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Cheng L, Zhao S, Li F, Ni X, Yang N, Yu J, Wang X. Overexpression of EgrZFP6 from Eucalyptus grandis increases ROS levels by downregulating photosynthesis in plants. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 214:108972. [PMID: 39067106 DOI: 10.1016/j.plaphy.2024.108972] [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: 03/03/2024] [Revised: 07/06/2024] [Accepted: 07/23/2024] [Indexed: 07/30/2024]
Abstract
In plants, abiotic stressors are frequently encountered during growth and development. To counteract these challenges, zinc finger proteins play a critical role as transcriptional regulators. The EgrZFP6 gene, which codes for a zinc finger protein of the C2H2 type, was shown to be considerably elevated in the leaves of Eucalyptus grandis seedlings in the current study when they were subjected to a variety of abiotic stimuli, including heat, salinity, cold, and drought. Analysis conducted later showed that in EgrZFP6 transgenic Arabidopsis thaliana, EgrZFP6 was essential for causing hyponastic leaves and controlling the stress response. Furthermore, the transgenic plants showed elevated levels of reactive oxygen species (ROS), such as superoxide and hydrogen peroxide (H2O2). Additionally, in EgrZFP6-overexpressing plants, transcriptome sequencing analysis demonstrated a considerable downregulation of many genes involved in photosynthesis, decreasing electron transport efficiency and perhaps promoting the buildup of ROS. Auxin levels were higher and auxin signal transduction was compromised in the transgenic plants. Stress-related genes were also upregulated in Arabidopsis as a result of EgrZFP6 overexpression. It is hypothesized that EgrZFP6 can downregulate photosynthesis, which would cause the production of ROS in chloroplasts. As a result, this protein may alter plant stress responses and leaf morphology via a retrograde mechanism driven by ROS. These results highlight the significance of zinc finger proteins in this sophisticated process and advance our understanding of the complex link between gene regulation, ROS signaling, and plant stress responses.
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Affiliation(s)
- Longjun Cheng
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, Zhejiang, 311300, China.
| | - Shuang Zhao
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, Zhejiang, 311300, China
| | - Fangyan Li
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, Zhejiang, 311300, China
| | - Xiaoxiang Ni
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, Zhejiang, 311300, China
| | - Ning Yang
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, Zhejiang, 311300, China
| | - Jianfeng Yu
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, Zhejiang, 311300, China
| | - Xiaofei Wang
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, Zhejiang, 311300, China.
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Álvarez-Rodríguez S, Araniti F, Teijeira M, Reigosa MJ, Sánchez-Moreiras AM. Azelaic acid can efficiently compete for the auxin binding site TIR1, altering auxin polar transport, gravitropic response, and root growth and architecture in Arabidopsisthaliana roots. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 210:108592. [PMID: 38569422 DOI: 10.1016/j.plaphy.2024.108592] [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: 01/27/2024] [Accepted: 03/31/2024] [Indexed: 04/05/2024]
Abstract
The present study investigates the phytotoxic potential of azelaic acid (AZA) on Arabidopsis thaliana roots. Effects on root morphology, anatomy, auxin content and transport, gravitropic response and molecular docking were analysed. AZA inhibited root growth, stimulated lateral and adventitious roots, and altered the root apical meristem by reducing meristem cell number, length and width. The treatment also slowed down the roots' gravitropic response, likely due to a reduction in statoliths, starch-rich organelles involved in gravity perception. In addition, auxin content, transport and distribution, together with PIN proteins' expression and localisation were altered after AZA treatment, inducing a reduction in auxin transport and its distribution into the meristematic zone. Computational simulations showed that AZA has a high affinity for the auxin receptor TIR1, competing with auxin for the binding site. The AZA binding with TIR1 could interfere with the normal functioning of the TIR1/AFB complex, disrupting the ubiquitin E3 ligase complex and leading to alterations in the response of the plant, which could perceive AZA as an exogenous auxin. Our results suggest that AZA mode of action could involve the modulation of auxin-related processes in Arabidopsis roots. Understanding such mechanisms could lead to find environmentally friendly alternatives to synthetic herbicides.
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Affiliation(s)
- Sara Álvarez-Rodríguez
- Universidade de Vigo. Departamento de Bioloxía Vexetal e Ciencias do Solo, Facultade de Bioloxía, Campus Lagoas-Marcosende s/n, 36310, Vigo, Spain; Instituto de Agroecoloxía e Alimentación (IAA). Universidade de Vigo - Campus Auga, 32004, Ourense, Spain
| | - Fabrizio Araniti
- Dipartimento di Scienze Agrarie e Ambientali - Produzione, Territorio, Agroenergia, Università Statale di Milano, Via Celoria nº2, 20133, Milano, Italy.
| | - Marta Teijeira
- Departamento de Química Orgánica, Facultade de Química, Universidade de Vigo, 36310, Vigo, Spain; Instituto de Investigación Sanitaria Galicia Sur, Hospital Álvaro Cunqueiro, 36213, Vigo, Spain
| | - Manuel J Reigosa
- Universidade de Vigo. Departamento de Bioloxía Vexetal e Ciencias do Solo, Facultade de Bioloxía, Campus Lagoas-Marcosende s/n, 36310, Vigo, Spain; Instituto de Agroecoloxía e Alimentación (IAA). Universidade de Vigo - Campus Auga, 32004, Ourense, Spain
| | - Adela M Sánchez-Moreiras
- Universidade de Vigo. Departamento de Bioloxía Vexetal e Ciencias do Solo, Facultade de Bioloxía, Campus Lagoas-Marcosende s/n, 36310, Vigo, Spain; Instituto de Agroecoloxía e Alimentación (IAA). Universidade de Vigo - Campus Auga, 32004, Ourense, Spain
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3
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Mishra P, Roggen A, Ljung K, Albani MC, Vayssières A. Adventitious rooting in response to long-term cold: a possible mechanism of clonal growth in alpine perennials. FRONTIERS IN PLANT SCIENCE 2024; 15:1352830. [PMID: 38693930 PMCID: PMC11062184 DOI: 10.3389/fpls.2024.1352830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Accepted: 03/22/2024] [Indexed: 05/03/2024]
Abstract
Arctic alpine species experience extended periods of cold and unpredictable conditions during flowering. Thus, often, alpine plants use both sexual and asexual means of reproduction to maximize fitness and ensure reproductive success. We used the arctic alpine perennial Arabis alpina to explore the role of prolonged cold exposure on adventitious rooting. We exposed plants to 4°C for different durations and scored the presence of adventitious roots on the main stem and axillary branches. Our physiological studies demonstrated the presence of adventitious roots after 21 weeks at 4°C saturating the effect of cold on this process. Notably, adventitious roots on the main stem developing in specific internodes allowed us to identify the gene regulatory network involved in the formation of adventitious roots in cold using transcriptomics. These data and histological studies indicated that adventitious roots in A. alpina stems initiate during cold exposure and emerge after plants experience growth promoting conditions. While the initiation of adventitious root was not associated with changes of DR5 auxin response and free endogenous auxin level in the stems, the emergence of the adventitious root primordia was. Using the transcriptomic data, we discerned the sequential hormone responses occurring in various stages of adventitious root formation and identified supplementary pathways putatively involved in adventitious root emergence, such as glucosinolate metabolism. Together, our results highlight the role of low temperature during clonal growth in alpine plants and provide insights on the molecular mechanisms involved at distinct stages of adventitious rooting.
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Affiliation(s)
- Priyanka Mishra
- Institute for Plant Sciences, University of Cologne, Cologne, Germany
- Cluster of Excellence on Plant Sciences, “SMART Plants for Tomorrow’s Needs,” Heinrich-Heine University Düsseldorf, Düsseldorf, Germany
- Max Planck Institute for Plant Breeding Research, Cologne, Germany
- Department of Botany, Faculty of Science, University of Allahabad, Prayagraj, India
| | - Adrian Roggen
- Institute for Plant Sciences, University of Cologne, Cologne, Germany
- Cluster of Excellence on Plant Sciences, “SMART Plants for Tomorrow’s Needs,” Heinrich-Heine University Düsseldorf, Düsseldorf, Germany
- Max Planck Institute for Plant Breeding Research, Cologne, Germany
| | - Karin Ljung
- Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Maria C. Albani
- Institute for Plant Sciences, University of Cologne, Cologne, Germany
- Cluster of Excellence on Plant Sciences, “SMART Plants for Tomorrow’s Needs,” Heinrich-Heine University Düsseldorf, Düsseldorf, Germany
- Max Planck Institute for Plant Breeding Research, Cologne, Germany
- Rijk Zwaan, De Lier, Netherlands
| | - Alice Vayssières
- Institute for Plant Sciences, University of Cologne, Cologne, Germany
- Cluster of Excellence on Plant Sciences, “SMART Plants for Tomorrow’s Needs,” Heinrich-Heine University Düsseldorf, Düsseldorf, Germany
- Max Planck Institute for Plant Breeding Research, Cologne, Germany
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
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4
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Quan L, Shiting L, Chen Z, Yuyan H, Minrong Z, Shuyan L, Libao C. NnWOX1-1, NnWOX4-3, and NnWOX5-1 of lotus (Nelumbo nucifera Gaertn)promote root formation and enhance stress tolerance in transgenic Arabidopsis thaliana. BMC Genomics 2023; 24:719. [PMID: 38017402 PMCID: PMC10683310 DOI: 10.1186/s12864-023-09772-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 10/28/2023] [Indexed: 11/30/2023] Open
Abstract
BACKGROUND Adventitious roots (ARs) represent an important organ system for water and nutrient uptake in lotus plants because of degeneration of the principal root. The WUSCHEL-related homeobox (WOX) gene regulates plant development and growth by affecting the expression of several other genes. In this study, three WOX genes, NnWOX1-1, NnWOX4-3, and NnWOX5-1, were isolated and their functions were assessed in Arabidopsis plants. RESULTS The full lengths of NnWOX1-1, NnWOX4-3, and NnWOX5-1 were 1038, 645, and 558 bp, encoding 362, 214, and 185 amino acid residues, respectively. Phylogenetic analysis classified NnWOX1-1 and NnWOX4-3 encoding proteins into one group, and NnWOX5-1 and MnWOX5 encoding proteins exhibited strong genetic relationships. The three genes were induced by sucrose and indoleacetic acid (IAA) and exhibited organ-specific expression characteristics. In addition to improving root growth and salt tolerance, NnWOX1-1 and NnWOX4-3 promoted stem development in transgenic Arabidopsis plants. A total of 751, 594, and 541 genes, including 19, 19, and 13 respective genes related to ethylene and IAA metabolism and responses, were enhanced in NnWOX1-1, NnWOX4-3, and NnWOX5-1 transgenic plants, respectively. Further analysis showed that ethylene production rates in transgenic plants increased, whereas IAA, peroxidase, and lignin content did not significantly change. Exogenous application of ethephon on lotus seedlings promoted AR formation and dramatically increased the fresh and dry weights of the plants. CONCLUSIONS NnWOX1-1, NnWOX4-3, and NnWOX5-1 influence root formation, stem development, and stress adaptation in transgenic Arabidopsis plants by affecting the transcription of multiple genes. Among these, changes in gene expression involving ethylene metabolism and responses likely critically affect the development of Arabidopsis plants. In addition, ethylene may represent an important factor affecting AR formation in lotus seedlings.
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Affiliation(s)
- Liu Quan
- College of Horticulture and landscape Architechture, Yangzhou University, Jiangsu, People's Republic of China
| | - Liang Shiting
- College of Horticulture and landscape Architechture, Yangzhou University, Jiangsu, People's Republic of China
| | - Zhao Chen
- College of Horticulture and landscape Architechture, Yangzhou University, Jiangsu, People's Republic of China
| | - Han Yuyan
- College of Horticulture and landscape Architechture, Yangzhou University, Jiangsu, People's Republic of China
| | - Zhao Minrong
- College of Horticulture and landscape Architechture, Yangzhou University, Jiangsu, People's Republic of China
| | - Li Shuyan
- College of Guangling, Yangzhou University, Jiangsu, People's Republic of China.
| | - Cheng Libao
- College of Horticulture and landscape Architechture, Yangzhou University, Jiangsu, People's Republic of China.
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5
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Goto C, Ikegami A, Goh T, Maruyama K, Kasahara H, Takebayashi Y, Kamiya Y, Toyokura K, Kondo Y, Ishizaki K, Mimura T, Fukaki H. Genetic Interaction between Arabidopsis SUR2/CYP83B1 and GNOM Indicates the Importance of Stabilizing Local Auxin Accumulation in Lateral Root Initiation. PLANT & CELL PHYSIOLOGY 2023; 64:1178-1188. [PMID: 37522618 DOI: 10.1093/pcp/pcad084] [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: 12/30/2022] [Revised: 07/25/2023] [Accepted: 07/28/2023] [Indexed: 08/01/2023]
Abstract
Lateral root (LR) formation is an important developmental event for the establishment of the root system in most vascular plants. In Arabidopsis thaliana, the fewer roots (fwr) mutation in the GNOM gene, encoding a guanine nucleotide exchange factor of ADP ribosylation factor that regulates vesicle trafficking, severely inhibits LR formation. Local accumulation of auxin response for LR initiation is severely affected in fwr. To better understand how local accumulation of auxin response for LR initiation is regulated, we identified a mutation, fewer roots suppressor1 (fsp1), that partially restores LR formation in fwr. The gene responsible for fsp1 was identified as SUPERROOT2 (SUR2), encoding CYP83B1 that positions at the metabolic branch point in the biosynthesis of auxin/indole-3-acetic acid (IAA) and indole glucosinolate. The fsp1 mutation increases both endogenous IAA levels and the number of the sites where auxin response locally accumulates prior to LR formation in fwr. SUR2 is expressed in the pericycle of the differentiation zone and in the apical meristem in roots. Time-lapse imaging of the auxin response revealed that local accumulation of auxin response is more stable in fsp1. These results suggest that SUR2/CYP83B1 affects LR founder cell formation at the xylem pole pericycle cells where auxin accumulates. Analysis of the genetic interaction between SUR2 and GNOM indicates the importance of stabilization of local auxin accumulation sites for LR initiation.
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Affiliation(s)
| | - Akira Ikegami
- Department of Biology, Graduate School of Science, Kobe University, 1-1 Rokkodai, Kobe, 657-8501 Japan
| | - Tatsuaki Goh
- Department of Biology, Graduate School of Science, Kobe University, 1-1 Rokkodai, Kobe, 657-8501 Japan
- Graduate School of Science and Technology, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, 630-0192 Japan
| | - Kaisei Maruyama
- Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, 183-8509 Japan
| | - Hiroyuki Kasahara
- Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, 183-8509 Japan
- RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, 230-0045 Japan
| | - Yumiko Takebayashi
- RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, 230-0045 Japan
| | - Yuji Kamiya
- RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, 230-0045 Japan
| | - Koichi Toyokura
- Department of Biology, Graduate School of Science, Kobe University, 1-1 Rokkodai, Kobe, 657-8501 Japan
- Graduate School of Integrated Science for Life, Hiroshima University, 1-4-3 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526 Japan
| | - Yuki Kondo
- Department of Biology, Graduate School of Science, Kobe University, 1-1 Rokkodai, Kobe, 657-8501 Japan
| | - Kimitsune Ishizaki
- Department of Biology, Graduate School of Science, Kobe University, 1-1 Rokkodai, Kobe, 657-8501 Japan
| | - Tetsuro Mimura
- Department of Biology, Graduate School of Science, Kobe University, 1-1 Rokkodai, Kobe, 657-8501 Japan
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-Ku, Tokyo, 113-8657 Japan
- College of Bioscience and Biotechnology, National Cheng Kung University, 1 University Road, Tainan 701, Taiwan
| | - Hidehiro Fukaki
- Department of Biology, Graduate School of Science, Kobe University, 1-1 Rokkodai, Kobe, 657-8501 Japan
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6
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Shin D, Perez VC, Dickinson GK, Zhao H, Dai R, Tomiczek B, Cho KH, Zhu N, Koh J, Grenning A, Kim J. Altered methionine metabolism impacts phenylpropanoid production and plant development in Arabidopsis thaliana. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2023; 116:187-200. [PMID: 37366635 DOI: 10.1111/tpj.16370] [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: 01/17/2023] [Accepted: 06/20/2023] [Indexed: 06/28/2023]
Abstract
Phenylpropanoids are specialized metabolites derived from phenylalanine. Glucosinolates are defense compounds derived mainly from methionine and tryptophan in Arabidopsis. It was previously shown that the phenylpropanoid pathway and glucosinolate production are metabolically linked. The accumulation of indole-3-acetaldoxime (IAOx), the precursor of tryptophan-derived glucosinolates, represses phenylpropanoid biosynthesis through accelerated degradation of phenylalanine ammonia lyase (PAL). As PAL functions at the entry point of the phenylpropanoid pathway, which produces indispensable specialized metabolites such as lignin, aldoxime-mediated phenylpropanoid repression is detrimental to plant survival. Although methionine-derived glucosinolates in Arabidopsis are abundant, any impact of aliphatic aldoximes (AAOx) derived from aliphatic amino acids such as methionine on phenylpropanoid production remains unclear. Here, we investigate the impact of AAOx accumulation on phenylpropanoid production using Arabidopsis aldoxime mutants, ref2 and ref5. REF2 and REF5 metabolize aldoximes to respective nitrile oxides redundantly, but with different substrate specificities. ref2 and ref5 mutants have decreased phenylpropanoid contents due to the accumulation of aldoximes. As REF2 and REF5 have high substrate specificity toward AAOx and IAOx, respectively, it was assumed that ref2 accumulates AAOx, not IAOx. Our study indicates that ref2 accumulates both AAOx and IAOx. Removing IAOx partially restored phenylpropanoid content in ref2, but not to the wild-type level. However, when AAOx biosynthesis was silenced, phenylpropanoid production and PAL activity in ref2 were completely restored, suggesting an inhibitory effect of AAOx on phenylpropanoid production. Further feeding studies revealed that the abnormal growth phenotype commonly observed in Arabidopsis mutants lacking AAOx production is a consequence of methionine accumulation.
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Affiliation(s)
- Doosan Shin
- Horticultural Sciences Department, University of Florida, Gainesville, FL, 32611, USA
| | - Veronica C Perez
- Plant Molecular and Cellular Biology Graduate Program, University of Florida, Gainesville, FL, USA
| | - Gabriella K Dickinson
- Plant Molecular and Cellular Biology Graduate Program, University of Florida, Gainesville, FL, USA
| | - Haohao Zhao
- Horticultural Sciences Department, University of Florida, Gainesville, FL, 32611, USA
| | - Ru Dai
- Horticultural Sciences Department, University of Florida, Gainesville, FL, 32611, USA
| | - Breanna Tomiczek
- Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
| | - Keun Ho Cho
- Horticultural Sciences Department, University of Florida, Gainesville, FL, 32611, USA
| | - Ning Zhu
- Interdisciplinary Center for Biotechnology Research, University of Florida, Gainesville, FL, 32611, USA
| | - Jin Koh
- Interdisciplinary Center for Biotechnology Research, University of Florida, Gainesville, FL, 32611, USA
| | - Alexander Grenning
- Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
| | - Jeongim Kim
- Horticultural Sciences Department, University of Florida, Gainesville, FL, 32611, USA
- Plant Molecular and Cellular Biology Graduate Program, University of Florida, Gainesville, FL, USA
- Genetic Institute, University of Florida, Gainesville, FL, USA
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7
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Shin D, Perez VC, Dickinson GK, Zhao H, Dai R, Tomiczek B, Cho KH, Zhu N, Koh J, Grenning A, Kim J. Altered methionine metabolism impacts phenylpropanoid production and plant development in Arabidopsis thaliana. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.29.542770. [PMID: 37398371 PMCID: PMC10312446 DOI: 10.1101/2023.05.29.542770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
Phenylpropanoids are specialized metabolites derived from phenylalanine. Glucosinolates are defense compounds derived mainly from methionine and tryptophan in Arabidopsis. It was previously shown that the phenylpropanoid pathway and glucosinolate production are metabolically linked. The accumulation of indole-3-acetaldoxime (IAOx), the precursor of tryptophan-derived glucosinolates, represses phenylpropanoid biosynthesis through accelerated degradation of phenylalanine-ammonia lyase (PAL). As PAL functions at the entry point of the phenylpropanoid pathway which produces indispensable specialized metabolites such as lignin, aldoxime-mediated phenylpropanoid repression is detrimental to plant survival. Although methionine-derived glucosinolates in Arabidopsis are abundant, any impact of aliphatic aldoximes (AAOx) derived from aliphatic amino acids such as methionine on phenylpropanoid production remains unclear. Here, we investigate the impact of AAOx accumulation on phenylpropanoid production using Arabidopsis aldoxime mutants, ref2 and ref5 . REF2 and REF5 metabolize aldoximes to respective nitrile oxides redundantly, but with different substrate specificities. ref2 and ref5 mutants have decreased phenylpropanoid contents due to the accumulation of aldoximes. As REF2 and REF5 have high substrate specificity toward AAOx and IAOx respectively, it was assumed that ref2 accumulates AAOx, not IAOx. Our study indicates that ref2 accumulates both AAOx and IAOx. Removing IAOx partially restored phenylpropanoid production in ref2 , but not to the wild-type level. However, when AAOx biosynthesis was silenced, phenylpropanoid production and PAL activity in ref2 were completely restored, suggesting an inhibitory effect of AAOx on phenylpropanoid production. Further feeding studies revealed that the abnormal growth phenotype commonly observed in Arabidopsis mutants lacking AAOx production is a consequence of methionine accumulation. Significance Statement Aliphatic aldoximes are precursors of various specialized metabolites including defense compounds. This study reveals that aliphatic aldoximes repress phenylpropanoid production and that altered methionine metabolism affects plant growth and development. As phenylpropanoids include vital metabolites such as lignin, a major sink of fixed carbon, this metabolic link may contribute to available resource allocation during defense.
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8
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Lee KW, Chen JJW, Wu CS, Chang HC, Chen HY, Kuo HH, Lee YS, Chang YL, Chang HC, Shiue SY, Wu YC, Ho YC, Chen PW. Auxin plays a role in the adaptation of rice to anaerobic germination and seedling establishment. PLANT, CELL & ENVIRONMENT 2023; 46:1157-1175. [PMID: 36071575 DOI: 10.1111/pce.14434] [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: 05/16/2022] [Revised: 08/17/2022] [Accepted: 08/25/2022] [Indexed: 06/15/2023]
Abstract
Auxin is well known to stimulate coleoptile elongation and rapid seedling growth in the air. However, its role in regulating rice germination and seedling establishment under submergence is largely unknown. Previous studies revealed that excessive levels of indole-3-acetic acid(IAA) frequently cause the inhibition of plant growth and development. In this study, the high-level accumulation of endogenous IAA is observed under dark submergence, stimulating rice coleoptile elongation but limiting the root and primary leaf growth during anaerobic germination (AG). We found that oxygen and light can reduce IAA levels, promote the seedling establishment and enhance rice AG tolerance. miRNA microarray profiling and RNA gel blot analysis results show that the expression of miR167 is negatively regulated by submergence; it subsequently modulates the accumulation of free IAA through the miR167-ARF-GH3 pathway. The OsGH3-8 encodes an IAA-amido synthetase that functions to prevent free IAA accumulation. Reduced miR167 levels or overexpressing OsGH3-8 increase auxin metabolism, reduce endogenous levels of free IAA and enhance rice AG tolerance. Our studies reveal that poor seed germination and seedling growth inhibition resulting from excessive IAA accumulation would cause intolerance to submergence in rice, suggesting that a certain threshold level of auxin is essential for rice AG tolerance.
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Affiliation(s)
- Kuo-Wei Lee
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi, Taiwan
| | - Jeremy J W Chen
- Institute of Biomedical Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Chung-Shen Wu
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi, Taiwan
| | - Ho-Chun Chang
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi, Taiwan
| | - Hong-Yue Chen
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi, Taiwan
| | - Hsin-Hao Kuo
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi, Taiwan
| | - Ya-Shan Lee
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi, Taiwan
| | - Yan-Lun Chang
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi, Taiwan
| | - Hung-Chia Chang
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi, Taiwan
| | - Shiau-Yu Shiue
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi, Taiwan
| | - Yi-Chen Wu
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi, Taiwan
| | - Yi-Cheng Ho
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi, Taiwan
| | - Peng-Wen Chen
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi, Taiwan
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Modrego A, Pasternak T, Omary M, Albacete A, Cano A, Pérez-Pérez JM, Efroni I. Mapping of the Classical Mutation rosette Highlights a Role for Calcium in Wound-Induced Rooting. PLANT & CELL PHYSIOLOGY 2023; 64:152-164. [PMID: 36398993 DOI: 10.1093/pcp/pcac163] [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: 01/10/2022] [Revised: 11/14/2022] [Accepted: 11/17/2022] [Indexed: 06/16/2023]
Abstract
Removal of the root system induces the formation of new roots from the remaining shoot. This process is primarily controlled by the phytohormone auxin, which interacts with other signals in a yet unresolved manner. Here, we study the classical tomato mutation rosette (ro), which lacks shoot-borne roots. ro mutants were severely inhibited in formation of wound-induced roots (WiRs) and had reduced auxin transport rates. We mapped ro to the tomato ortholog of the Arabidopsis thaliana BIG and the mammalians UBR4/p600. RO/BIG is a large protein of unknown biochemical function. In A. thaliana, BIG was implicated in regulating auxin transport and calcium homeostasis. We show that exogenous calcium inhibits WiR formation in tomato and A. thaliana ro/big mutants. Exogenous calcium antagonized the root-promoting effects of the auxin indole-3-acetic-acid but not of 2,4-dichlorophenoxyacetic acid, an auxin analog that is not recognized by the polar transport machinery, and accumulation of the auxin transporter PIN-FORMED1 (PIN1) was sensitive to calcium levels in the ro/big mutants. Consistent with a role for calcium in mediating auxin transport, both ro/big mutants and calcium-treated wild-type plants were hypersensitive to treatment with polar auxin transport inhibitors. Subcellular localization of BIG suggests that, like its mammalian ortholog, it is associated with the endoplasmic reticulum. Analysis of subcellular morphology revealed that ro/big mutants exhibited disruption in cytoplasmic streaming. We suggest that RO/BIG maintains auxin flow by stabilizing PIN membrane localization, possibly by attenuating the inhibitory effect of Ca2+ on cytoplasmic streaming.
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Affiliation(s)
- Abelardo Modrego
- The Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agriculture, The Hebrew University, Rehovot 7610001, Israel
| | - Taras Pasternak
- Instituto de Bioingeniería, Universidad Miguel Hernández, Elche 03202, Spain
| | - Moutasem Omary
- The Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agriculture, The Hebrew University, Rehovot 7610001, Israel
| | - Alfonso Albacete
- Departamento de Nutrición Vegetal, CEBAS-CSIC, Murcia 30100, Spain
| | - Antonio Cano
- Departamento de Biología Vegetal (Fisiología Vegetal), Universidad de Murcia, Murcia 30100, Spain
| | | | - Idan Efroni
- The Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agriculture, The Hebrew University, Rehovot 7610001, Israel
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10
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Czerniawski P, Piślewska-Bednarek M, Piasecka A, Kułak K, Bednarek P. Loss of MYB34 Transcription Factor Supports the Backward Evolution of Indole Glucosinolate Biosynthesis in a Subclade of the Camelineae Tribe and Releases the Feedback Loop in This Pathway in Arabidopsis. PLANT & CELL PHYSIOLOGY 2023; 64:80-93. [PMID: 36222356 DOI: 10.1093/pcp/pcac142] [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: 07/08/2022] [Revised: 08/12/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Abstract
Glucosinolates are specialized defensive metabolites characteristic of the Brassicales order. Among them, aliphatic and indolic glucosinolates (IGs) are usually highly abundant in species from the Brassicaceae family. The exceptions this trend are species representing a subclade of the Camelineae tribe, including Capsella and Camelina genera, which have reduced capacity to produce and metabolize IGs. Our study addresses the contribution of specific glucosinolate-related myeloblastosis (MYB) transcription factors to this unprecedented backward evolution of IG biosynthesis. To this end, we performed phylogenomic and functional studies of respective MYB proteins. The obtained results revealed weakened conservation of glucosinolate-related MYB transcription factors, including loss of functional MYB34 protein, in the investigated species. We showed that the introduction of functional MYB34 from Arabidopsis thaliana partially restores IG biosynthesis in Capsella rubella, indicating that the loss of this transcription factor contributes to the backward evolution of this metabolic pathway. Finally, we performed an analysis of the impact of particular myb mutations on the feedback loop in IG biosynthesis, which drives auxin overproduction, metabolic dysregulation and strong growth retardation caused by mutations in IG biosynthetic genes. This uncovered the unique function of MYB34 among IG-related MYBs in this feedback regulation and consequently in IG conservation in Brassicaceae plants.
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Affiliation(s)
- Paweł Czerniawski
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Noskowskiego 12/14, Poznań 61-704, Poland
| | - Mariola Piślewska-Bednarek
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Noskowskiego 12/14, Poznań 61-704, Poland
| | - Anna Piasecka
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Noskowskiego 12/14, Poznań 61-704, Poland
- Institute of Plant Genetics, Polish Academy of Sciences, Strzeszyńska 34, Poznań 60-479, Poland
| | - Karolina Kułak
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Noskowskiego 12/14, Poznań 61-704, Poland
- Department of General Botany, Institute of Experimental Biology, Adam Mickiewicz University, Uniwersytetu Poznańskiego 6, Poznań 61-614, Poland
| | - Paweł Bednarek
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Noskowskiego 12/14, Poznań 61-704, Poland
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11
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Significance of NatB-mediated N-terminal acetylation of auxin biosynthetic enzymes in maintaining auxin homeostasis in Arabidopsis thaliana. Commun Biol 2022; 5:1410. [PMID: 36550195 PMCID: PMC9780221 DOI: 10.1038/s42003-022-04313-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 11/29/2022] [Indexed: 12/24/2022] Open
Abstract
The auxin IAA (Indole-3-acetic acid) plays key roles in regulating plant growth and development, which depends on an intricate homeostasis that is determined by the balance between its biosynthesis, metabolism and transport. YUC flavin monooxygenases catalyze the rate-limiting step of auxin biosynthesis via IPyA (indole pyruvic acid) and are critical targets in regulating auxin homeostasis. Despite of numerous reports on the transcriptional regulation of YUC genes, little is known about those at the post-translational protein level. Here, we show that loss of function of CKRC3/TCU2, the auxiliary subunit (Naa25) of Arabidopsis NatB, and/or of its catalytic subunit (Naa20), NBC, led to auxin-deficiency in plants. Experimental evidences show that CKRC3/TCU2 can interact with NBC to form a NatB complex, catalyzing the N-terminal acetylation (NTA) of YUC proteins for their intracellular stability to maintain normal auxin homeostasis in plants. Hence, our findings provide significantly new insight into the link between protein NTA and auxin biosynthesis in plants.
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12
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Jun SE, Cho KH, Manzoor MA, Hwang TY, Kim YS, Schaffrath R, Kim GT. AtELP4 a subunit of the Elongator complex in Arabidopsis, mediates cell proliferation and dorsoventral polarity during leaf morphogenesis. FRONTIERS IN PLANT SCIENCE 2022; 13:1033358. [PMID: 36340367 PMCID: PMC9634574 DOI: 10.3389/fpls.2022.1033358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 09/20/2022] [Indexed: 06/16/2023]
Abstract
The Elongator complex in eukaryotes has conserved tRNA modification functions and contributes to various physiological processes such as transcriptional control, DNA replication and repair, and chromatin accessibility. ARABIDOPSIS ELONGATOR PROTEIN 4 (AtELP4) is one of the six subunits (AtELP1-AtELP6) in Arabidopsis Elongator. In addition, there is an Elongator-associated protein, DEFORMED ROOTS AND LEAVES 1 (DRL1), whose homolog in yeast (Kti12) binds tRNAs. In this study, we explored the functions of AtELP4 in plant-specific aspects such as leaf morphogenesis and evolutionarily conserved ones between yeast and Arabidopsis. ELP4 comparison between yeast and Arabidopsis revealed that plant ELP4 possesses not only a highly conserved P-loop ATPase domain but also unknown plant-specific motifs. ELP4 function is partially conserved between Arabidopsis and yeast in the growth sensitivity toward caffeine and elevated cultivation temperature. Either single Atelp4 or drl1-102 mutants and double Atelp4 drl1-102 mutants exhibited a reduction in cell proliferation and changed the adaxial-abaxial polarity of leaves. In addition, the single Atelp4 and double Atelp4 drl1-102 mutants showed remarkable downward curling at the whole part of leaf blades in contrast to wild-type leaf blades. Furthermore, our genetic study revealed that AtELP4 might epistatically act on DRL1 in the regulation of cell proliferation and dorsoventral polarity in leaves. Taken together, we suggest that AtELP4 as part of the plant Elongator complex may act upstream of a regulatory pathway for adaxial-abaxial polarity and cell proliferation during leaf development.
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Affiliation(s)
- Sang Eun Jun
- Department of Molecular Genetics, Dong-A University, Busan, South Korea
| | - Kiu-Hyung Cho
- Department of Molecular Genetics, Dong-A University, Busan, South Korea
| | | | - Tae Young Hwang
- Graduate School of Applied Bioscience, Dong-A University, Busan, South Korea
| | - Youn Soo Kim
- Graduate School of Applied Bioscience, Dong-A University, Busan, South Korea
| | - Raffael Schaffrath
- Institut für Biologie, Fachgebiet Mikrobiologie, Universität Kassel, Kassel, Germany
| | - Gyung-Tae Kim
- Department of Molecular Genetics, Dong-A University, Busan, South Korea
- Graduate School of Applied Bioscience, Dong-A University, Busan, South Korea
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13
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Qiao L, Zhang T, Yang H, Yang S, Wang J. Overexpression of a SHORT-ROOT transcriptional factor enhances the auxin mediated formation of adventitious roots and lateral roots in poplar trees. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2022; 323:111408. [PMID: 35932828 DOI: 10.1016/j.plantsci.2022.111408] [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: 06/01/2022] [Revised: 07/31/2022] [Accepted: 08/02/2022] [Indexed: 06/15/2023]
Abstract
SHORT-ROOT (SHR) defines root stem cells and maintains radial patterning, but its involvement in adventitious root (AR) formation has not been reported. In this study, we showed that PtSHR2 was transcriptionally upregulated by excision before the formation of AR and responded dynamically to auxin. PtSHR2 overexpression (SHR2BOE) in hybrid poplars resulted in an increased number of ARs with an initial delay. Despite a lower endogenous content in the stems than in wild-type plants, indole-3-acetic acid (IAA) content at the SHR2BOE basal stem increased rapidly after cutting and reached a higher maximum than in wild-type plants, which was accompanied by a more sustained and stronger induction of AR formation marker genes. In addition, the higher auxin content in SHR2BOE ARs resulted in more and longer lateral roots (LRs). Application of auxin abolished the early delay in the formation of AR and largely other AR phenotypes of SHR2BOE plants, whereas the polar auxin transport inhibitor N-1-naphthylphthalamic acid completely inhibited both AR and LR abnormalities. Since the enhanced rooting ability of SHR2BOE stem cuttings in hydroponics was clearly confirmed, our results suggest a novel role of poplar SHR2 as a positive regulator during the organogenesis of AR and LR by affecting local auxin homeostasis.
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Affiliation(s)
- Linxiang Qiao
- School of Environmental Science and Engineering, Tianjin University, Weijin Rd. 92, Nankai District, Tianjin 300072, China..
| | - Tianjiao Zhang
- School of Environmental Science and Engineering, Tianjin University, Weijin Rd. 92, Nankai District, Tianjin 300072, China..
| | - Heyu Yang
- School of Environmental Science and Engineering, Tianjin University, Weijin Rd. 92, Nankai District, Tianjin 300072, China..
| | - Shaohui Yang
- School of Environmental Science and Engineering, Tianjin University, Weijin Rd. 92, Nankai District, Tianjin 300072, China..
| | - Jiehua Wang
- School of Environmental Science and Engineering, Tianjin University, Weijin Rd. 92, Nankai District, Tianjin 300072, China..
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14
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Dai X, Zhang S, Liu S, Qi H, Duan X, Han Z, Wang J. Functional Characterization and Phenotyping of Protoplasts on a Microfluidics-Based Flow Cytometry. BIOSENSORS 2022; 12:bios12090688. [PMID: 36140072 PMCID: PMC9496511 DOI: 10.3390/bios12090688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 08/23/2022] [Accepted: 08/24/2022] [Indexed: 11/16/2022]
Abstract
A better understanding of the phenotypic heterogeneity of protoplasts requires a comprehensive analysis of the morphological and metabolic characteristics of many individual cells. In this study, we developed a microfluidic flow cytometry with fluorescence sensor for functional characterization and phenotyping of protoplasts to allow an unbiased assessment of the influence of environmental factors at the single cell level. First, based on the measurement of intracellular homeostasis of reactive oxygen species (ROS) with a DCFH-DA dye, the effects of various external stress factors such as H2O2, temperature, ultraviolet (UV) light, and cadmium ions on intracellular ROS accumulation in Arabidopsis mesophyll protoplasts were quantitatively investigated. Second, a faster and stronger oxidative burst was observed in Petunia protoplasts isolated from white petals than in those isolated from purple petals, demonstrating the photoprotective role of anthocyanins. Third, using mutants with different endogenous auxin, we demonstrated the beneficial effect of auxin during the process of primary cell wall regeneration. Moreover, UV-B irradiation has a similar accelerating effect by increasing the intracellular auxin level, as shown by double fluorescence channels. In summary, our work has revealed previously underappreciated phenotypic variability within a protoplast population and demonstrated the advantages of a microfluidic flow cytometry for assessing the in vivo dynamics of plant metabolic and physiological indices at the single-cell level.
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Affiliation(s)
- Xingda Dai
- School of Environmental Science and Engineering, Tianjin University, Weijin Rd. 92, Tianjin 300072, China
| | - Shuaihua Zhang
- State Key Laboratory of Precision Measuring Technology and Instruments, College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Weijin Rd. 92, Tianjin 300072, China
| | - Siyuan Liu
- State Key Laboratory of Precision Measuring Technology and Instruments, College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Weijin Rd. 92, Tianjin 300072, China
| | - Hang Qi
- State Key Laboratory of Precision Measuring Technology and Instruments, College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Weijin Rd. 92, Tianjin 300072, China
| | - Xuexin Duan
- State Key Laboratory of Precision Measuring Technology and Instruments, College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Weijin Rd. 92, Tianjin 300072, China
| | - Ziyu Han
- State Key Laboratory of Precision Measuring Technology and Instruments, College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Weijin Rd. 92, Tianjin 300072, China
- Correspondence: (Z.H.); (J.W.)
| | - Jiehua Wang
- School of Environmental Science and Engineering, Tianjin University, Weijin Rd. 92, Tianjin 300072, China
- Correspondence: (Z.H.); (J.W.)
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15
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Zhao H, Wang Y, Zhao S, Fu Y, Zhu L. HOMEOBOX PROTEIN 24 mediates the conversion of indole-3-butyric acid to indole-3-acetic acid to promote root hair elongation. THE NEW PHYTOLOGIST 2021; 232:2057-2070. [PMID: 34480752 DOI: 10.1111/nph.17719] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 08/26/2021] [Indexed: 06/13/2023]
Abstract
Indole-3-acetic acid (IAA) is a predominant form of active auxin in plants. In addition to de novo biosynthesis and release from its conjugate forms, IAA can be converted from its precursor indole-3-butyric acid (IBA). The IBA-derived IAA may help drive root hair elongation in Arabidopsis thaliana seedlings, but how the IBA-to-IAA conversion is regulated and affects IAA function requires further investigation. In this study, HOMEOBOX PROTEIN 24 (HB24), a transcription factor in the zinc finger-homeodomain family (ZF-HD family) of proteins, was identified. With loss of HB24 function, defective growth occurred in root hairs. INDOLE-3-BUTYRIC ACID RESPONSE 1 (IBR1), which encodes an enzyme involved in the IBA-to-IAA conversion, was identified as a direct target of HB24 for the control of root hair elongation. The exogenous IAA or auxin analogue 1-naphthalene acetic acid (NAA) both rescued the root hair growth phenotype of hb24 mutants, but IBA did not, suggesting a role for HB24 in the IBA-to-IAA conversion. Therefore, HB24 participates in root hair elongation by upregulating the expression of IBR1 and subsequently promoting the IBA-to-IAA conversion. Moreover, IAA also elevated the expression of HB24, suggesting a feedback loop is involved in IBA-to-IAA conversion-mediated root hair elongation.
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Affiliation(s)
- Huan Zhao
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Yutao Wang
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Shuai Zhao
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Ying Fu
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Lei Zhu
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
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16
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Sharif R, Raza A, Chen P, Li Y, El-Ballat EM, Rauf A, Hano C, El-Esawi MA. HD-ZIP Gene Family: Potential Roles in Improving Plant Growth and Regulating Stress-Responsive Mechanisms in Plants. Genes (Basel) 2021; 12:genes12081256. [PMID: 34440430 PMCID: PMC8394574 DOI: 10.3390/genes12081256] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 08/06/2021] [Accepted: 08/12/2021] [Indexed: 12/11/2022] Open
Abstract
Exploring the molecular foundation of the gene-regulatory systems underlying agronomic parameters or/and plant responses to both abiotic and biotic stresses is crucial for crop improvement. Thus, transcription factors, which alone or in combination directly regulated the targeted gene expression levels, are appropriate players for enlightening agronomic parameters through genetic engineering. In this regard, homeodomain leucine zipper (HD-ZIP) genes family concerned with enlightening plant growth and tolerance to environmental stresses are considered key players for crop improvement. This gene family containing HD and LZ domain belongs to the homeobox superfamily. It is further classified into four subfamilies, namely HD-ZIP I, HD-ZIP II, HD-ZIP III, and HD-ZIP IV. The first HD domain-containing gene was discovered in maize cells almost three decades ago. Since then, with advanced technologies, these genes were functionally characterized for their distinct roles in overall plant growth and development under adverse environmental conditions. This review summarized the different functions of HD-ZIP genes in plant growth and physiological-related activities from germination to fruit development. Additionally, the HD-ZIP genes also respond to various abiotic and biotic environmental stimuli by regulating defense response of plants. This review, therefore, highlighted the various significant aspects of this important gene family based on the recent findings. The practical application of HD-ZIP biomolecules in developing bioengineered plants will not only mitigate the negative effects of environmental stresses but also increase the overall production of crop plants.
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Affiliation(s)
- Rahat Sharif
- Department of Horticulture, College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China;
- College of Horticulture, Northwest A&F University, Yangling 712100, China
| | - Ali Raza
- Fujian Provincial Key Laboratory of Crop Molecular and Cell Biology, Oil Crops Research Institute, Center of Legume Crop Genetics and Systems Biology, College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Oil Crops Research Institute, Chinese Academy of Agriculture Science (CAAS), Wuhan 430062, China
| | - Peng Chen
- College of Life Science, Northwest A&F University, Yangling 712100, China;
| | - Yuhong Li
- College of Horticulture, Northwest A&F University, Yangling 712100, China
- Correspondence: (Y.L.); (M.A.E.-E.)
| | - Enas M. El-Ballat
- Botany Department, Faculty of Science, Tanta University, Tanta 31527, Egypt;
| | - Abdur Rauf
- Department of Chemistry, University of Swabi, Anbar 23430, Pakistan;
| | - Christophe Hano
- Laboratoire de Biologie des Ligneux et des Grandes Cultures (LBLGC), INRAE USC1328, Université d’Orléans, 28000 Chartres, France;
| | - Mohamed A. El-Esawi
- Botany Department, Faculty of Science, Tanta University, Tanta 31527, Egypt;
- Correspondence: (Y.L.); (M.A.E.-E.)
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17
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Joshi M, Ginzberg I. Adventitious root formation in crops-Potato as an example. PHYSIOLOGIA PLANTARUM 2021; 172:124-133. [PMID: 33305392 DOI: 10.1111/ppl.13305] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Revised: 10/28/2020] [Accepted: 12/07/2020] [Indexed: 06/12/2023]
Abstract
The root system of potato is made up of adventitious roots (AR) that form at the base of a sprout once it emerges from the mother tuber. By definition, AR originate from dormant preformed meristems, or from cells neighboring vascular tissues in stems or leaves. This may occur as part of the developmental program of the plant (e.g., potato), or when replacing the embryonic primary roots in response to stress conditions, such as flooding, nutrient deprivation, or wounding. AR formation is studied mainly in cereals and model plants, and less is known about its developmental program in root and tuber crops. In this review, we summarize the recent data on AR development in potato and relate this knowledge to what is known from model plants. For example, AR formation following stem cutting in potato follows a pattern of initiation, expression, and emergence phases that are known for other plants and involves auxin, the master regulator of AR induction and development. Molecular regulation of AR formation and the effect of environmental stresses are discussed. Understanding the origin and nature of AR systems in important crops will contribute to increased production and improve global food security.
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Affiliation(s)
- Mukul Joshi
- Department of Biological Sciences, Birla Institute of Technology and Science, Pilani, India
| | - Idit Ginzberg
- Institute of Plant Sciences, Agricultural Research Organization, Volcani Center, Rishon LeZion, Israel
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18
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Casanova-Sáez R, Mateo-Bonmatí E, Ljung K. Auxin Metabolism in Plants. Cold Spring Harb Perspect Biol 2021; 13:cshperspect.a039867. [PMID: 33431579 PMCID: PMC7919392 DOI: 10.1101/cshperspect.a039867] [Citation(s) in RCA: 78] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The major natural auxin in plants, indole-3-acetic acid (IAA), orchestrates a plethora of developmental responses that largely depend on the formation of auxin concentration gradients within plant tissues. Together with inter- and intracellular transport, IAA metabolism-which comprises biosynthesis, conjugation, and degradation-modulates auxin gradients and is therefore critical for plant growth. It is now very well established that IAA is mainly produced from Trp and that the IPyA pathway is a major and universally conserved biosynthetic route in plants, while other redundant pathways operate in parallel. Recent findings have shown that metabolic inactivation of IAA is also redundantly performed by oxidation and conjugation processes. An exquisite spatiotemporal expression of the genes for auxin synthesis and inactivation have been shown to drive several plant developmental processes. Moreover, a group of transcription factors and epigenetic regulators controlling the expression of auxin metabolic genes have been identified in past years, which are illuminating the road to understanding the molecular mechanisms behind the coordinated responses of local auxin metabolism to specific cues. Besides transcriptional regulation, subcellular compartmentalization of the IAA metabolism and posttranslational modifications of the metabolic enzymes are emerging as important contributors to IAA homeostasis. In this review, we summarize the current knowledge on (1) the pathways for IAA biosynthesis and inactivation in plants, (2) the influence of spatiotemporally regulated IAA metabolism on auxin-mediated responses, and (3) the regulatory mechanisms that modulate IAA levels in response to external and internal cues during plant development.
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Affiliation(s)
| | | | - Karin Ljung
- Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden
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19
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Accumulation of the Auxin Precursor Indole-3-Acetamide Curtails Growth through the Repression of Ribosome-Biogenesis and Development-Related Transcriptional Networks. Int J Mol Sci 2021; 22:ijms22042040. [PMID: 33670805 PMCID: PMC7923163 DOI: 10.3390/ijms22042040] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 02/16/2021] [Accepted: 02/17/2021] [Indexed: 12/17/2022] Open
Abstract
The major auxin, indole-3-acetic acid (IAA), is associated with a plethora of growth and developmental processes including embryo development, expansion growth, cambial activity, and the induction of lateral root growth. Accumulation of the auxin precursor indole-3-acetamide (IAM) induces stress related processes by stimulating abscisic acid (ABA) biosynthesis. How IAM signaling is controlled is, at present, unclear. Here, we characterize the ami1rooty double mutant, that we initially generated to study the metabolic and phenotypic consequences of a simultaneous genetic blockade of the indole glucosinolate and IAM pathways in Arabidopsisthaliana. Our mass spectrometric analyses of the mutant revealed that the combination of the two mutations is not sufficient to fully prevent the conversion of IAM to IAA. The detected strong accumulation of IAM was, however, recognized to substantially impair seed development. We further show by genome-wide expression studies that the double mutant is broadly affected in its translational capacity, and that a small number of plant growth regulating transcriptional circuits are repressed by the high IAM content in the seed. In accordance with the previously described growth reduction in response to elevated IAM levels, our data support the hypothesis that IAM is a growth repressing counterpart to IAA.
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20
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Pérez-Alonso MM, Ortiz-García P, Moya-Cuevas J, Lehmann T, Sánchez-Parra B, Björk RG, Karim S, Amirjani MR, Aronsson H, Wilkinson MD, Pollmann S. Endogenous indole-3-acetamide levels contribute to the crosstalk between auxin and abscisic acid, and trigger plant stress responses in Arabidopsis. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:459-475. [PMID: 33068437 PMCID: PMC7853601 DOI: 10.1093/jxb/eraa485] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 10/13/2020] [Indexed: 05/13/2023]
Abstract
The evolutionary success of plants relies to a large extent on their extraordinary ability to adapt to changes in their environment. These adaptations require that plants balance their growth with their stress responses. Plant hormones are crucial mediators orchestrating the underlying adaptive processes. However, whether and how the growth-related hormone auxin and the stress-related hormones jasmonic acid, salicylic acid, and abscisic acid (ABA) are coordinated remains largely elusive. Here, we analyse the physiological role of AMIDASE 1 (AMI1) in Arabidopsis plant growth and its possible connection to plant adaptations to abiotic stresses. AMI1 contributes to cellular auxin homeostasis by catalysing the conversion of indole-acetamide into the major plant auxin indole-3-acetic acid. Functional impairment of AMI1 increases the plant's stress status rendering mutant plants more susceptible to abiotic stresses. Transcriptomic analysis of ami1 mutants disclosed the reprogramming of a considerable number of stress-related genes, including jasmonic acid and ABA biosynthesis genes. The ami1 mutants exhibit only moderately repressed growth but an enhanced ABA accumulation, which suggests a role for AMI1 in the crosstalk between auxin and ABA. Altogether, our results suggest that AMI1 is involved in coordinating the trade-off between plant growth and stress responses, balancing auxin and ABA homeostasis.
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Affiliation(s)
- Marta-Marina Pérez-Alonso
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM) – Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Pozuelo de Alarcón, Spain
| | - Paloma Ortiz-García
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM) – Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Pozuelo de Alarcón, Spain
| | - José Moya-Cuevas
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM) – Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Pozuelo de Alarcón, Spain
| | - Thomas Lehmann
- Lehrstuhl für Pflanzenphysiologie, Ruhr-Universität Bochum, Bochum, Germany
| | - Beatriz Sánchez-Parra
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM) – Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Pozuelo de Alarcón, Spain
- Current address: Max-Planck-Institute for Chemistry, Mainz, Germany
| | - Robert G Björk
- Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden
- Gothenburg Global Biodiversity Centre, Gothenburg, Sweden
| | - Sazzad Karim
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
- Department of Infectious Diseases, Institute of Biomedicine, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Mohammad R Amirjani
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
- Current address: Department of Biology, Arak University, Arak, Iran
| | - Henrik Aronsson
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Mark D Wilkinson
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM) – Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Pozuelo de Alarcón, Spain
| | - Stephan Pollmann
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM) – Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Pozuelo de Alarcón, Spain
- Departamento de Biotecnología-Biología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, Universidad Politécnica de Madrid (UPM), Madrid, Spain
- Correspondence:
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21
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Li SW. Molecular Bases for the Regulation of Adventitious Root Generation in Plants. FRONTIERS IN PLANT SCIENCE 2021; 12:614072. [PMID: 33584771 PMCID: PMC7876083 DOI: 10.3389/fpls.2021.614072] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Accepted: 01/08/2021] [Indexed: 05/08/2023]
Abstract
The formation of adventitious roots (ARs) is an ecologically and economically important developmental process in plants. The evolution of AR systems is an important way for plants to cope with various environmental stresses. This review focuses on identified genes that have known to regulate the induction and initiation of ARs and offers an analysis of this process at the molecular level. The critical genes involved in adventitious rooting are the auxin signaling-responsive genes, including the AUXIN RESPONSE FACTOR (ARF) and the LATERAL ORGAN BOUNDARIES-DOMAIN (LOB) gene families, and genes associated with auxin transport and homeostasis, the quiescent center (QC) maintenance, and the root apical meristem (RAM) initiation. Several genes involved in cell wall modulation are also known to be involved in the regulation of adventitious rooting. Furthermore, the molecular processes that play roles in the ethylene, cytokinin, and jasmonic acid signaling pathways and their crosstalk modulate the generation of ARs. The crosstalk and interaction among many molecular processes generates complex networks that regulate AR generation.
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22
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Garrido AN, Supijono E, Boshara P, Douglas SJ, Stronghill PE, Li B, Nambara E, Kliebenstein DJ, Riggs CD. flasher, a novel mutation in a glucosinolate modifying enzyme, conditions changes in plant architecture and hormone homeostasis. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 103:1989-2006. [PMID: 32529723 DOI: 10.1111/tpj.14878] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 05/29/2020] [Indexed: 06/11/2023]
Abstract
Meristem function is underpinned by numerous genes that affect hormone levels, ultimately controlling phyllotaxy, the transition to flowering and general growth properties. Class I KNOX genes are major contributors to this process, promoting cytokinin biosynthesis but repressing gibberellin production to condition a replication competent state. We identified a suppressor mutant of the KNOX1 mutant brevipedicellus (bp) that we termed flasher (fsh), which promotes stem and pedicel elongation, suppresses early senescence, and negatively affects reproductive development. Map-based cloning and complementation tests revealed that fsh is due to an E40K change in the flavin monooxygenase GS-OX5, a gene encoding a glucosinolate (GSL) modifying enzyme. In vitro enzymatic assays revealed that fsh poorly converts substrate to product, yet the levels of several GSLs are higher in the suppressor line, implicating FSH in feedback control of GSL flux. FSH is expressed predominantly in the vasculature in patterns that do not significantly overlap those of BP, implying a non-cell autonomous mode of meristem control via one or more GSL metabolites. Hormone analyses revealed that cytokinin levels are low in bp, but fsh restores cytokinin levels to near normal by activating cytokinin biosynthesis genes. In addition, jasmonate levels in the fsh suppressor are significantly lower than in bp, which is likely due to elevated expression of JA inactivating genes. These observations suggest the involvement of the GSL pathway in generating one or more negative effectors of growth that influence inflorescence architecture and fecundity by altering the balance of hormonal regulators.
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Affiliation(s)
- Ameth N Garrido
- Department of Biological Sciences, University of Toronto, Toronto, ON, Canada
| | - Esther Supijono
- Department of Biological Sciences, University of Toronto, Toronto, ON, Canada
| | - Peter Boshara
- Department of Biological Sciences, University of Toronto, Toronto, ON, Canada
| | - Scott J Douglas
- Department of Biological Sciences, University of Toronto, Toronto, ON, Canada
| | - Patti E Stronghill
- Department of Biological Sciences, University of Toronto, Toronto, ON, Canada
| | - Baohua Li
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Eiji Nambara
- Department of Cell and Systems Biology, University of Toronto, Toronto, ON, Canada
| | | | - C Daniel Riggs
- Department of Biological Sciences, University of Toronto, Toronto, ON, Canada
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, China
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23
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Zhong Y, Xie J, Wen S, Wu W, Tan L, Lei M, Shi H, Zhu JK. TPST is involved in fructose regulation of primary root growth in Arabidopsis thaliana. PLANT MOLECULAR BIOLOGY 2020; 103:511-525. [PMID: 32279151 DOI: 10.1007/s11103-020-01006-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Accepted: 04/08/2020] [Indexed: 06/11/2023]
Abstract
TPST is involved in fructose signaling to regulate the root development and expression of genes in biological processes including auxin biosynthesis and accumulation in Arabidopsis. Sulfonation of proteins by tyrosine protein sulfotransferases (TPST) has been implicated in many important biological processes in eukaryotic organisms. Arabidopsis possesses a single TPST gene and its role in auxin homeostasis and root development has been reported. Here we show that the Arabidopsis tpst mutants are hypersensitive to fructose. In contrast to sucrose and glucose, fructose represses primary root growth of various ecotypes of Arabidopsis at low concentrations. RNA-seq analysis identified 636 differentially expressed genes (DEGs) in Col-0 seedlings in response to fructose verses glucose. GO and KEGG analyses of the DEGs revealed that fructose down-regulates genes involved in photosynthesis, glucosinolate biosynthesis and IAA biosynthesis, but up-regulates genes involved in the degradation of branched amino acids, sucrose starvation response, and dark response. The fructose responsive DEGs in the tpst mutant largely overlapped with that in Col-0, and most DEGs in tpst displayed larger changes than in Col-0. Interestingly, the fructose up-regulated DEGs includes genes encoding two AtTPST substrate proteins, Phytosulfokine 2 (PSK2) and Root Meristem Growth Factor 7 (RGF7). Synthesized peptides of PSK-α and RGF7 could restore the fructose hypersensitivity of tpst mutant plants. Furthermore, auxin distribution and accumulation at the root tip were affected by fructose and the tpst mutation. Our findings suggest that fructose serves as a signal to regulate the expression of genes involved in various biological processes including auxin biosynthesis and accumulation, and that modulation of auxin accumulation and distribution in roots by fructose might be partly mediated by the TPST substrate genes PSK-α and RGF7.
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Affiliation(s)
- Yingli Zhong
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, 410128, China.
- Shanghai Center for Plant Stress Biology, and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 201602, China.
| | - Jiyong Xie
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, 410128, China
- Shanghai Center for Plant Stress Biology, and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
| | - Suzhen Wen
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, 410128, China
- Shanghai Center for Plant Stress Biology, and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
| | - Wenwu Wu
- Shanghai Center for Plant Stress Biology, and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
| | - Li Tan
- Shanghai Center for Plant Stress Biology, and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
| | - Mingguang Lei
- Shanghai Center for Plant Stress Biology, and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
| | - Huazhong Shi
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, 79409, USA
| | - Jian-Kang Zhu
- Shanghai Center for Plant Stress Biology, and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
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24
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Yang S, Bai J, Wang J. TDIF peptides regulate root growth by affecting auxin homeostasis and PINs expression in Arabidopsis thaliana. PLANTA 2020; 251:109. [PMID: 32472155 DOI: 10.1007/s00425-020-03406-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 05/21/2020] [Indexed: 06/11/2023]
Abstract
TDIF and TDIF-like peptides in excess simultaneously facilitate primary root elongation and lateral root formation through regulating auxin distribution and transport. Tracheary element differentiation inhibitory factor (TDIF) plays key roles in mediating cell-cell communication and stem cell maintenance during vascular development. Recently, TDIF has also been linked to lateral root (LR) organogenesis through Brassinosteroid Insensitive 2 (BIN2) action. In this work, by comparing the in vitro and in vivo activities of AtCLE41-encoded TDIF and one poplar-derived TDIF-like peptide in Arabidopsis thaliana, we demonstrated that both TDIFs promoted primary root (PR) growth and stimulated LR formation. Without affecting auxin biosynthesis and catabolism, TDIFs suppressed the auxin maxima at PR apex but intensified the auxin accumulation at LR initiation sites along the longitudinal axis of PR. TDIF did not alter root sensitivity to exogenous auxin and mutants with varied endogenous auxin levels responded to TDIF peptides in a wild-type manner but to a lesser extent. Intriguingly, TDIF specifically upregulated the transcript abundance of PINs and multiple pin mutants displayed insensitivity to TDIF, demonstrating that PIN-mediated polar auxin transport (PAT) is indispensably required for the TDIF-induced root phenotypes. Taken together, our results revealed that TDIF might target PAT via mobilizing auxin efflux carriers to dynamically regulate the auxin signaling output and hence facilitate PR growth and LR formation.
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Affiliation(s)
- Shaohui Yang
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - Jingping Bai
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - Jiehua Wang
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.
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25
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Abstract
Plants have a variety of strategies to avoid canopy shade and compete with their neighbors for light, collectively called the shade avoidance syndrome (SAS). Plants also have extensive systems to defend themselves against pathogens and herbivores. Defense and shade avoidance are two fundamental components of plant survival and productivity, and there are often tradeoffs between growth and defense. Recently, MYC2, a major positive regulator of defense, was reported to inhibit elongation during shade avoidance. Here, we further investigate the role of MYC2 and the related MYC3 and MYC4 in shade avoidance, and we examine the relationship between MYC2/3/4 and the PIF family of light-regulated transcription factors. We demonstrate that MYC2/3/4 inhibit both elongation and flowering. Furthermore, using both genetic and transcriptomic analysis we find that MYCs and PIFs generally function independently in growth regulation. However, surprisingly, the pif4/5/7 triple mutant restored the petiole shade avoidance response of myc2 (jin1-2) and myc2/3/4 We theorize that increased petiole elongation in myc2/3/4 could be more due to resource tradeoffs or post-translational modifications rather than interactions with PIF4/5/7 affecting gene regulation.
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26
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Gao Y, Dai X, Aoi Y, Takebayashi Y, Yang L, Guo X, Zeng Q, Yu H, Kasahara H, Zhao Y. Two homologous INDOLE-3-ACETAMIDE (IAM) HYDROLASE genes are required for the auxin effects of IAM in Arabidopsis. J Genet Genomics 2020; 47:157-165. [PMID: 32327358 DOI: 10.1016/j.jgg.2020.02.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Revised: 12/31/2019] [Accepted: 02/20/2020] [Indexed: 11/27/2022]
Abstract
Indole-3-acetamide (IAM) is the first confirmed auxin biosynthetic intermediate in some plant pathogenic bacteria. Exogenously applied IAM or production of IAM by overexpressing the bacterial iaaM gene in Arabidopsis causes auxin overproduction phenotypes. However, it is still inconclusive whether plants use IAM as a key precursor for auxin biosynthesis. Herein, we reported the isolation IAMHYDROLASE1 (IAMH1) gene in Arabidopsis from a forward genetic screen for IAM-insensitive mutants that display normal auxin sensitivities. IAMH1 has a close homolog named IAMH2 that is located right next to IAMH1 on chromosome IV in Arabidopsis. We generated iamh1 iamh2 double mutants using our CRISPR/Cas9 gene editing technology. We showed that disruption of the IAMH genes rendered Arabidopsis plants resistant to IAM treatments and also suppressed the iaaM overexpression phenotypes, suggesting that IAMH1 and IAMH2 are the main enzymes responsible for converting IAM into indole-3-acetic acid (IAA) in Arabidopsis. The iamh double mutants did not display obvious developmental defects, indicating that IAM does not play a major role in auxin biosynthesis under normal growth conditions. Our findings provide a solid foundation for clarifying the roles of IAM in auxin biosynthesis and plant development.
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Affiliation(s)
- Yangbin Gao
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, CA, 92093-0116, USA
| | - Xinhua Dai
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, CA, 92093-0116, USA
| | - Yuki Aoi
- Department of Bioregulation and Biointeraction, Graduate School of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, 183-8509, Japan
| | - Yumiko Takebayashi
- RIKEN Center for Sustainable Resource Science, Kanagawa, 230-0045, Japan
| | - Liping Yang
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, CA, 92093-0116, USA; School of Life Sciences, Jilin Normal University, Siping, 136000, China
| | - Xiaorui Guo
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, CA, 92093-0116, USA; Key Laboratory of Plant Ecology, Northeast Forestry University, Harbin, 150040, China
| | - Qiwei Zeng
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, CA, 92093-0116, USA; State Key Laboratory of Silkworm Genome Biology, Institute of Sericulture and Systems Biology, Southwest University, Chongqing, 400716, China
| | - Hanchuanzhi Yu
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, CA, 92093-0116, USA
| | - Hiroyuki Kasahara
- RIKEN Center for Sustainable Resource Science, Kanagawa, 230-0045, Japan; Institute of Global Innovation Research, Tokyo University of Agriculture and Technology, Tokyo, 183-8509, Japan
| | - Yunde Zhao
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, CA, 92093-0116, USA.
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27
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Zhang D, Song YH, Dai R, Lee TG, Kim J. Aldoxime Metabolism Is Linked to Phenylpropanoid Production in Camelina sativa. FRONTIERS IN PLANT SCIENCE 2020; 11:17. [PMID: 32117366 PMCID: PMC7025560 DOI: 10.3389/fpls.2020.00017] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 01/09/2020] [Indexed: 05/03/2023]
Abstract
Plants produce diverse secondary metabolites. Although each metabolite is made through its respective biosynthetic pathway, plants coordinate multiple biosynthetic pathways simultaneously. One example is an interaction between glucosinolate and phenylpropanoid pathways in Arabidopsis thaliana. Glucosinolates are defense compounds made primarily from methionine and tryptophan, while phenylpropanoids are made from phenylalanine. Recent studies have shown that the accumulation of glucosinolate intermediate such as indole-3-acetaldoxime (IAOx) or its derivatives represses phenylpropanoid production via the degradation of phenylalanine ammonia lyase (PAL) functioning at the entry point of the phenylpropanoid pathway. Given that IAOx is a precursor of other bioactive compounds other than glucosinolates and that the phenylpropanoid pathway is present in most plants, we hypothesized that this interaction is relevant to other species. Camelina sativa is an oil crop and produces camalexin from IAOx. We enhanced IAOx production in Camelina by overexpressing Arabidopsis CYP79B2 which encodes an IAOx-producing enzyme. The overexpression of AtCYP79B2 results in increased auxin content and its associated morphological phenotypes in Camelina but indole glucosinolates were not detected in Camelina wild type as well as the overexpression lines. However, phenylpropanoid contents were reduced in AtCYP79B2 overexpression lines suggesting a link between aldoxime metabolism and phenylpropanoid production. Interestingly, the expression of PALs was not affected in the overexpression lines although PAL activity was reduced. To test if PAL degradation is involved in the crosstalk, we identified F-box genes functioning in PAL degradation through a phylogenetic study. A total of 459 transcript models encoding kelch-motifs were identified from the Camelina sativa database. Among them, the expression of CsKFBs involved in PAL degradation is up-regulated in the transgenic lines. Our results suggest a link between aldoxime metabolism and phenylpropanoid production in Camelina and that the molecular mechanism behind the crosstalk is conserved in Arabidopsis and Camelina.
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Affiliation(s)
- Dingpeng Zhang
- Horticultural Sciences Department, University of Florida, Gainesville, FL, United States
| | - Yeong Hun Song
- Horticultural Sciences Department, University of Florida, Gainesville, FL, United States
| | - Ru Dai
- Horticultural Sciences Department, University of Florida, Gainesville, FL, United States
| | - Tong Geon Lee
- Horticultural Sciences Department, University of Florida, Gainesville, FL, United States
- Gulf Coast Research and Education Center, University of Florida, Wimauma, FL, United States
- Plant Molecular and Cellular Biology Graduate Program, University of Florida, Gainesville, FL, United States
| | - Jeongim Kim
- Horticultural Sciences Department, University of Florida, Gainesville, FL, United States
- Plant Molecular and Cellular Biology Graduate Program, University of Florida, Gainesville, FL, United States
- *Correspondence: Jeongim Kim,
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28
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Liao P, Lung SC, Chan WL, Bach TJ, Lo C, Chye ML. Overexpression of HMG-CoA synthase promotes Arabidopsis root growth and adversely affects glucosinolate biosynthesis. JOURNAL OF EXPERIMENTAL BOTANY 2020; 71:272-289. [PMID: 31557302 PMCID: PMC6913736 DOI: 10.1093/jxb/erz420] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 09/10/2019] [Indexed: 05/06/2023]
Abstract
3-Hydroxy-3-methylglutaryl-CoA synthase (HMGS) catalyses the second step of the mevalonate (MVA) pathway. An HMGS inhibitor (F-244) has been reported to retard growth in wheat, tobacco, and Brassica juncea, but the mechanism remains unknown. Although the effects of HMGS on downstream isoprenoid metabolites have been extensively reported, not much is known on how it might affect non-isoprenoid metabolic pathways. Here, the mechanism of F-244-mediated inhibition of primary root growth in Arabidopsis and the relationship between HMGS and non-isoprenoid metabolic pathways were investigated by untargeted SWATH-MS quantitative proteomics, quantitative real-time PCR, and target metabolite analysis. Our results revealed that the inhibition of primary root growth caused by F-244 was a consequence of reduced stigmasterol, auxin, and cytokinin levels. Interestingly, proteomic analyses identified a relationship between HMGS and glucosinolate biosynthesis. Inhibition of HMGS activated glucosinolate biosynthesis, resulting from the induction of glucosinolate biosynthesis-related genes, suppression of sterol biosynthesis-related genes, and reduction in sterol levels. In contrast, HMGS overexpression inhibited glucosinolate biosynthesis, due to down-regulation of glucosinolate biosynthesis-related genes, up-regulation of sterol biosynthesis-related genes, and increase in sterol content. Thus, HMGS might represent a target for the manipulation of glucosinolate biosynthesis, given the regulatory relationship between HMGS in the MVA pathway and glucosinolate biosynthesis.
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Affiliation(s)
- Pan Liao
- School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China
- State Key Laboratory of Agrobiotechnology, CUHK, Shatin, Hong Kong, China
| | - Shiu-Cheung Lung
- School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Wai Lung Chan
- School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Thomas J Bach
- Centre National de la Recherche Scientifique, UPR 2357, Institut de Biologie Moléculaire des Plantes, Université de Strasbourg, Strasbourg, France
| | - Clive Lo
- School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Mee-Len Chye
- School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China
- State Key Laboratory of Agrobiotechnology, CUHK, Shatin, Hong Kong, China
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29
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Lakehal A, Dob A, Novák O, Bellini C. A DAO1-Mediated Circuit Controls Auxin and Jasmonate Crosstalk Robustness during Adventitious Root Initiation in Arabidopsis. Int J Mol Sci 2019; 20:E4428. [PMID: 31505771 PMCID: PMC6769753 DOI: 10.3390/ijms20184428] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 08/31/2019] [Accepted: 09/06/2019] [Indexed: 11/16/2022] Open
Abstract
Adventitious rooting is a post-embryonic developmental program governed by a multitude of endogenous and environmental cues. Auxin, along with other phytohormones, integrates and translates these cues into precise molecular signatures to provide a coherent developmental output. Auxin signaling guides every step of adventitious root (AR) development from the early event of cell reprogramming and identity transitions until emergence. We have previously shown that auxin signaling controls the early events of AR initiation (ARI) by modulating the homeostasis of the negative regulator jasmonate (JA). Although considerable knowledge has been acquired about the role of auxin and JA in ARI, the genetic components acting downstream of JA signaling and the mechanistic basis controlling the interaction between these two hormones are not well understood. Here we provide evidence that COI1-dependent JA signaling controls the expression of DAO1 and its closely related paralog DAO2. In addition, we show that the dao1-1 loss of function mutant produces more ARs than the wild type, probably due to its deficiency in accumulating JA and its bioactive metabolite JA-Ile. Together, our data indicate that DAO1 controls a sensitive feedback circuit that stabilizes the auxin and JA crosstalk during ARI.
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Affiliation(s)
- Abdellah Lakehal
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90736 Umeå, Sweden
| | - Asma Dob
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90736 Umeå, Sweden
| | - Ondřej Novák
- Laboratory of Growth Regulators, Faculty of Science, Palacký University and Institute of Experimental Botany, The Czech Academy of Sciences, 78371 Olomouc, Czech Republic
- Umeå Plant Science Centre, Department of Forest Genetics and Physiology, Swedish Agriculture University, SE-90183 Umea, Sweden
| | - Catherine Bellini
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90736 Umeå, Sweden.
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, FR-78000 Versailles, France.
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30
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Casanova-Sáez R, Voß U. Auxin Metabolism Controls Developmental Decisions in Land Plants. TRENDS IN PLANT SCIENCE 2019; 24:741-754. [PMID: 31230894 DOI: 10.1016/j.tplants.2019.05.006] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 05/15/2019] [Accepted: 05/20/2019] [Indexed: 05/03/2023]
Abstract
Unlike animals, whose body plans are set during embryo development, plants maintain the ability to initiate new organs throughout their life cycle. Auxin is a key regulator of almost all aspects of plant development, including morphogenesis and adaptive responses. Cellular auxin concentrations influence whether a cell will divide, grow, or differentiate, thereby contributing to organ formation, growth, and ultimately plant shape. Auxin gradients are established and maintained by a tightly regulated interplay between metabolism, signalling, and transport. Auxin is synthesised, stored, and inactivated by a multitude of parallel pathways that are all tightly regulated. Here we summarise the remarkable progress that has been achieved in identifying some key components of these pathways and the genetic complexity underlying their precise regulation.
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Affiliation(s)
- Rubén Casanova-Sáez
- Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden.
| | - Ute Voß
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, UK.
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31
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Lehman TA, Sanguinet KA. Auxin and Cell Wall Crosstalk as Revealed by the Arabidopsis thaliana Cellulose Synthase Mutant Radially Swollen 1. PLANT & CELL PHYSIOLOGY 2019; 60:1487-1503. [PMID: 31004494 DOI: 10.1093/pcp/pcz055] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 03/29/2019] [Indexed: 06/09/2023]
Abstract
Plant cells sheath themselves in a complex lattice of polysaccharides, proteins and enzymes forming an integral matrix known as the cell wall. Cellulose microfibrils, the primary component of cell walls, are synthesized at the plasma membrane by CELLULOSE SYNTHASE A (CESA) proteins throughout cellular growth and are responsible for turgor-driven anisotropic expansion. Associations between hormone signaling and cell wall biosynthesis have long been suggested, but recently direct links have been found revealing hormones play key regulatory roles in cellulose biosynthesis. The radially swollen 1 (rsw1) allele of Arabidopsis thaliana CESA1 harbors a single amino acid change that renders the protein unstable at high temperatures. We used the conditional nature of rsw1 to investigate how auxin contributes to isotropic growth. We found that exogenous auxin treatment reduces isotropic swelling in rsw1 roots at the restrictive temperature of 30�C. We also discovered decreases in auxin influx between rsw1 and wild-type roots via confocal imaging of AUX1-YFP, even at the permissive temperature of 19�C. Moreover, rsw1 displayed mis-expression of auxin-responsive and CESA genes. Additionally, we found altered auxin maxima in rsw1 mutant roots at the onset of swelling using DII-VENUS and DR5:vYFP auxin reporters. Overall, we conclude disrupted cell wall biosynthesis perturbs auxin transport leading to altered auxin homeostasis impacting both anisotropic and isotropic growth that affects overall root morphology.
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Affiliation(s)
- Thiel A Lehman
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, USA
| | - Karen A Sanguinet
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, USA
- Molecular Plant Sciences Graduate Group, Washington State University, Pullman, WA, USA
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Ibáñez S, Ruiz-Cano H, Fernández MÁ, Sánchez-García AB, Villanova J, Micol JL, Pérez-Pérez JM. A Network-Guided Genetic Approach to Identify Novel Regulators of Adventitious Root Formation in Arabidopsis thaliana. FRONTIERS IN PLANT SCIENCE 2019; 10:461. [PMID: 31057574 PMCID: PMC6478000 DOI: 10.3389/fpls.2019.00461] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 03/27/2019] [Indexed: 05/05/2023]
Abstract
Adventitious roots (ARs) are formed de novo during post-embryonic development from non-root tissues, in processes that are highly dependent on environmental inputs. Whole root excision from young seedlings has been previously used as a model to study adventitious root formation in Arabidopsis thaliana hypocotyls. To identify novel regulators of adventitious root formation, we analyzed adventitious rooting in the hypocotyl after whole root excision in 112 T-DNA homozygous leaf mutants, which were selected based on the dynamic expression profiles of their annotated genes during hormone-induced and wound-induced tissue regeneration. Forty-seven T-DNA homozygous lines that displayed low rooting capacity as regards their wild-type background were dubbed as the less adventitious roots (lars) mutants. We identified eight lines with higher rooting capacity than their wild-type background that we named as the more adventitious roots (mars) mutants. A relatively large number of mutants in ribosomal protein-encoding genes displayed a significant reduction in adventitious root number in the hypocotyl after whole root excision. In addition, gene products related to gibberellin (GA) biosynthesis and signaling, auxin homeostasis, and xylem differentiation were confirmed to participate in adventitious root formation. Nearly all the studied mutants tested displayed similar rooting responses from excised whole leaves, which suggest that their affected genes participate in shared regulatory pathways required for de novo organ formation in different organs.
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Affiliation(s)
- Sergio Ibáñez
- Instituto de Bioingeniería, Universidad Miguel Hernández de Elche, Alicante, Spain
| | - Helena Ruiz-Cano
- Instituto de Bioingeniería, Universidad Miguel Hernández de Elche, Alicante, Spain
| | - María Á. Fernández
- Instituto de Bioingeniería, Universidad Miguel Hernández de Elche, Alicante, Spain
- Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Valencia, Spain
| | | | - Joan Villanova
- Instituto de Bioingeniería, Universidad Miguel Hernández de Elche, Alicante, Spain
- IDAI Nature S.L., La Pobla de Vallbona, Spain
| | - José Luis Micol
- Instituto de Bioingeniería, Universidad Miguel Hernández de Elche, Alicante, Spain
| | - José Manuel Pérez-Pérez
- Instituto de Bioingeniería, Universidad Miguel Hernández de Elche, Alicante, Spain
- *Correspondence: José Manuel Pérez-Pérez, ; arolab.edu.umh.es
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Lakehal A, Bellini C. Control of adventitious root formation: insights into synergistic and antagonistic hormonal interactions. PHYSIOLOGIA PLANTARUM 2019; 165:90-100. [PMID: 30159890 DOI: 10.1111/ppl.12823] [Citation(s) in RCA: 91] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 08/22/2018] [Accepted: 08/23/2018] [Indexed: 05/18/2023]
Abstract
Plants have evolved sophisticated root systems that help them to cope with harsh environmental conditions. They are typically composed of a primary root and lateral roots (LRs), but may also include adventitious roots (ARs). Unlike LRs, ARs may be initiated not only from pericycle cells, but from various cell types and tissues depending on the species. Phytohormones, together with many other internal and external stimuli, coordinate and guide every step of AR formation from the first event of cell reprogramming until emergence and outgrowth. In this review, we summarize recent advances in the molecular mechanisms controlling AR formation and highlight the main hormonal cross talk involved in its regulation under different conditions and in different model systems.
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Affiliation(s)
- Abdellah Lakehal
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90187 Umeå, Sweden
| | - Catherine Bellini
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90187 Umeå, Sweden
- Institut National de la Research Agronomic, UMR1318 INRA-AgroParisTech, Institut Jean-Pierre Bourgin, University of Paris-Sud, F-78000 Versailles, France
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Kim G, Jang S, Yoon EK, Lee SA, Dhar S, Kim J, Lee MM, Lim J. Involvement of Pyridoxine/Pyridoxamine 5'-Phosphate Oxidase (PDX3) in Ethylene-Induced Auxin Biosynthesis in the Arabidopsis Root. Mol Cells 2018; 41:1033-1044. [PMID: 30453730 PMCID: PMC6315319 DOI: 10.14348/molcells.2018.0363] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Accepted: 10/10/2018] [Indexed: 12/23/2022] Open
Abstract
As sessile organisms, plants have evolved to adjust their growth and development to environmental changes. It has been well documented that the crosstalk between different plant hormones plays important roles in the coordination of growth and development of the plant. Here, we describe a novel recessive mutant, mildly insensitive to ethylene (mine), which displayed insensitivity to the ethylene precursor, ACC (1-aminocyclopropane-1-carboxylic acid), in the root under the dark-grown conditions. By contrast, mine roots exhibited a normal growth response to exogenous IAA (indole-3-acetic acid). Thus, it appears that the growth responses of mine to ACC and IAA resemble those of weak ethylene insensitive (wei) mutants. To understand the molecular events underlying the crosstalk between ethylene and auxin in the root, we identified the MINE locus and found that the MINE gene encodes the pyridoxine 5'-phosphate (PNP)/pyridoxamine 5'-phosphate (PMP) oxidase, PDX3. Our results revealed that MINE/PDX3 likely plays a role in the conversion of the auxin precursor tryptophan to indole-3-pyruvic acid in the auxin biosynthesis pathway, in which TAA1 (TRYPTOPHAN AMINOTRANSFERASE OF ARABIDOPSIS 1) and its related genes (TRYPTOPHAN AMINOTRANSFERASE RELATED 1 and 2; TAR1 and TAR2) are involved. Considering that TAA1 and TARs belong to a subgroup of PLP (pyridoxal-5'-phosphate)-dependent enzymes, we propose that PLP produced by MINE/PDX3 acts as a cofactor in TAA1/TAR-dependent auxin biosynthesis induced by ethylene, which in turn influences the crosstalk between ethylene and auxin in the Arabidopsis root.
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Affiliation(s)
- Gyuree Kim
- Department of Systems Biotechnology, Konkuk University, Seoul,
Korea
| | - Sejeong Jang
- Department of Systems Biotechnology, Konkuk University, Seoul,
Korea
| | - Eun Kyung Yoon
- Department of Systems Biotechnology, Konkuk University, Seoul,
Korea
- Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore,
Singapore
| | - Shin Ae Lee
- Department of Systems Biotechnology, Konkuk University, Seoul,
Korea
- Department of Agricultural Biology, National Institute of Agricultural Sciences, Wanju,
Korea
| | - Souvik Dhar
- Department of Systems Biotechnology, Konkuk University, Seoul,
Korea
| | - Jinkwon Kim
- Department of Systems Biotechnology, Konkuk University, Seoul,
Korea
| | - Myeong Min Lee
- Department of Systems Biology, Yonsei University, Seoul,
Korea
| | - Jun Lim
- Department of Systems Biotechnology, Konkuk University, Seoul,
Korea
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Chao Y, Xie L, Yuan J, Guo T, Li Y, Liu F, Han L. Transcriptome analysis of leaf senescence in red clover ( Trifolium pratense L.). PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2018; 24:753-765. [PMID: 30150852 PMCID: PMC6103954 DOI: 10.1007/s12298-018-0562-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 03/24/2018] [Accepted: 05/22/2018] [Indexed: 05/28/2023]
Abstract
Red clover (Trifolium pratense L.) is an important cool-season legume plant, which is used as forage. Leaf senescence is a critical developmental process that negatively affects plant quality and yield. The regulatory mechanism of leaf senescence has been studied, and genes involved in leaf senescence have been cloned and characterized in many plants. However, those works mainly focused on model plants. Information about regulatory pathways and the genes involved in leaf senescence in red clover is very sparse. In this study, to better understand leaf senescence in red clover, transcriptome analysis of mature and senescent leaves was investigated using RNA-Seq. A total of about 35,067 genes were identified, and 481 genes were differentially expressed in mature and senescent leaves. Some identified differentially expressed genes showed similar expression patterns as those involved in leaf senescence in other species, such as Arabidopsis, Medicago truncatula and rice. Differentially expressed genes were confirmed by quantitative real-time PCR (qRT-PCR). Genes involved in signal transduction, transportation and metabolism of plant hormones, transcription factors and plant senescence were upregulated, while the downregulated genes were primarily involved in nutrient cycling, lipid/carbohydrate metabolism, hormone response and other processes. There were 64 differentially expressed transcription factor genes identified by RNA-Seq, including ERF, WRKY, bHLH, MYB and NAC. A total of 90 genes involved in biosynthesis, metabolism and transduction of plant hormones, including abscisic acid, jasmonic acid, cyokinin, brassinosteroid, salicylic acid and ethylene, were identified. Furthermore, 207 genes with direct roles in leaf senescence were demonstrated, such as senescence-associated genes. These genes were associated with senescence in other plants. Transcriptome analysis of mature and senescent leaves in red clover provides a large number of differentially expressed genes. Further analysis and identification of senescence-associated genes can provide new insight into the regulatory mechanisms of leaf development and senescence in legume plant and red clover.
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Affiliation(s)
- Yuehui Chao
- Turfgrass Research Institute, College of Forestry, Beijing Forestry University, Beijing, 100083 China
| | - Lijuan Xie
- School of Applied Chemistry and Biotechnology, Shenzhen Polytechnic, Shenzhen, 518055 China
| | - Jianbo Yuan
- Turfgrass Research Institute, College of Forestry, Beijing Forestry University, Beijing, 100083 China
| | - Tao Guo
- Turfgrass Research Institute, College of Forestry, Beijing Forestry University, Beijing, 100083 China
| | - Yinruizhi Li
- Turfgrass Research Institute, College of Forestry, Beijing Forestry University, Beijing, 100083 China
| | - Fengqi Liu
- Institute of Grassland Research, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086 China
| | - Liebao Han
- Turfgrass Research Institute, College of Forestry, Beijing Forestry University, Beijing, 100083 China
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Nguyen TN, Tuan PA, Mukherjee S, Son S, Ayele BT. Hormonal regulation in adventitious roots and during their emergence under waterlogged conditions in wheat. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:4065-4082. [PMID: 29788353 PMCID: PMC6054230 DOI: 10.1093/jxb/ery190] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2018] [Accepted: 05/14/2018] [Indexed: 05/21/2023]
Abstract
To gain insights into the molecular mechanisms underlying hormonal regulation in adventitious roots and during their emergence under waterlogged conditions in wheat, the present study investigated transcriptional regulation of genes related to hormone metabolism and transport in the root and stem node tissues. Waterlogging-induced inhibition of axile root elongation and lateral root formation, and promotion of surface adventitious and axile root emergence and aerenchyma formation are associated with enhanced expression levels of ethylene biosynthesis genes, ACS7 and ACO2, in both tissues. Inhibition of axile root elongation is also related to increased root indole acetic acid (IAA) and jasmonate (JA) levels that are associated with up-regulation of specific IAA biosynthesis/transport (TDC, YUC1, and PIN9) and JA metabolism (LOX8, AOS1, AOC1, and JAR1) genes, and transcriptional alteration of gibberellin (GA) metabolism genes (GA3ox2 and GA2ox8). Adventitious root emergence from waterlogged stem nodes is associated with increased levels of IAA and GA but decreased levels of cytokinin and abscisic acid (ABA), which are regulated through the expression of specific IAA biosynthesis/transport (TDC, YUC1, and PIN9), cytokinin metabolism (IPT5-2, LOG1, CKX5, and ZOG2), ABA biosynthesis (NCED1 and NCED2), and GA metabolism (GA3ox2 and GA2ox8) genes. These results enhance our understanding of the molecular mechanisms underlying the adaptive response of wheat to waterlogging.
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Affiliation(s)
- Tran-Nguyen Nguyen
- Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Pham Anh Tuan
- Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Shalini Mukherjee
- Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, Canada
| | - SeungHyun Son
- Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Belay T Ayele
- Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, Canada
- Correspondence:
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da Costa CT, Gaeta ML, de Araujo Mariath JE, Offringa R, Fett-Neto AG. Comparative adventitious root development in pre-etiolated and flooded Arabidopsis hypocotyls exposed to different auxins. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2018; 127:161-168. [PMID: 29604522 DOI: 10.1016/j.plaphy.2018.03.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 03/06/2018] [Accepted: 03/20/2018] [Indexed: 06/08/2023]
Abstract
Adventitious roots (ARs) emerge from stems, leaves or hypocotyls, being strategic for clonal propagation. ARs may develop spontaneously, upon environmental stress or hormonal treatment. Auxins strongly influence AR development (ARD), depending on concentration and kind. However, the role of different types of auxin is rarely compared at the molecular level. Rooting triggered by light exposure and flooding was examined in intact etiolated Arabidopsis thaliana hypocotyls treated with distinct auxin types. Morphological aspects, rooting-related gene expression profiles, and IAA immunolocalization were recorded. NAA and 2,4-D effects were highly dose-dependent; at higher concentrations NAA inhibited root growth and 2,4-D promoted callus formation. NAA yielded the highest number of roots, but inhibited elongation. IAA increased the number of roots with less interference in elongation, yielding the best overall rooting response. IAA was localized close to the tissues of root origin. Auxin stimulated ARD was marked by increased expression of PIN1 and GH3.3. NAA treatment induced expression of CYCB1, GH3.6 and ARF8. These NAA-specific responses may be associated with the development of numerous shorter roots. In contrast, expression of the auxin action inhibitor IAA28 was induced by IAA. Increased PIN1 expression indicated the relevance of auxin efflux transport for focusing in target cells, whereas GH3.3 suggested tight control of auxin homeostasis. IAA28 increased expression during IAA-induced ARD differs from what was previously reported for lateral root development, pointing to yet another possible difference in the molecular programs of these two developmental processes.
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Affiliation(s)
- Cibele Tesser da Costa
- Plant Physiology Laboratory, Center for Biotechnology, Federal University of Rio Grande do Sul (UFRGS), CP 15005, Porto Alegre, RS, 91501-970, Brazil
| | - Marcos Letaif Gaeta
- Plant Anatomy Laboratory, Department of Botany, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, Porto Alegre, RS, 91501-970, Brazil
| | - Jorge Ernesto de Araujo Mariath
- Plant Anatomy Laboratory, Department of Botany, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, Porto Alegre, RS, 91501-970, Brazil
| | - Remko Offringa
- Department of Molecular and Developmental Genetics, Institute Biology Leiden, Sylvius Laboratory, Sylviusweg 72, 2333 CB Leiden, The Netherlands
| | - Arthur Germano Fett-Neto
- Plant Physiology Laboratory, Center for Biotechnology, Federal University of Rio Grande do Sul (UFRGS), CP 15005, Porto Alegre, RS, 91501-970, Brazil.
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Cheng L, Jiang R, Yang J, Xu X, Zeng H, Li S. Transcriptome profiling reveals an IAA-regulated response to adventitious root formation in lotus seedling. Z NATURFORSCH C 2018; 73:229-240. [PMID: 29432208 DOI: 10.1515/znc-2017-0188] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 01/20/2018] [Indexed: 11/15/2022]
Abstract
Adventitious roots (ARs) of lotus (Nelumbonucifera Gaertn.) play a critical role in water and nutrient uptake. We found that exogenously applied 10-μM indole-3-acetic acid (IAA) promoted the formation of ARs, while 150-μM IAA significantly inhibited the emergence of ARs. However, little is known about these different responses to various concentrations of IAA at the molecular level. This study, therefore, examined the gene expression profiling in four libraries treated with 10- and 150-μM IAA based on the high-throughout tag sequencing technique. Approximately 2.4×107 clean tags were obtained after the removal of low-quality tags from each library respectively, among which about 10% clean tags were unambiguous tag-mapped genes to the reference genes. We found that some genes involved in auxin metabolism showed a similar tendency for expression in the A/CK and C/CK libraries, while three genes were enhanced their expression only in the A/CK libraries. Two transcription factors including B3 domain-containing protein At2g36080-like and trihelix transcription factor were up-regulated for transcriptional level in the A/C libraries. The expressions of six important genes related to AR formation were significantly different in the A/CK and C/CK libraries. In summary, this study provides a comprehensive understanding of gene expression regulated by IAA involved in AR formation in lotus.
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Affiliation(s)
- Libao Cheng
- School of Horticulture and Plant Protection, Yangzhou University, Jiangsu, P.R. China
| | - Runzhi Jiang
- School of Horticulture and Plant Protection, Yangzhou University, Jiangsu, P.R. China
| | - Jianjun Yang
- School of Horticulture and Plant Protection, Yangzhou University, Jiangsu, P.R. China
| | - Xiaoyong Xu
- School of Horticulture and Plant Protection, Yangzhou University, Jiangsu, P.R. China
| | - Haitao Zeng
- College of Life Sciences and Technology, Shaanxi University of Technology, Hanzhong, P.R. China
| | - Shuyan Li
- College of Guangling, Yangzhou University, Jiangsu, P.R. China
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Iglesias MJ, Sellaro R, Zurbriggen MD, Casal JJ. Multiple links between shade avoidance and auxin networks. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:213-228. [PMID: 29036463 DOI: 10.1093/jxb/erx295] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Auxin has emerged as a key player in the adjustment of plant morphology to the challenge imposed by variable environmental conditions. Shade-avoidance responses, including the promotion of stem and petiole growth, leaf hyponasty, and the inhibition of branching, involve an intimate connection between light and auxin signalling. Low activity of photo-sensory receptors caused by the presence of neighbouring vegetation enhances the activity of PHYTOCHROME INTERACTING FACTORs (PIFs), which directly promote the expression of genes involved in auxin biosynthesis, conjugation, transport, perception, and signalling. In seedlings, neighbour signals increase auxin levels in the foliage, which then moves to the stem, where it reaches epidermal tissues to promote growth. However, this model only partially accounts for shade-avoidance responses (which may also occur in the absence of increased auxin levels), and understanding the whole picture will require further insight into the functional significance of the multiple links between shade and auxin networks.
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Affiliation(s)
- María José Iglesias
- Instituto de Investigaciones Biológicas, CONICET-Universidad Nacional de Mar del Plata, Facultad de Ciencias Exactas y Naturales, Argentina
| | - Romina Sellaro
- IFEVA, Universidad de Buenos Aires and CONICET, Facultad de Agronomía, Argentina
| | - Matias D Zurbriggen
- Institute of Synthetic Biology and Cluster of Excellence on Plant Sciences (CEPLAS), University of Düsseldorf, Germany
| | - Jorge José Casal
- IFEVA, Universidad de Buenos Aires and CONICET, Facultad de Agronomía, Argentina
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires-CONICET, Argentina
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De Benedictis M, Brunetti C, Brauer EK, Andreucci A, Popescu SC, Commisso M, Guzzo F, Sofo A, Ruffini Castiglione M, Vatamaniuk OK, Sanità di Toppi L. The Arabidopsis thaliana Knockout Mutant for Phytochelatin Synthase1 ( cad1-3) Is Defective in Callose Deposition, Bacterial Pathogen Defense and Auxin Content, But Shows an Increased Stem Lignification. FRONTIERS IN PLANT SCIENCE 2018; 9:19. [PMID: 29403524 PMCID: PMC5786554 DOI: 10.3389/fpls.2018.00019] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 01/04/2018] [Indexed: 05/15/2023]
Abstract
The enzyme phytochelatin synthase (PCS) has long been studied with regard to its role in metal(loid) detoxification in several organisms, i.e., plants, yeasts, and nematodes. It is in fact widely recognized that PCS detoxifies a number of heavy metals by catalyzing the formation of thiol-rich oligomers, namely phytochelatins, from glutathione and related peptides. However, recent investigations have highlighted other possible roles played by the PCS enzyme in the plant cell, e.g., the control of pathogen-triggered callose deposition. In order to examine novel aspects of Arabidopsis thaliana PCS1 (AtPCS1) functions and to elucidate its possible roles in the secondary metabolism, metabolomic data of A. thaliana wild-type and cad1-3 mutant were compared, the latter lacking AtPCS1. HPLC-ESI-MS analysis showed differences in the relative levels of metabolites from the glucosinolate and phenylpropanoid pathways between cad1-3 and wild-type plants. Specifically, in control (Cd-untreated) plants, higher levels of 4-methoxy-indol-3-ylmethylglucosinolate were found in cad1-3 plants vs. wild-type. Moreover, the cad1-3 mutant showed to be impaired in the deposit of callose after Cd exposure, suggesting that AtPCS1 protects the plant against the toxicity of heavy metals not only by synthesizing PCs, but also by contributing to callose deposition. In line with the contribution of callose in counteracting Cd toxicity, we found that another callose-defective mutant, pen2-1, was more sensitive to high concentrations of Cd than wild-type plants. Moreover, cad1-3 plants were more susceptible than wild-type to the hemibiotrophic bacterial pathogen Pseudomonas syringae. The metabolome also revealed differences in the relative levels of hydroxycinnamic acids and flavonols, with consequences on cell wall properties and auxin content, respectively. First, increased lignification in the cad1-3 stems was found, probably aimed at counteracting the entry of Cd into the inner tissues. Second, in cad1-3 shoots, increased relative levels of kaempferol 3,7 dirhamnoside and quercetin hexoside rhamnoside were detected. These flavonols are endogenous inhibitors of auxin transport in planta; auxin levels in both roots and shoots of the cad1-3 mutant were in fact lower than those of the wild-type. Overall, our data highlight novel aspects of AtPCS1 functions in A. thaliana.
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Affiliation(s)
- Maria De Benedictis
- Department of Life Sciences, University of Parma, Parma, Italy
- Soil and Crop Sciences Section, School of Integrative Plant Sciences, Cornell University, Ithaca, NY, United States
| | - Cecilia Brunetti
- National Research Council of Italy, Istituto Per La Valorizzazione Del Legno E Delle Specie Arboree, Florence, Italy
| | | | | | - Sorina C. Popescu
- Department of Biochemistry, Molecular Biology, Entomology, and Plant Pathology, Mississippi State University, Starkville, MS, United States
| | - Mauro Commisso
- Department of Biotechnology, University of Verona, Verona, Italy
| | - Flavia Guzzo
- Department of Biotechnology, University of Verona, Verona, Italy
| | - Adriano Sofo
- School of Agricultural, Forestry, Food and Environmental Sciences, University of Basilicata, Potenza, Italy
| | | | - Olena K. Vatamaniuk
- Soil and Crop Sciences Section, School of Integrative Plant Sciences, Cornell University, Ithaca, NY, United States
| | - Luigi Sanità di Toppi
- Department of Biology, University of Pisa, Pisa, Italy
- *Correspondence: Luigi Sanità di Toppi,
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Malka SK, Cheng Y. Possible Interactions between the Biosynthetic Pathways of Indole Glucosinolate and Auxin. FRONTIERS IN PLANT SCIENCE 2017; 8:2131. [PMID: 29312389 PMCID: PMC5735125 DOI: 10.3389/fpls.2017.02131] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 11/30/2017] [Indexed: 05/21/2023]
Abstract
Glucosinolates (GLS) are a group of plant secondary metabolites mainly found in Cruciferous plants, share a core structure consisting of a β-thioglucose moiety and a sulfonated oxime, but differ by a variable side chain derived from one of the several amino acids. These compounds are hydrolyzed upon cell damage by thioglucosidase (myrosinase), and the resulting degradation products are toxic to many pathogens and herbivores. Human beings use these compounds as flavor compounds, anti-carcinogens, and bio-pesticides. GLS metabolism is complexly linked to auxin homeostasis. Indole GLS contributes to auxin biosynthesis via metabolic intermediates indole-3-acetaldoxime (IAOx) and indole-3-acetonitrile (IAN). IAOx is proposed to be a metabolic branch point for biosynthesis of indole GLS, IAA, and camalexin. Interruption of metabolic channeling of IAOx into indole GLS leads to high-auxin production in GLS mutants. IAN is also produced as a hydrolyzed product of indole GLS and metabolized to IAA by nitrilases. In this review, we will discuss current knowledge on involvement of GLS in auxin homeostasis.
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Affiliation(s)
- Siva K. Malka
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, China
| | - Youfa Cheng
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, China
- School of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
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42
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Olatunji D, Geelen D, Verstraeten I. Control of Endogenous Auxin Levels in Plant Root Development. Int J Mol Sci 2017; 18:E2587. [PMID: 29194427 PMCID: PMC5751190 DOI: 10.3390/ijms18122587] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 11/26/2017] [Accepted: 11/28/2017] [Indexed: 12/24/2022] Open
Abstract
In this review, we summarize the different biosynthesis-related pathways that contribute to the regulation of endogenous auxin in plants. We demonstrate that all known genes involved in auxin biosynthesis also have a role in root formation, from the initiation of a root meristem during embryogenesis to the generation of a functional root system with a primary root, secondary lateral root branches and adventitious roots. Furthermore, the versatile adaptation of root development in response to environmental challenges is mediated by both local and distant control of auxin biosynthesis. In conclusion, auxin homeostasis mediated by spatial and temporal regulation of auxin biosynthesis plays a central role in determining root architecture.
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Affiliation(s)
- Damilola Olatunji
- Department of Plant Production, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium.
| | - Danny Geelen
- Department of Plant Production, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium.
| | - Inge Verstraeten
- Department of Plant Production, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium.
- Institute of Science and Technology Austria, Am Campus 1, 3400 Klosterneuburg, Austria.
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Graña E, Costas-Gil A, Longueira S, Celeiro M, Teijeira M, Reigosa MJ, Sánchez-Moreiras AM. Auxin-like effects of the natural coumarin scopoletin on Arabidopsis cell structure and morphology. JOURNAL OF PLANT PHYSIOLOGY 2017; 218:45-55. [PMID: 28772153 DOI: 10.1016/j.jplph.2017.07.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 07/11/2017] [Accepted: 07/11/2017] [Indexed: 06/07/2023]
Abstract
The mode of action and phytotoxic potential of scopoletin, a natural compound belonging to the group of coumarins, has been evaluated in detail. Analysis conducted by light and electron transmission microscopy showed strong cell and tissue abnormalities on treated roots, such as cell wall malformations, multi-nucleated cells, abnormal nuclei and tissue disorganization. Scopoletin compromised root development by inducing wrong microtubule assembling, mitochondrial membrane depolarization and ultimate cell death, in a way similar to auxin herbicides. The structural similarities of the natural compound scopoletin and the auxin herbicide 2,4-D, as well as the ability of scopoletin to fit into the auxin-binding site TIR1, were analyzed, suggesting that the phytotoxic activity of scopoletin matches with that exhibited by auxinic herbicides.
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Affiliation(s)
- Elisa Graña
- Department of Plant Biology and Soil Science, Faculty of Biology, University of Vigo, Campus Lagoas-Marcosende s/n, 36310 Vigo, Spain.
| | - Aitana Costas-Gil
- Department of Plant Biology and Soil Science, Faculty of Biology, University of Vigo, Campus Lagoas-Marcosende s/n, 36310 Vigo, Spain.
| | - Sabela Longueira
- Department of Plant Biology and Soil Science, Faculty of Biology, University of Vigo, Campus Lagoas-Marcosende s/n, 36310 Vigo, Spain.
| | - María Celeiro
- Department of Organic Chemistry, Faculty of Chemistry, University of Vigo, Campus Lagoas-Marcosende s/n, 36310 Vigo, Spain.
| | - Marta Teijeira
- Department of Organic Chemistry, Faculty of Chemistry, University of Vigo, Campus Lagoas-Marcosende s/n, 36310 Vigo, Spain; Instituto de Investigación Sanitaria Galicia Sur (IISGS), Universidade de Vigo, 36310 Vigo, Spain.
| | - Manuel J Reigosa
- Department of Plant Biology and Soil Science, Faculty of Biology, University of Vigo, Campus Lagoas-Marcosende s/n, 36310 Vigo, Spain.
| | - Adela M Sánchez-Moreiras
- Department of Plant Biology and Soil Science, Faculty of Biology, University of Vigo, Campus Lagoas-Marcosende s/n, 36310 Vigo, Spain.
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Saini K, AbdElgawad H, Markakis MN, Schoenaers S, Asard H, Prinsen E, Beemster GTS, Vissenberg K. Perturbation of Auxin Homeostasis and Signaling by PINOID Overexpression Induces Stress Responses in Arabidopsis. FRONTIERS IN PLANT SCIENCE 2017; 8:1308. [PMID: 28824662 PMCID: PMC5539238 DOI: 10.3389/fpls.2017.01308] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 07/12/2017] [Indexed: 05/02/2023]
Abstract
Under normal and stress conditions plant growth require a complex interplay between phytohormones and reactive oxygen species (ROS). However, details of the nature of this crosstalk remain elusive. Here, we demonstrate that PINOID (PID), a serine threonine kinase of the AGC kinase family, perturbs auxin homeostasis, which in turn modulates rosette growth and induces stress responses in Arabidopsis plants. Arabidopsis mutants and transgenic plants with altered PID expression were used to study the effect on auxin levels and stress-related responses. In the leaves of plants with ectopic PID expression an accumulation of auxin, oxidative burst and disruption of hormonal balance was apparent. Furthermore, PID overexpression led to the accumulation of antioxidant metabolites, while pid knockout mutants showed only moderate changes in stress-related metabolites. These physiological changes in the plants overexpressing PID modulated their response toward external drought and osmotic stress treatments when compared to the wild type. Based on the morphological, transcriptome, and metabolite results, we propose that perturbations in the auxin hormone levels caused by PID overexpression, along with other hormones and ROS downstream, cause antioxidant accumulation and modify growth and stress responses in Arabidopsis. Our data provide further proof for a strong correlation between auxin and stress biology.
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Affiliation(s)
- Kumud Saini
- Integrated Molecular Plant Physiology Research, University of AntwerpAntwerp, Belgium
| | - Hamada AbdElgawad
- Integrated Molecular Plant Physiology Research, University of AntwerpAntwerp, Belgium
- Department of Botany, Faculty of Science, Beni-Suef UniversityBeni Suef, Egypt
| | - Marios N. Markakis
- Integrated Molecular Plant Physiology Research, University of AntwerpAntwerp, Belgium
- Faculty of Health and Medical Sciences, University of CopenhagenCopenhagen, Denmark
| | - Sébastjen Schoenaers
- Integrated Molecular Plant Physiology Research, University of AntwerpAntwerp, Belgium
| | - Han Asard
- Integrated Molecular Plant Physiology Research, University of AntwerpAntwerp, Belgium
| | - Els Prinsen
- Integrated Molecular Plant Physiology Research, University of AntwerpAntwerp, Belgium
| | - Gerrit T. S. Beemster
- Integrated Molecular Plant Physiology Research, University of AntwerpAntwerp, Belgium
| | - Kris Vissenberg
- Integrated Molecular Plant Physiology Research, University of AntwerpAntwerp, Belgium
- Plant and Biochemistry and Biotechnology Lab, Department of Agriculture, School of Agriculture, Food and Nutrition, Technological Educational Institute of Crete: University of Applied SciencesHeraklion, Greece
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45
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Mignolli F, Mariotti L, Picciarelli P, Vidoz ML. Differential auxin transport and accumulation in the stem base lead to profuse adventitious root primordia formation in the aerial roots (aer) mutant of tomato (Solanum lycopersicum L.). JOURNAL OF PLANT PHYSIOLOGY 2017; 213:55-65. [PMID: 28315795 DOI: 10.1016/j.jplph.2017.02.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 02/13/2017] [Accepted: 02/23/2017] [Indexed: 05/15/2023]
Abstract
The aerial roots (aer) mutant of tomato is characterized by a profuse and precocious formation of adventitious root primordia along the stem. We demonstrated that auxin is involved in the aer phenotype but ruled out higher auxin sensitivity of mutant plants. Interestingly, polar auxin transport was altered in aer, as young seedlings showed a reduced response to an auxin transport inhibitor and higher expression of auxin export carriers SlPIN1 and SlPIN3. An abrupt reduction in transcripts of auxin efflux and influx genes in older aer hypocotyls caused a marked deceleration of auxin transport in more mature tissues. Indeed, in 20days old aer plants, the transport of labeled IAA was faster in apices than in hypocotyls, displaying an opposite trend in comparison to a wild type. In addition, auxin transport facilitators (SlPIN1, SlPIN4, SlLAX5) were more expressed in aer apices than in hypocotyls, suggesting that auxin moves faster from the upper to the lower part of the stem. Consequently, a significantly higher level of free and conjugated IAA was found at the base of aer stems with respect to their apices. This auxin accumulation is likely the cause of the aer phenotype.
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Affiliation(s)
- F Mignolli
- Instituto de Botánica del Nordeste (IBONE), UNNE-CONICET, Sargento Cabral 2131, 3400 Corrientes, Argentina.
| | - L Mariotti
- Dipartimento di Scienze Agrarie, Alimentari e Agro-ambientali, Università di Pisa, Via del Borghetto 80, 56124 Pisa, Italy
| | - P Picciarelli
- Dipartimento di Scienze Agrarie, Alimentari e Agro-ambientali, Università di Pisa, Via del Borghetto 80, 56124 Pisa, Italy
| | - M L Vidoz
- Instituto de Botánica del Nordeste (IBONE), UNNE-CONICET, Sargento Cabral 2131, 3400 Corrientes, Argentina; Facultad de Ciencias Agrarias, UNNE, Sargento Cabral 2131, 3400 Corrientes, Argentina
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46
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Douglas SJ, Li B, Kliebenstein DJ, Nambara E, Riggs CD. A novel Filamentous Flower mutant suppresses brevipedicellus developmental defects and modulates glucosinolate and auxin levels. PLoS One 2017; 12:e0177045. [PMID: 28493925 PMCID: PMC5426679 DOI: 10.1371/journal.pone.0177045] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2016] [Accepted: 04/23/2017] [Indexed: 12/02/2022] Open
Abstract
BREVIPEDICELLUS (BP) encodes a class-I KNOTTED1-like homeobox (KNOX) transcription factor that plays a critical role in conditioning a replication competent state in the apical meristem, and it also governs growth and cellular differentiation in internodes and pedicels. To search for factors that modify BP signaling, we conducted a suppressor screen on bp er (erecta) plants and identified a mutant that ameliorates many of the pleiotropic defects of the parent line. Map based cloning and complementation studies revealed that the defect lies in the FILAMENTOUS FLOWER (FIL) gene, a member of the YABBY family of transcriptional regulators that contribute to meristem organization and function, phyllotaxy, leaf and floral organ growth and polarity, and are also known to repress KNOX gene expression. Genetic and cytological analyses of the fil-10 suppressor line indicate that the role of FIL in promoting growth is independent of its previously characterized influences on meristem identity and lateral organ polarity, and likely occurs non-cell-autonomously from superior floral organs. Transcription profiling of inflorescences revealed that FIL downregulates numerous transcription factors which in turn may subordinately regulate inflorescence architecture. In addition, FIL, directly or indirectly, activates over a dozen genes involved in glucosinolate production in part by activating MYB28, a known activator of many aliphatic glucosinolate biosynthesis genes. In the bp er fil-10 suppressor mutant background, enhanced expression of CYP71A13, AMIDASE1 (AMI) and NITRILASE genes suggest that auxin levels can be modulated by shunting glucosinolate metabolites into the IAA biosynthetic pathway, and increased IAA levels in the bp er fil-10 suppressor accompany enhanced internode and pedicel elongation. We propose that FIL acts to oppose KNOX1 gene function through a complex regulatory network that involves changes in secondary metabolites and auxin.
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Affiliation(s)
- Scott J. Douglas
- Department of Biological Sciences, University of Toronto-Scarborough, Scarborough, Ontario, Canada
| | - Baohua Li
- Department of Plant Sciences, University of California Davis, Davis, California, United States of America
| | - Daniel J. Kliebenstein
- Department of Plant Sciences, University of California Davis, Davis, California, United States of America
- DynaMo Center of Excellence, Copenhagen Plant Science Centre, University of Copenhagen, Denmark
| | - Eiji Nambara
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada
- Centre for the Analysis of Gene Evolution and Function, University of Toronto, Toronto, Ontario, Canada
| | - C. Daniel Riggs
- Department of Biological Sciences, University of Toronto-Scarborough, Scarborough, Ontario, Canada
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada
- Centre for the Analysis of Gene Evolution and Function, University of Toronto, Toronto, Ontario, Canada
- * E-mail:
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47
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Pacurar DI, Pacurar ML, Lakehal A, Pacurar AM, Ranjan A, Bellini C. The Arabidopsis Cop9 signalosome subunit 4 (CNS4) is involved in adventitious root formation. Sci Rep 2017; 7:628. [PMID: 28377589 PMCID: PMC5429640 DOI: 10.1038/s41598-017-00744-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Accepted: 03/14/2017] [Indexed: 11/09/2022] Open
Abstract
The COP9 signalosome (CSN) is an evolutionary conserved multiprotein complex that regulates many aspects of plant development by controlling the activity of CULLIN-RING E3 ubiquitin ligases (CRLs). CRLs ubiquitinate and target for proteasomal degradation a vast number of specific substrate proteins involved in many developmental and physiological processes, including light and hormone signaling and cell division. As a consequence of CSN pleiotropic function, complete loss of CSN activity results in seedling lethality. Therefore, a detailed analysis of CSN physiological functions in adult Arabidopsis plants has been hampered by the early seedling lethality of csn null mutants. Here we report the identification and characterization of a viable allele of the Arabidopsis COP9 signalosome subunit 4 (CSN4). The allele, designated csn4-2035, suppresses the adventitious root (AR) phenotype of the Arabidopsis superroot2-1 mutant, potentially by altering its auxin signaling. Furthermore, we show that although the csn4-2035 mutation affects primary and lateral root (LR) formation in the 2035 suppressor mutant, CSN4 and other subunits of the COP9 complex seem to differentially control AR and LR development.
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Affiliation(s)
- Daniel Ioan Pacurar
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90187, Umeå, Sweden. .,SweTree Technologies AB, P.O. Box 4095, SE-904 03, Umeå, Sweden.
| | - Monica Lacramioara Pacurar
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90187, Umeå, Sweden.,University of Agricultural Sciences and Veterinary Medicine, 400372, Cluj Napoca, Romania.,SweTree Technologies AB, P.O. Box 4095, SE-904 03, Umeå, Sweden
| | - Abdellah Lakehal
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90187, Umeå, Sweden
| | - Andrea Mariana Pacurar
- University of Agricultural Sciences and Veterinary Medicine, 400372, Cluj Napoca, Romania
| | - Alok Ranjan
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90187, Umeå, Sweden
| | - Catherine Bellini
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90187, Umeå, Sweden. .,Institut National de la Research Agronomic, UMR1318 INRA-AgroParisTech, Institut Jean-Pierre Bourgin, Univ. Paris-Sud, F-78000, Versailles, France.
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48
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Hu Y, Vandenbussche F, Van Der Straeten D. Regulation of seedling growth by ethylene and the ethylene-auxin crosstalk. PLANTA 2017; 245:467-489. [PMID: 28188422 DOI: 10.1007/s00425-017-2651-6] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 01/08/2017] [Indexed: 05/06/2023]
Abstract
This review highlights that the auxin gradient, established by local auxin biosynthesis and transport, can be controlled by ethylene, and steers seedling growth. A better understanding of the mechanisms in Arabidopsis will increase potential applications in crop species. In dark-grown Arabidopsis seedlings, exogenous ethylene treatment triggers an exaggeration of the apical hook, the inhibition of both hypocotyl and root elongation, and radial swelling of the hypocotyl. These features are predominantly based on the differential cell elongation in different cells/tissues mediated by an auxin gradient. Interestingly, the physiological responses regulated by ethylene and auxin crosstalk can be either additive or synergistic, as in primary root and root hair elongation, or antagonistic, as in hypocotyl elongation. This review focuses on the crosstalk of these two hormones at the seedling stage. Before illustrating the crosstalk, ethylene and auxin biosynthesis, metabolism, transport and signaling are briefly discussed.
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Affiliation(s)
- Yuming Hu
- Laboratory of Functional Plant Biology, Department of Biology, Ghent University, K.L. Ledeganckstraat 35, 9000, Ghent, Belgium
| | - Filip Vandenbussche
- Laboratory of Functional Plant Biology, Department of Biology, Ghent University, K.L. Ledeganckstraat 35, 9000, Ghent, Belgium
| | - Dominique Van Der Straeten
- Laboratory of Functional Plant Biology, Department of Biology, Ghent University, K.L. Ledeganckstraat 35, 9000, Ghent, Belgium.
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49
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Cao L, Yu Y, DuanMu H, Chen C, Duan X, Zhu P, Chen R, Li Q, Zhu Y, Ding X. A novel Glycine soja homeodomain-leucine zipper (HD-Zip) I gene, Gshdz4, positively regulates bicarbonate tolerance and responds to osmotic stress in Arabidopsis. BMC PLANT BIOLOGY 2016; 16:184. [PMID: 27553065 PMCID: PMC4995822 DOI: 10.1186/s12870-016-0872-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2016] [Accepted: 08/15/2016] [Indexed: 05/24/2023]
Abstract
BACKGROUND Wild soybean (Glycine soja) is a highly adaptive plant species which can grow well in saline-alkaline soils. In soybean genome, there exist about 140 HD-Zip (Homeodomain-leucine Zipper) genes. HD-Zip transcription factor family is one of the largest plant specific superfamilies and plays important roles in response to abiotic stresses. Although HD-Zip transcription factors have been broadly reported to be involved in plant resistance to abiotic stresses like salt and drought, their roles in response to bicarbonate stress is largely unknown. RESULTS From our previous transcriptome profile analysis of wild soybean treated by 50 mM NaHCO3, we identified an HD-Zip gene (Gshdz4) which showed high response to the alkaline stress. Our result of qRT-PCR showed that the expression of Gshdz4 was induced by alkaline stress (NaHCO3) in both leaves and roots of wild soybean. Overexpression of Gshdz4 in Arabidopsis resulted in enhanced tolerance to NaHCO3 and KHCO3 during the process of plant growth and development. However, the growths of transgenic and WT plants were not significantly different on the medium with high pH adjusted by KOH, implicating Gshdz4 is only responsible for resisting HCO3 (-) but not high pH. The transgenic plants had less MDA contents but higher POD activities and chlorophyll contents than the WT plants. Moreover, the transcript levels of stress-related genes, such as NADP-ME, H (+) -Ppase, RD29B and KIN1 were increased with greater extent in the transgenic plants than the wild plants. On the contrary, Gshdz4 overexpression lines were much sensitive to osmotic stress at seed germination and stocking stages compared to the wild plants. CONCLUSIONS We revealed that the important and special roles of Gshdz4 in enhancing bicarbonate tolerance and responding to osmotic stress. It is the first time to elucidate these novel functions of HD-ZIP transcription factors. All the evidences broaden our understanding of functions of HD-Zip family and provide clues for uncovering the mechanisms of high tolerance of wild soybean to saline-alkaline stresses.
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Affiliation(s)
- Lei Cao
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, 150030 China
| | - Yang Yu
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, 150030 China
| | - Huizi DuanMu
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, 150030 China
| | - Chao Chen
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, 150030 China
| | - Xiangbo Duan
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, 150030 China
| | - Pinghui Zhu
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, 150030 China
| | - Ranran Chen
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, 150030 China
| | - Qiang Li
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, 150030 China
| | - Yanming Zhu
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, 150030 China
| | - Xiaodong Ding
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, 150030 China
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50
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Overexpression of the bacterial tryptophan oxidase RebO affects auxin biosynthesis and Arabidopsis development. Sci Bull (Beijing) 2016. [DOI: 10.1007/s11434-016-1066-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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