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The IBI1 Receptor ofβ-Aminobutyric Acid Interacts with VOZ Transcription Factors to Regulate abscisic Acid Signaling and Callose-Associated Defense

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Molecular Plant 2020年第10期13卷 1455-1469页

作者： Roland E.Schwarzenbacher Grace Wardell Joost Stassen Emily Guest Peijun Zhang Estrella Luna Jurriaan Ton P3 Institute for Plant and Soil Biology Department of Animal and Plant SciencesThe University of SheffieldSheffield S102TNUK School of Biosciences University of BirminghamBirmingham B152TTUK

Extemal and internal signals can prime the plant immune system for a faster and/or stronger response to pathogen attack.β-aminobutyric acid(BABA)is an endogenous stress metabolite that induces broad-spectrum disease resistance in plants.BABA perception in Arabidopsis is mediated by the aspartyl tRNA synthetase IBI1,which activates priming of multiple immune responses,including callose-associated cell wall defenses that are under control by abscisic acid(ABA).However,the immediate signaling components after BABA perception by IBI1,as well as the regulatory role of ABA therein,remain unknown.Here,we have studied the early signaling events controlling IBI1-dependent BABA-induced resistance(BABAIR),using untargeted transcriptome and protein interaction analyses.Transcriptome analysis revealed that IBI1-dependent expression of BABA-IR against the biotrophic oomycete Hyaloperonospora arabidopsidis is associated with suppression of ABA-inducible abiotic stress genes.Protein interaction studies identified the VOZ1 and VOZ2 transcription factors(TFs)as IBI1-interacting partners,which are transcrip-tionally induced by ABA but suppress pathogen-induced expression of ABA-dependent genes.Furthermore,we show that VOZ TFs require nuclear localization for their contribution to BABA-IR by mediating augmented expression of callose-associated defense.Collectively,our study indicates that the IBI1-VOZ signaling module channels pathogen-induced ABA signaling toward cell wall defense while simultaneously suppressing abiotic stress-responsive genes.

关键词： IBI1 priming abscisic acid β-aminobutyric acid callose E-MTAB-8720

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ZmOST1 mediates abscisic acid regulation of guard cell ion channels and drought stress responses

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Journal of Integrative Plant Biology 2019年第4期61卷 478-491页

作者： Qiqi Wu Mei Wang Jianlin Shen Donghua Chen Yu Zheng Wei Zhang Key Laboratory of Plant Development and Environmental Adaption Biology Ministry of Education School of Life Science Shandong University

The phytohormone abscisic acid(ABA) is an important mediator in the drought response, participating in, among other processes, stomatal movements. In Arabidopsis thaliana, the serine/threonine protein kinase,OST1, regulates this response, but the function of its maize homolog has yet to be established. Here, we isolated ZmOST1 and show that its encoded protein indeed acts to regulate guard cell movement. ZmOST1 was ubiquitously expressed throughout the plant, being highly expressed in guard cells, and inducible both by exogenous ABA and water stress. Transient expression of a ZmOST1-GFP fusion protein, in maize mesophyll protoplasts, indicated its subcellular localization in the cytoplasm and nucleus. A Zmost1 loss-of-function mutant exhibited reduced sensitivity to ABA-activated slow anion channels in maize guard cells, and reduced drought tolerance. Constitutive expression of ZmOST1, in an A. thaliana ost1-1 mutant rescued the phenotype with respect both to the sensitivity of guard cell slow anion currents to ABA treatment and stomatal closure. Our findings indicate a positive regulatory role for ZmOST1 in guard cell ABA signaling and drought response in maize plants.

关键词： ZmOST1 abscisic acid regulation guard cell

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Alleviation by abscisic acid of Al toxicity in rice bean is not associated with citrate efflux but depends on ABI5-mediated signal transduction pathways

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Journal of Integrative Plant Biology 2019年第2期61卷 140-154页

作者： Wei Fan Jia Meng Xu Pei Wu Zhi Xin Yang He Qiang Lou Wei Wei Chen Jian Fen Jin Shao Jian Zheng Jian Li Yang College of Resources and Environment Yunan Agricultural University State Key Laboratory of Plant Physiology and Biochemistry College of Life Sciences Zhejiang University Institute of Life Sciences College of Life and Environmental Sciences Hangzhou Normal University

Under conditions of aluminum(Al) toxicity,which severely inhibits root growth in acidic soils, plants rapidly alter their gene expression to optimize physiological fitness for survival. abscisic acid(ABA) has been suggested as a mediator between Al stress and gene expression, but the underlying mechanisms remain largely unknown. Here,we investigated ABA-mediated Al-stress responses, using integrated physiological and molecular biology approaches.We demonstrate that Al stress caused ABA accumulation in the root apex of rice bean(Vigna umbellata [Thunb.] Ohwi &Ohashi), which positively regulated Al tolerance. However,this was not associated with known Al-tolerance mechanisms. Transcriptomic analysis revealed that nearly one-third of the responsive genes were shared between the Al-stress and ABA treatments. We further identified a transcription factor, ABI5, as being positively involved in Al tolerance. Arabidopsis abi5 mutants displayed increased sensitivity to Al, which was not related to the regulation of AtALMT1 and AtMATE expression. Functional categorization of ABI5-mediated genes revealed the importance of cell wall modification and osmoregulation in Al tolerance, a finding supported by osmotic stress treatment on Al tolerance. Our results suggest that ABA signal transduction pathways provide an additional layer of regulatory control over Al tolerance in plants.

关键词： Alleviation by abscisic acid of Al toxicity in rice bean is not associated with citrate efflux but depends on ABI5-mediated sign ABA Figure ABI

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Effects of Exogenous Trehalose on the Metabolism of Sugar and abscisic Acid in Tomato Seedlings Under Salt Stress

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Transactions of Tianjin University 2019年第5期25卷 451-471页

作者： Yanchun Feng Xiuyu Chen Yulong He Xiaohong Kou Zhaohui Xue School of Chemical Engineering and Technology Tianjin University

Salt stress a ects the growth and development of plants, which results in a decrease in crop quality and yield. In this study, we used tomato seedlings treated with salt and trehalose as experimental materials and analyzed them using the technique for order preference by similarity to ideal solution analysis to select the optimal trehalose concentration for treatment. We also determined the contents of sugar and abscisic acid (ABA) and detected the expression of genes involved in the metabolism of sugar and ABA by quantitative real-time PCR. Results showed that the optimal trehalose concentration was 2 mmol/L for tomato seedlings under salt stress. Exogenous trehalose decreased the starch content and increased the soluble sugar con- tent by a ecting the expression of genes related to the metabolism of starch and soluble sugar. Exogenous trehalose altered the accumulation and distribution of sugar by inducing the upregulation of sugar transporter genes. Furthermore, trehalose increased the ABA content to induce salt stress response by regulating the expression of genes related to the synthesis and metabolism of ABA. In conclusion, trehalose can e ectively alleviate salt stress and enhance salt tolerance of tomato. These ndings provide a novel perspective and a better resource to investigate the salt tolerance mechanism and a new method for alleviating salt stress in tomato.

关键词： Tomato Trehalose Salt stress Sugar metabolism Sugar transporter abscisic acid

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INHIBITORY EFFECTS OF abscisic ACID ON EPIBRASSINOLIDE-INDUCED SENESCENCE OF DETACHED COTYLEDONS IN CUCUMBER SEEDLIN GS

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Chinese Science Bulletin 1990年第11期35卷 928-931页

作者：赵毓橘徐如涓罗文华 Shanghai Institute of Plant Physiology Academia Sinica Shanghai 200032 PRC

It has been confirmed that ABA promotes the senescence of detached leaves since this phenomenon was reported. ABA serves as an endogenous factor in leaf senescence. This hypothesis has been written into reviews and mo... 详细信息

关键词： epibrassinolide abscisic acid cotyledon senescence.

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Determination of abscisic acid based on the fluorescent quenching of quantum dots

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Science China Chemistry 2010年第1期53卷 245-249页

作者： ZHANG Lei,GUAN HongLiang & HE ZhiKe Key Laboratory of Analytical Chemistry for Biology and Medicine,Ministry of Education College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072,China Key Laboratory of Analytical Chemistry for Biology and Medicine Ministry of Education College of Chemistry and Molecular Sciences Wuhan University Wuhan China

The quenching mechanism of the fluorescence of quantum dots by abscisic acid has been systematically investigated.The quenching constant KSV = 5.1 × 1011 / M was obtained under the optimized condition.On the basis of that,a very sensitive method for the determination of abscisic acid has been developed.The linear equation was F0/F = 0.9309 + 0.5072 C(pmol/L) and its linear range was 0.2-3.0 pmol/L with a correlation coefficient of 0.9939.The limit of detection was 0.09 pmol/L.

关键词： abscisic acid quantum dots superquenching

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abscisic Acid, One of the Key Determinants of in Vitro Shoot Differentiation from Cotyledons of <i>Vigna radiata</i>

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American Journal of Plant Sciences 2014年第5期5卷 704-713页

作者： Suparna Ghosh Saswati Sengupta Amita Pal Division of Plant Biology Bose Institute Kolkata India

Differential regeneration potentiality of two cotyledons (Cot and Cot E) of Vigna radiata seed during in vitro shoot differentiation is now well established. In the present study, endogenous abscisic acid (ABA) level (both bound and free form) was estimated using high performance liquid chromatography technique from these two explant types prior to the induction of in vitro differentiation. Both free and conjugated forms of endogenous ABA were higher in Cot than Cot E. However, the bound form of ABA was higher than free or active form in both the explants. Effects of an ABA catabolic inhibitor, diniconazole on the endogenous ABA production potential were determined. Diniconazole inhibits ABA 8’-hydroxylase, the catabolizing enzyme, resulting in accumulation of free ABA in the cell. It was noted that diniconazole inhibited bound form of ABA formation in a concentration dependant manner with a concomitant increase in the free form and decrease in shoot differentiation from Cot E explants. Likewise, exogenously applied ABA in in vitro culture also resulted in decrease in shoot regeneration frequency from the cotyledonary explants ascertaining the differential level of endogenous ABA is one of the determinants of differential regeneration response of Cot and Cot E under in vitro cultural condition. Cytokinin antagonized inhibitory effect of ABA mediated by cytokinin responsive proteins, such proteins are up regulated differentially in Cot E has recently shown us through proteomic study confirming further the role of ABA.

关键词： abscisic Acid Cotyledons Diniconazole Vigna radiatas

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Exogenous Application of abscisic Acid (ABA)Enhances Chilling Tolerance in Seedlings ofNapier Grass (Pennisetum purpureum Schum.)

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Agricultural Science & Technology 2017年第3期18卷 417-423页

作者： Yong WANG Meilan ZHU Yanqing YANG Intikhab ALAM Xi CHENG Tao QIN Yunhai LU Key Laboratory of Ministry of Education for Genetics Breeding and Multiple Utilization of Crops College of Crop Science Fujian Agriculture and Forestry University Fuzhou 350002 China China National Engineering Research Center of JUNCAO Technology Fujian Agriculture and Forestry University Fuzhou 350002 China

Napier grass, an important forage crop with potentials in multi-purpose applications, is widely grown throughout the tropics and subtropics. Low temperature severely limits its productivity and geographical distribution in temperate regions of the world. In this study, we investigated the effect of exogenous abscisic Acid(ABA) on chilling tolerance of napier grass(Pennisetum purpureum Schum.) seedlings. Seven-day-old napier grass seedlings were cultured in dd H_2O or ABA solution at different concentrations and exposed to 1 ℃ for different time durations. The chilling injury, membrane stability index(MSI) and proline content were estimated from leaf samples. The results showed that there was obvious morphological injury of leaf blighting and restrained growth for the seedlings under chilling stress, but this damage can be largely reduced(by 2/3) when the seedlings were treated by 100 μmol/L ABA in the culture solution, and that the application of exogenous ABA can help to maintain a good stability of leaf cell membrane as expressed by a high MSI value and a low level of proline in leaf cells. These results suggested that exogenous ABA can significantly alleviate chilling injury in napier grass seedlings by maintaining the stability of leaf cell membrane during chilling stress, and that the chilling tolerance was not ensured by a proline accumulation although a passive accumulation of proline was observed in the seedlings under chilling stress. Our results lay a preliminary foundation for future investigations on the molecular mechanisms of ABA induced chilling or freezing tolerance in napier grass.

关键词： Napier grass Pennisetum purpureum Chilling stress abscisic acid Membrane stability Proline content

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Seed Germination in Tomato: A Focus on Interaction between Phytochromes and Gibberellins or abscisic Acid

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American Journal of Plant Sciences 2014年第14期5卷 2163-2169页

作者： Marina Alves Gavassi Gabriela Cabral Fernandes Carolina Cristina Monteiro Lázaro Eustáquio Pereira Peres Rogério Falleiros Carvalho Departamento de Biologia Aplicada à Agropecuária UNESP Jaboticabal Brazil Departamento de Ciências Biológicas ESALQ Piracicaba Brazil

Separately, it is well-documented that phytochromes (phys), gibberellin (GA) and abscisic acid (ABA) strongly control the seed germination in tomato. However, we hipothesized that phys interact with GA or ABA during this response. Thus, we make an analysis of seed germination of ABA deficient (sit), GA constitutive response (pro), phytochrome deficient (au) mutants as well as, specially, au sit and au pro double mutants of tomato?incubated in the dark or light conditions during 120 h [12 h intervals (i)]. Compared to au, which severely?reduced percentage germination (Gi%) and pro, which did not alter Gi%, au pro showed in the light enhanced Gi% and germination speed index (GSI) besides the reduced average germination time (AGT). Moreover, in the dark, germination of au pro was similar to pro. These results indicate that the mechanisms by which GA modulate germination in tomato are light dependent through the phy signaling, whereas intermediary values of Gi%, GSI and AGT in dark and light of au sit compared to au and sit single mutants indicate an additive effect of the au and sit mutations, suggesting that ABA and phy may act through the parallel signaling pathway.

关键词： abscisic Acid Gibberellins Phytochromes Seed Germination Tomato

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Heterologous expression of Hp BHY and Cr BKT increases heat tolerance in Physcomitrella patens

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Plant Diversity 2019年第4期41卷 266-274页

作者： Jianfang He Ping Li Heqiang Huo Lina Liu Ting Tang Mingxia He Junchao Huang Li Liu Key Laboratory of Economic Plants and Biotechnology Kunming Institute of BotanyChinese Academy of SciencesYunnan Key Laboratory for Wild Plant ResourcesKunming650201China University of Chinese Academy of Sciences Beijing100049China Mid-Florida Research and Education Center Department of Environmental HorticultureUniversity of FloridaFL32703USA

Heat stress can restrict plant growth,development,and crop yield.As essential plant antioxidants,carotenoids play significant roles in plant stress resistance.b-carotene hydroxylase(BHY)and b-carotene ketolase(BKT),which catalyze the conversions of b-carotene to zeaxanthin and b-carotene to canthaxanthin,respectively,are key enzymes in the carotenoid biosynthetic pathway,but little is known about their potential functions in stress resistance.Here,we investigated the roles of b-carotene hydroxylase and b-carotene ketolase during heat stress in Physcomitrella patens through expressing a b-carotene ketolase gene from Chlamydomonas reinhardtii(Cr BKT)and a b-carotene hydroxylase gene from Haematococcus pluvialis(Hp BHY)in the moss P.patens.In transgenic moss expressing these genes,carotenoids content increased(especially lutein content),and heat stress tolerance increased,with reduced leafy tissue necrosis.To investigate the mechanism of this heat stress resistance,we measured various physiological indicators and found a lower malondialdehyde level,higher peroxidase and superoxide dismutase activities,and higher endogenous abscisic acid and salicylate content in the transgenic plants in response to high-temperature stress.These results demonstrate that Cr BKT and Hp BHY increase plant heat stress resistance through the antioxidant and damage repair metabolism,which is related to abscisic acid and salicylate signaling.

关键词： Carotenoids Heat stress Antioxidant abscisic acid Physcomitrella patens

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