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Du SX, Wang LL, Yu WP, Xu SX, Chen L, Huang W. Appropriate induction of TOC1 ensures optimal MYB44 expression in ABA signaling and stress response in Arabidopsis. PLANT, CELL & ENVIRONMENT 2024; 47:3046-3062. [PMID: 38654596 DOI: 10.1111/pce.14922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2023] [Revised: 03/19/2024] [Accepted: 04/09/2024] [Indexed: 04/26/2024]
Abstract
Plants possess the remarkable ability to integrate the circadian clock with various signalling pathways, enabling them to quickly detect and react to both external and internal stress signals. However, the interplay between the circadian clock and biological processes in orchestrating responses to environmental stresses remains poorly understood. TOC1, a core component of the plant circadian clock, plays a vital role in maintaining circadian rhythmicity and participating in plant defences. Here, our study reveals a direct interaction between TOC1 and the promoter region of MYB44, a key gene involved in plant defence. TOC1 rhythmically represses MYB44 expression, thereby ensuring elevated MYB44 expression at dawn to help the plant in coping with lowest temperatures during diurnal cycles. Additionally, both TOC1 and MYB44 can be induced by cold stress in an Abscisic acid (ABA)-dependent and independent manner. TOC1 demonstrates a rapid induction in response to lower temperatures compared to ABA treatment, suggesting timely flexible regulation of TOC1-MYB44 regulatory module by the circadian clock in ensuring a proper response to diverse stresses and maintaining a balance between normal physiological processes and energy-consuming stress responses. Our study elucidates the role of TOC1 in effectively modulating expression of MYB44, providing insights into the regulatory network connecting the circadian clock, ABA signalling, and stress-responsive genes.
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Affiliation(s)
- Shen-Xiu Du
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, China
| | - Lu-Lu Wang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, China
| | - Wei-Peng Yu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, China
| | - Shu-Xuan Xu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, China
| | - Liang Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, China
| | - Wei Huang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, China
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Peng D, Li L, Wei A, Zhou L, Wang B, Liu M, Lei Y, Xie Y, Li X. TaMYB44-5A reduces drought tolerance by repressing transcription of TaRD22-3A in the abscisic acid signaling pathway. PLANTA 2024; 260:52. [PMID: 39003354 DOI: 10.1007/s00425-024-04485-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 07/08/2024] [Indexed: 07/15/2024]
Abstract
MAIN CONCLUSION TaMYB44-5A identified as a transcription factor negatively regulates drought tolerance in transgenic Arabidopsis. Drought can severely reduce yields throughout the wheat-growing season. Many studies have shown that R2R3-MYB transcription factors are involved in drought stress responses. In this study, the R2R3-MYB transcription factor MYB44-5A was identified in wheat (Triticum aestivum L.) and functionally analyzed. Three homologs of TaMYB44 were isolated, all of which localized to the nucleus. Overexpression of TaMYB44-5A reduced drought tolerance in Arabidopsis thaliana. Further analysis showed that TaMYB44-5A reduced the sensitivity of transgenic Arabidopsis to ABA. Genetic and transcriptional regulation analyses demonstrated that the expression levels of drought- and ABA-responsive genes were downregulated by TaMYB44-5A, and TaMYB44-5A directly bound to the MYB-binding site on the promoter to repress the transcription level of TaRD22-3A. Our results provide insights into a novel molecular pathway in which the R2R3-MYB transcription factor negatively regulates ABA signaling in response to drought stress.
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Affiliation(s)
- De Peng
- State Key Laboratory of Crop Stress Biology in Arid Areas and College of Agronomy, Northwest A&F University, 3 Taicheng Rd, Yangling, 712100, Shaanxi, China
| | - Liqun Li
- State Key Laboratory of Crop Stress Biology in Arid Areas and College of Agronomy, Northwest A&F University, 3 Taicheng Rd, Yangling, 712100, Shaanxi, China
| | - Aosong Wei
- State Key Laboratory of Crop Stress Biology in Arid Areas and College of Agronomy, Northwest A&F University, 3 Taicheng Rd, Yangling, 712100, Shaanxi, China
| | - Ling Zhou
- State Key Laboratory of Crop Stress Biology in Arid Areas and College of Agronomy, Northwest A&F University, 3 Taicheng Rd, Yangling, 712100, Shaanxi, China
| | - Bingxin Wang
- State Key Laboratory of Crop Stress Biology in Arid Areas and College of Agronomy, Northwest A&F University, 3 Taicheng Rd, Yangling, 712100, Shaanxi, China
| | - Mingliu Liu
- State Key Laboratory of Crop Stress Biology in Arid Areas and College of Agronomy, Northwest A&F University, 3 Taicheng Rd, Yangling, 712100, Shaanxi, China
| | - Yanhong Lei
- State Key Laboratory of Crop Stress Biology in Arid Areas and College of Agronomy, Northwest A&F University, 3 Taicheng Rd, Yangling, 712100, Shaanxi, China
| | - Yanzhou Xie
- State Key Laboratory of Crop Stress Biology in Arid Areas and College of Agronomy, Northwest A&F University, 3 Taicheng Rd, Yangling, 712100, Shaanxi, China
| | - Xuejun Li
- State Key Laboratory of Crop Stress Biology in Arid Areas and College of Agronomy, Northwest A&F University, 3 Taicheng Rd, Yangling, 712100, Shaanxi, China.
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3
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Gao H, Ma J, Zhao Y, Zhang C, Zhao M, He S, Sun Y, Fang X, Chen X, Ma K, Pang Y, Gu Y, Dongye Y, Wu J, Xu P, Zhang S. The MYB Transcription Factor GmMYB78 Negatively Regulates Phytophthora sojae Resistance in Soybean. Int J Mol Sci 2024; 25:4247. [PMID: 38673832 PMCID: PMC11050205 DOI: 10.3390/ijms25084247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Revised: 04/08/2024] [Accepted: 04/09/2024] [Indexed: 04/28/2024] Open
Abstract
Phytophthora root rot is a devastating disease of soybean caused by Phytophthora sojae. However, the resistance mechanism is not yet clear. Our previous studies have shown that GmAP2 enhances sensitivity to P. sojae in soybean, and GmMYB78 is downregulated in the transcriptome analysis of GmAP2-overexpressing transgenic hairy roots. Here, GmMYB78 was significantly induced by P. sojae in susceptible soybean, and the overexpressing of GmMYB78 enhanced sensitivity to the pathogen, while silencing GmMYB78 enhances resistance to P. sojae, indicating that GmMYB78 is a negative regulator of P. sojae. Moreover, the jasmonic acid (JA) content and JA synthesis gene GmAOS1 was highly upregulated in GmMYB78-silencing roots and highly downregulated in overexpressing ones, suggesting that GmMYB78 could respond to P. sojae through the JA signaling pathway. Furthermore, the expression of several pathogenesis-related genes was significantly lower in GmMYB78-overexpressing roots and higher in GmMYB78-silencing ones. Additionally, we screened and identified the upstream regulator GmbHLH122 and downstream target gene GmbZIP25 of GmMYB78. GmbHLH122 was highly induced by P. sojae and could inhibit GmMYB78 expression in resistant soybean, and GmMYB78 was highly expressed to activate downstream target gene GmbZIP25 transcription in susceptible soybean. In conclusion, our data reveal that GmMYB78 triggers soybean sensitivity to P. sojae by inhibiting the JA signaling pathway and the expression of pathogenesis-related genes or through the effects of the GmbHLH122-GmMYB78-GmbZIP25 cascade pathway.
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Affiliation(s)
- Hong Gao
- Soybean Research Institute of Northeast Agricultural University/Key Laboratory of Soybean Biology of Chinese Education Ministry, Harbin 150030, China; (H.G.); (J.M.); (Y.Z.); (C.Z.); (M.Z.); (S.H.); (Y.S.); (X.F.); (X.C.); (K.M.); (Y.P.); (Y.G.); (Y.D.)
| | - Jia Ma
- Soybean Research Institute of Northeast Agricultural University/Key Laboratory of Soybean Biology of Chinese Education Ministry, Harbin 150030, China; (H.G.); (J.M.); (Y.Z.); (C.Z.); (M.Z.); (S.H.); (Y.S.); (X.F.); (X.C.); (K.M.); (Y.P.); (Y.G.); (Y.D.)
| | - Yuxin Zhao
- Soybean Research Institute of Northeast Agricultural University/Key Laboratory of Soybean Biology of Chinese Education Ministry, Harbin 150030, China; (H.G.); (J.M.); (Y.Z.); (C.Z.); (M.Z.); (S.H.); (Y.S.); (X.F.); (X.C.); (K.M.); (Y.P.); (Y.G.); (Y.D.)
| | - Chuanzhong Zhang
- Soybean Research Institute of Northeast Agricultural University/Key Laboratory of Soybean Biology of Chinese Education Ministry, Harbin 150030, China; (H.G.); (J.M.); (Y.Z.); (C.Z.); (M.Z.); (S.H.); (Y.S.); (X.F.); (X.C.); (K.M.); (Y.P.); (Y.G.); (Y.D.)
| | - Ming Zhao
- Soybean Research Institute of Northeast Agricultural University/Key Laboratory of Soybean Biology of Chinese Education Ministry, Harbin 150030, China; (H.G.); (J.M.); (Y.Z.); (C.Z.); (M.Z.); (S.H.); (Y.S.); (X.F.); (X.C.); (K.M.); (Y.P.); (Y.G.); (Y.D.)
| | - Shengfu He
- Soybean Research Institute of Northeast Agricultural University/Key Laboratory of Soybean Biology of Chinese Education Ministry, Harbin 150030, China; (H.G.); (J.M.); (Y.Z.); (C.Z.); (M.Z.); (S.H.); (Y.S.); (X.F.); (X.C.); (K.M.); (Y.P.); (Y.G.); (Y.D.)
| | - Yan Sun
- Soybean Research Institute of Northeast Agricultural University/Key Laboratory of Soybean Biology of Chinese Education Ministry, Harbin 150030, China; (H.G.); (J.M.); (Y.Z.); (C.Z.); (M.Z.); (S.H.); (Y.S.); (X.F.); (X.C.); (K.M.); (Y.P.); (Y.G.); (Y.D.)
| | - Xin Fang
- Soybean Research Institute of Northeast Agricultural University/Key Laboratory of Soybean Biology of Chinese Education Ministry, Harbin 150030, China; (H.G.); (J.M.); (Y.Z.); (C.Z.); (M.Z.); (S.H.); (Y.S.); (X.F.); (X.C.); (K.M.); (Y.P.); (Y.G.); (Y.D.)
| | - Xiaoyu Chen
- Soybean Research Institute of Northeast Agricultural University/Key Laboratory of Soybean Biology of Chinese Education Ministry, Harbin 150030, China; (H.G.); (J.M.); (Y.Z.); (C.Z.); (M.Z.); (S.H.); (Y.S.); (X.F.); (X.C.); (K.M.); (Y.P.); (Y.G.); (Y.D.)
| | - Kexin Ma
- Soybean Research Institute of Northeast Agricultural University/Key Laboratory of Soybean Biology of Chinese Education Ministry, Harbin 150030, China; (H.G.); (J.M.); (Y.Z.); (C.Z.); (M.Z.); (S.H.); (Y.S.); (X.F.); (X.C.); (K.M.); (Y.P.); (Y.G.); (Y.D.)
| | - Yanjie Pang
- Soybean Research Institute of Northeast Agricultural University/Key Laboratory of Soybean Biology of Chinese Education Ministry, Harbin 150030, China; (H.G.); (J.M.); (Y.Z.); (C.Z.); (M.Z.); (S.H.); (Y.S.); (X.F.); (X.C.); (K.M.); (Y.P.); (Y.G.); (Y.D.)
| | - Yachang Gu
- Soybean Research Institute of Northeast Agricultural University/Key Laboratory of Soybean Biology of Chinese Education Ministry, Harbin 150030, China; (H.G.); (J.M.); (Y.Z.); (C.Z.); (M.Z.); (S.H.); (Y.S.); (X.F.); (X.C.); (K.M.); (Y.P.); (Y.G.); (Y.D.)
| | - Yaqun Dongye
- Soybean Research Institute of Northeast Agricultural University/Key Laboratory of Soybean Biology of Chinese Education Ministry, Harbin 150030, China; (H.G.); (J.M.); (Y.Z.); (C.Z.); (M.Z.); (S.H.); (Y.S.); (X.F.); (X.C.); (K.M.); (Y.P.); (Y.G.); (Y.D.)
| | - Junjiang Wu
- Soybean Research Institute of Heilongjiang Academy of Agricultural Sciences/Key Laboratory of Soybean Cultivation of Ministry of Agriculture, Harbin 150030, China;
| | - Pengfei Xu
- Soybean Research Institute of Northeast Agricultural University/Key Laboratory of Soybean Biology of Chinese Education Ministry, Harbin 150030, China; (H.G.); (J.M.); (Y.Z.); (C.Z.); (M.Z.); (S.H.); (Y.S.); (X.F.); (X.C.); (K.M.); (Y.P.); (Y.G.); (Y.D.)
| | - Shuzhen Zhang
- Soybean Research Institute of Northeast Agricultural University/Key Laboratory of Soybean Biology of Chinese Education Ministry, Harbin 150030, China; (H.G.); (J.M.); (Y.Z.); (C.Z.); (M.Z.); (S.H.); (Y.S.); (X.F.); (X.C.); (K.M.); (Y.P.); (Y.G.); (Y.D.)
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4
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Chen C, Zhang Z, Lei YY, Chen WJ, Zhang ZH, Li XM, Dai HY. MdMYB44-like positively regulates salt and drought tolerance via the MdPYL8-MdPP2CA module in apple. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2024; 118:24-41. [PMID: 38102874 DOI: 10.1111/tpj.16584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 11/15/2023] [Accepted: 11/25/2023] [Indexed: 12/17/2023]
Abstract
Abscisic acid (ABA) is involved in salt and drought stress responses, but the underlying molecular mechanism remains unclear. Here, we demonstrated that the overexpression of MdMYB44-like, an R2R3-MYB transcription factor, significantly increases the salt and drought tolerance of transgenic apples and Arabidopsis. MdMYB44-like inhibits the transcription of MdPP2CA, which encodes a type 2C protein phosphatase that acts as a negative regulator in the ABA response, thereby enhancing ABA signaling-mediated salt and drought tolerance. Furthermore, we found that MdMYB44-like and MdPYL8, an ABA receptor, form a protein complex that further enhances the transcriptional inhibition of the MdPP2CA promoter by MdMYB44-like. Significantly, we discovered that MdPP2CA can interfere with the physical association between MdMYB44-like and MdPYL8 in the presence of ABA, partially blocking the inhibitory effect of the MdMYB44-like-MdPYL8 complex on the MdPP2CA promoter. Thus, MdMYB44-like, MdPYL8, and MdPP2CA form a regulatory loop that tightly modulates ABA signaling homeostasis under salt and drought stress. Our data reveal that MdMYB44-like precisely modulates ABA-mediated salt and drought tolerance in apples through the MdPYL8-MdPP2CA module.
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Affiliation(s)
- Cui Chen
- College of Horticulture, Shenyang Agricultural University, 120 Dongling Road, Shenyang, Liaoning, 110866, China
| | - Zhen Zhang
- College of Horticulture, Shenyang Agricultural University, 120 Dongling Road, Shenyang, Liaoning, 110866, China
| | - Ying-Ying Lei
- College of Horticulture, Shenyang Agricultural University, 120 Dongling Road, Shenyang, Liaoning, 110866, China
| | - Wen-Jun Chen
- College of Horticulture, Shenyang Agricultural University, 120 Dongling Road, Shenyang, Liaoning, 110866, China
| | - Zhi-Hong Zhang
- College of Horticulture, Shenyang Agricultural University, 120 Dongling Road, Shenyang, Liaoning, 110866, China
| | - Xiao-Ming Li
- College of Horticulture, Shenyang Agricultural University, 120 Dongling Road, Shenyang, Liaoning, 110866, China
| | - Hong-Yan Dai
- College of Horticulture, Shenyang Agricultural University, 120 Dongling Road, Shenyang, Liaoning, 110866, China
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5
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Zhang F, Liu Y, Ma J, Su S, Chen L, Cheng Y, Buter S, Zhao X, Yi L, Lu Z. Analyzing the Diversity of MYB Family Response Strategies to Drought Stress in Different Flax Varieties Based on Transcriptome Data. PLANTS (BASEL, SWITZERLAND) 2024; 13:710. [PMID: 38475556 DOI: 10.3390/plants13050710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 02/20/2024] [Accepted: 02/28/2024] [Indexed: 03/14/2024]
Abstract
The MYB transcription factor family has numerous members, and is involved in biological activities, such as ABA signaling, which plays an important role in a plant's resistance to abiotic stresses such as drought. However, the diversity of MYB members that respond to drought stress and their regulatory mechanisms in different flax varieties were unclear. In this study, we obtained 855.69 Gb of clean data from 120 flax root samples from 20 flax (Linum usitatissimum L.) varieties, assembled 92,861 transcripts, and identified 434 MYB family members in each variety. The expression profiles of the MYB transcription factor family from 20 flax varieties under drought stress were analyzed. The results indicated that there are four strategies by which the MYB family responds to drought stress in these 20 flax varieties, each of which has its own specific processes, such as development, reproduction, and localization processes. The four strategies also include common biological processes, such as stimulus responses, metabolic processes, and biological regulation. The WGCNA method was subsequently employed to identify key members of the MYB family involved in response strategies to drought stress. The results demonstrated that a 1R-MYB subfamily gene co-expression network is significantly related to the gibberellin response and cytokinin-activated signaling pathway processes in the 'Strategy 4' for MYB family response to drought, identifying core genes such as Lus.scaffold70.240. Our results showed a diversity of MYB family responses to drought stress within flax varieties, and these results contribute to deciphering the mechanisms of the MYB family regulation of drought resistance. This will promote the more accurate breeding development of flax to adapt to agricultural production under drought conditions.
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Affiliation(s)
- Fan Zhang
- School of Life Science, Inner Mongolia University, Hohhot 010020, China
- Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, Hohhot 010031, China
- Key Laboratory of Black Soil Protection and Utilization, Ministry of Agriculture and Rural Areas, Inner Mongolia Key Laboratory of Degradation Farmland Ecological Remediation and Pollution Control, Inner Mongolia Conservation Tillage Engineering Technology Research Center, Hohhot 010031, China
| | - Ying Liu
- School of Life Science, Inner Mongolia University, Hohhot 010020, China
- Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, Hohhot 010031, China
- Key Laboratory of Black Soil Protection and Utilization, Ministry of Agriculture and Rural Areas, Inner Mongolia Key Laboratory of Degradation Farmland Ecological Remediation and Pollution Control, Inner Mongolia Conservation Tillage Engineering Technology Research Center, Hohhot 010031, China
| | - Jie Ma
- School of Life Science, Inner Mongolia University, Hohhot 010020, China
- Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, Hohhot 010031, China
- Key Laboratory of Black Soil Protection and Utilization, Ministry of Agriculture and Rural Areas, Inner Mongolia Key Laboratory of Degradation Farmland Ecological Remediation and Pollution Control, Inner Mongolia Conservation Tillage Engineering Technology Research Center, Hohhot 010031, China
| | - Shaofeng Su
- Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, Hohhot 010031, China
- Key Laboratory of Black Soil Protection and Utilization, Ministry of Agriculture and Rural Areas, Inner Mongolia Key Laboratory of Degradation Farmland Ecological Remediation and Pollution Control, Inner Mongolia Conservation Tillage Engineering Technology Research Center, Hohhot 010031, China
| | - Liyu Chen
- Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, Hohhot 010031, China
- Key Laboratory of Black Soil Protection and Utilization, Ministry of Agriculture and Rural Areas, Inner Mongolia Key Laboratory of Degradation Farmland Ecological Remediation and Pollution Control, Inner Mongolia Conservation Tillage Engineering Technology Research Center, Hohhot 010031, China
| | - Yuchen Cheng
- Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, Hohhot 010031, China
- Key Laboratory of Black Soil Protection and Utilization, Ministry of Agriculture and Rural Areas, Inner Mongolia Key Laboratory of Degradation Farmland Ecological Remediation and Pollution Control, Inner Mongolia Conservation Tillage Engineering Technology Research Center, Hohhot 010031, China
| | - Siqin Buter
- Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, Hohhot 010031, China
- Key Laboratory of Black Soil Protection and Utilization, Ministry of Agriculture and Rural Areas, Inner Mongolia Key Laboratory of Degradation Farmland Ecological Remediation and Pollution Control, Inner Mongolia Conservation Tillage Engineering Technology Research Center, Hohhot 010031, China
| | - Xiaoqing Zhao
- School of Life Science, Inner Mongolia University, Hohhot 010020, China
- Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, Hohhot 010031, China
- Key Laboratory of Black Soil Protection and Utilization, Ministry of Agriculture and Rural Areas, Inner Mongolia Key Laboratory of Degradation Farmland Ecological Remediation and Pollution Control, Inner Mongolia Conservation Tillage Engineering Technology Research Center, Hohhot 010031, China
| | - Liuxi Yi
- Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, Hohhot 010031, China
- Agricultural College, Inner Mongolia Agricultural University, Hohhot 010019, China
| | - Zhanyuan Lu
- School of Life Science, Inner Mongolia University, Hohhot 010020, China
- Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, Hohhot 010031, China
- Key Laboratory of Black Soil Protection and Utilization, Ministry of Agriculture and Rural Areas, Inner Mongolia Key Laboratory of Degradation Farmland Ecological Remediation and Pollution Control, Inner Mongolia Conservation Tillage Engineering Technology Research Center, Hohhot 010031, China
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6
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Liu W, Chen G, He M, Wu J, Wen W, Gu Q, Guo S, Wang Y, Sun J. ABI5 promotes heat stress-induced chlorophyll degradation by modulating the stability of MYB44 in cucumber. HORTICULTURE RESEARCH 2023; 10:uhad089. [PMID: 37334179 PMCID: PMC10273075 DOI: 10.1093/hr/uhad089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 04/27/2023] [Indexed: 06/20/2023]
Abstract
The yellowing of leaves caused by the decomposition of chlorophyll (Chl) is a characteristic event during senescence, which can be induced by various environmental stresses. However, the molecular mechanisms of high temperature-induced Chl degradation in horticultural plants remain poorly understood. Here, we found that heat stress induced Chl degradation and the expression of ABI5 and MYB44 in cucumber. Silencing of ABI5 compromised heat stress-induced Chl degradation, and the transcription of pheophytinase (PPH) and pheophorbide a oxygenase (PAO), two key genes in Chl catabolic pathway, but silencing of MYB44 exhibited the opposite results. Furthermore, ABI5 interacted with MYB44 in vitro and in vivo. ABI5 positively regulated heat stress-induced Chl degradation through two pathways. ABI5 directly bound to PPH and PAO promoters to promote their expression, leading to accelerating Chl degradation. On the other hand, the interaction between ABI5 and MYB44 reduced the binding of MYB44 to PPH and PAO promoters and led to the ubiquitination-depended protein degradation of MYB44, thereby alleviating the transcription inhibitory effect of MYB44 on PPH and PAO. Taken together, our findings propose a new regulatory network for ABI5 in regulating heat stress-induced Chl degradation.
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Affiliation(s)
- Weikang Liu
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Guangling Chen
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Mingming He
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Jianqiang Wu
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Wenxu Wen
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Qinsheng Gu
- Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
| | - Shirong Guo
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Yu Wang
- Corresponding authors: E-mails: ;
| | - Jin Sun
- Corresponding authors: E-mails: ;
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7
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Zhang S, Gao H, Wang L, Zhang Y, Zhou D, Anwar A, Li J, Wang F, Li C, Zhang Y, Gao J. Comparative Transcriptome and Co-Expression Network Analyses Reveal the Molecular Mechanism of Calcium-Deficiency-Triggered Tipburn in Chinese Cabbage ( Brassica rapa L. ssp. Pekinensis). PLANTS (BASEL, SWITZERLAND) 2022; 11:3555. [PMID: 36559667 PMCID: PMC9785529 DOI: 10.3390/plants11243555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 12/07/2022] [Accepted: 12/14/2022] [Indexed: 06/17/2023]
Abstract
Chinese cabbage tipburn is characterized by the formation of necrotic lesions on the margin of leaves, including on the insides of the leafy head. This physiological disorder is associated with a localized calcium deficiency during leaf development. However, little information is available regarding the molecular mechanisms governing Ca-deficiency-triggered tipburn. This study comprehensively analysed the transcriptomic comparison between control and calcium treatments (CK and 0 mM Ca) in Chinese cabbage to determine its molecular mechanism in tipburn. Our analysis identified that the most enriched gene ontology (GO) categories are photosynthesis, thylakoid and cofactor binding. Moreover, the KEGG pathway was most enriched in photosynthesis, carbon metabolism and carbon fixation. We also analyzed the co-expression network by functional categories and identified ten critical hub differentially expressed genes (DEGs) in each gene regulatory network (GRN). These DEGs might involve abiotic stresses, developmental processes, cell wall metabolism, calcium distribution, transcription factors, plant hormone biosynthesis and signal transduction pathways. Under calcium deficiency, CNX1, calmodulin-binding proteins and CMLs family proteins were downregulated compared to CK. In addition, plant hormones such as GA, JA, BR, Auxin and ABA biosynthesis pathways genes were downregulated under calcium treatment. Likewise, HATs, ARLs and TCP transcription factors were reported as inactive under calcium deficiency, and potentially involved in the developmental process. This work explores the specific DEGs' significantly different expression levels in 0 mM Ca and the control involved in plant hormones, cell wall developments, a light response such as chlorophylls and photosynthesis, transport metabolism and defence mechanism and redox. Our results provide critical evidence of the potential roles of the calcium signal transduction pathway and candidate genes governing Ca-deficiency-triggered tipburn in Chinese cabbage.
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Affiliation(s)
- Shu Zhang
- Institute of Vegetables, Shandong Key Laboratory of Greenhouse Vegetable Biology, Shandong Branch of National Vegetable Improvement Center, Huanghuai Region Vegetable Scientific Station of Ministry of Agriculture (Shandong), Shandong Academy of Agricultural Sciences, Jinan 250100, China
| | - Hanzhong Gao
- Columbian College of Arts & Sciences, Phillips Hall, The George Washington University, 801 22nd St. NW., Washington, DC 20052, USA
| | - Lixia Wang
- Institute of Vegetables, Shandong Key Laboratory of Greenhouse Vegetable Biology, Shandong Branch of National Vegetable Improvement Center, Huanghuai Region Vegetable Scientific Station of Ministry of Agriculture (Shandong), Shandong Academy of Agricultural Sciences, Jinan 250100, China
| | - Yihui Zhang
- Institute of Vegetables, Shandong Key Laboratory of Greenhouse Vegetable Biology, Shandong Branch of National Vegetable Improvement Center, Huanghuai Region Vegetable Scientific Station of Ministry of Agriculture (Shandong), Shandong Academy of Agricultural Sciences, Jinan 250100, China
- College of Life Sciences, Shandong Normal University, Jinan 250061, China
| | - Dandan Zhou
- College of Life Sciences, Shandong Normal University, Jinan 250061, China
| | - Ali Anwar
- Institute of Vegetables, Shandong Key Laboratory of Greenhouse Vegetable Biology, Shandong Branch of National Vegetable Improvement Center, Huanghuai Region Vegetable Scientific Station of Ministry of Agriculture (Shandong), Shandong Academy of Agricultural Sciences, Jinan 250100, China
| | - Jingjuan Li
- Institute of Vegetables, Shandong Key Laboratory of Greenhouse Vegetable Biology, Shandong Branch of National Vegetable Improvement Center, Huanghuai Region Vegetable Scientific Station of Ministry of Agriculture (Shandong), Shandong Academy of Agricultural Sciences, Jinan 250100, China
| | - Fengde Wang
- Institute of Vegetables, Shandong Key Laboratory of Greenhouse Vegetable Biology, Shandong Branch of National Vegetable Improvement Center, Huanghuai Region Vegetable Scientific Station of Ministry of Agriculture (Shandong), Shandong Academy of Agricultural Sciences, Jinan 250100, China
| | - Cheng Li
- Institute of Vegetables, Shandong Key Laboratory of Greenhouse Vegetable Biology, Shandong Branch of National Vegetable Improvement Center, Huanghuai Region Vegetable Scientific Station of Ministry of Agriculture (Shandong), Shandong Academy of Agricultural Sciences, Jinan 250100, China
| | - Ye Zhang
- College of Life Science, Huangshan University, Huangshan 245061, China
| | - Jianwei Gao
- Institute of Vegetables, Shandong Key Laboratory of Greenhouse Vegetable Biology, Shandong Branch of National Vegetable Improvement Center, Huanghuai Region Vegetable Scientific Station of Ministry of Agriculture (Shandong), Shandong Academy of Agricultural Sciences, Jinan 250100, China
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Liu Y, Shen Y, Liang M, Zhang X, Xu J, Shen Y, Chen Z. Identification of Peanut AhMYB44 Transcription Factors and Their Multiple Roles in Drought Stress Responses. PLANTS (BASEL, SWITZERLAND) 2022; 11:3522. [PMID: 36559634 PMCID: PMC9788490 DOI: 10.3390/plants11243522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 12/13/2022] [Accepted: 12/13/2022] [Indexed: 06/17/2023]
Abstract
MYB transcription factors (TFs) comprise a large gene family that plays an important role in plant growth, development, stress responses, and defense regulation. However, their functions in peanut remain to be further elucidated. Here, we identified six AhMYB44 genes (AhMYB44-01/11, AhMYB44-05/15, and AhMYB44-06/16) in cultivated peanut. They are typical R2R3-MYB TFs and have many similarities but different expression patterns in response to drought stress, suggesting different functions under drought stress. Homologous genes with higher expression in each pair were selected for further study. All of them were nuclear proteins and had no self-transactivation activity. In addition, we compared the performances of different lines at germination, seedling, and adult stages under drought stress. After drought treatment, the overexpression of AhMYB44-11 transgenic plants resulted in the longest root length at the seedling stage. Levels of proline, soluble sugar and chlorophyll, and expression levels of stress-related genes, including P5CS1, RD29A, CBF1, and COR15A, were higher than those of the wild type (WT) at the adult stage. While the overexpression of AhMYB44-16 significantly increased the drought sensitivity of plants at all stages, with differential ABA content, the expression levels of the ABA-related genes PP2CA and ABI1 were significantly upregulated and those of ABA1 and ABA2 were significantly downregulated compared with the WT. AhMYB44-05 showed similar downregulated expression as AhMYB44-16 under drought stress, but its overexpression in Arabidopsis did not significantly affect the drought resistance of transgenic plants. Based on the results, we propose that AhMYB44-11 plays a role as a positive factor in drought tolerance by increasing the transcription abundance of stress-related genes and the accumulation of osmolytes, while AhMYB44-16 negatively regulates drought tolerance through its involvement in ABA-dependent stress response pathways.
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Affiliation(s)
| | | | | | | | | | - Yi Shen
- Correspondence: (Y.S.); (Z.C.)
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9
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Chen J, Bi YY, Wang QQ, Liu DK, Zhang D, Ding X, Liu ZJ, Chen SP. Genome-wide identification and analysis of anthocyanin synthesis-related R2R3-MYB genes in Cymbidium goeringii. FRONTIERS IN PLANT SCIENCE 2022; 13:1002043. [PMID: 36247626 PMCID: PMC9554442 DOI: 10.3389/fpls.2022.1002043] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Accepted: 08/29/2022] [Indexed: 06/16/2023]
Abstract
The MYB gene family plays a vital regulatory role in plant metabolism, stress response, and floral color. The R2R3-MYB gene family of C. goeringii was identified, and its expression was analyzed using bioinformatics in this article. The R2R3-MYB genes of Arabidopsis thaliana were used as a reference to determine 104 CgMYB genes and categorize them into 22 subfamilies. Exon/intron organizations and conserved motif analysis revealed that the majority of CgMYB genes were highly conserved, and chromosome localization and collinearity analysis provided evidence of tandem duplication and segmental duplication events, indicating the phenomenon of gene family expansion and contraction. The function of CgMYB genes was analyzed by cis-acting element and gene ontology (GO) enrichment. In addition, we selected CgMYB91 and CgMYB32 for RT-qPCR, suggesting that CgMYB91 and CgMYB32 are associated with anthocyanin formation. In short, this study provides a comprehensive and specific function of the R2R3-MYB transcription factors (TFs) in orchids.
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Affiliation(s)
- Jiating Chen
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yuan-Yang Bi
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Qian-Qian Wang
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Ding-Kun Liu
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Diyang Zhang
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Xiangqing Ding
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Zhong-Jian Liu
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Shi-Pin Chen
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China
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10
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Wang S, Wu H, Cao X, Fan W, Li C, Zhao H, Wu Q. Tartary buckwheat FtMYB30 transcription factor improves the salt/drought tolerance of transgenic Arabidopsis in an ABA-dependent manner. PHYSIOLOGIA PLANTARUM 2022; 174:e13781. [PMID: 36121384 DOI: 10.1111/ppl.13781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 08/23/2022] [Accepted: 09/16/2022] [Indexed: 06/15/2023]
Abstract
Drought and high salinity affect plant growth, development, yield, and quality. MYB transcription factors (TFs) in plants play an indispensable regulatory role in resisting adverse stress. In this study, screening and functional validation of the TF FtMYB30, which can respond extensively to abiotic stress and abscisic acid (ABA), was achieved in Tartary buckwheat. FtMYB30, one of the SG22 (sub-group 22) family of R2R3-MYB TFs, localized in the nucleus and had transcriptional activation activity. Under drought and salt stress, FtMYB30 overexpression reduced the oxidative damage in transgenic plants by increasing the activity of proline content and antioxidant enzymes and significantly upregulate the expression of RD29A, RD29B, and Cu/ZnSOD, thereby enhancing drought/salt tolerance in transgenic Arabidopsis. Additionally, overexpression of FtMYB30 can reduce the sensitivity of transgenic plants to ABA. Moreover, AtRCAR1/2/3 and AtMPK6 directly interact with the FtMYB30 TF, possibly through the crosstalk between MAPKs (mitogen-activated protein kinases) and the ABA signaling pathway. Taken together, these results suggest that FtMYB30, as a positive regulator, mediates plant tolerance to salt and drought through an ABA-dependent signaling pathway.
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Affiliation(s)
- Shuang Wang
- College of Life Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Huala Wu
- College of Life Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Xinxian Cao
- College of Life Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Wenjing Fan
- College of Life Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Chenglei Li
- College of Life Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Haixia Zhao
- College of Life Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Qi Wu
- College of Life Science, Sichuan Agricultural University, Ya'an, Sichuan, China
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Li X, Xie Y, Zhang Q, Hua X, Peng L, Li K, Yu Q, Chen Y, Yao H, He J, Huang Y, Wang R, Wang T, Wang J, Li X, Yang Y. Monomerization of abscisic acid receptors through CARKs-mediated phosphorylation. THE NEW PHYTOLOGIST 2022; 235:533-549. [PMID: 35388459 DOI: 10.1111/nph.18149] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 03/25/2022] [Indexed: 06/14/2023]
Abstract
Cytosolic ABA Receptor Kinases (CARKs) play a pivotal role in abscisic acid (ABA)-dependent pathway in response to dehydration, but their regulatory mechanism in ABA signaling remains unexplored. In this study, we showed that CARK4/5 of CARK family physically interacted with ABA receptors (RCARs/PYR1/PYLs), including RCAR3, RCAR11-RCAR14, while CARK2/7/11 only interacted with RCAR11-RCAR14, but not RCAR3. It indicates that the members in CARK family function redundantly and differentially in ABA signaling. RCAR12 can form heterodimer with RCAR3 in vitro and in vivo. Moreover, the members of CARK family can form homodimer or heterodimer in a kinase activity dependent manner. ITC (isothermal titration calorimetry) analysis demonstrated that the phosphorylation of RCAR12 by CARK1 enhanced the ABA binding affinity. The phosphor-mimic RCAR12T105D significantly displayed ABA-induced inhibition of the phosphatase ABI1 (ABA insensitive 1) activity, leading to upregulation of ABA-responsive genes RD29A and RD29B in cark157:RCAR12T105D transgenic plants, which exhibited ABA hypersensitive phenotype. The transcription factor ABI5 (ABA insensitive 5) activates the transcriptions of CARK1 and CARK3 by binding to ABA-response elements (ABREs) of their promoters. Collectively, our data imply that the dimeric CARKs phosphorylate homodimer or heterodimer ABA receptors, leading to monomerization for triggering ABA responses in Arabidopsis.
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Affiliation(s)
- Xiaoyi Li
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Yiting Xie
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Qian Zhang
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Xinyue Hua
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Lu Peng
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Kexuan Li
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Qin Yu
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Yihong Chen
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Huan Yao
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Juan He
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Yaling Huang
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Ruolin Wang
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Tao Wang
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Jianmei Wang
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Xufeng Li
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Yi Yang
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
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Qin B, Fan SL, Yu HY, Lu YX, Wang LF. HbMYB44, a Rubber Tree MYB Transcription Factor With Versatile Functions in Modulating Multiple Phytohormone Signaling and Abiotic Stress Responses. FRONTIERS IN PLANT SCIENCE 2022; 13:893896. [PMID: 35720610 PMCID: PMC9201644 DOI: 10.3389/fpls.2022.893896] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Accepted: 05/09/2022] [Indexed: 06/15/2023]
Abstract
The vital roles of R2R3-MYB transcription factors (TFs) in regulating stress response and phytohormone signaling have been thoroughly studied in numerous plant species, but the functions of these TFs in rubber tree are poorly understood. Rubber tree is the most important source of natural rubber but often suffers from various abiotic and biotic stresses that cause severe yield losses each year. In this study, we reported a novel MYB44 gene in rubber tree (named HbMYB44) and revealed its biological function. HbMYB44 was highly similar to AtMYB44 and clustered into subgroup 22. Transient expression indicated that HbMYB44 is a nuclear localized protein and displays transactivation activity at the C-terminus. HbMYB44 was ubiquitously expressed in rubber tree, and its expression was strongly induced by multiple phytohormones, drought stress, wounding, and H2O2 treatments. Furthermore, overexpression of HbMYB44 in Arabidopsis (OE) demonstrated that OE plants significantly enhanced stress tolerance, i.e., salt stress, osmotic stress, and drought stress. Additionally, HbMYB44 promoted recovery from root growth inhibition of OE plants caused by exogenous phytohormones (including abscisic acid, methyl jasmonic acid, gibberellic acid 3, and salicylic acid), but the opposite effect was present in response to ethephon. Interestingly, HbMYB44 increased the expression of its homologous genes and interacting protein-encoding genes in OE plants. Overall, HbMYB44 plays versatile functions in modulating multiple phytohormone signaling pathways and stress tolerance.
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Affiliation(s)
- Bi Qin
- Key Laboratory of Biology and Genetic Resources of Rubber Tree, Ministry of Agriculture and Rural Affairs, Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, China
| | - Song-Le Fan
- Institute of Tropical Crops, Hainan University, Haikou, China
| | - Hai-Yang Yu
- Institute of Tropical Crops, Hainan University, Haikou, China
| | - Yan-Xi Lu
- Key Laboratory of Biology and Genetic Resources of Rubber Tree, Ministry of Agriculture and Rural Affairs, Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, China
| | - Li-Feng Wang
- Institute of Tropical Crops, Hainan University, Haikou, China
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Plant Dehydrins: Expression, Regulatory Networks, and Protective Roles in Plants Challenged by Abiotic Stress. Int J Mol Sci 2021; 22:ijms222312619. [PMID: 34884426 PMCID: PMC8657568 DOI: 10.3390/ijms222312619] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 11/18/2021] [Accepted: 11/20/2021] [Indexed: 11/16/2022] Open
Abstract
Dehydrins, also known as Group II late embryogenesis abundant (LEA) proteins, are classic intrinsically disordered proteins, which have high hydrophilicity. A wide range of hostile environmental conditions including low temperature, drought, and high salinity stimulate dehydrin expression. Numerous studies have furnished evidence for the protective role played by dehydrins in plants exposed to abiotic stress. Furthermore, dehydrins play important roles in seed maturation and plant stress tolerance. Hence, dehydrins might also protect plasma membranes and proteins and stabilize DNA conformations. In the present review, we discuss the regulatory networks of dehydrin gene expression including the abscisic acid (ABA), mitogen-activated protein (MAP) kinase cascade, and Ca2+ signaling pathways. Crosstalk among these molecules and pathways may form a complex, diverse regulatory network, which may be implicated in regulating the same dehydrin.
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Emerging roles of NAC transcription factor in medicinal plants: progress and prospects. 3 Biotech 2021; 11:425. [PMID: 34567930 DOI: 10.1007/s13205-021-02970-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Accepted: 08/19/2021] [Indexed: 10/20/2022] Open
Abstract
Transcriptional factors act as mediators in regulating stress response in plants from signal perception to processing the directed gene expression. WRKY, MYB, AP2/ERF, etc. are some of the major families of transcription factors known to mediate stress mechanisms in plants by regulating the production of secondary metabolites. NAC domain-containing proteins are among these large transcription factors families in plants. These proteins play impulsive roles in plant growth, development, and various abiotic as well as biotic stresses. They are involved in regulating the different signaling pathways of plant hormones that direct a plant's immunity against pathogens, thereby affecting their immune responses. However, their role in stress regulation or defence mechanism in plants through the secondary metabolite biosynthesis pathway is studied for very few cases. Emerging concern over the requirement of medicinal plants for the production of biocompatible drugs and antibiotics, the study of these vast, affecting proteins should be focused to improve their qualitative and quantitative production further. In medicinal plants, phytochemicals and secondary metabolites are the major biochemicals that impose antimicrobial and other medicinal properties in these plants. This review compiles the NAC transcription factors reported in selected medicinal plants and their possible roles in different mechanisms. Further, the comprehensive understanding of the molecular mechanism, genetic engineering, and regulation responses of NAC TFs in medicinal plants, can lead to improvement in stress response, immunity, and production of usable secondary metabolites.
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15
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Wang X, Niu Y, Zheng Y. Multiple Functions of MYB Transcription Factors in Abiotic Stress Responses. Int J Mol Sci 2021; 22:ijms22116125. [PMID: 34200125 PMCID: PMC8201141 DOI: 10.3390/ijms22116125] [Citation(s) in RCA: 137] [Impact Index Per Article: 45.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 05/20/2021] [Accepted: 05/25/2021] [Indexed: 01/25/2023] Open
Abstract
Plants face a more volatile environment than other organisms because of their immobility, and they have developed highly efficient mechanisms to adapt to stress conditions. Transcription factors, as an important part of the adaptation process, are activated by different signals and are responsible for the expression of stress-responsive genes. MYB transcription factors, as one of the most widespread transcription factor families in plants, participate in plant development and responses to stresses by combining with MYB cis-elements in promoters of target genes. MYB transcription factors have been extensively studied and have proven to be critical in the biosynthesis of secondary metabolites in plants, including anthocyanins, flavonols, and lignin. Multiple studies have now shown that MYB proteins play diverse roles in the responses to abiotic stresses, such as drought, salt, and cold stresses. However, the regulatory mechanism of MYB proteins in abiotic stresses is still not well understood. In this review, we will focus mainly on the function of Arabidopsis MYB transcription factors in abiotic stresses, especially how MYB proteins participate in these stress responses. We also pay attention to how the MYB proteins are regulated in these processes at both the transcript and protein levels.
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Wang P, Sun X, Zhang K, Fang Y, Wang J, Yang C, Li WX, Ning H. Mapping QTL/QTN and mining candidate genes for plant height and its response to planting densities in soybean [ Glycine max (L.) Merr.] through a FW-RIL population. MOLECULAR BREEDING : NEW STRATEGIES IN PLANT IMPROVEMENT 2021; 41:12. [PMID: 37309477 PMCID: PMC10236039 DOI: 10.1007/s11032-021-01209-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 01/26/2021] [Indexed: 06/13/2023]
Abstract
Plant height (PH) determines the morphology and seed yield of soybean, so it is an important breeding target, which is controlled by multiple genes and affected by plant density. In this research, it was used about a four-way recombinant inbred lines (FW-RIL) with 144 families constructed by double cross (Kenfeng 14 × Kenfeng 15) × (Heinong 48 × Kenfeng 19) as experimental materials, with the purpose to map QTL/QTN associated with PH under densities of 2.2×105 plant/ha (D1) and 3×105 plant/ha (D2) in five environments. The results showed that response of PH to densities varied in accordance to genotypes among environments. A total of 26 QTLs and 13 QTNs were identified specifically in D1; 20 QTLs and 21 QTNs were identified specifically in D2. Nine QTLs and one QTN were discovered commonly in two densities. Fifteen QTLs and 9 QTNs were repeatedly detected by multiple statistical methods, densities, or environments, which could be considered stable. Eighteen QTLs were detected, as well as 7 QTNs underlying responses of PH to density increment. Six QTNs, co-located in the interval of QTL, were detected in more than two environments or methods with a longer genome length over 3000 kb. Based on gene ontology (GO) enrichment analysis and Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis, five genes were predicted as candidates, which were likely to be involved in growth and development of PH. The results will help elucidate the genetic basis and improve molecular assistant selection of PH. Supplementary Information The online version contains supplementary material available at 10.1007/s11032-021-01209-0.
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Affiliation(s)
- Ping Wang
- Key Laboratory of Soybean Biology, Ministry of Education/Key Laboratory of Soybean Biology and Breeding/Genetics, Ministry of Agriculture, Northeast Agricultural University, Harbin, China
- Huaiyin Institute of Technology, Huai’an, China
| | - Xu Sun
- Key Laboratory of Soybean Biology, Ministry of Education/Key Laboratory of Soybean Biology and Breeding/Genetics, Ministry of Agriculture, Northeast Agricultural University, Harbin, China
| | - Kaixin Zhang
- Key Laboratory of Soybean Biology, Ministry of Education/Key Laboratory of Soybean Biology and Breeding/Genetics, Ministry of Agriculture, Northeast Agricultural University, Harbin, China
| | - Yanlong Fang
- Key Laboratory of Soybean Biology, Ministry of Education/Key Laboratory of Soybean Biology and Breeding/Genetics, Ministry of Agriculture, Northeast Agricultural University, Harbin, China
| | - Jiajing Wang
- Key Laboratory of Soybean Biology, Ministry of Education/Key Laboratory of Soybean Biology and Breeding/Genetics, Ministry of Agriculture, Northeast Agricultural University, Harbin, China
| | - Chang Yang
- Key Laboratory of Soybean Biology, Ministry of Education/Key Laboratory of Soybean Biology and Breeding/Genetics, Ministry of Agriculture, Northeast Agricultural University, Harbin, China
| | - Wen-Xia Li
- Key Laboratory of Soybean Biology, Ministry of Education/Key Laboratory of Soybean Biology and Breeding/Genetics, Ministry of Agriculture, Northeast Agricultural University, Harbin, China
| | - Hailong Ning
- Key Laboratory of Soybean Biology, Ministry of Education/Key Laboratory of Soybean Biology and Breeding/Genetics, Ministry of Agriculture, Northeast Agricultural University, Harbin, China
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Jung C, Nguyen NH, Cheong JJ. Transcriptional Regulation of Protein Phosphatase 2C Genes to Modulate Abscisic Acid Signaling. Int J Mol Sci 2020; 21:ijms21249517. [PMID: 33327661 PMCID: PMC7765119 DOI: 10.3390/ijms21249517] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 12/04/2020] [Accepted: 12/12/2020] [Indexed: 01/04/2023] Open
Abstract
The plant hormone abscisic acid (ABA) triggers cellular tolerance responses to osmotic stress caused by drought and salinity. ABA controls the turgor pressure of guard cells in the plant epidermis, leading to stomatal closure to minimize water loss. However, stomatal apertures open to uptake CO2 for photosynthesis even under stress conditions. ABA modulates its signaling pathway via negative feedback regulation to maintain plant homeostasis. In the nuclei of guard cells, the clade A type 2C protein phosphatases (PP2Cs) counteract SnRK2 kinases by physical interaction, and thereby inhibit activation of the transcription factors that mediate ABA-responsive gene expression. Under osmotic stress conditions, PP2Cs bind to soluble ABA receptors to capture ABA and release active SnRK2s. Thus, PP2Cs function as a switch at the center of the ABA signaling network. ABA induces the expression of genes encoding repressors or activators of PP2C gene transcription. These regulators mediate the conversion of PP2C chromatins from a repressive to an active state for gene transcription. The stress-induced chromatin remodeling states of ABA-responsive genes could be memorized and transmitted to plant progeny; i.e., transgenerational epigenetic inheritance. This review focuses on the mechanism by which PP2C gene transcription modulates ABA signaling.
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Affiliation(s)
- Choonkyun Jung
- Department of International Agricultural Technology and Crop Biotechnology, Institute/Green Bio Science and Technology, Seoul National University, Pyeongchang 25354, Korea;
- Department of Plant Science, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
| | - Nguyen Hoai Nguyen
- Faculty of Biotechnology, Ho Chi Minh City Open University, Ho Chi Minh City 700000, Vietnam;
| | - Jong-Joo Cheong
- Center for Food and Bioconvergence, Seoul National University, Seoul 08826, Korea
- Correspondence: ; Tel.: +82-2-880-4888; Fax: +82-2-873-5260
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18
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AcoMYB4, an Ananas comosus L. MYB Transcription Factor, Functions in Osmotic Stress through Negative Regulation of ABA Signaling. Int J Mol Sci 2020; 21:ijms21165727. [PMID: 32785037 PMCID: PMC7460842 DOI: 10.3390/ijms21165727] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 08/03/2020] [Accepted: 08/07/2020] [Indexed: 11/17/2022] Open
Abstract
Drought and salt stress are the main environmental cues affecting the survival, development, distribution, and yield of crops worldwide. MYB transcription factors play a crucial role in plants’ biological processes, but the function of pineapple MYB genes is still obscure. In this study, one of the pineapple MYB transcription factors, AcoMYB4, was isolated and characterized. The results showed that AcoMYB4 is localized in the cell nucleus, and its expression is induced by low temperature, drought, salt stress, and hormonal stimulation, especially by abscisic acid (ABA). Overexpression of AcoMYB4 in rice and Arabidopsis enhanced plant sensitivity to osmotic stress; it led to an increase in the number stomata on leaf surfaces and lower germination rate under salt and drought stress. Furthermore, in AcoMYB4 OE lines, the membrane oxidation index, free proline, and soluble sugar contents were decreased. In contrast, electrolyte leakage and malondialdehyde (MDA) content increased significantly due to membrane injury, indicating higher sensitivity to drought and salinity stresses. Besides the above, both the expression level and activities of several antioxidant enzymes were decreased, indicating lower antioxidant activity in AcoMYB4 transgenic plants. Moreover, under osmotic stress, overexpression of AcoMYB4 inhibited ABA biosynthesis through a decrease in the transcription of genes responsible for ABA synthesis (ABA1 and ABA2) and ABA signal transduction factor ABI5. These results suggest that AcoMYB4 negatively regulates osmotic stress by attenuating cellular ABA biosynthesis and signal transduction pathways.
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Zhang H, Ma F, Wang X, Liu S, Saeed UH, Hou X, Zhang Y, Luo D, Meng Y, Zhang W, Abid K, Chen R. Molecular and Functional Characterization of CaNAC035, an NAC Transcription Factor From Pepper ( Capsicum annuum L.). FRONTIERS IN PLANT SCIENCE 2020; 11:14. [PMID: 32117364 PMCID: PMC7011960 DOI: 10.3389/fpls.2020.00014] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Accepted: 01/08/2020] [Indexed: 05/16/2023]
Abstract
NAC (NAM, ATAF1/2, and CUC2) proteins are the plant-specific transcription factors (TFs) which are important in plant response to abiotic stresses. However, knowledge about the functional role that NACs play in pepper abiotic stress tolerance is limited. In this study, we isolated a NAC TF gene, CaNAC035, from pepper (Capsicum annuum L.), where the protein is localized in the nucleus and functions as a transcriptional activator. CaNAC035 expression is induced by low and high temperatures, osmotic stress, salt, gibberellic acid (GA), methyl-jasmonic acid (MeJA), salicylic acid (SA), and abscisic acid (ABA). To understand the function of CaNAC035 in the abiotic stress responsep, we used virus-induced gene silencing in pepper to knockdown the CaNAC035 and overexpressed the CaNAC035 in Arabidopsis. The results showed that pepper seedlings in which CaNAC035 was silenced, showed more damage than the control pepper plants after cold, NaCl, and mannitol treatments. Correspondingly increased electrolyte leakage, a higher level of malondialdehyde (MDA), H2O2, and superoxide radicals were found after cold treatments. CaNAC035-silenced seedlings exhibited lower chlorophyll content while CaNAC035-overexpressed Arabidopsis plants had higher germination rate and fresh weight after mannitol and NaCl treatments. We also reported 18 proteins that potentially interact with CaNAC035 and may participate in processes such as the stress response, resistance, and photosynthesis. Our results suggest that CaNAC035 is a positive regulator of abiotic stress tolerance in pepper which acts through multiple signaling pathways.
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20
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Alexander RD, Wendelboe-Nelson C, Morris PC. The barley transcription factor HvMYB1 is a positive regulator of drought tolerance. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2019; 142:246-253. [PMID: 31374377 DOI: 10.1016/j.plaphy.2019.07.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 07/09/2019] [Accepted: 07/10/2019] [Indexed: 05/07/2023]
Abstract
Transcription factors such as MYB have previously been associated with the plant response to drought. In this work, studies on the function of the barley (Hordeum vulgare L.) transcription factor HvMYB1 show that gene expression is upregulated in wildtype barley roots and leaves under drought and osmotic stress. Transgenic barley plants that overexpress HvMYB1 were found to be more resistant to drought, showing enhanced relative water content and reduced water loss rate and stomatal conductance as compared to control plants. Levels of the osmolyte proline were enhanced as was expression of dehydrin HvDNH6 in the transgenic lines under drought conditions. The levels of the reactive oxygen species H2O2 were enhanced in wildtype roots and leaves by drought, but less so in the HvMYB1 overexpressing lines. Enzyme activity of the low affinity H2O2 degrading enzyme catalase (EC 1.11.1.6) was also lower in droughted HvMYB1 overexpressing lines. Gene expression of the high affinity ROS scavengers ASCORBATE PEROXIDASE and GLUTATHIONE PEROXIDASE was found to be constitutively high in the overexpressing lines, whereas CATALASE gene expression was similar to the control plants. These results suggest a role for HvMYB1 in protecting plants against drought in the vegetative plant by acting as a mediator of abscisic acid action.
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Affiliation(s)
- Ross D Alexander
- Institute for Life and Earth Sciences, School of Energy, Geosciences, Infrastructure and Society, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, UK.
| | - Charlotte Wendelboe-Nelson
- Institute for Life and Earth Sciences, School of Energy, Geosciences, Infrastructure and Society, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, UK.
| | - Peter C Morris
- Institute for Life and Earth Sciences, School of Energy, Geosciences, Infrastructure and Society, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, UK.
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21
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Costa-Broseta Á, Perea-Resa C, Castillo MC, Ruíz MF, Salinas J, León J. Nitric oxide deficiency decreases C-repeat binding factor-dependent and -independent induction of cold acclimation. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:3283-3296. [PMID: 30869795 PMCID: PMC6598078 DOI: 10.1093/jxb/erz115] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Accepted: 02/28/2019] [Indexed: 05/28/2023]
Abstract
Plant tolerance to freezing temperatures is governed by endogenous components and environmental factors. Exposure to low non-freezing temperatures is a key factor in the induction of freezing tolerance in the process called cold acclimation. The role of nitric oxide (NO) in cold acclimation was explored in Arabidopsis using triple nia1nia2noa1-2 mutants that are impaired in the nitrate-dependent and nitrate-independent pathways of NO production, and are thus NO deficient. Here, we demonstrate that cold-induced NO accumulation is required to promote the full cold acclimation response through C-repeat Binding Factor (CBF)-dependent gene expression, as well as the CBF-independent expression of other cold-responsive genes such as Oxidation-Related Zinc Finger 2 (ZF/OZF2). NO deficiency also altered abscisic acid perception and signaling and the cold-induced production of anthocyanins, which are additional factors involved in cold acclimation.
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Affiliation(s)
- Álvaro Costa-Broseta
- Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas–Universidad Politécnica de Valencia), Valencia, Spain
| | - Carlos Perea-Resa
- Departamento de Biología Medioambiental, Centro de Investigaciones Biológicas, CSIC, Madrid, Spain
| | - Mari-Cruz Castillo
- Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas–Universidad Politécnica de Valencia), Valencia, Spain
| | - M Fernanda Ruíz
- Departamento de Biología Medioambiental, Centro de Investigaciones Biológicas, CSIC, Madrid, Spain
| | - Julio Salinas
- Departamento de Biología Medioambiental, Centro de Investigaciones Biológicas, CSIC, Madrid, Spain
| | - José León
- Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas–Universidad Politécnica de Valencia), Valencia, Spain
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Piao W, Kim SH, Lee BD, An G, Sakuraba Y, Paek NC. Rice transcription factor OsMYB102 delays leaf senescence by down-regulating abscisic acid accumulation and signaling. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:2699-2715. [PMID: 30825376 PMCID: PMC6506775 DOI: 10.1093/jxb/erz095] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 02/18/2019] [Indexed: 05/21/2023]
Abstract
MYB-type transcription factors (TFs) play important roles in plant growth and development, and in the responses to several abiotic stresses. In rice (Oryza sativa), the roles of MYB-related TFs in leaf senescence are not well documented. Here, we examined rice MYB TF gene OsMYB102 and found that an OsMYB102 T-DNA activation-tagged line (termed osmyb102-D), which constitutively expresses OsMYB102 under the control of four tandem repeats of the 35S promoter, and OsMYB102-overexpressing transgenic lines (35S:OsMYB102 and 35S:GFP-OsMYB102) maintain green leaves much longer than the wild-type under natural, dark-induced, and abscisic acid (ABA)-induced senescence conditions. Moreover, an osmyb102 knockout mutant showed an accelerated senescence phenotype under dark-induced and ABA-induced leaf senescence conditions. Microarray analysis showed that a variety of senescence-associated genes (SAGs) were down-regulated in the osmyb102-D line. Further studies demonstrated that overexpression of OsMYB102 controls the expression of SAGs, including genes associated with ABA degradation and ABA signaling (OsABF4, OsNAP, and OsCYP707A6), under dark-induced senescence conditions. OsMYB102 inhibits ABA accumulation by directly activating the transcription of OsCYP707A6, which encodes the ABA catabolic enzyme ABSCISIC ACID 8'-HYDROXYLASE. OsMYB102 also indirectly represses ABA-responsive genes, such as OsABF4 and OsNAP. Collectively, these results demonstrate that OsMYB102 plays a critical role in leaf senescence by down-regulating ABA accumulation and ABA signaling responses.
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Affiliation(s)
- Weilan Piao
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
| | - Suk-Hwan Kim
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
| | - Byoung-Doo Lee
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
| | - Gynheung An
- Department of Plant Molecular Systems Biotechnology, Crop Biotech Institute, Kyung Hee University, Yongin, Republic of Korea
| | - Yasuhito Sakuraba
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
- Present address: Graduate School of Agricultural and Life Sciences, Biotechnology Research Center, The University of Tokyo, Tokyo 113–8657, Japan
| | - Nam-Chon Paek
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
- Correspondence: or
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BplMYB46 from Betula platyphylla Can Form Homodimers and Heterodimers and Is Involved in Salt and Osmotic Stresses. Int J Mol Sci 2019; 20:ijms20051171. [PMID: 30866467 PMCID: PMC6429157 DOI: 10.3390/ijms20051171] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 02/26/2019] [Accepted: 03/04/2019] [Indexed: 12/21/2022] Open
Abstract
MYB proteins play important roles in the regulation of plant growth, development, and stress responses. Overexpression of BplMYB46 from Betula platyphylla improved plant salt and osmotic tolerances. In the present study, the interaction of eight avian myeloblastosis viral oncogene homolog (MYB) transcription factors with BplMYB46 was investigated using the yeast two-hybrid system, which showed that BplMYB46 could form homodimers and heterodimers with BplMYB6, BplMYB8, BplMYB11, BplMYB12, and BplMYB13. Relative beta-glucuronidase activity and chromatin immunoprecipitation assays showed that the interaction between BplMYB46 and the five MYBs increased the binding of BplMYB46 to the MYBCORE motif. A subcellular localization study showed that these MYBs were all located in the nucleus. Real-time fluorescence quantitative PCR results indicated that the expressions of BplMYB46 and the five MYB genes could be induced by salt and osmotic stress, and the BplMYB46 and BplMYB13 exhibited the most similar expression patterns. BplMYB46 and BplMYB13 co-overexpression in tobacco using transient transformation technology improved tobacco’s tolerance to salt and osmotic stresses compared with overexpressing BplMYB13 or BplMYB46 alone. Taken together, these results demonstrated that BplMYB46 could interact with five other MYBs to form heterodimers that activate the transcription of target genes via an enhanced binding ability to the MYBCORE motif to mediate reactive oxygen species scavenging in response to salt and osmotic stresses.
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24
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AtMYB44 interacts with TOPLESS-RELATED corepressors to suppress protein phosphatase 2C gene transcription. Biochem Biophys Res Commun 2018; 507:437-442. [PMID: 30448055 DOI: 10.1016/j.bbrc.2018.11.057] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Accepted: 11/10/2018] [Indexed: 11/21/2022]
Abstract
AtMYB44 has been described in diverse hormonal signaling processes including abscisic acid (ABA)-mediated tolerance to abiotic stress; however, its function as a transcription factor is controversial. AtMYB44 contains the amino acid sequence LSLSL, a putative ETHYLENE-RESPONSIVE ELEMENT BINDING FACTOR-ASSOCIATED AMPHIPHILIC REPRESSION (EAR) motif. In yeast two-hybrid assay, physical interaction between AtMYB44 and a TOPLESS-RELATED (TPR) corepressor was observed, but abolished by mutation of the EAR motif. We performed bimolecular fluorescence complementation assay to confirm their interaction in planta. Chromatin immunoprecipitation assay revealed binding of AtMYB44 to the promoter regions of clade A protein phosphatase 2C (PP2C) genes (e.g., ABI1, ABI2, and HAI1), implying putative targets. Levels of histone H3 acetylation around the promoter regions were markedly lower in AtMYB44-overexpressing (35S:AtMYB44) plants than in wild-type plants. These results suggest that AtMYB44 forms a complex with TPR corepressors and recruits histone deacetylase(s) to suppress PP2C gene transcription in a signal-independent manner.
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25
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Punzo P, Ruggiero A, Possenti M, Nurcato R, Costa A, Morelli G, Grillo S, Batelli G. The PP2A-interactor TIP41 modulates ABA responses in Arabidopsis thaliana. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2018; 94:991-1009. [PMID: 29602224 DOI: 10.1111/tpj.13913] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 03/09/2018] [Accepted: 03/13/2018] [Indexed: 05/27/2023]
Abstract
Modulation of growth in response to environmental cues is a fundamental aspect of plant adaptation to abiotic stresses. TIP41 (TAP42 INTERACTING PROTEIN OF 41 kDa) is the Arabidopsis thaliana orthologue of proteins isolated in mammals and yeast that participate in the Target-of-Rapamycin (TOR) pathway, which modifies cell growth in response to nutrient status and environmental conditions. Here, we characterized the function of TIP41 in Arabidopsis. Expression analyses showed that TIP41 is constitutively expressed in vascular tissues, and is induced following long-term exposure to NaCl, polyethylene glycol and abscisic acid (ABA), suggesting a role of TIP41 in adaptation to abiotic stress. Visualization of a fusion protein with yellow fluorescent protein indicated that TIP41 is localized in the cytoplasm and the nucleus. Abolished expression of TIP41 results in smaller plants with a lower number of rosette leaves and lateral roots, and an increased sensitivity to treatments with chemical TOR inhibitors, indicating that TOR signalling is affected in these mutants. In addition, tip41 mutants are hypersensitive to ABA at germination and seedling stage, whereas over-expressing plants show higher tolerance. Several TOR- and ABA-responsive genes are differentially expressed in tip41, including iron homeostasis, senescence and ethylene-associated genes. In yeast and mammals, TIP41 provides a link between the TOR pathway and the protein phosphatase 2A (PP2A), which in plants participates in several ABA-mediated mechanisms. Here, we showed an interaction of TIP41 with the catalytic subunit of PP2A. Taken together, these results offer important insights into the function of Arabidopsis TIP41 in the modulation of plant growth and ABA responses.
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Affiliation(s)
- Paola Punzo
- National Research Council of Italy, Institute of Biosciences and Bioresources (CNR-IBBR), Via Università 133, Portici, NA, Italy
| | - Alessandra Ruggiero
- National Research Council of Italy, Institute of Biosciences and Bioresources (CNR-IBBR), Via Università 133, Portici, NA, Italy
| | - Marco Possenti
- Council for Agricultural Research and Economics, Research Centre for Genomics and Bioinformatics (CREA-GB), Via Ardeatina 546, 00178, Rome, Italy
| | - Roberta Nurcato
- National Research Council of Italy, Institute of Biosciences and Bioresources (CNR-IBBR), Via Università 133, Portici, NA, Italy
| | - Antonello Costa
- National Research Council of Italy, Institute of Biosciences and Bioresources (CNR-IBBR), Via Università 133, Portici, NA, Italy
| | - Giorgio Morelli
- Council for Agricultural Research and Economics, Research Centre for Genomics and Bioinformatics (CREA-GB), Via Ardeatina 546, 00178, Rome, Italy
| | - Stefania Grillo
- National Research Council of Italy, Institute of Biosciences and Bioresources (CNR-IBBR), Via Università 133, Portici, NA, Italy
| | - Giorgia Batelli
- National Research Council of Italy, Institute of Biosciences and Bioresources (CNR-IBBR), Via Università 133, Portici, NA, Italy
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26
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Khan SA, Li MZ, Wang SM, Yin HJ. Revisiting the Role of Plant Transcription Factors in the Battle against Abiotic Stress. Int J Mol Sci 2018; 19:ijms19061634. [PMID: 29857524 PMCID: PMC6032162 DOI: 10.3390/ijms19061634] [Citation(s) in RCA: 124] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 05/10/2018] [Accepted: 05/24/2018] [Indexed: 01/01/2023] Open
Abstract
Owing to diverse abiotic stresses and global climate deterioration, the agricultural production worldwide is suffering serious losses. Breeding stress-resilient crops with higher quality and yield against multiple environmental stresses via application of transgenic technologies is currently the most promising approach. Deciphering molecular principles and mining stress-associate genes that govern plant responses against abiotic stresses is one of the prerequisites to develop stress-resistant crop varieties. As molecular switches in controlling stress-responsive genes expression, transcription factors (TFs) play crucial roles in regulating various abiotic stress responses. Hence, functional analysis of TFs and their interaction partners during abiotic stresses is crucial to perceive their role in diverse signaling cascades that many researchers have continued to undertake. Here, we review current developments in understanding TFs, with particular emphasis on their functions in orchestrating plant abiotic stress responses. Further, we discuss novel molecular mechanisms of their action under abiotic stress conditions. This will provide valuable information for understanding regulatory mechanisms to engineer stress-tolerant crops.
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Affiliation(s)
- Sardar-Ali Khan
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730000, China.
| | - Meng-Zhan Li
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730000, China.
| | - Suo-Min Wang
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730000, China.
| | - Hong-Ju Yin
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730000, China.
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27
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Maher KA, Bajic M, Kajala K, Reynoso M, Pauluzzi G, West DA, Zumstein K, Woodhouse M, Bubb K, Dorrity MW, Queitsch C, Bailey-Serres J, Sinha N, Brady SM, Deal RB. Profiling of Accessible Chromatin Regions across Multiple Plant Species and Cell Types Reveals Common Gene Regulatory Principles and New Control Modules. THE PLANT CELL 2018. [PMID: 29229750 DOI: 10.1101/167932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The transcriptional regulatory structure of plant genomes remains poorly defined relative to animals. It is unclear how many cis-regulatory elements exist, where these elements lie relative to promoters, and how these features are conserved across plant species. We employed the assay for transposase-accessible chromatin (ATAC-seq) in four plant species (Arabidopsis thaliana, Medicago truncatula, Solanum lycopersicum, and Oryza sativa) to delineate open chromatin regions and transcription factor (TF) binding sites across each genome. Despite 10-fold variation in intergenic space among species, the majority of open chromatin regions lie within 3 kb upstream of a transcription start site in all species. We find a common set of four TFs that appear to regulate conserved gene sets in the root tips of all four species, suggesting that TF-gene networks are generally conserved. Comparative ATAC-seq profiling of Arabidopsis root hair and non-hair cell types revealed extensive similarity as well as many cell-type-specific differences. Analyzing TF binding sites in differentially accessible regions identified a MYB-driven regulatory module unique to the hair cell, which appears to control both cell fate regulators and abiotic stress responses. Our analyses revealed common regulatory principles among species and shed light on the mechanisms producing cell-type-specific transcriptomes during development.
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Affiliation(s)
- Kelsey A Maher
- Department of Biology, Emory University, Atlanta, Georgia 30322
- Graduate Program in Biochemistry, Cell, and Developmental Biology, Emory University, Atlanta, Georgia 30322
| | - Marko Bajic
- Department of Biology, Emory University, Atlanta, Georgia 30322
- Graduate Program in Genetics and Molecular Biology, Emory University, Atlanta, Georgia 30322
| | - Kaisa Kajala
- Department of Plant Biology and Genome Center, University of California, Davis, California 95616
| | - Mauricio Reynoso
- Center for Plant Cell Biology, Botany and Plant Sciences Department, University of California, Riverside, California 92521
| | - Germain Pauluzzi
- Center for Plant Cell Biology, Botany and Plant Sciences Department, University of California, Riverside, California 92521
| | - Donnelly A West
- Department of Plant Biology, University of California, Davis, California 95616
| | - Kristina Zumstein
- Department of Plant Biology, University of California, Davis, California 95616
| | - Margaret Woodhouse
- Department of Plant Biology, University of California, Davis, California 95616
| | - Kerry Bubb
- University of Washington, School of Medicine, Department of Genome Sciences, Seattle, Washington 98195
| | - Michael W Dorrity
- University of Washington, School of Medicine, Department of Genome Sciences, Seattle, Washington 98195
| | - Christine Queitsch
- University of Washington, School of Medicine, Department of Genome Sciences, Seattle, Washington 98195
| | - Julia Bailey-Serres
- Center for Plant Cell Biology, Botany and Plant Sciences Department, University of California, Riverside, California 92521
| | - Neelima Sinha
- Department of Plant Biology, University of California, Davis, California 95616
| | - Siobhan M Brady
- Department of Plant Biology and Genome Center, University of California, Davis, California 95616
| | - Roger B Deal
- Department of Biology, Emory University, Atlanta, Georgia 30322
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28
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Maher KA, Bajic M, Kajala K, Reynoso M, Pauluzzi G, West DA, Zumstein K, Woodhouse M, Bubb K, Dorrity MW, Queitsch C, Bailey-Serres J, Sinha N, Brady SM, Deal RB. Profiling of Accessible Chromatin Regions across Multiple Plant Species and Cell Types Reveals Common Gene Regulatory Principles and New Control Modules. THE PLANT CELL 2018; 30:15-36. [PMID: 29229750 PMCID: PMC5810565 DOI: 10.1105/tpc.17.00581] [Citation(s) in RCA: 168] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 10/30/2017] [Accepted: 12/06/2017] [Indexed: 05/19/2023]
Abstract
The transcriptional regulatory structure of plant genomes remains poorly defined relative to animals. It is unclear how many cis-regulatory elements exist, where these elements lie relative to promoters, and how these features are conserved across plant species. We employed the assay for transposase-accessible chromatin (ATAC-seq) in four plant species (Arabidopsis thaliana, Medicago truncatula, Solanum lycopersicum, and Oryza sativa) to delineate open chromatin regions and transcription factor (TF) binding sites across each genome. Despite 10-fold variation in intergenic space among species, the majority of open chromatin regions lie within 3 kb upstream of a transcription start site in all species. We find a common set of four TFs that appear to regulate conserved gene sets in the root tips of all four species, suggesting that TF-gene networks are generally conserved. Comparative ATAC-seq profiling of Arabidopsis root hair and non-hair cell types revealed extensive similarity as well as many cell-type-specific differences. Analyzing TF binding sites in differentially accessible regions identified a MYB-driven regulatory module unique to the hair cell, which appears to control both cell fate regulators and abiotic stress responses. Our analyses revealed common regulatory principles among species and shed light on the mechanisms producing cell-type-specific transcriptomes during development.
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Affiliation(s)
- Kelsey A Maher
- Department of Biology, Emory University, Atlanta, Georgia 30322
- Graduate Program in Biochemistry, Cell, and Developmental Biology, Emory University, Atlanta, Georgia 30322
| | - Marko Bajic
- Department of Biology, Emory University, Atlanta, Georgia 30322
- Graduate Program in Genetics and Molecular Biology, Emory University, Atlanta, Georgia 30322
| | - Kaisa Kajala
- Department of Plant Biology and Genome Center, University of California, Davis, California 95616
| | - Mauricio Reynoso
- Center for Plant Cell Biology, Botany and Plant Sciences Department, University of California, Riverside, California 92521
| | - Germain Pauluzzi
- Center for Plant Cell Biology, Botany and Plant Sciences Department, University of California, Riverside, California 92521
| | - Donnelly A West
- Department of Plant Biology, University of California, Davis, California 95616
| | - Kristina Zumstein
- Department of Plant Biology, University of California, Davis, California 95616
| | - Margaret Woodhouse
- Department of Plant Biology, University of California, Davis, California 95616
| | - Kerry Bubb
- University of Washington, School of Medicine, Department of Genome Sciences, Seattle, Washington 98195
| | - Michael W Dorrity
- University of Washington, School of Medicine, Department of Genome Sciences, Seattle, Washington 98195
| | - Christine Queitsch
- University of Washington, School of Medicine, Department of Genome Sciences, Seattle, Washington 98195
| | - Julia Bailey-Serres
- Center for Plant Cell Biology, Botany and Plant Sciences Department, University of California, Riverside, California 92521
| | - Neelima Sinha
- Department of Plant Biology, University of California, Davis, California 95616
| | - Siobhan M Brady
- Department of Plant Biology and Genome Center, University of California, Davis, California 95616
| | - Roger B Deal
- Department of Biology, Emory University, Atlanta, Georgia 30322
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29
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Kim YY, Cui MH, Noh MS, Jung KW, Shin JS. The FBA motif-containing protein AFBA1 acts as a novel positive regulator of ABA response in Arabidopsis. PLANT & CELL PHYSIOLOGY 2017; 58:574-586. [PMID: 28184867 DOI: 10.1093/pcp/pcx003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Accepted: 01/04/2017] [Indexed: 06/06/2023]
Abstract
ABA plays a critical role in regulating seed germination and stomatal movement in response to drought stress. Screening ABA-responsive genes led to the identification of a novel Arabidopsis gene encoding a protein which contained a conserved F-box-associated (FBA) domain, subsequently named ABA-responsive FBA domain-containing protein 1 (AFBA1). Expression of ProAFBA1:GUS revealed that this gene was mainly expressed in guard cells. Expression of AFBA1 increased following the application of exogenous ABA and exposure to salt (NaCl) and drought stresses. Seed germination of the loss-of-function mutant (afba1) was insensitive to ABA, salt or mannitol, whereas AFBA1-overexpressing (Ox) seeds were more sensitive to these stresses than the wild-type seeds. The afba1 plants showed decreased drought tolerance, increased water loss rate and ABA-insensitive stomatal movement compared with the wild-type. In contrast, AFBA1-Ox plants exhibited enhanced drought tolerance and a rapid ABA-induced stomatal closure response. The expression of genes encoding serine/threonine protein phosphatases that are known negative regulators of ABA signaling increased in afba1 plants but decreased in AFBA1-Ox plants. AFBA1 was also found to be localized in the nucleus and to interact with an R2R3-type transcription factor, MYB44, leading to the suggestion that it functions in the stabilization of MYB44. Based on these results, we suggest that AFBA1 functions as a novel positive regulator of ABA responses, regulating the expression of genes involved in ABA signal transduction in Arabidopsis through its interaction with positive regulators of ABA signaling including MYB44, and increasing their stability during ABA-mediated responses.
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Affiliation(s)
- Yun Young Kim
- Division of Life Sciences, Korea University, Seoul 136-701, Korea
| | - Mei Hua Cui
- Division of Life Sciences, Korea University, Seoul 136-701, Korea
- School of Life Sciences and Biotechnology, Shanghai JiaoTong University, Shanghai 200240, China
| | - Min Soo Noh
- Division of Life Sciences, Korea University, Seoul 136-701, Korea
| | - Kwang Wook Jung
- Division of Life Sciences, Korea University, Seoul 136-701, Korea
- DuPont Pioneer Hi-Bred, DuPont (Korea) Inc., Gangnam-gu, Seoul 135-719, Korea
| | - Jeong Sheop Shin
- Division of Life Sciences, Korea University, Seoul 136-701, Korea
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Papazian S, Khaling E, Bonnet C, Lassueur S, Reymond P, Moritz T, Blande JD, Albrectsen BR. Central Metabolic Responses to Ozone and Herbivory Affect Photosynthesis and Stomatal Closure. PLANT PHYSIOLOGY 2016; 172:2057-2078. [PMID: 27758847 PMCID: PMC5100778 DOI: 10.1104/pp.16.01318] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Accepted: 10/03/2016] [Indexed: 05/04/2023]
Abstract
Plants have evolved adaptive mechanisms that allow them to tolerate a continuous range of abiotic and biotic stressors. Tropospheric ozone (O3), a global anthropogenic pollutant, directly affects living organisms and ecosystems, including plant-herbivore interactions. In this study, we investigate the stress responses of Brassica nigra (wild black mustard) exposed consecutively to O3 and the specialist herbivore Pieris brassicae Transcriptomics and metabolomics data were evaluated using multivariate, correlation, and network analyses for the O3 and herbivory responses. O3 stress symptoms resembled those of senescence and phosphate starvation, while a sequential shift from O3 to herbivory induced characteristic plant defense responses, including a decrease in central metabolism, induction of the jasmonic acid/ethylene pathways, and emission of volatiles. Omics network and pathway analyses predicted a link between glycerol and central energy metabolism that influences the osmotic stress response and stomatal closure. Further physiological measurements confirmed that while O3 stress inhibited photosynthesis and carbon assimilation, sequential herbivory counteracted the initial responses induced by O3, resulting in a phenotype similar to that observed after herbivory alone. This study clarifies the consequences of multiple stress interactions on a plant metabolic system and also illustrates how omics data can be integrated to generate new hypotheses in ecology and plant physiology.
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Affiliation(s)
- Stefano Papazian
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.)
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
| | - Eliezer Khaling
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.)
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
| | - Christelle Bonnet
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.)
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
| | - Steve Lassueur
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.)
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
| | - Philippe Reymond
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.)
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
| | - Thomas Moritz
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.)
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
| | - James D Blande
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.);
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
| | - Benedicte R Albrectsen
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.);
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
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Zhao Q, Li M, Jia Z, Liu F, Ma H, Huang Y, Song S. AtMYB44 Positively Regulates the Enhanced Elongation of Primary Roots Induced by N-3-Oxo-Hexanoyl-Homoserine Lactone in Arabidopsis thaliana. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2016; 29:774-785. [PMID: 27604593 DOI: 10.1094/mpmi-03-16-0063-r] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
N-acyl-homoserine lactones (AHL) are the quorum-sensing (QS) signal molecules used by many gram-negative bacteria to coordinate their collective behavior in a population. Recent evidence demonstrates their roles in plant root growth and defense responses. AtMYB44 is a multifaceted transcriptional factor that functions in many physiological processes in plants but whether AtMYB44 modulates the plant response to AHL with aspects of primary root elongation remains unknown. Here, we show that the expression of AtMYB44 was upregulated upon treatment with N-3-oxo-hexanoyl-homoserine lactone (3OC6-HSL). The stimulatory effect of 3OC6-HSL on primary root elongation was abolished in the AtMYB44 functional-deficiency mutant atmby44. In contrast, an enhanced promoting-impact of 3OC6-HSL on primary root growth was observed in AtMYB44-overexpressing plant MYB44OTA. Cellular analysis indicated that the prolonged primary root elicited by 3OC6-HSL is the consequence of increased cell division in the meristem zone and enhanced cell elongation in the elongation zone, and AtMYB44 may act as a positive regulator in this process. Furthermore, we demonstrated that AtMYB44 might participate in the 3OC6-HSL-mediated primary root growth via regulating the expression of cytokinin- and auxin-related genes. The data establish a genetic connection between the regulatory role of AtMYB44 in phytohormones-related gene expression and plant response to the bacterial QS signal.
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Affiliation(s)
- Qian Zhao
- 1 Biology Institute, Hebei Academy of Sciences; and
- 2 Hebei Engineering and Technology Center of Microbiological Control on Main Crop Disease, 46th South Street of Friendship, Shijiazhuang, 050051, China
| | - Man Li
- 1 Biology Institute, Hebei Academy of Sciences; and
| | - Zhenhua Jia
- 1 Biology Institute, Hebei Academy of Sciences; and
- 2 Hebei Engineering and Technology Center of Microbiological Control on Main Crop Disease, 46th South Street of Friendship, Shijiazhuang, 050051, China
| | - Fang Liu
- 1 Biology Institute, Hebei Academy of Sciences; and
- 2 Hebei Engineering and Technology Center of Microbiological Control on Main Crop Disease, 46th South Street of Friendship, Shijiazhuang, 050051, China
| | - Hong Ma
- 1 Biology Institute, Hebei Academy of Sciences; and
- 2 Hebei Engineering and Technology Center of Microbiological Control on Main Crop Disease, 46th South Street of Friendship, Shijiazhuang, 050051, China
| | - Yali Huang
- 1 Biology Institute, Hebei Academy of Sciences; and
- 2 Hebei Engineering and Technology Center of Microbiological Control on Main Crop Disease, 46th South Street of Friendship, Shijiazhuang, 050051, China
| | - Shuishan Song
- 1 Biology Institute, Hebei Academy of Sciences; and
- 2 Hebei Engineering and Technology Center of Microbiological Control on Main Crop Disease, 46th South Street of Friendship, Shijiazhuang, 050051, China
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The ABA receptor PYL9 together with PYL8 plays an important role in regulating lateral root growth. Sci Rep 2016; 6:27177. [PMID: 27256015 PMCID: PMC4891660 DOI: 10.1038/srep27177] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 05/13/2016] [Indexed: 02/07/2023] Open
Abstract
Abscisic acid is a phytohormone regulating plant growth, development and stress responses. PYR1/PYL/RCAR proteins are ABA receptors that function by inhibiting PP2Cs to activate SnRK2s, resulting in phosphorylation of ABFs and other effectors of ABA response pathways. Exogenous ABA induces growth quiescence of lateral roots, which is prolonged by knockout of the ABA receptor PYL8. Among the 14 members of PYR1/PYL/RCAR protein family, PYL9 is a close relative of PYL8. Here we show that knockout of both PYL9 and PYL8 resulted in a longer ABA-induced quiescence on lateral root growth and a reduced sensitivity to ABA on primary root growth and lateral root formation compared to knockout of PYL8 alone. Induced overexpression of PYL9 promoted the lateral root elongation in the presence of ABA. The prolonged quiescent phase of the pyl8-1pyl9 double mutant was reversed by exogenous IAA. PYL9 may regulate auxin-responsive genes in vivo through direct interaction with MYB77 and MYB44. Thus, PYL9 and PYL8 are both responsible for recovery of lateral root from ABA inhibition via MYB transcription factors.
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Plant MYB Transcription Factors: Their Role in Drought Response Mechanisms. Int J Mol Sci 2015; 16:15811-51. [PMID: 26184177 PMCID: PMC4519927 DOI: 10.3390/ijms160715811] [Citation(s) in RCA: 229] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Revised: 06/18/2015] [Accepted: 06/25/2015] [Indexed: 11/17/2022] Open
Abstract
Water scarcity is one of the major causes of poor plant performance and limited crop yields worldwide and it is the single most common cause of severe food shortage in developing countries. Several molecular networks involved in stress perception, signal transduction and stress responses in plants have been elucidated so far. Transcription factors are major players in water stress signaling. In recent years, different MYB transcription factors, mainly in Arabidopsis thaliana (L.) Heynh. but also in some crops, have been characterized for their involvement in drought response. For some of them there is evidence supporting a specific role in response to water stress, such as the regulation of stomatal movement, the control of suberin and cuticular waxes synthesis and the regulation of flower development. Moreover, some of these genes have also been characterized for their involvement in other abiotic or biotic stresses, an important feature considering that in nature, plants are often simultaneously subjected to multiple rather than single environmental perturbations. This review summarizes recent studies highlighting the role of the MYB family of transcription factors in the adaptive responses to drought stress. The practical application value of MYBs in crop improvement, such as stress tolerance engineering, is also discussed.
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