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Abiotic stress treatment reveals expansin like A gene OfEXLA1 improving salt and drought tolerance of Osmanthus fragrans by responding to abscisic acid

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Horticultural Plant Journal 2024年第2期10卷 573-585页

作者： Bin Dong Qianqian Wang Dan Zhou Yiguang Wang Yunfeng Miao Shiwei Zhong Qiu Fang Liyuan Yang Zhen Xiao Hongbo Zhao School of Landscape Architecture Zhejiang Agriculture and Forestry UniversityHangzhouZhejiang 311300China Zhejiang Provincial Key Laboratory of Germplasm Innovation and Utilization for Garden Plants HangzhouZhejiang 311300China Key Laboratory of National Forestry and Grassland Administration on Germplasm Innovation and Utilization for Southern Garden Plants HangzhouZhejiang 311300China

Sweet osmanthus(Osmanthus fragrans) is a having general approval aromatic tree in China that is widely applied to landscaping and gardening. However, the evergreen tree adaptability is limited by many environmental stresses. Currently, limited information is available regarding the genetic analysis and functional identification of expansin genes in response to abiotic stress in sweet osmanthus. In this study, a total of 29 expansin genes were identified and divided into four groups by genome-wide analysis from the sweet osmanthus genome. Transcriptome and quantitative Real-time PCR analysis showed that the cell wall-localized protein expansin-like A(OfEXLA1) gene was significantly induced by salt and drought treatment. Histochemical GUS staining of transgenic Arabidopsis lines in which GUS activity was driven with the OfEXLA1 promoter, GUS activity was significantly induced by salt, drought, and exogenous abscisic acid(ABA). In yeast, we found OfEXLA1overexpression significantly improved the population of cells compared with wild-type strains after NaCl and polyethylene glycol(PEG)treatment. Additionally, OfEXLA1 overexpression not only promoted plant growth, but also improved the salt and drought tolerance in Arabidopsis. To gain insight into the role of ABA signaling in the regulation of OfEXLA1 improving abiotic tolerance in sweet osmanthus, four differentially expressed ABA Insensitive 5(ABI5)-like genes(OfABL4, OfABL5, OfABL7, and OfABL8) were identified from transcriptome, and dualluciferase(dual-LUC) and yeast one hybrid(Y1H) assay showed that OfABL4 and OfABL5 might bind to OfEXLA1 promoter to accumulate the OfEXLA1 expression by responding to ABA signaling to improve abiotic tolerance in sweet osmanthus. These results provide the information for understanding the molecular functions of expansin-like A gene and molecular breeding of sweet osmanthus in future.

关键词： Osmanthus fragrans Abiotic tolerance Expansin abscisic acid

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Melatonin Alleviates abscisic acid Deficiency Inhibition on Photosynthesis and Antioxidant Systems in Rice under Salt Stress

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Phyton-International Journal of Experimental Botany 2024年第7期93卷 1421-1440页

作者： Feiyu Yan Xin Chen Zhenzhen Wang Yuxuan Xia Dehui Zheng Sirui Xue Hongliang Zhao Zhiwei Huang Yuan Niu Guoliang Zhang School of Life Sciences and Food Engineering Huaiyin Institute of TechnologyHuai’an223003China Jianghuai Plain Crop Industry Engineering Research Institute Huaiyin Institute of TechnologyHuai’an223003China

Melatonin and abscisic acid,as major plant hormones,play important roles in the physiological and biochemical activities of crops,but the interaction between the two under salt stress is not yet *** study investigated the endogenous levels of melatonin and abscisic acid in rice by using exogenous melatonin,abscisic acid,and their synthetic inhibitors,and examined their interactions under salt *** research results indicate that melatonin and abscisic acid can improve rice salt *** alleviated the salt sensitivity caused by abscisic acid deﬁciency,increased antioxidant enzyme activity and antioxidant content in rice treated with abscisic acid synth-esis inhibitors,and reduced total reactive oxygen species content and thiobarbituric acid reactive substance *** also increased the activity of key photosynthetic enzymes and the content of photosynthetic pigments,maintaining the parameters of photosynthetic gas exchange and chlorophyllﬂ*** summary,melatonin alleviated the effects of abscisic acid deﬁciency on photosynthesis and antioxidant systems in rice and improved salt *** study is beneﬁcial for expanding the understanding of melatonin regulation of crop salt tolerance.

关键词： Melatonin abscisic acid salt stress rice photosynthesis antioxidant system

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Effects of abscisic acid on Cold Resistance in Digitaria sanguinalis(L.)Scop.

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Agricultural Biotechnology 2024年第1期13卷 15-16,19页

作者： Rongbo ZHOU Yihong HU Li ZHOU Jie PENG Fan XIE Chenzhong JIN Key Laboratory of Crop Pest Green Control Hunan University of HumanitiesScience and TechnologyLoudi 417000China Lianyuan Fengleyuan Agricultural Development Co. Ltd.Lianyuan 417008China

[Objectives]This study was conducted to detect the protective effect of abscisic acid on chilling injury of Digitaria sanguinalis(L.)Scop,and whether this effect is related to antioxidant enzymes and osmotic adjustment.[Methods]*** plants were sprayed with abscisic acid solution,and exposed to cold stress at 15℃for 3 d after one day and then at 5℃for 25 to 30 d in a growth *** changes of plant osmotic potential under this treatment were detected.[Results]Under low temperature stress,the osmotic potential of plants in the abscisic acid treatment and the control increased,but the osmotic potential level of the abscisic acid treatment plants was *** SOD activity of plants in the ABA treatment and the control decreased under low temperature *** low temperature stress,the activity of catalase and peroxidase in ABA-treated plants was higher than that in control plants.[Conclusions]This study provides a theoretical basis for the impact of abscisic acid on the physiological response of *** to cold injury.

关键词： Digitaria sanguinalis abscisic acid CAT POD ROS SOD

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BAK1 plays contrasting roles in regulating abscisic acid-induced stomatal closure and abscisic acid-inhibited primary root growth in Arabidopsis

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Journal of Integrative Plant Biology 2022年第6期64卷 1264-1280页

作者： Jinping Deng Lingyao Kong Yinhua Zhu Dan Pei Xuexue Chen Yu Wang Junsheng Qi Chunpeng Song Shuhua Yang Zhizhong Gong State Key Laboratory of Plant Physiology and Biochemistry College of Biological SciencesChina Agricultural UniversityBeijing 100193China College of Life Sciences Qingdao UniversityQingdao 266071China Collaborative Innovation Center of Crop Stress Biology Institute of Plant Stress BiologyHenan UniversityKaifeng 475001HenanChina Institute of Life Science and Green Development School of Life SciencesHebei UniversityBaoding 071002China

The mechanisms that balance plant growth and stress responses are poorly understood, but they appear to involve abscisic acid(ABA) signaling mediated by protein kinases. Here, to explore these mechanisms, we examined the responses of Arabidopsis thaliana protein kinase mutants to ABA treatment. We found that mutants of BRASSINOSTEROID INSENSITIVE 1-ASSOCIATED RECEPTOR KINASE 1(BAK1) were hypersensitive to the effects of ABA on both seed germination and primary root growth. The kinase OPEN STOMATA 1(OST1) was more highly activated by ABA in bak1 mutant than the wild type. BAK1 was not activated by ABA treatment in the dominant negative mutant abi1-1 or the pyr1 pyl4 pyl5 pyl8 quadruple mutant, but it was more highly activated by this treatment in the abi1-2 abi2-2 hab1-1 loss-of-function triple mutant than the wild type. BAK1 phosphorylates OST1 T146 and inhibits its activity. Genetic analyses suggested that BAK1 acts at or upstream of core components in the ABA signaling pathway, including PYLs, PP2 Cs,and Sn RK2 s, during seed germination and primary root growth. Although the upstream brassinosteroid(BR) signaling components BAK1 and BR INSENSITIVE 1(BRI1) positively regulate ABAinduced stomatal closure, mutations affecting downstream components of BR signaling, including BRASSINOSTEROID-SIGNALING KINASEs(BSKs)and BRASSINOSTEROID-INSENSITIVE 2(BIN2), did not affect ABA-mediated stomatal movement. Thus,our study uncovered an important role of BAK1 in negatively regulating ABA signaling during seed germination and primary root growth, but positively modulating ABA-induced stomatal closure, thus optimizing the plant growth under drought stress.

关键词： abscisic acid BAK1 primary root growth stomatai closure

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CKL2 mediates the crosstalk between abscisic acid and brassinosteroid signaling to promote swift growth recovery after stress in Arabidopsis

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Journal of Integrative Plant Biology 2023年第1期65卷 64-81页

作者： Xiaoyun Zhao Tianren Zhang Li Bai Shuangshuang Zhao Yan Guo Zhen Li State Key Laboratory of Plant Physiology and Biochemistry College of Biological Sciences China Agricultural UniversityBeijing 100193 China Key Laboratory of Plant Stress Life Science College Shandong Normal UniversityJinan 250014 China

Plants must adapt to the constantly changing environment. Adverse environmental conditions trigger various defensive responses, including growth inhibition mediated by phytohormone abscisic acid(ABA). When the stress recedes, plants must transit rapidly from stress defense to growth recovery, but the underlying mechanisms by which plants switch promptly and accurately between stress resistance and growth are poorly understood. Here, using quantitative phosphoproteomics strategy, we discovered that early ABA signaling activates upstream components of brassinosteroid(BR) signaling through CASEIN KINASE 1-LIKE PROTEIN 2(CKL2).Further investigations showed that CKL2 interacts with and phosphorylates BRASSINOSTEROID INSENSITIVE1(BRI1), the main BR receptor, to maintain the basal activity of the upstream of BR pathway in plants exposed to continuous stress conditions. When stress recedes, the elevated phosphorylation of BRI1 by CKL2 contributes to the swift reactivation of BR signaling, which results in quick growth recovery. These results suggest that CKL2 plays a critical regulatory role in the rapid switch between growth and stress resistance. Our evidence expands the understanding of how plants modulate stress defense and growth by integrating ABA and BR signaling cascades.

关键词： abscisic acid brassinosteroids CKL2 growth recovery stress

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Phenotype and mechanism analysis of plant dwarfing in pear regulated by abscisic acid

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Journal of Integrative Agriculture 2022年第5期21卷 1346-1356页

作者： LIU Jian-long ZHANG Chen-xiao LI Tong-tong LIANG Cheng-lin YANG Ying-jie LI Ding-Li CUI Zhen-hua WANG Ran SONG Jian-kun College of Horticulture Qingdao Agricultural UniversityQingdao 266109P.R.China Haidu College Qingdao Agricultural UniversityLaiyang 265200P.R.China

Close planting of dwarf varieties is currently the main cultivation direction for pear trees,and the screening of excellent dwarf varieties is an important goal for *** this study,the dwarfing pear variety‘601D’and its vigorous mutant‘601T’were used to show their biological characteristics and further explore the dwarfing mechanism in‘601D’.The biological characteristics showed that‘601D’had a shorter internode length,a shorter and more compact tree body,thicker and broader leaves,lower stomata density,larger stomata size(dimension),and higher photosynthetic *** biological characteristics of‘601T’showed notable *** results of endogenous hormone tests indicated that the contents of abscisic acid(ABA),ABA-glucosyl ester,and GA_(4) were higher in‘601D’,but the trans-zeatin content was *** transcriptomic analysis,significant differences were found in the biosynthetic and metabolic pathways of *** transcription factors such as bHLH,WRKY,and homeobox also participated in the regulation of plant *** therefore examined three hormones with obvious differences with‘601T’,and found that only ABA could induce‘601T’to return to a dwarfing plant ***,we conclude that the dwarfing of‘601D’is caused by an excessive accumulation of *** study provides a new theoretical basis for breeding dwarf varieties.

关键词： dwarf pear phenotype abscisic acid transcriptomic analysis

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NaCl Facilitates Cell Wall Phosphorus Reutilization in abscisic acid Dependent Manner in Phosphorus Deficient Rice Root

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Rice science 2023年第2期30卷 138-147页

作者： YANG Xiaozheng LIU Yusong HUANG Jing TAO Ye WANG Yifeng SHEN Renfang ZHU Xiaofang State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of ScienceNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China College of Land Resources and Environment Jiangxi Agricultural UniversityNanchang 330045China State Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou 311400China

Phosphorus(P) starvation in rice facilitates the reutilization of root cell wall P by enhancing the pectin content. NaCl modulates pectin content, however, it is still unknown whether NaCl is also involved in the process of pectin regulated cell wall P remobilization in rice under P starved conditions. In this study, we found that 10 mmol/L NaCl increased the shoot and root biomasses under P deficiency to a remarkable extent, in company with the elevated shoot and root soluble P contents in rice. Further analysis indicated that exogenous NaCl enhanced the root cell wall P mobilization by increasing the pectin methylesterase activity and uronic acid content in pectin suggesting the involvement of NaCl in the process of cell wall P reutilization in P starved rice roots. Additionally, exogenous NaCl up-regulated the expression of P transporter OsPT6, which was induced by P deficiency, suggesting that NaCl also facilitated the P translocation prominently from root to shoot in P starved rice. Moreover, exogenous abscisic acid(ABA) can reverse the NaCl-mediated mitigation under P deficiency, indicating the involvement of ABA in the NaCl regulated root cell wall P reutilization. Taken together, our results demonstrated that NaCl can activate the reutilization of root cell wall P in P starved rice, which is dependent on the ABA accumulation pathway.

关键词： abscisic acid cell wall NaCl phosphorus transporter phosphorus deficiency remobilization

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Fiber-specific increase of carotenoid content promotes cotton fiber elongation by increasing abscisic acid and ethylene biosynthesis

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The Crop Journal 2023年第3期11卷 774-784页

作者： Jianyan Zeng Dan Yao Ming Luo Lingli Ding Yi Wang Xingying Yan Shu’e Ye Chuannan Wang Yiping Wu Jingyi Zhang Yaohua Li Lingfang Ran Yonglu Dai Yang Chen Fanlong Wang Hanyan Lai Nian Liu Nianjuan Fang Yan Pei Yuehua Xiao Biotechnology Research Center Southwest UniversityChongqing 400715China

Cotton fiber is a raw material for the global textile industry and fiber quality is essential to its industrial *** are plant secondary metabolites that may serve as dietary components,regulate light harvesting,and scavenge reactive oxygen *** carotenoids accumulate predominantly in rapidly elongating cotton fibers,their roles in cotton fiber development remain poorly *** this study,a fiber-specific promoter proSCFP was applied to drive the expression of GhOR1Del,a positive regulator of carotenoid accumulation,to upregulate the carotenoid level in cotton fiber in *** length,strength,and fineness were increased in proSCFP:GhOR1Del transgenic cotton and abscisic acid(ABA)and ethylene contents were increased in elongating *** ABA downstream regulator GhbZIP27a stimulated the expression of the ethylene synthase gene GhACO3 by binding to its promoter,suggesting that ABA promoted fiber elongation by increasing ethylene *** findings suggest the involvement of carotenoids and ABA signaling in promoting cotton fiber elongation and provide a strategy for improving cotton fiber quality.

关键词： abscisic acid Carotenoid Cotton fiber elongation Ethylene ORANGE gene

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The MIEL1-ABI5/MYB30 regulatory module fine tunes abscisic acid signaling during seed germination

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Journal of Integrative Plant Biology 2022年第4期64卷 930-941页

作者： Kaili Nie Hongyun Zhao Xiaopei Wang Yanli Niu Huapeng Zhou Yuan Zheng State Key Laboratory of Crop Stress Adaptation and Improvement Key Laboratory of Plant Stress BiologySchool of Life SciencesHenan UniversityKaifeng 475001China Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education College of Life SciencesSichuan UniversityChengdu 610064China

The transcription factor abscisic acid INSENSITIVE5(ABI5)plays a crucial role in abscisic acid(ABA)signaling during seed ***,how ABI5 is regulated during this process is poorly ***,we report that the ubiquitin E3 ligase MIEL1 and its target transcription factor MYB30 modulate ABA responses in Arabidopsis thaliana during seed germination and seedling establishment via the precise regulation of ***1 interacts with and ubiquitinates ABI5 to facilitate its degradation during *** transcription factor MYB30,whose turnover is mediated by MIEL1 during seed germination,also interacts with ABI5 to interfere with its transcriptional ***30 functions downstream of MIEL1 in the ABA response,and both are epistatic to ABI5 in ABA-mediated inhibition of seed germination and postgerminative *** treatment induces the degradation of MIEL1 and represses the interaction between MIEL1 and ABI5/MYB30,thus releasing both ABI5 and *** results demonstrate that MIEL1 directly mediates the proteasomal degradation of ABI5 and inhibits its activity via the release of its target protein MYB30,thus ensuring precise ABA signaling during seed germination and seedling establishment.

关键词： ABI5 abscisic acid MIEL1 MYB30 seed germination transcriptional regulation ubiquitination

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Identification and Expression Analysis of abscisic acid Signal Transduction Genes in Hemp Seeds

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Phyton-International Journal of Experimental Botany 2023年第7期92卷 2087-2103页

作者： Cong Hou Kang Ning Xiuye Wei Yufei Cheng Huatao Yu Haibin Yu Xia Liu Linlin Dong School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan430070China Yunnan Hemp Industrial Investment Co. Ltd.Kunming650000China

abscisic acid(ABA)is involved in regulating diverse biological processes,but its signal transduction genes and roles in hemp seed germination are not well ***,the ABA signaling pathway members,PYL,PP2C and SnRK2 gene families,were identified from the hemp reference genome,including 7 CsPYL(pyrab-actin resistance1-like,ABA receptor),8 CsPP2CA(group A protein phosphatase 2c),and 7 CsSnRK2(sucrose nonfermenting1-related protein kinase 2).The content of ABA in hemp seeds in germination stage is lower than that in non-germination *** ABA(1 or 10μM)treatment had a significant regulatory effect on the selected PYL,PP2C,SnRK2 gene ***3 and CsHAI1 were most significantly affected by exogenous ABA *** two-hybrid experiments were performed to reveal that CsPYL5,CsSnRK2.2,and CsSnRK2.3 could interact with CsPP2CA7 and demonstrate that this interaction was *** results indicated that CsPYL5,CsSnRK2.2,CsSnRK2.3 and CsPP2CA7 might involve in the ABA signaling transduction pathway of hemp seeds during the hemp seed germination *** study suggested that novel genetic views can be brought into investigation of ABA signaling pathway in hemp seeds and lay the foundation for further exploration of the mechanism of hemp seed germination.

关键词： Hemp seeds abscisic acid seed germination PYL-PP2C-SnRK2 gene expression

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