany
| | - Frank Hochholdinger
- INRES, Institute of Crop Science and Resource Conservation, Crop Functional Genomics, Friedrich-Ebert-Allee 144, University of Bonn, D-53113 Bonn, Germany
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43
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Genome-wide identification and expression profiling analysis of ZmPIN, ZmPILS, ZmLAX and ZmABCB auxin transporter gene families in maize (Zea mays L.) under various abiotic stresses. PLoS One 2015; 10:e0118751. [PMID: 25742625 PMCID: PMC4351008 DOI: 10.1371/journal.pone.0118751] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Accepted: 01/06/2015] [Indexed: 11/30/2022] Open
Abstract
The auxin influx carriers auxin resistant 1/like aux 1 (AUX/LAX), efflux carriers pin-formed (PIN) (together with PIN-like proteins) and efflux/conditional P-glycoprotein (ABCB) are major protein families involved in auxin polar transport. However, how they function in responses to exogenous auxin and abiotic stresses in maize is largely unknown. In this work, the latest updated maize (Zea mays L.) reference genome sequence was used to characterize and analyze the ZmLAX, ZmPIN, ZmPILS and ZmABCB family genes from maize. The results showed that five ZmLAXs, fifteen ZmPINs, nine ZmPILSs and thirty-five ZmABCBs were mapped on all ten maize chromosomes. Highly diversified gene structures, nonconservative transmembrane helices and tissue-specific expression patterns suggested the possibility of function diversification for these genes. Quantitative real-time polymerase chain reaction (qRT-PCR) was used to analyze the expression patterns of ZmLAX, ZmPIN, ZmPILS and ZmABCB genes under exogenous auxin and different environmental stresses. The expression levels of most ZmPIN, ZmPILS, ZmLAX and ZmABCB genes were induced in shoots and were reduced in roots by various abiotic stresses (drought, salt and cold stresses). The opposite expression response patterns indicated the dynamic auxin transport between shoots and roots under abiotic stresses. Analysis of the expression patterns of ZmPIN, ZmPILS, ZmLAX and ZmABCB genes under drought, salt and cold treatment may help us to understand the possible roles of maize auxin transporter genes in responses and tolerance to environmental stresses.
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44
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Atkinson JA, Rasmussen A, Traini R, Voß U, Sturrock C, Mooney SJ, Wells DM, Bennett MJ. Branching out in roots: uncovering form, function, and regulation. PLANT PHYSIOLOGY 2014; 166:538-50. [PMID: 25136060 PMCID: PMC4213086 DOI: 10.1104/pp.114.245423] [Citation(s) in RCA: 153] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Accepted: 08/12/2013] [Indexed: 05/18/2023]
Abstract
Root branching is critical for plants to secure anchorage and ensure the supply of water, minerals, and nutrients. To date, research on root branching has focused on lateral root development in young seedlings. However, many other programs of postembryonic root organogenesis exist in angiosperms. In cereal crops, the majority of the mature root system is composed of several classes of adventitious roots that include crown roots and brace roots. In this Update, we initially describe the diversity of postembryonic root forms. Next, we review recent advances in our understanding of the genes, signals, and mechanisms regulating lateral root and adventitious root branching in the plant models Arabidopsis (Arabidopsis thaliana), maize (Zea mays), and rice (Oryza sativa). While many common signals, regulatory components, and mechanisms have been identified that control the initiation, morphogenesis, and emergence of new lateral and adventitious root organs, much more remains to be done. We conclude by discussing the challenges and opportunities facing root branching research.
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Affiliation(s)
- Jonathan A Atkinson
- Centre for Plant Integrative Biology, School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, United Kingdom (J.A.A., A.R., R.T., U.V., C.S., S.J.M., D.M.W., M.J.B.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (M.J.B.)
| | - Amanda Rasmussen
- Centre for Plant Integrative Biology, School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, United Kingdom (J.A.A., A.R., R.T., U.V., C.S., S.J.M., D.M.W., M.J.B.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (M.J.B.)
| | - Richard Traini
- Centre for Plant Integrative Biology, School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, United Kingdom (J.A.A., A.R., R.T., U.V., C.S., S.J.M., D.M.W., M.J.B.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (M.J.B.)
| | - Ute Voß
- Centre for Plant Integrative Biology, School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, United Kingdom (J.A.A., A.R., R.T., U.V., C.S., S.J.M., D.M.W., M.J.B.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (M.J.B.)
| | - Craig Sturrock
- Centre for Plant Integrative Biology, School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, United Kingdom (J.A.A., A.R., R.T., U.V., C.S., S.J.M., D.M.W., M.J.B.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (M.J.B.)
| | - Sacha J Mooney
- Centre for Plant Integrative Biology, School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, United Kingdom (J.A.A., A.R., R.T., U.V., C.S., S.J.M., D.M.W., M.J.B.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (M.J.B.)
| | - Darren M Wells
- Centre for Plant Integrative Biology, School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, United Kingdom (J.A.A., A.R., R.T., U.V., C.S., S.J.M., D.M.W., M.J.B.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (M.J.B.)
| | - Malcolm J Bennett
- Centre for Plant Integrative Biology, School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, United Kingdom (J.A.A., A.R., R.T., U.V., C.S., S.J.M., D.M.W., M.J.B.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (M.J.B.)
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45
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Yu P, White PJ, Hochholdinger F, Li C. Phenotypic plasticity of the maize root system in response to heterogeneous nitrogen availability. PLANTA 2014; 240:667-78. [PMID: 25143250 DOI: 10.1007/s00425-014-2150-y] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 08/08/2014] [Indexed: 05/03/2023]
Abstract
Mineral nutrients are distributed in a non-uniform manner in the soil. Plasticity in root responses to the availability of mineral nutrients is believed to be important for optimizing nutrient acquisition. The response of root architecture to heterogeneous nutrient availability has been documented in various plant species, and the molecular mechanisms coordinating these responses have been investigated particularly in Arabidopsis, a model dicotyledonous plant. Recently, progress has been made in describing the phenotypic plasticity of root architecture in maize, a monocotyledonous crop. This article reviews aspects of phenotypic plasticity of maize root system architecture, with special emphasis on describing (1) the development of its complex root system; (2) phenotypic responses in root system architecture to heterogeneous N availability; (3) the importance of phenotypic plasticity for N acquisition; (4) different regulation of root growth and nutrients uptake by shoot; and (5) root traits in maize breeding. This knowledge will inform breeding strategies for root traits enabling more efficient acquisition of soil resources and synchronizing crop growth demand, root resource acquisition and fertilizer application during crop growing season, thereby maximizing crop yields and nutrient-use efficiency and minimizing environmental pollution.
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Affiliation(s)
- Peng Yu
- Department of Plant Nutrition, China Agricultural University, Yuanmingyuan West Road 2, Beijing, 100193, People's Republic of China
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46
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Zhang Y, Paschold A, Marcon C, Liu S, Tai H, Nestler J, Yeh CT, Opitz N, Lanz C, Schnable PS, Hochholdinger F. The Aux/IAA gene rum1 involved in seminal and lateral root formation controls vascular patterning in maize (Zea mays L.) primary roots. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:4919-30. [PMID: 24928984 PMCID: PMC4144770 DOI: 10.1093/jxb/eru249] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The maize (Zea mays L.) Aux/IAA protein RUM1 (ROOTLESS WITH UNDETECTABLE MERISTEMS 1) controls seminal and lateral root initiation. To identify RUM1-dependent gene expression patterns, RNA-Seq of the differentiation zone of primary roots of rum1 mutants and the wild type was performed in four biological replicates. In total, 2 801 high-confidence maize genes displayed differential gene expression with Fc ≥2 and FDR ≤1%. The auxin signalling-related genes rum1, like-auxin1 (lax1), lax2, (nam ataf cuc 1 nac1), the plethora genes plt1 (plethora 1), bbm1 (baby boom 1), and hscf1 (heat shock complementing factor 1) and the auxin response factors arf8 and arf37 were down-regulated in the mutant rum1. All of these genes except nac1 were auxin-inducible. The maize arf8 and arf37 genes are orthologues of Arabidopsis MP/ARF5 (MONOPTEROS/ARF5), which controls the differentiation of vascular cells. Histological analyses of mutant rum1 roots revealed defects in xylem organization and the differentiation of pith cells around the xylem. Moreover, histochemical staining of enlarged pith cells surrounding late metaxylem elements demonstrated that their thickened cell walls displayed excessive lignin deposition. In line with this phenotype, rum1-dependent mis-expression of several lignin biosynthesis genes was observed. In summary, RNA-Seq of RUM1-dependent gene expression in maize primary roots, in combination with histological and histochemical analyses, revealed the specific regulation of auxin signal transduction components by RUM1 and novel functions of RUM1 in vascular development.
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Affiliation(s)
- Yanxiang Zhang
- INRES, Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, Friedrich-Ebert-Allee 144, 53113 Bonn, Germany
| | - Anja Paschold
- INRES, Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, Friedrich-Ebert-Allee 144, 53113 Bonn, Germany
| | - Caroline Marcon
- INRES, Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, Friedrich-Ebert-Allee 144, 53113 Bonn, Germany
| | - Sanzhen Liu
- Department of Agronomy, Iowa State University, Ames 50011-3650, Iowa, USA
| | - Huanhuan Tai
- INRES, Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, Friedrich-Ebert-Allee 144, 53113 Bonn, Germany
| | - Josefine Nestler
- INRES, Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, Friedrich-Ebert-Allee 144, 53113 Bonn, Germany
| | - Cheng-Ting Yeh
- Center for Plant Genomics, Iowa State University, Ames 50011-3650, Iowa, USA
| | - Nina Opitz
- INRES, Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, Friedrich-Ebert-Allee 144, 53113 Bonn, Germany
| | - Christa Lanz
- Department of Molecular Biology, Max-Planck-Institute for Developmental Biology, 72076 Tuebingen, Germany
| | - Patrick S Schnable
- Department of Agronomy, Iowa State University, Ames 50011-3650, Iowa, USA Center for Plant Genomics, Iowa State University, Ames 50011-3650, Iowa, USA
| | - Frank Hochholdinger
- INRES, Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, Friedrich-Ebert-Allee 144, 53113 Bonn, Germany
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47
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Villordon AQ, Ginzberg I, Firon N. Root architecture and root and tuber crop productivity. TRENDS IN PLANT SCIENCE 2014; 19:419-25. [PMID: 24630073 DOI: 10.1016/j.tplants.2014.02.002] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Revised: 01/27/2014] [Accepted: 02/06/2014] [Indexed: 05/03/2023]
Abstract
It is becoming increasingly evident that optimization of root architecture for resource capture is vital for enabling the next green revolution. Although cereals provide half of the calories consumed by humans, root and tuber crops are the second major source of carbohydrates globally. Yet, knowledge of root architecture in root and tuber species is limited. In this opinion article, we highlight what is known about the root system in root and tuber crops, and mark new research directions towards a better understanding of the relation between root architecture and yield. We believe that unraveling the role of root architecture in root and tuber crop productivity will improve global food security, especially in regions with marginal soil fertility and low-input agricultural systems.
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Affiliation(s)
- Arthur Q Villordon
- Louisiana State University Agricultural Center Sweet Potato Research Station, Chase, LA 71324, USA.
| | - Idit Ginzberg
- Institute of Plant Sciences, The Volcani Center, Agricultural Research Organization, PO Box 6, Bet Dagan, 50250, Israel
| | - Nurit Firon
- Institute of Plant Sciences, The Volcani Center, Agricultural Research Organization, PO Box 6, Bet Dagan, 50250, Israel
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48
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Yang ZB, Geng X, He C, Zhang F, Wang R, Horst WJ, Ding Z. TAA1-regulated local auxin biosynthesis in the root-apex transition zone mediates the aluminum-induced inhibition of root growth in Arabidopsis. THE PLANT CELL 2014; 26:2889-904. [PMID: 25052716 PMCID: PMC4145121 DOI: 10.1105/tpc.114.127993] [Citation(s) in RCA: 133] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Revised: 06/18/2014] [Accepted: 06/28/2014] [Indexed: 05/02/2023]
Abstract
The transition zone (TZ) of the root apex is the perception site of Al toxicity. Here, we show that exposure of Arabidopsis thaliana roots to Al induces a localized enhancement of auxin signaling in the root-apex TZ that is dependent on TAA1, which encodes a Trp aminotransferase and regulates auxin biosynthesis. TAA1 is specifically upregulated in the root-apex TZ in response to Al treatment, thus mediating local auxin biosynthesis and inhibition of root growth. The TAA1-regulated local auxin biosynthesis in the root-apex TZ in response to Al stress is dependent on ethylene, as revealed by manipulating ethylene homeostasis via the precursor of ethylene biosynthesis 1-aminocyclopropane-1-carboxylic acid, the inhibitor of ethylene biosynthesis aminoethoxyvinylglycine, or mutant analysis. In response to Al stress, ethylene signaling locally upregulates TAA1 expression and thus auxin responses in the TZ and results in auxin-regulated root growth inhibition through a number of auxin response factors (ARFs). In particular, ARF10 and ARF16 are important in the regulation of cell wall modification-related genes. Our study suggests a mechanism underlying how environmental cues affect root growth plasticity through influencing local auxin biosynthesis and signaling.
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Affiliation(s)
- Zhong-Bao Yang
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, College of Life Science, Shandong University, Jinan 250100, People's Republic of China
| | - Xiaoyu Geng
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, College of Life Science, Shandong University, Jinan 250100, People's Republic of China
| | - Chunmei He
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, College of Life Science, Shandong University, Jinan 250100, People's Republic of China
| | - Feng Zhang
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, College of Life Science, Shandong University, Jinan 250100, People's Republic of China
| | - Rong Wang
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, College of Life Science, Shandong University, Jinan 250100, People's Republic of China
| | - Walter J Horst
- Institute of Plant Nutrition, Leibniz Universität Hannover, 30419 Hannover, Germany
| | - Zhaojun Ding
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, College of Life Science, Shandong University, Jinan 250100, People's Republic of China
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49
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Herrbach V, Remblière C, Gough C, Bensmihen S. Lateral root formation and patterning in Medicago truncatula. JOURNAL OF PLANT PHYSIOLOGY 2014; 171:301-10. [PMID: 24148318 DOI: 10.1016/j.jplph.2013.09.006] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 09/06/2013] [Accepted: 09/06/2013] [Indexed: 05/08/2023]
Abstract
The plant root system is crucial for anchorage and nutrition, and has a major role in plant adaptation, as well as in interactions with soil micro-organisms. Despite the agronomical and ecological importance of legume plants, whose roots can interact symbiotically with soil bacteria called rhizobia that fix atmospheric dinitrogen, and the evidence that lateral root (LR) development programmes are intercepted and influenced by symbiotic organisms, very little is known concerning the cellular and molecular events governing LR development in legumes. To better understand the interconnections between LR formation and symbiotic processes triggered by rhizobia or symbiotic molecules such as lipo-chitooligosaccharides (LCOs), we first need a detailed description of LR development mechanisms in legumes. Using thin sections, we have described the cellular events leading to the formation of a new LR primordium (LRP) in Medicago truncatula, and divided them into seven stages prior to LR emergence. To monitor auxin accumulation we generated transgenic DR5:GUS and DR5:VENUS-N7 reporter lines of M. truncatula, and used them to analyze early stages of LR development. Interesting differences were observed for LR ontogeny compared to Arabidopsis thaliana. Notably, we observed endodermal and cortical contributions to LRP formation, and the associated DR5:GUS expression profile indicated that endodermal and cortical cell divisions were correlated with auxin accumulation. As described for A. thaliana, we observed a preferential zone for LR initiation at 4.45 mm from the root tip. Finally, we studied LR emergence and showed that a significant proportion of new LRP do not emerge straight away and could thus be an additional source of root plasticity. Our results shed new light on the patterning and early development of LRs in M. truncatula.
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Affiliation(s)
- Violaine Herrbach
- INRA, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR441, F-31326 Castanet-Tolosan, France; CNRS, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR2594, F-31326 Castanet-Tolosan, France
| | - Céline Remblière
- INRA, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR441, F-31326 Castanet-Tolosan, France; CNRS, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR2594, F-31326 Castanet-Tolosan, France
| | - Clare Gough
- INRA, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR441, F-31326 Castanet-Tolosan, France; CNRS, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR2594, F-31326 Castanet-Tolosan, France
| | - Sandra Bensmihen
- INRA, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR441, F-31326 Castanet-Tolosan, France; CNRS, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR2594, F-31326 Castanet-Tolosan, France.
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50
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Van Norman JM, Xuan W, Beeckman T, Benfey PN. To branch or not to branch: the role of pre-patterning in lateral root formation. Development 2013; 140:4301-10. [PMID: 24130327 DOI: 10.1242/dev.090548] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The establishment of a pre-pattern or competence to form new organs is a key feature of the postembryonic plasticity of plant development, and the elaboration of such pre-patterns leads to remarkable heterogeneity in plant form. In root systems, many of the differences in architecture can be directly attributed to the outgrowth of lateral roots. In recent years, efforts have focused on understanding how the pattern of lateral roots is established. Here, we review recent findings that point to a periodic mechanism for establishing this pattern, as well as roles for plant hormones, particularly auxin, in the earliest steps leading up to lateral root primordium development. In addition, we compare the development of lateral root primordia with in vitro plant regeneration and discuss possible common molecular mechanisms.
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Affiliation(s)
- Jaimie M Van Norman
- Department of Biology, Duke Center for Systems Biology and Howard Hughes Medical Institute, Duke University, Durham, NC 27708, USA
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