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Lu X, Chen X, Liu J, Zheng M, Liang H. Integrating histology and phytohormone/metabolite profiling to understand rooting in yellow camellia cuttings. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2024; 346:112160. [PMID: 38908800 DOI: 10.1016/j.plantsci.2024.112160] [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: 02/21/2024] [Revised: 05/29/2024] [Accepted: 06/12/2024] [Indexed: 06/24/2024]
Abstract
Vegetative propagation through cutting is a widely used clonal approach for maintaining desired genotypes. However, some woody species have difficulty forming adventitious roots (ARs) with this approach, including yellow camellia (YC) C. nitidissima. Yellow camellias, prized for their ornamental value and potential health benefits in tea, remain difficult to propagate clonally due to this rooting recalcitrance. As part of the efforts to understand YC cuttings' recalcitrance, we conducted a detailed investigation into AR formation in yellow camellia cuttings via histology and endogenous phytohormone dynamics during this process. We also compared YC endogenous phytohormone and metabolite phytohormone profiles with those of easy-to-root poplar and willow cuttings. Our results indicate that the induction of ARs in YC cuttings is achievable through auxin treatment, and YC ARs are initiated from cambial derivatives and develop a vascular system connected with that of the stem. During AR induction, endogenous hormones showed a dynamic profile, with IAA continuing to increase starting 9 days after auxin induction. JA, JA-Ile, and OPDA showed a similar trend as IAA but decreased by the 45th day. Cytokinin first decreased to its lowest level by the 18th day and then increased. SA largely exhibited an increasing trend with a drop on the 36th day, while ABA first increased to its peak level by the 18th day and then decreased. Compared to poplar, YC cuttings had a low level of IAA, IAA-Asp, and OPDA, and a high level of cytokinin and SA. Metabolite profiling highlighted significant down-accumulation of compounds associated with AR formation in yellow camellias, such as citric and ascorbic acid, fructose, sucrose, flavonoids, and phenolic acid derivatives. Our study reveals the unfavorable endogenous hormone and metabolite profiles underlying the rooting recalcitrance of YC cuttings, providing valuable knowledge for addressing this challenge in clonal propagation.
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Affiliation(s)
- Xinya Lu
- Department of Biochemistry and Genetics, Clemson University, Clemson, SC 29634, United States
| | - Xiaotong Chen
- Department of Biochemistry and Genetics, Clemson University, Clemson, SC 29634, United States
| | - Jiayin Liu
- Department of Biochemistry and Genetics, Clemson University, Clemson, SC 29634, United States
| | - Mo Zheng
- D.W. Daniel High School, Central, SC 29630, United States
| | - Haiying Liang
- Department of Biochemistry and Genetics, Clemson University, Clemson, SC 29634, United States.
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Castro-Camba R, Neves M, Correia S, Canhoto J, Vielba JM, Sánchez C. Ethylene Action Inhibition Improves Adventitious Root Induction in Adult Chestnut Tissues. PLANTS (BASEL, SWITZERLAND) 2024; 13:738. [PMID: 38475584 DOI: 10.3390/plants13050738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 03/02/2024] [Accepted: 03/04/2024] [Indexed: 03/14/2024]
Abstract
Phase change refers to the process of maturation and transition from the juvenile to the adult stage. In response to this shift, certain species like chestnut lose the ability to form adventitious roots, thereby hindering the successful micropropagation of adult plants. While auxin is the main hormone involved in adventitious root formation, other hormones, such as ethylene, are also thought to play a role in its induction and development. In this study, experiments were carried out to determine the effects of ethylene on the induction and growth of adventitious roots. The analysis was performed in two types of chestnut microshoots derived from the same tree, a juvenile-like line with a high rooting ability derived from basal shoots (P2BS) and a line derived from crown branches (P2CR) with low rooting responses. By means of the application of compounds to modify ethylene content or inhibit its signalling, the potential involvement of this hormone in the induction of adventitious roots was analysed. Our results show that ethylene can modify the rooting competence of mature shoots, while the response in juvenile material was barely affected. To further characterise the molecular reasons underlying this maturation-derived shift in behaviour, specific gene expression analyses were developed. The findings suggest that several mechanisms, including ethylene signalling, auxin transport and epigenetic modifications, relate to the modulation of the rooting ability of mature chestnut microshoots and their recalcitrant behaviour.
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Affiliation(s)
- Ricardo Castro-Camba
- Department of Plant Production, Misión Biológica de Galicia, CSIC, Avda de Vigo s/n, 15705 Santiago de Compostela, Spain
| | - Mariana Neves
- Centre for Functional Ecology, TERRA Associate Laboratory, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456 Coimbra, Portugal
| | - Sandra Correia
- Centre for Functional Ecology, TERRA Associate Laboratory, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456 Coimbra, Portugal
- InnovPlantProtect CoLab, Estrada de Gil Vaz, 7350-478 Elvas, Portugal
| | - Jorge Canhoto
- Centre for Functional Ecology, TERRA Associate Laboratory, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456 Coimbra, Portugal
| | - Jesús M Vielba
- Department of Plant Production, Misión Biológica de Galicia, CSIC, Avda de Vigo s/n, 15705 Santiago de Compostela, Spain
| | - Conchi Sánchez
- Department of Plant Production, Misión Biológica de Galicia, CSIC, Avda de Vigo s/n, 15705 Santiago de Compostela, Spain
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Ran N, Liu S, Qi H, Wang J, Shen T, Xu W, Xu M. Long Non-Coding RNA lncWOX11a Suppresses Adventitious Root Formation of Poplar by Regulating the Expression of PeWOX11a. Int J Mol Sci 2023; 24:5766. [PMID: 36982841 PMCID: PMC10057709 DOI: 10.3390/ijms24065766] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 02/18/2023] [Accepted: 03/15/2023] [Indexed: 03/22/2023] Open
Abstract
Long non-coding RNAs (lncRNAs), a class of poorly conserved transcripts without protein-encoding ability, are widely involved in plant organogenesis and stress responses by mediating the transmission and expression of genetic information at the transcriptional, posttranscriptional, and epigenetic levels. Here, we cloned and characterized a novel lncRNA molecule through sequence alignment, Sanger sequencing, transient expression in protoplasts, and genetic transformation in poplar. lncWOX11a is a 215 bp transcript located on poplar chromosome 13, ~50 kbp upstream of PeWOX11a on the reverse strand, and the lncRNA may fold into a series of complex stem-loop structures. Despite the small open reading frame (sORF) of 51 bp within lncWOX11a, bioinformatics analysis and protoplast transfection revealed that lncWOX11a has no protein-coding ability. The overexpression of lncWOX11a led to a decrease in the quantity of adventitious roots on the cuttings of transgenic poplars. Further, cis-regulatory module prediction and CRISPR/Cas9 knockout experiments with poplar protoplasts demonstrated that lncWOX11a acts as a negative regulator of adventitious rooting by downregulating the WUSCHEL-related homeobox gene WOX11, which is supposed to activate adventitious root development in plants. Collectively, our findings imply that lncWOX11a is essential for modulating the formation and development of adventitious roots.
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Affiliation(s)
- Na Ran
- State Key Laboratory of Tree Genetics and Breeding, Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, 159 Longpan Road, Nanjing 210037, China; (N.R.); (H.Q.); (J.W.); (T.S.); (W.X.)
| | - Sian Liu
- College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225000, China;
| | - Haoran Qi
- State Key Laboratory of Tree Genetics and Breeding, Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, 159 Longpan Road, Nanjing 210037, China; (N.R.); (H.Q.); (J.W.); (T.S.); (W.X.)
| | - Jiali Wang
- State Key Laboratory of Tree Genetics and Breeding, Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, 159 Longpan Road, Nanjing 210037, China; (N.R.); (H.Q.); (J.W.); (T.S.); (W.X.)
| | - Tengfei Shen
- State Key Laboratory of Tree Genetics and Breeding, Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, 159 Longpan Road, Nanjing 210037, China; (N.R.); (H.Q.); (J.W.); (T.S.); (W.X.)
| | - Wenlin Xu
- State Key Laboratory of Tree Genetics and Breeding, Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, 159 Longpan Road, Nanjing 210037, China; (N.R.); (H.Q.); (J.W.); (T.S.); (W.X.)
| | - Meng Xu
- State Key Laboratory of Tree Genetics and Breeding, Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, 159 Longpan Road, Nanjing 210037, China; (N.R.); (H.Q.); (J.W.); (T.S.); (W.X.)
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Fan X, Li Y, Deng CH, Wang S, Wang Z, Wang Y, Qiu C, Xu X, Han Z, Li W. Strigolactone regulates adventitious root formation via the MdSMXL7-MdWRKY6-MdBRC1 signaling cascade in apple. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2023; 113:772-786. [PMID: 36575587 DOI: 10.1111/tpj.16082] [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: 09/14/2022] [Revised: 12/05/2022] [Accepted: 12/16/2022] [Indexed: 06/17/2023]
Abstract
Propagation through stem cuttings is a popular method worldwide for species such as fruit tree rootstocks and forest trees. Adventitious root (AR) formation from stem cuttings is crucial for effective and successful clonal propagation of apple rootstocks. Strigolactones (SLs) are newly identified hormones involved in AR formation. However, the regulatory mechanisms underpinning this process remain elusive. In the present study, weighted gene co-expression network analysis, as well as rooting assays using stable transgenic apple materials, revealed that MdBRC1 served as a key gene in the inhibition of AR formation by SLs. We have demonstrated that MdSMXL7 and MdWRKY6 synergistically regulated MdBRC1 expression, depending on the interactions of MdSMXL7 and MdWRKY6 at the protein level downstream of SLs as well as the direct promoter binding on MdBRC1 by MdWRKY6. Furthermore, biochemical studies and genetic analysis revealed that MdBRC1 inhibited AR formation by triggering the expression of MdGH3.1 in a transcriptional activation pathway. Finally, the present study not only proposes a component, MdWRKY6, that enables MdSMXL7 to regulate MdBRC1 during the process of SL-controlled AR formation in apple, but also provides prospective target genes to enhance AR formation capacity using CRISPR (i.e. clustered regularly interspaced short palindromic repeats) technology, particularly in woody plants.
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Affiliation(s)
- Xingqiang Fan
- College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Yuqi Li
- College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Cecilia H Deng
- The New Zealand Institute for Plant and Food Research Limited, 120 Mt Albert Road, Mt Albert, Auckland, 1025, New Zealand
| | - Shiyao Wang
- College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Zijun Wang
- College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Yi Wang
- College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Changpeng Qiu
- College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Xuefeng Xu
- College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Zhenhai Han
- College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Wei Li
- College of Horticulture, China Agricultural University, Beijing, 100193, China
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Ayala PG, Acevedo RM, Luna CV, Rivarola M, Acuña C, Marcucci Poltri S, González AM, Sansberro PA. Transcriptome Dynamics of Rooting Zone and Leaves during In Vitro Adventitious Root Formation in Eucalyptus nitens. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11233301. [PMID: 36501341 PMCID: PMC9740172 DOI: 10.3390/plants11233301] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 11/23/2022] [Accepted: 11/25/2022] [Indexed: 05/13/2023]
Abstract
Wood properties and agronomic traits associated with fast growth and frost tolerance make Eucalyptus nitens a valuable forest alternative. However, the rapid age-related decline in the adventitious root (AR) formation (herein, meaning induction, initiation, and expression stages) limits its propagation. We analyzed transcriptomic profile variation in leaves and stem bases during AR induction of microcuttings to elucidate the molecular mechanisms involved in AR formation. In addition, we quantified expressions of candidate genes associated with recalcitrance. We delimited the ontogenic phases of root formation using histological techniques and Scarecrow and Short-Root expression quantification for RNA sequencing sample collection. We quantified the gene expressions associated with root meristem formation, auxin biosynthesis, perception, signaling, conjugation, and cytokinin signaling in shoots harvested from 2- to 36-month-old plants. After IBA treatment, 702 transcripts changed their expressions. Several were involved in hormone homeostasis and the signaling pathways that determine cell dedifferentiation, leading to root meristem formation. In part, the age-related decline in the rooting capacity is attributable to the increase in the ARR1 gene expression, which negatively affects auxin homeostasis. The analysis of the transcriptomic variation in the leaves and rooting zones provided profuse information: (1) To elucidate the auxin metabolism; (2) to understand the hormonal and signaling processes involved; (3) to collect data associated with their recalcitrance.
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Affiliation(s)
- Paula G. Ayala
- Laboratorio de Biotecnología Aplicada y Genómica Funcional, Instituto de Botánica del Nordeste (IBONE-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional del Nordeste, Sgto. Cabral 2131, Corrientes W3402BKG, Argentina
- Mejoramiento Genético Forestal, INTA-EEA Concordia, CC 34, Concordia E3200AQK, Argentina
| | - Raúl M. Acevedo
- Laboratorio de Biotecnología Aplicada y Genómica Funcional, Instituto de Botánica del Nordeste (IBONE-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional del Nordeste, Sgto. Cabral 2131, Corrientes W3402BKG, Argentina
| | - Claudia V. Luna
- Laboratorio de Biotecnología Aplicada y Genómica Funcional, Instituto de Botánica del Nordeste (IBONE-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional del Nordeste, Sgto. Cabral 2131, Corrientes W3402BKG, Argentina
| | - Máximo Rivarola
- Instituto de Biotecnología, CICVyA (INTA), Nicolas Repetto y de los Reseros s/n, Hurlingham, Buenos Aires B1686IGC, Argentina
| | - Cintia Acuña
- Instituto de Biotecnología, CICVyA (INTA), Nicolas Repetto y de los Reseros s/n, Hurlingham, Buenos Aires B1686IGC, Argentina
| | - Susana Marcucci Poltri
- Instituto de Biotecnología, CICVyA (INTA), Nicolas Repetto y de los Reseros s/n, Hurlingham, Buenos Aires B1686IGC, Argentina
| | - Ana M. González
- Laboratorio de Biotecnología Aplicada y Genómica Funcional, Instituto de Botánica del Nordeste (IBONE-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional del Nordeste, Sgto. Cabral 2131, Corrientes W3402BKG, Argentina
| | - Pedro A. Sansberro
- Laboratorio de Biotecnología Aplicada y Genómica Funcional, Instituto de Botánica del Nordeste (IBONE-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional del Nordeste, Sgto. Cabral 2131, Corrientes W3402BKG, Argentina
- Correspondence: or ; Tel.: +54-3794427589
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Wang Y, Zhao H, Hu X, Zhang Y, Zhang Z, Zhang L, Li L, Hou L, Li M. Transcriptome and hormone Analyses reveal that melatonin promotes adventitious rooting in shaded cucumber hypocotyls. FRONTIERS IN PLANT SCIENCE 2022; 13:1059482. [PMID: 36518515 PMCID: PMC9742233 DOI: 10.3389/fpls.2022.1059482] [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: 10/01/2022] [Accepted: 11/11/2022] [Indexed: 06/17/2023]
Abstract
Melatonin, a multi-regulatory molecule, stimulates root generation and regulates many aspects of plant growth and developmental processes. To gain insight into the effects of melatonin on adventitious root (AR) formation, we use cucumber seedings subjected to one of three treatments: EW (hypocotyl exposed and irrigated with water), SW (hypocotyl shaded and irrigated with water) and SM (hypocotyl shaded and irrigated with 100 µM melatonin). Under shaded conditions, melatonin induced significant AR formation in the hypocotyl. To explore the mechanism of this melatonin-induced AR formation, we used transcriptome analysis to identify 1296 significant differentially expressed genes (DEGs). Comparing SM with SW, a total of 774 genes were upregulated and 522 genes were downregulated. The DEGs were classified among different metabolic pathways, especially those connected with the synthesis of secondary metabolites, with hormone signal transduction and with plant-pathogen interactions. Analyses indicate exogenous melatonin increased contents of endogenous auxin, jasmonic acid, salicylic acid, cytokinin and abscisic acid levels during AR formation. This study indicates melatonin promotes AR formation in cucumber seedings by regulating the expressions of genes related to hormone synthesis, signaling and cell wall formation, as well as by increasing the contents of auxin, cytokinin, jasmonic acid, salicylic acid and abscisic acid. This research elucidates the molecular mechanisms of melatonin's role in promoting AR formation in the hypocotyl of cucumber seedings under shaded conditions.
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Affiliation(s)
- Yuping Wang
- College of Horticulture, Shanxi Agricultural University, Taigu, Shanxi, China
- Experimental Teaching Center, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Hailiang Zhao
- College of Horticulture, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Xiaohui Hu
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Yi Zhang
- College of Horticulture, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Zicun Zhang
- College of Horticulture, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Lu Zhang
- College of Horticulture, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Lixia Li
- College of Horticulture, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Leiping Hou
- College of Horticulture, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Meilan Li
- College of Horticulture, Shanxi Agricultural University, Taigu, Shanxi, China
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Yan T, Mei C, Song H, Shan D, Sun Y, Hu Z, Wang L, Zhang T, Wang J, Kong J. Potential roles of melatonin and ABA on apple dwarfing in semi-arid area of Xinjiang China. PeerJ 2022; 10:e13008. [PMID: 35382008 PMCID: PMC8977067 DOI: 10.7717/peerj.13008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 02/04/2022] [Indexed: 01/11/2023] Open
Abstract
Dwarfing is a typic breeding trait for mechanical strengthening and relatively high yield in modern apple orchards. Clarification of the mechanisms associated with dwarfing is important for use of molecular technology to breed apple. Herein, we identified four dwarfing apple germplasms in semi-arid area of Xinjiang, China. The internodal distance of these four germplasms were significantly shorter than non-dwarfing control. Their high melatonin (MT) contents are negatively associated with their malondialdehyde (MDA) levels and oxidative damage. In addition, among the detected hormones including auxin (IAA), gibberellin (GA), brassinolide (BR), zeatin-riboside (ZR), and abscisic acid (ABA), only ABA and ZR levels were in good correlation with the dwarfing phenotype. The qPCR results showed that the expression of melatonin synthetic enzyme genes MdASMT1 and MdSNAT5, ABA synthetic enzyme gene MdAAO3 and degradative gene MdCYP707A, ZR synthetic enzyme gene MdIPT5 all correlated well with the enhanced levels of MT, ABA and the reduced level of of ZR in the dwarfing germplasms. Furthermore, the significantly higher expression of ABA marker genes (MdRD22 and MdRD29) and the lower expression of ZR marker genes (MdRR1 and MdRR2) in all the four dwarf germplasms were consistent with the ABA and ZR levels. Considering the yearly long-term drought occurring in Xinjiang, China, it seems that dwarfing with high contents of MT and ABA may be a good strategy for these germplasms to survive against drought stress. This trait of dwarfing may also benefit apple production and breeding in this semi-arid area.
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Affiliation(s)
- Tianci Yan
- College of Horticulture, China Agricultural University, Beijing, China,Sanya Institute of China Agricultural University, Sanya, Hainan, China
| | - Chuang Mei
- Scientific Observing and Experimental Station of Pomology (Xinjiang), Ministry of Agriculture, Urumqi, Xinjiang Uygur Autonomous Region, China,Institute of Horticultural Crops, Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang Uygur Autonomous Region, China
| | - Handong Song
- College of Horticulture, China Agricultural University, Beijing, China
| | - Dongqian Shan
- College of Horticulture, China Agricultural University, Beijing, China
| | - Yanzhao Sun
- College of Horticulture, China Agricultural University, Beijing, China
| | - Zehui Hu
- College of Horticulture, China Agricultural University, Beijing, China
| | - Lin Wang
- College of Horticulture, China Agricultural University, Beijing, China
| | - Tong Zhang
- College of Horticulture, China Agricultural University, Beijing, China
| | - Jixun Wang
- Scientific Observing and Experimental Station of Pomology (Xinjiang), Ministry of Agriculture, Urumqi, Xinjiang Uygur Autonomous Region, China,Institute of Horticultural Crops, Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang Uygur Autonomous Region, China
| | - Jin Kong
- College of Horticulture, China Agricultural University, Beijing, China,Sanya Institute of China Agricultural University, Sanya, Hainan, China
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Abstract
Adventitious root (AR) formation is required for the vegetative propagation of economically important horticultural crops, such as apples. Asexual propagation is commonly utilized for breeding programs because of its short life cycle, true-to-typeness, and high efficiency. The lack of AR formation from stem segments is a barrier to segment survival. Therefore, understanding the AR regulatory mechanisms is vital for the prolonged and effective use of biological resources. Several studies have been undertaken to comprehend the molecular and physiological control of AR, which has greatly extended our knowledge regarding AR formation in apples and other crops. Auxin, a master controller of AR formation, is widely used for inducing AR formation in stem cutting. At the same time, cytokinins (CKs) are important for cell division and molecular reprograming, and other hormones, sugars, and nutrients interact with auxin to control excision-induced AR formation. In this review, we discuss the present understandings of ARs’ formation from physiological and molecular aspects and highlight the immediate advancements made in identifying underlying mechanisms involved in the regulation of ARs. Despite the progress made in the previous decades, many concerns about excision-induced AR formation remain unanswered. These focus on the specific functions and interactions of numerous hormonal, molecular, and metabolic components and the overall framework of the entire shoot cutting in a demanding environment.
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Bagautdinova ZZ, Omelyanchuk N, Tyapkin AV, Kovrizhnykh VV, Lavrekha VV, Zemlyanskaya EV. Salicylic Acid in Root Growth and Development. Int J Mol Sci 2022; 23:ijms23042228. [PMID: 35216343 PMCID: PMC8875895 DOI: 10.3390/ijms23042228] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 02/10/2022] [Accepted: 02/14/2022] [Indexed: 11/18/2022] Open
Abstract
In plants, salicylic acid (SA) is a hormone that mediates a plant’s defense against pathogens. SA also takes an active role in a plant’s response to various abiotic stresses, including chilling, drought, salinity, and heavy metals. In addition, in recent years, numerous studies have confirmed the important role of SA in plant morphogenesis. In this review, we summarize data on changes in root morphology following SA treatments under both normal and stress conditions. Finally, we provide evidence for the role of SA in maintaining the balance between stress responses and morphogenesis in plant development, and also for the presence of SA crosstalk with other plant hormones during this process.
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Affiliation(s)
- Zulfira Z. Bagautdinova
- Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (Z.Z.B.); (N.O.); (A.V.T.); (V.V.K.); (V.V.L.)
| | - Nadya Omelyanchuk
- Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (Z.Z.B.); (N.O.); (A.V.T.); (V.V.K.); (V.V.L.)
| | - Aleksandr V. Tyapkin
- Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (Z.Z.B.); (N.O.); (A.V.T.); (V.V.K.); (V.V.L.)
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Vasilina V. Kovrizhnykh
- Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (Z.Z.B.); (N.O.); (A.V.T.); (V.V.K.); (V.V.L.)
| | - Viktoriya V. Lavrekha
- Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (Z.Z.B.); (N.O.); (A.V.T.); (V.V.K.); (V.V.L.)
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Elena V. Zemlyanskaya
- Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia; (Z.Z.B.); (N.O.); (A.V.T.); (V.V.K.); (V.V.L.)
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
- Correspondence:
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Li S, Tahir MM, Wu T, Xie L, Zhang X, Mao J, Ayyoub A, Xing L, Zhang D, Shao Y. Transcriptome Analysis Reveals Multiple Genes and Complex Hormonal-Mediated Interactions with PEG during Adventitious Root Formation in Apple. Int J Mol Sci 2022; 23:ijms23020976. [PMID: 35055162 PMCID: PMC8779459 DOI: 10.3390/ijms23020976] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Revised: 01/11/2022] [Accepted: 01/13/2022] [Indexed: 01/27/2023] Open
Abstract
Adventitious root (AR) formation is a bottleneck for the mass propagation of apple rootstocks, and water stress severely restricts it. Different hormones and sugar signaling pathways in apple clones determine AR formation under water stress, but these are not entirely understood. To identify them, GL-3 stem cuttings were cultured on polyethylene glycol (PEG) treatment. The AR formation was dramatically decreased compared with the PEG-free control (CK) cuttings by increasing the endogenous contents of abscisic acid (ABA), zeatin riboside (ZR), and methyl jasmonate (JA-me) and reducing the indole-3-acetic acid (IAA) and gibberellic acid 3 (GA3) contents. We performed a transcriptomic analysis to identify the responses behind the phenotype. A total of 3204 differentially expressed genes (DEGs) were identified between CK and PEG, with 1702 upregulated and 1502 downregulated genes. Investigation revealed that approximately 312 DEGs were strongly enriched in hormone signaling, sugar metabolism, root development, and cell cycle-related pathways. Thus, they were selected for their possible involvement in adventitious rooting. However, the higher accumulation of ABA, ZR, and JA-me contents and the upregulation of their related genes, as well as the downregulation of sugar metabolism-related genes, lead to the inhibition of ARs. These results indicate that AR formation is a complicated biological process chiefly influenced by multiple hormonal signaling pathways and sugar metabolism. This is the first study to demonstrate how PEG inhibits AR formation in apple plants.
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Affiliation(s)
- Shaohuan Li
- Yangling Sub-Center of National Center for Apple Improvement, College of Horticulture, Northwest Agriculture & Forestry University, Yangling, Xianyang 712100, China; (S.L.); (M.M.T.); (T.W.); (L.X.); (J.M.); (L.X.)
| | - Muhammad Mobeen Tahir
- Yangling Sub-Center of National Center for Apple Improvement, College of Horticulture, Northwest Agriculture & Forestry University, Yangling, Xianyang 712100, China; (S.L.); (M.M.T.); (T.W.); (L.X.); (J.M.); (L.X.)
| | - Tong Wu
- Yangling Sub-Center of National Center for Apple Improvement, College of Horticulture, Northwest Agriculture & Forestry University, Yangling, Xianyang 712100, China; (S.L.); (M.M.T.); (T.W.); (L.X.); (J.M.); (L.X.)
| | - Lingling Xie
- Yangling Sub-Center of National Center for Apple Improvement, College of Horticulture, Northwest Agriculture & Forestry University, Yangling, Xianyang 712100, China; (S.L.); (M.M.T.); (T.W.); (L.X.); (J.M.); (L.X.)
| | - Xiaoyun Zhang
- The Key Laboratory of Special Fruits and Vegetables Cultivation Physiology and Germplasm Resources Utilization in Xinjiang Production and Construction Group, College of Agriculture, Shihezi University, Shihezi 832003, China;
| | - Jiangping Mao
- Yangling Sub-Center of National Center for Apple Improvement, College of Horticulture, Northwest Agriculture & Forestry University, Yangling, Xianyang 712100, China; (S.L.); (M.M.T.); (T.W.); (L.X.); (J.M.); (L.X.)
| | - Anam Ayyoub
- College of Life Sciences, Northwest Agriculture & Forestry University, Yangling, Xianyang 712100, China;
| | - Libo Xing
- Yangling Sub-Center of National Center for Apple Improvement, College of Horticulture, Northwest Agriculture & Forestry University, Yangling, Xianyang 712100, China; (S.L.); (M.M.T.); (T.W.); (L.X.); (J.M.); (L.X.)
| | - Dong Zhang
- Yangling Sub-Center of National Center for Apple Improvement, College of Horticulture, Northwest Agriculture & Forestry University, Yangling, Xianyang 712100, China; (S.L.); (M.M.T.); (T.W.); (L.X.); (J.M.); (L.X.)
- Correspondence: (D.Z.); (Y.S.)
| | - Yun Shao
- Yangling Sub-Center of National Center for Apple Improvement, College of Horticulture, Northwest Agriculture & Forestry University, Yangling, Xianyang 712100, China; (S.L.); (M.M.T.); (T.W.); (L.X.); (J.M.); (L.X.)
- Correspondence: (D.Z.); (Y.S.)
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11
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Zhang X, Tahir MM, Li S, Mao J, Nawaz MA, Liu Y, Li K, Xing L, Niu J, Zhang D. Transcriptome analysis reveals the inhibitory nature of high nitrate during adventitious roots formation in the apple rootstock. PHYSIOLOGIA PLANTARUM 2021; 173:867-882. [PMID: 34142369 DOI: 10.1111/ppl.13480] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Revised: 05/19/2021] [Accepted: 06/08/2021] [Indexed: 06/12/2023]
Abstract
In the process of vegetative propagation of apple rootstocks, the development of adventitious roots (ARs) has crucial importance. Nitrate is an essential nutrient necessary for plant growth; however, the inhibitory effect of high nitrate on ARs formation has not been explored. The physiological and molecular mechanisms underlying ARs inhibition were examined in this study. Stem cuttings of B9 apple rootstock were cultured on two nitrate treatments (T1 = 18.7 mM L-1 and T2 = 37.5 mM L-1 ), where T2 was identified as ARs inhibiting treatment. Morphological and anatomical observations advocating that high availability of nitrate inhibited AR formation by delaying the ARs initiation and emergence stages, where the root number was 287%, and the length was 604.6% lower than the T1 cuttings. Moreover, the contents of endogenous hormones were also elevated in response to T2 at most of the time points, which may cause a hormonal imbalance within the plant body and drive toward ARs inhibition. Furthermore, 3686 genes were differentially expressed by high-throughput sequencing. Out of these, 1797 genes were upregulated, and 1889 genes were downregulated. Approximately 238 genes related to nitrate, hormones, root development, and cell-cycle induction pathways were selected according to their potential to be involved in ARs regulation. This is the first study providing information regarding the inhibitory effect of high nitrate on ARs formation in apple rootstock.
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Affiliation(s)
- Xiaoyun Zhang
- College of Agriculture, The Key Laboratory of Special Fruits and Vegetables Cultivation Physiology and Germplasm Resources Utilization in Xinjiang Production and Construction Group, Shihezi University, Shihezi, China
- College of Horticulture, Yangling Subsidiary Center Project of the National Apple Improvement Center, Northwest Agriculture and Forestry University, Yangling, China
| | - Muhammad Mobeen Tahir
- College of Horticulture, Yangling Subsidiary Center Project of the National Apple Improvement Center, Northwest Agriculture and Forestry University, Yangling, China
| | - Shaohuan Li
- College of Horticulture, Yangling Subsidiary Center Project of the National Apple Improvement Center, Northwest Agriculture and Forestry University, Yangling, China
| | - Jiangping Mao
- College of Horticulture, Yangling Subsidiary Center Project of the National Apple Improvement Center, Northwest Agriculture and Forestry University, Yangling, China
| | - Muhammad Azher Nawaz
- Department of Horticulture, College of Agriculture, University of Sargodha, Sargodha, Pakistan
| | - Yu Liu
- College of Horticulture, Yangling Subsidiary Center Project of the National Apple Improvement Center, Northwest Agriculture and Forestry University, Yangling, China
| | - Ke Li
- College of Horticulture, Yangling Subsidiary Center Project of the National Apple Improvement Center, Northwest Agriculture and Forestry University, Yangling, China
| | - Libo Xing
- College of Horticulture, Yangling Subsidiary Center Project of the National Apple Improvement Center, Northwest Agriculture and Forestry University, Yangling, China
| | - Jianxin Niu
- College of Agriculture, The Key Laboratory of Special Fruits and Vegetables Cultivation Physiology and Germplasm Resources Utilization in Xinjiang Production and Construction Group, Shihezi University, Shihezi, China
| | - Dong Zhang
- College of Horticulture, Yangling Subsidiary Center Project of the National Apple Improvement Center, Northwest Agriculture and Forestry University, Yangling, China
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12
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Dob A, Lakehal A, Novak O, Bellini C. Jasmonate inhibits adventitious root initiation through repression of CKX1 and activation of RAP2.6L transcription factor in Arabidopsis. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:7107-7118. [PMID: 34329421 PMCID: PMC8547155 DOI: 10.1093/jxb/erab358] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 07/28/2021] [Indexed: 05/04/2023]
Abstract
Adventitious rooting is a de novo organogenesis process that enables plants to propagate clonally and cope with environmental stresses. Adventitious root initiation (ARI) is controlled by interconnected transcriptional and hormonal networks, but there is little knowledge of the genetic and molecular programs orchestrating these networks. Thus, we have applied genome-wide transcriptome profiling to elucidate the transcriptional reprogramming events preceding ARI. These reprogramming events are associated with the down-regulation of cytokinin (CK) signaling and response genes, which could be triggers for ARI. Interestingly, we found that CK free base (iP, tZ, cZ, and DHZ) content declined during ARI, due to down-regulation of de novo CK biosynthesis and up-regulation of CK inactivation pathways. We also found that MYC2-dependent jasmonate (JA) signaling inhibits ARI by down-regulating the expression of the CYTOKININ OXIDASE/DEHYDROGENASE1 (CKX1) gene. We also demonstrated that JA and CK synergistically activate expression of the transcription factor RELATED to APETALA2.6 LIKE (RAP2.6L), and constitutive expression of this transcription factor strongly inhibits ARI. Collectively, our findings reveal that previously unknown genetic interactions between JA and CK play key roles in ARI.
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Affiliation(s)
- Asma Dob
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90736 Umeå, Sweden
| | - Abdellah Lakehal
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90736 Umeå, Sweden
- Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Ondrej Novak
- Laboratory of Growth Regulators, Faculty of Science, Palacký University and Institute of Experimental Botany, Academy of Sciences of the Czech Republic, 78371 Olomouc, Czech Republic
- Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Catherine Bellini
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90736 Umeå, Sweden
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, FR-78000 Versailles, France
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Sharma M, Singh D, Saksena HB, Sharma M, Tiwari A, Awasthi P, Botta HK, Shukla BN, Laxmi A. Understanding the Intricate Web of Phytohormone Signalling in Modulating Root System Architecture. Int J Mol Sci 2021; 22:ijms22115508. [PMID: 34073675 PMCID: PMC8197090 DOI: 10.3390/ijms22115508] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 05/11/2021] [Accepted: 05/13/2021] [Indexed: 12/12/2022] Open
Abstract
Root system architecture (RSA) is an important developmental and agronomic trait that is regulated by various physical factors such as nutrients, water, microbes, gravity, and soil compaction as well as hormone-mediated pathways. Phytohormones act as internal mediators between soil and RSA to influence various events of root development, starting from organogenesis to the formation of higher order lateral roots (LRs) through diverse mechanisms. Apart from interaction with the external cues, root development also relies on the complex web of interaction among phytohormones to exhibit synergistic or antagonistic effects to improve crop performance. However, there are considerable gaps in understanding the interaction of these hormonal networks during various aspects of root development. In this review, we elucidate the role of different hormones to modulate a common phenotypic output, such as RSA in Arabidopsis and crop plants, and discuss future perspectives to channel vast information on root development to modulate RSA components.
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14
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Chen K, Guo B, Yu C, Chen P, Chen J, Gao G, Wang X, Zhu A. Comparative Transcriptome Analysis Provides New Insights into the Molecular Regulatory Mechanism of Adventitious Root Formation in Ramie ( Boehmeria nivea L.). PLANTS 2021; 10:plants10010160. [PMID: 33467608 PMCID: PMC7830346 DOI: 10.3390/plants10010160] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 12/18/2020] [Accepted: 01/05/2021] [Indexed: 11/16/2022]
Abstract
The occurrence of adventitious roots is necessary for the survival of cuttings. In this study, comparative transcriptome analysis between two ramie (Boehmeria nivea L.) varieties with different adventitious root (AR) patterns was performed by mRNA-Seq before rooting (control, CK) and 10 days water-induced adventitious rooting (treatment, T) to reveal the regulatory mechanism of rooting. Characterization of the two ramie cultivars, Zhongzhu No 2 (Z2) and Huazhu No 4 (H4), indicated that Z2 had a high adventitious rooting rate but H4 had a low rooting rate. Twelve cDNA libraries of the two varieties were constructed, and a total of 26,723 genes were expressed. In the non-water culture condition, the number of the distinctive genes in H4 was 2.7 times of that in Z2, while in the water culture condition, the number of the distinctive genes in Z2 was nearly 2 times of that in H4. A total of 4411 and 5195 differentially expressed genes (DEGs) were identified in the comparison of H4CK vs. H4T and Z2CK vs. Z2T, respectively. After the water culture, more DEGs were upregulated in Z2, but more DEGs were downregulated in H4. Gene ontology (GO) functional analysis of the DEGs indicated that the polysaccharide metabolic process, carbohydrate metabolic process, cellular carbohydrate metabolic process, cell wall macromolecule metabolic process, and photosystem GO terms were distinctively significantly enriched in H4. Simultaneously, Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis showed that photosynthesis, photosynthesis antenna proteins, and starch and sucrose metabolism pathways were distinctively significantly enriched in H4. Moreover, KEGG analysis showed that jasmonic acid (JA) could interact with ethylene to regulate the occurrence and number of AR in Z2. This study reveals the transcriptomic divergence of two ramie varieties with high and low adventitious rooting rates, and provides insights into the molecular regulatory mechanism of AR formation in ramie.
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15
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Mao J, Niu C, Li K, Chen S, Tahir MM, Han M, Zhang D. Melatonin promotes adventitious root formation in apple by promoting the function of MdWOX11. BMC PLANT BIOLOGY 2020; 20:536. [PMID: 33243138 PMCID: PMC7690037 DOI: 10.1186/s12870-020-02747-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Accepted: 11/19/2020] [Indexed: 05/27/2023]
Abstract
BACKGROUND Melatonin (MT) is important for plant growth and development; however, it is not known whether MT is involved in apple adventitious root (AR) development. In this study, we treated Malus prunifolia (MP) at four different stages of AR development, and analyzed the level of the endogenous hormones MT, auxin (IAA), zeatin-riboside (ZR), abscisic acid (ABA), and gibberellins (GA1 + 3) in all four treatment groups and the untreated control group. The expression of MT, IAA biosynthesis, transport and signal transduction, the cell cycle, and root development related genes were quantified by RT-qPCR. The function of MdWOX11 was analyzed in transgenic apple plants. RESULTS The promotion of AR development by MT was dependent on the stage of AR induction between 0 and 2 d in apple rootstocks. MT-treatment increased the level of IAA and crosstalk existed between MT and IAA during AR formation. The expression of MdWOX11 was induced by MT treatment and positively regulated AR formation in apple. Furthermore, transgenic lines that overexpressed MdWOX11 lines produced more ARs than 'GL3'. Phenotypic analysis indicated that MdWOX11 overexpression lines were more sensitive to exogenous MT treatment than 'GL3', suggesting that MdWOX11 regulates AR formation in response to MT in apple rootstock. CONCLUSIONS MT promotes AR formation mainly during the AR induction stage by inducing IAA levels and upregulating MdWOX11.
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Affiliation(s)
- Jiangping Mao
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100, China
- College of Life Science, Northwest Agriculture & Forestry University, Yangling, 712100, China
| | - Chundong Niu
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100, China
| | - Ke Li
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100, China
| | - Shiyue Chen
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100, China
| | - Muhammad Mobeen Tahir
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100, China
| | - Mingyu Han
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100, China
| | - Dong Zhang
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100, China.
- College of Life Science, Northwest Agriculture & Forestry University, Yangling, 712100, China.
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16
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Mao J, Niu C, Li K, Chen S, Tahir MM, Han M, Zhang D. Melatonin promotes adventitious root formation in apple by promoting the function of MdWOX11. BMC PLANT BIOLOGY 2020; 20:536. [PMID: 33243138 DOI: 10.21203/rs.3.rs-29239/v1] [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: 05/22/2020] [Accepted: 11/19/2020] [Indexed: 05/27/2023]
Abstract
BACKGROUND Melatonin (MT) is important for plant growth and development; however, it is not known whether MT is involved in apple adventitious root (AR) development. In this study, we treated Malus prunifolia (MP) at four different stages of AR development, and analyzed the level of the endogenous hormones MT, auxin (IAA), zeatin-riboside (ZR), abscisic acid (ABA), and gibberellins (GA1 + 3) in all four treatment groups and the untreated control group. The expression of MT, IAA biosynthesis, transport and signal transduction, the cell cycle, and root development related genes were quantified by RT-qPCR. The function of MdWOX11 was analyzed in transgenic apple plants. RESULTS The promotion of AR development by MT was dependent on the stage of AR induction between 0 and 2 d in apple rootstocks. MT-treatment increased the level of IAA and crosstalk existed between MT and IAA during AR formation. The expression of MdWOX11 was induced by MT treatment and positively regulated AR formation in apple. Furthermore, transgenic lines that overexpressed MdWOX11 lines produced more ARs than 'GL3'. Phenotypic analysis indicated that MdWOX11 overexpression lines were more sensitive to exogenous MT treatment than 'GL3', suggesting that MdWOX11 regulates AR formation in response to MT in apple rootstock. CONCLUSIONS MT promotes AR formation mainly during the AR induction stage by inducing IAA levels and upregulating MdWOX11.
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Affiliation(s)
- Jiangping Mao
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100, China
- College of Life Science, Northwest Agriculture & Forestry University, Yangling, 712100, China
| | - Chundong Niu
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100, China
| | - Ke Li
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100, China
| | - Shiyue Chen
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100, China
| | - Muhammad Mobeen Tahir
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100, China
| | - Mingyu Han
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100, China
| | - Dong Zhang
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100, China.
- College of Life Science, Northwest Agriculture & Forestry University, Yangling, 712100, China.
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17
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Mao J, Niu C, Li K, Mobeen Tahir M, Khan A, Wang H, Li S, Liang Y, Li G, Yang Z, Zuo L, Han M, Ren X, An N, Zhang D. Exogenous 6-benzyladenine application affects root morphology by altering hormone status and gene expression of developing lateral roots in Malus hupehensis. PLANT BIOLOGY (STUTTGART, GERMANY) 2020; 22:1150-1159. [PMID: 32597557 DOI: 10.1111/plb.13154] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 06/17/2020] [Indexed: 06/11/2023]
Abstract
Malus hupehensis is an extensively used apple rootstock in China. In the current study, M. hupehensis seedlings were treated with exogenous 2.2 µm 6-benzyladenine (6-BA) so as to investigate the mechanism by which 6-BA affects lateral root development. The results indicate that 6-BA treatment promotes elongation and thickening of both root and shoot in M. hupehensis, but reduces the number of lateral roots, as well as reducing the auxin level after 6-BA treatment. Moreover, MhAHK4, MhRR1 and MhRR2 were also significantly up-regulated in response to 6-BA treatment. Expression levels of auxin synthesis- and transport-related genes, such as MhYUCCA6, MhYUCCA10, MhPIN1 and MhPIN2, were down-regulated, which corresponds with lower auxin levels in the 6-BA-treated seedlings. A negative regulator of auxin, MhIAA3, was induced by 6-BA treatment, leading to reduced expression of MhARF7 and MhARF19 in 6-BA-treated seedlings. As a result, expression of MhWOX11, MhWOX5, MhLBD16 and MhLBD29 was blocked, which in turn inhibited lateral root initiation. In addition, a lower auxin level decreased expression of MhRR7 and MhRR15, which repressed expression of key transcription factors associated with root development, thus inhibiting lateral root development. In contrast, 6-BA treatment promoted secondary growth (thickening) of the root by inducing expression of MhCYCD3;1 and MhCYCD3;2. Collectively, the changes in hormone levels and gene expression resulted in a reduced number of lateral roots and thicker roots in 6-BA-treated plants.
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Affiliation(s)
- J Mao
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, China
- College of Life Science, Northwest Agriculture & Forestry University, Yangling, China
| | - C Niu
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, China
| | - K Li
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, China
| | - M Mobeen Tahir
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, China
| | - A Khan
- Department of Agricultural Sciences, the University of Haripur, Haripur, Pakistan
| | - H Wang
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, China
| | - S Li
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, China
| | - Y Liang
- Beijing Ori-Gene Science and Technology Corp., Ltd., Beijing, China
| | - G Li
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, China
| | - Z Yang
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, China
| | - L Zuo
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, China
| | - M Han
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, China
| | - X Ren
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, China
| | - N An
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, China
- College of Life Science, Northwest Agriculture & Forestry University, Yangling, China
| | - D Zhang
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, China
- College of Life Science, Northwest Agriculture & Forestry University, Yangling, China
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18
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Bai T, Dong Z, Zheng X, Song S, Jiao J, Wang M, Song C. Auxin and Its Interaction With Ethylene Control Adventitious Root Formation and Development in Apple Rootstock. FRONTIERS IN PLANT SCIENCE 2020; 11:574881. [PMID: 33178245 PMCID: PMC7593273 DOI: 10.3389/fpls.2020.574881] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 09/14/2020] [Indexed: 06/11/2023]
Abstract
Adventitious root (AR) formation is indispensable for vegetative asexual propagation. Indole-3-butyric acid (IBA) functioned indirectly as precursor of IAA in regulating AR formation. Ethylene affects auxin synthesis, transport, and/or signaling processes. However, the interactions between auxin and ethylene that control AR formation in apple have not been elucidated. In this study, we investigated the effects of IBA and its interaction with ethylene on AR development in apple. The results revealed that IBA stimulated the formation of root primordia, increased the number of ARs, and upregulated expression of genes (MdWOX11, MdLBD16, and MdLBD29) involved in AR formation. Comparison of different periods of IBA application indicated that IBA was necessary for root primordium formation, while long time IBA treatment obviously inhibited root elongation. RNA-seq analysis revealed that many plant hormone metabolism and signal transduction related genes were differentially expressed. IBA stimulated the production of ethylene during AR formation. Auxin inhibiting ARs elongation depended on ethylene. Together, our results suggest that the inhibitory role of auxin on AR elongation in apples is partially mediated by stimulated ethylene production.
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Pan R, Liu Y, Buitrago S, Jiang W, Gao H, Han H, Wu C, Wang Y, Zhang W, Yang X. Adventitious root formation is dynamically regulated by various hormones in leaf-vegetable sweetpotato cuttings. JOURNAL OF PLANT PHYSIOLOGY 2020; 253:153267. [PMID: 32858442 DOI: 10.1016/j.jplph.2020.153267] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Revised: 08/12/2020] [Accepted: 08/12/2020] [Indexed: 06/11/2023]
Abstract
Leaf-vegetable sweetpotato is an important cash crop that is of high nutritional value. Cuttage is the most convenient method for large-scale propagation. However, the rate and number of adventitious roots (ARs) formation vary significantly among different cultivar cuttings. In this study, two varieties, NC1 and FC13-14, were used to compare the rate of ARs formation. The cumulative results of root morphology showed that in NC1 total root length, total root surface area, total root volume, and root tips were 3.7, 3.5, 3.2, and 2.4 times greater, respectively, than those of FC13-14 at 7 d, indicating that the ARs formation and growth were faster in NC1. In addition, the biomass of aboveground and underground parts in NC1 was 3.6 and 1.3 times more, respectively, than that of FC13-14 at 7 d after cutting, suggesting that the rapid ARs formation rate contributed to the growth and yield of stems and leaves. The analysis of plant water potential showed that NC1 exhibiting higher water potential prevented leaf wilting. Gene expression levels of 22 root-related genes revealed differential expression during different developmental periods. Interestingly, YUCCA family genes had elevated transcript abundance at 0, 12, 24, and 36 h. Moreover, analysis of hormones including indole-3-acetic acid (IAA), ethylene (ETH), abscisic acid (ABA), brassinolide (BR), jasmonic acid (JA), gibberellin (GA), and cytokinin (CTK) revealed varied contents during different developmental stages. Cumulative evidence demonstrated that gene expression profiles and hormone content of IAA, ETH, and BR were significantly higher in NC1 roots than in FC13-14 roots following all time periods, while the amount of JA increased and was higher in FC13-14 than in NC1 from 0 to 72 h. This indicates that IAA, BR, and ETH play positive roles and JA has a negative effect on ARs formation. Moreover, ETH takes effect earlier than BR, while IAA and JA have functions throughout the whole process. The findings above were validated by the application of exogenous hormones and hormone synthesis inhibitors. This study reveals the preliminary regulation of ARs formation in leaf-vegetable sweetpotato cuttings and thus contributes to further clarification of the molecular mechanism of multiple hormone interactions.
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Affiliation(s)
- Rui Pan
- Engineering Research Centre of Ecology and Agricultural Use of Wetland, Ministry of Education/ Hubei Collaborative Innovation Center for Grain Industry, Yangtze University, Jingzhou, 434025, China
| | - Yi Liu
- Engineering Research Centre of Ecology and Agricultural Use of Wetland, Ministry of Education/ Hubei Collaborative Innovation Center for Grain Industry, Yangtze University, Jingzhou, 434025, China; Hubei Key Laboratory of Food Crops Germplasm and Genetic Improvement, Institute of Food Corps/ Hubei Sweetpotato Engineering and Technology Research Centre, Hubei Academy of Agricultural Sciences, Wuhan, 430064, China
| | - Sebastian Buitrago
- Engineering Research Centre of Ecology and Agricultural Use of Wetland, Ministry of Education/ Hubei Collaborative Innovation Center for Grain Industry, Yangtze University, Jingzhou, 434025, China
| | - Wei Jiang
- Engineering Research Centre of Ecology and Agricultural Use of Wetland, Ministry of Education/ Hubei Collaborative Innovation Center for Grain Industry, Yangtze University, Jingzhou, 434025, China
| | - Haoran Gao
- Engineering Research Centre of Ecology and Agricultural Use of Wetland, Ministry of Education/ Hubei Collaborative Innovation Center for Grain Industry, Yangtze University, Jingzhou, 434025, China
| | - Hui Han
- Engineering Research Centre of Ecology and Agricultural Use of Wetland, Ministry of Education/ Hubei Collaborative Innovation Center for Grain Industry, Yangtze University, Jingzhou, 434025, China
| | - Chu Wu
- College of Horticulture & Gardening, Yangtze University, Jingzhou, 434025, China
| | - Yulu Wang
- Engineering Research Centre of Ecology and Agricultural Use of Wetland, Ministry of Education/ Hubei Collaborative Innovation Center for Grain Industry, Yangtze University, Jingzhou, 434025, China
| | - Wenying Zhang
- Engineering Research Centre of Ecology and Agricultural Use of Wetland, Ministry of Education/ Hubei Collaborative Innovation Center for Grain Industry, Yangtze University, Jingzhou, 434025, China.
| | - Xinsun Yang
- Hubei Key Laboratory of Food Crops Germplasm and Genetic Improvement, Institute of Food Corps/ Hubei Sweetpotato Engineering and Technology Research Centre, Hubei Academy of Agricultural Sciences, Wuhan, 430064, China.
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20
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Cheng C, Che Q, Su S, Liu Y, Wang Y, Xu X. Genome-wide identification and characterization of Respiratory Burst Oxidase Homolog genes in six Rosaceae species and an analysis of their effects on adventitious rooting in apple. PLoS One 2020; 15:e0239705. [PMID: 32976536 PMCID: PMC7518606 DOI: 10.1371/journal.pone.0239705] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Accepted: 09/12/2020] [Indexed: 11/25/2022] Open
Abstract
Adventitious root formation is essential for plant propagation, development, and response to various stresses. Reactive oxygen species (ROS) are essential for adventitious root formation. However, information on Respiratory Burst Oxidase Homolog (RBOH), a key enzyme that catalyzes the production ROS, remains limited in woody plants. Here, a total of 44 RBOH genes were identified from six Rosaceae species (Malus domestica, Prunus avium, Prunus dulcis 'Texas’, Rubus occidentalis, Fragaria vesca and Rosa chinensis), including ten from M. domestica. Their phylogenetic relationships, conserved motifs and gene structures were analyzed. Exogenous treatment with the RBOH protein inhibitor diphenyleneiodonium (DPI) completely inhibited adventitious root formation, whereas exogenous H2O2 treatment enhanced adventitious root formation. In addition, we found that ROS accumulated during adventitious root primordium inducing process. The expression levels of MdRBOH-H, MdRBOH-J, MdRBOH-A, MdRBOH-E1 and MdRBOH-K increased more than two-fold at days 3 or 9 after auxin treatment. In addition, cis-acting element analysis revealed that the MdRBOH-E1 promoter contained an auxin-responsive element and the MdRBOH-K promoter contained a meristem expression element. Based on the combined results from exogenous DPI and H2O2 treatment, spatiotemporal expression profiling, and cis-element analysis, MdRBOH-E1 and MdRBOH-K appear to be candidates for the control of adventitious rooting in apple.
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Affiliation(s)
- Chenxia Cheng
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
| | - Qinqin Che
- Qingdao Key Laboratory of Genetic Development and Breeding in Horticultural Plants, Qingdao Agricultural University, Qingdao, China
| | - Shenghui Su
- Qingdao Key Lab of Modern Agriculture Quality and Safety Engineering, Qingdao Agricultural University, Qingdao, China
| | - Yuan Liu
- Laixi Elite Cultivars Propagation Farm, Laixi, Qingdao, China
| | - Yongzhang Wang
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
| | - Xiaozhao Xu
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
- * E-mail:
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21
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Alallaq S, Ranjan A, Brunoni F, Novák O, Lakehal A, Bellini C. Red Light Controls Adventitious Root Regeneration by Modulating Hormone Homeostasis in Picea abies Seedlings. FRONTIERS IN PLANT SCIENCE 2020; 11:586140. [PMID: 33014006 PMCID: PMC7509059 DOI: 10.3389/fpls.2020.586140] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Accepted: 08/24/2020] [Indexed: 05/02/2023]
Abstract
Vegetative propagation relies on the capacity of plants to regenerate de novo adventitious roots (ARs), a quantitative trait controlled by the interaction of endogenous factors, such as hormones and environmental cues among which light plays a central role. However, the physiological and molecular components mediating light cues during AR initiation (ARI) remain largely elusive. Here, we explored the role of red light (RL) on ARI in de-rooted Norway spruce seedlings. We combined investigation of hormone metabolism and gene expression analysis to identify potential signaling pathways. We also performed extensive anatomical characterization to investigate ARI at the cellular level. We showed that in contrast to white light, red light promoted ARI likely by reducing jasmonate (JA) and JA-isoleucine biosynthesis and repressing the accumulation of isopentyl-adenine-type cytokinins. We demonstrated that exogenously applied JA and/or CK inhibit ARI in a dose-dependent manner and found that they possibly act in the same pathway. The negative effect of JA on ARI was confirmed at the histological level. We showed that JA represses the early events of ARI. In conclusion, RL promotes ARI by repressing the accumulation of the wound-induced phytohormones JA and CK.
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Affiliation(s)
- Sanaria Alallaq
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Umeå, Sweden
- Department of Biology, College of Science for Women, Baghdad University, Baghdad, Iraq
| | - Alok Ranjan
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Umeå, Sweden
| | - Federica Brunoni
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Umeå, Sweden
| | - Ondřej Novák
- Umeå Plant Science Centre, Department of Forest Genetics and Physiology, Swedish Agriculture University, Umea, Sweden
- Laboratory of Growth Regulators, Faculty of Science, Palacký University and Institute of Experimental Botany, The Czech Academy of Sciences, Olomouc, Czechia
| | - Abdellah Lakehal
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Umeå, Sweden
| | - Catherine Bellini
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Umeå, Sweden
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, Versailles, France
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22
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Guan L, Li Y, Huang K, Cheng ZM(M. Auxin regulation and MdPIN expression during adventitious root initiation in apple cuttings. HORTICULTURE RESEARCH 2020; 7:143. [PMID: 32922815 PMCID: PMC7459121 DOI: 10.1038/s41438-020-00364-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 06/08/2020] [Accepted: 06/11/2020] [Indexed: 05/23/2023]
Abstract
Adventitious root (AR) formation is critical for the efficient propagation of elite horticultural and forestry crops. Despite decades of research, the cellular processes and molecular mechanisms underlying AR induction in woody plants remain obscure. We examined the details of AR formation in apple (Malus domestica) M.9 rootstock, the most widely used dwarf rootstock for intensive production, and investigated the role of polar auxin transport in postembryonic organogenesis. AR formation begins with a series of founder cell divisions and elongation of the interfascicular cambium adjacent to vascular tissues. This process is associated with a relatively high indole acetic acid (IAA) content and hydrolysis of starch grains. Exogenous auxin treatment promoted this cell division, as well as the proliferation and reorganization of the endoplasmic reticulum and Golgi membrane. In contrast, treatment with the auxin transport inhibitor N-1-naphthylphthalamic acid (NPA) inhibited cell division in the basal region of the cuttings and resulted in abnormal cell divisions during the early stage of AR formation. In addition, PIN-FORMED (PIN) transcripts were differentially expressed throughout the whole AR development process. We also detected upregulation of MdPIN8 and MdPIN10 during induction; upregulation of MdPIN4, MdPIN5, and MdPIN8 during extension; and upregulation of all MdPINs during AR initiation. This research provides an improved understanding of the cellular and molecular underpinnings of the AR process in woody plants.
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Affiliation(s)
- Ling Guan
- College of Horticulture, Nanjing Agricultural University, 210095 Nanjing, China
- Institute of Pomology, Jiangsu Academy of Agricultural Sciences, Jiangsu Key Laboratory for Horticultural Crop Genetic Improvement, 210014 Nanjing, China
| | - Yingjun Li
- College of Horticulture, Nanjing Agricultural University, 210095 Nanjing, China
| | - Kaihui Huang
- College of Horticulture, Nanjing Agricultural University, 210095 Nanjing, China
| | - Zong-Ming (Max) Cheng
- College of Horticulture, Nanjing Agricultural University, 210095 Nanjing, China
- Department of Plant Sciences, University of Tennessee, Knoxville, TN 37831 USA
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23
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Zhao D, Wang Y, Feng C, Wei Y, Peng X, Guo X, Guo X, Zhai Z, Li J, Shen X, Li T. Overexpression of MsGH3.5 inhibits shoot and root development through the auxin and cytokinin pathways in apple plants. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 103:166-183. [PMID: 32031710 DOI: 10.1111/tpj.14717] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 01/17/2020] [Accepted: 01/24/2020] [Indexed: 06/10/2023]
Abstract
Phytohormonal interactions are crucial for plant development. Auxin and cytokinin (CK) both play critical roles in regulating plant growth and development; however, the interaction between these two phytohormones is complex and not fully understood. Here, we isolated a wild apple (Malus sieversii Roem) GRETCHEN HAGEN3 (GH3) gene, MsGH3.5, encoding an indole-3-acetic acid (IAA)-amido synthetase. Overexpression of MsGH3.5 significantly reduced the free IAA content and increased the content of some IAA-amino acid conjugates, and MsGH3.5-overexpressing lines were dwarfed and produced fewer adventitious roots (ARs) than the control. This phenotype is consistent with the role of GH3 in conjugating excess free active IAA to amino acids in auxin homeostasis. Surprisingly, overexpression of MsGH3.5 significantly increased CK concentrations in the whole plant, and altered the expression of genes involved in CK biosynthesis, metabolism and signaling. Furthermore, exogenous CK application induced MsGH3.5 expression through the activity of the CK type-B response regulator, MsRR1a, which mediates the CK primary response. MsRR1a activated MsGH3.5 expression by directly binding to its promoter, linking auxin and CK signaling. Plants overexpressing MsRR1a also displayed fewer ARs, in agreement with the regulation of MsGH3.5 expression by MsRR1a. Taken together, we reveal that MsGH3.5 affects apple growth and development by modulating auxin and CK levels and signaling pathways. These findings provide insight into the interaction between the auxin and CK pathways, and might have substantial implications for efforts to improve apple architecture.
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Affiliation(s)
- Di Zhao
- Department of Pomology, College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Yantao Wang
- Department of Pomology, College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Chen Feng
- Department of Pomology, College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Yan Wei
- Department of Pomology, College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Xiang Peng
- Department of Pomology, College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Xiao Guo
- Department of Pomology, College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Xinwei Guo
- The Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Beijing, 100193, China
| | - Zefeng Zhai
- Department of Pomology, College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Jian Li
- Department of Pomology, College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Xiaoshuai Shen
- Department of Pomology, College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Tianhong Li
- Department of Pomology, College of Horticulture, China Agricultural University, Beijing, 100193, China
- Beijing Collaborative Innovation Center for Eco-environmental Improvement with Forestry and Fruit Trees, Beijing, 102206, China
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24
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Zhang Y, Yang X, Cao P, Xiao Z, Zhan C, Liu M, Nvsvrot T, Wang N. The bZIP53-IAA4 module inhibits adventitious root development in Populus. JOURNAL OF EXPERIMENTAL BOTANY 2020; 71:3485-3498. [PMID: 32076710 PMCID: PMC7307859 DOI: 10.1093/jxb/eraa096] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2019] [Accepted: 02/19/2020] [Indexed: 05/04/2023]
Abstract
Adventitious roots (ARs) are important for some plants that depend on clonal propagation. In this study, we demonstrate that a salt-responsive gene module is involved in the negative regulation of AR development in poplar. In this module, the expression of bZIP53 is induced by salt stress and it encodes a transcription factor with transactivation activity. Overexpression or induced expression of bZIP53 in poplar lines resulted in inhibition of AR growth, while heterologous overexpression of bZIP53 in Arabidopsis resulted in a similar phenotype. Results from RNA-seq and RT-qPCR assays predicted IAA4-1 and IAA4-2 to be downstream genes that were regulated by bZIP53. Further investigation of protein-DNA interactions using yeast one-hybrid, electrophoretic mobility shift, dual luciferase reporter, and GUS co-expression assays also showed that IAA4-1/2 were the genes that were directly regulated by bZIP53. Induced-expression IAA4-1/2 transgenic poplar lines also showed inhibited AR growth. In addition, both poplar bZIP53 and IAA4-1/2 showed a response to salt stress. On the basis of these results, we conclude that the bZIP53-IAA4 module is involved in the negative regulation of AR development in poplar.
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Affiliation(s)
- Yan Zhang
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Xiaoqing Yang
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Pei Cao
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Zheng’ang Xiao
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Chang Zhan
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Meifeng Liu
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Tashbek Nvsvrot
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Nian Wang
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
- Hubei Engineering Technology Research Center for Forestry Information, Huazhong Agricultural University, Wuhan, China
- Correspondence:
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Liang B, Sun Y, Li Z, Zhang X, Yin B, Zhou S, Xu J. Crop Load Influences Growth and Hormone Changes in the Roots of "Red Fuji" Apple. FRONTIERS IN PLANT SCIENCE 2020; 11:665. [PMID: 32528508 PMCID: PMC7265680 DOI: 10.3389/fpls.2020.00665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 04/29/2020] [Indexed: 06/11/2023]
Abstract
Crop load has a substantial impact on growth of the aerial and belowground parts of apple trees. Here, we examined the effects of different crop loads on growth and hormone levels in apple roots. A crop load of 1.5 (T1.5) fruits per cm2 trunk cross-sectional area (TCSA) treatment resulted in lower root growth vigor, while non-fruiting (T0) and T0.4 conditions showed higher root growth vigor. In all treatments, dead roots increased in length 90 days after full bloom (DAFB), whereas live roots were more abundant at about 50 and 170 DAFB, showing a bimodal curve. During each root growth peak, levels of cytokinins (CTKs), indole acetic acid (IAA), and gibberellic acid (GA3) were higher. Moreover, hormone levels gradually decreased with increasing crop load within each peak. Root turnover tended to decrease with decreasing crop load. These findings indicate that root growth and hormone contents were positively correlated during the fruit growth phase, and that the negative impact of crop load on root growth may have been caused by hormone level decreases.
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26
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Physiological and Transcriptomic Changes during the Early Phases of Adventitious Root Formation in Mulberry Stem Hardwood Cuttings. Int J Mol Sci 2019; 20:ijms20153707. [PMID: 31362363 PMCID: PMC6696018 DOI: 10.3390/ijms20153707] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 07/25/2019] [Accepted: 07/26/2019] [Indexed: 01/08/2023] Open
Abstract
The initiation and induction of root primordia are of great importance for adventitious root (AR) formation in cutting propagation of horticultural and forestry crops. However, the underlying mechanisms orchestrating these early phases of AR formation remain largely unexplored. Here, we investigated the physiological and transcriptomic changes during the early AR phases in mulberry stem hardwood cuttings. The results showed that the concentrations of soluble proteins increased, whereas concentrations of soluble sugars and starch were decreased. Indole-3-acetic acid (IAA) and zeatin had a rapid transit peak at 6 h after planting (hAP) and declined thereafter. The activities of peroxidase and catalase persistently increased and indole-3-acetic acid oxidase was maintained at a higher stable level from 0 hAP, while the activities of polyphenol oxidase fluctuated with soluble phenolics and IAA levels. The comparative transcriptome identified 4276 common genes that were differentially regulated at −6, 0 and 54 hAP. They were separated into five clusters with distinct biological functions such as defense response and photosynthesis. Considerable common genes were assigned to pathways of sugar metabolism, mitogen-activated protein kinase, and circadian rhythm. The gene co-expression network analysis revealed three major co-expressed modules involved in stress responses, hormone signaling, energy metabolism, starch metabolism, and circadian rhythm. These findings demonstrate the positive effect of auxin on AR induction, and uncovered the crucial roles of stress responses, hormone signaling and circadian rhythm in coordinating the physiological changes during the early phases of AR formation in mulberry stem hardwood cuttings.
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Teixeira da Silva JA, Gulyás A, Magyar-Tábori K, Wang MR, Wang QC, Dobránszki J. In vitro tissue culture of apple and other Malus species: recent advances and applications. PLANTA 2019; 249:975-1006. [PMID: 30788577 DOI: 10.1007/s00425-019-03100-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 01/25/2019] [Indexed: 05/08/2023]
Abstract
Studies on the tissue culture of apple have allowed for molecular, biotechnological and applied breeding research to advance. In the past 8 years, over 100 papers advancing basic biology, genetic transformation and cryobiology have emerged. Apple (Malus × domestica Borkh.; Rosaceae) is an important fruit crop grown mainly in temperate regions of the world. In vitro tissue culture is a biotechnological technique that has been used to genetically improve cultivars (scions) and rootstocks. This updated review presents a synthesis of findings related to the tissue culture of apple and other Malus spp. between 2010 and 2018. Increasingly complex molecular studies that are examining the apple genome, for example, in a bid to identify the cause of epigenetic mutations and the role of transposable elements in this process would benefit from genetically stable source material, which can be produced in vitro. Several notable or curious in vitro culture methods have been reported to improve shoot regeneration and induce the production of tetraploids in apple cultivars and rootstocks. Existing studies have revealed the molecular mechanism underlying the inhibition of adventitious roots by cytokinin. The use of the plant growth correction factor allows hypothetical shoot production from leaf-derived thin cell layers relative to conventional leaf explants to be determined. This updated review will allow novices and established researchers to advance apple and Malus biotechnology and breeding programs.
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Affiliation(s)
- Jaime A Teixeira da Silva
- , P.O. Box 7, Ikenobe, 3011-2, Kagawa-ken, 761-0799, Japan.
- Research Institute of Nyíregyháza, IAREF, University of Debrecen, P.O. Box 12, Nyíregyháza, 4400, Hungary.
| | - Andrea Gulyás
- Research Institute of Nyíregyháza, IAREF, University of Debrecen, P.O. Box 12, Nyíregyháza, 4400, Hungary.
| | - Katalin Magyar-Tábori
- Research Institute of Nyíregyháza, IAREF, University of Debrecen, P.O. Box 12, Nyíregyháza, 4400, Hungary.
| | - Min-Rui Wang
- State Key Laboratory of Crop Stress Biology in Arid Region, College of Horticulture, Northwest Agriculture and Forestry University, Yangling, 712100, Shaanxi, People's Republic of China.
| | - Qiao-Chun Wang
- State Key Laboratory of Crop Stress Biology in Arid Region, College of Horticulture, Northwest Agriculture and Forestry University, Yangling, 712100, Shaanxi, People's Republic of China.
| | - Judit Dobránszki
- Research Institute of Nyíregyháza, IAREF, University of Debrecen, P.O. Box 12, Nyíregyháza, 4400, Hungary.
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