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The decoupling between gas exchange and water potential of Cinnamomum camphora seedlings during drought recovery and its relation to aba accumulation in leaves

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Journal of Plant Ecology 2020年第6期13卷 683-692页

作者： Honglang Duan Defu Wang Xiaohua Wei Guomin Huang Houbao Fan Shuangxi Zhou Jianping Wu Wenfei Liu David TTissue Songze Wan Institute for Forest Resources&Environment of Guizhou Key Laboratory of Forest Cultivation in Plateau Mountain of Guizhou ProvinceCollege of ForestryGuizhou UniversityGuiyang 550025China Jiangxi Provincial Key Laboratory for Restoration of Degraded Ecosystems&Watershed Ecohydrology Nanchang Institute of TechnologyNanchang 330099China Department of Earth Environmental and Geographic SciencesUniversity of British Columbia OkanaganKelownaBC V1V 1V7Canada The New Zealand Institute for Plant and Food Research Ltd. Hawke’s BayNew Zealand Laboratory of Ecology and Evolutionary Biology Yunnan UniversityKunming 650500China Hawkesbury Institute for the Environment Hawkesbury CampusWestern Sydney UniversityLocked Bag 1797PenrithNSW 2751Australia College of Forestry Jiangxi Agricultural UniversityNanchang 330045China

Aims Drought stress and the degree of drought severity are predicted to rise under highly variable patterns of precipitation due to climate change,while the capacity of trees to cope with drought recovery through physiological and biochemical adjustment remains *** aimed to examine the coupling of physiology and biochemistry in trees during drought and the following *** Potted seedlings of Cinnamomum camphora were grown under well watered conditions prior to the experimental drought stress,which was initiated by withholding *** were rewatered following attainment of two drought severities:mild drought(stomatal closure)and moderate drought(ψxylem=−1.5 MPa).We measured leaf-level water potential,gas exchange(photosynthesis and stomatal conductance),abscisic acid(aba),proline and non-structural carbohydrates(NSCs)concentrations in seedlings of *** during drought and a 4-day *** Findings We found that drought severity largely determined physiological and biochemical responses and affected the rate of *** closure occurred at the mild drought stress,accompanied with aba accumulation in leaves and decline in water potential,while leaf proline accumulation and variable NSC were evident at the moderate drought *** severe drought stress led to delayed recovery of gas exchange,but it did not have significant effect on water potential *** relationships of water potential and gas exchange differed during drought stress and post-drought *** was tight coupling between water potential and gas exchange during drought,but not during rewatering due to high aba accumulation in leaves,thereby delaying recovery of stomatal *** results demonstrate that aba could be an important factor in delaying the recovery of stomatal conductance following rewatering and after water potential recovery of ***,greater drought severity had significant impacts on the rate of recove

关键词： drought recovery gas exchange aba NSC proline

Arabidopsis F-box gene FOA1 involved in aba signaling

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Science China(Life Sciences) 2012年第6期55卷 497-506页

作者： PENG Juan YU DaShi WANG LiQun XIE MinMin YUAN CongYing WANG Yu TANG DongYing ZHAO XiaoYing LIU XuanMing College of Life Sciences State Key Laboratory of Chemo/Biosensing and ChemometricsHunan UniversityChangsha 410082China

The expression of FOAl （F-box overexpressed/oppressed aba signaling） in different organs of Arabidopsis, and in response to aba and NaCI, was analyzed. The expression level of FOAl is higher in the root and is lower in the stem, and is induced rapidly by aba and NaC1. The phenotypes of T-DNA insertion mutant foal and FOAl overexpression lines FOAloxl and FOAlox2 were analyzed. The foal mutant exhibited a lower germination rate, shorter root length, more stomatal opening, in- creased proline accumulation and hypersensitivity to aba compared with the wild type. In contrast, the overexpression lines showed lower sensitivity to aba than the wild type. The expression levels of several aba and stress-responsive transcription factors and genes were altered in the foal mutant in response to aba. Compared with the wild type, the expression levels of aba-responsive transcription factors were higher, but aba and stress-responsive genes were lower in foal mutant. This study demonstrates that FOAl is an aba signaling-related gene, and may play a negative role in aba signaling.

关键词： F-box gene FOAl aba signaling Arabidopsis

The NAC transcription factor MdNAC4 positively regulates nitrogen deficiency‑induced leaf senescence by enhancing aba biosynthesis in apple

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Molecular Horticulture 2023年第1期3卷 337-356页

作者： Binbin Wen Xuehui Zhao Xingyao Gong Wenzhe Zhao Mingyue Sun Xiude Chen Dongmei Li Ling Li Wei Xiao State Key Laboratory of Crop Biology College of Horticulture Science and EngineeringShandong Agricultural UniversityTaian 271018ShandongChina College of Seed and Facility Agricultural Engineering Weifang UniversityWeifang 261061ShandongChina

Although it is well established that nitrogen(N)deficiency induces leaf senescence,the molecular mechanism of N deficiency-induced leaf senescence remains largely ***,we show that an abscisic acid(aba)-responsive NAC transcription factor(TF)is involved in N deficiency-induced leaf *** overexpression of MdNAC4 led to increased aba levels in apple calli by directly activating the transcription of the aba biosynthesis gene *** addition,MdNAC4 overexpression promoted N deficiency-induced leaf *** investigation showed that MdNAC4 directly bound the promoter of the senescence-associated gene(SAG)MdSAG39 and upregulated its ***,the function of MdNAC4 in promoting N deficiency-induced leaf senescence was enhanced in the presence of ***,we identified an interaction between the aba receptor protein MdPYL4 and the MdNAC4 ***,MdPYL4 showed a function similar to that of MdNAC4 in aba-mediated N deficiencyinduced leaf *** findings suggest that aba plays a central role in N deficiency-induced leaf senescence and that MdPYL4 interacts with MdNAC4 to enhance the response of the latter to N deficiency,thus promoting N deficiency-induced leaf *** conclusion,our results provide new insight into how MdNAC4 regulates N deficiency-induced leaf senescence.

关键词： Apple MdNAC4 MdPYL4 N deficiency aba Leaf senescence

Seasonal changes of endogenous aba and cytokinins in environmental adaptation of different ecotypes of reed plants

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Journal of Environmental Sciences 1995年第4期7卷 449-454页

作者： Wang Hongliang , Zhang Chenglie(Department of Biology, Lanzhou University , Lanzhou 730000 , China)

ＳｅａｓｏｎａｌｃｈａｎｇｅｓｏｆｅｎｄｏｇｅｎｏｕｓＡＢＡａｎｄｃｙｔｏｋｉｎｉｎｓｉｎｅｎｖｉｒｏｎｍｅｎｔａｌａｄａｐｔａｔｉｏｎｏｆｄｉｆｆｅｒｅｎｔｅｃｏｔｙｐｅｓｏｆｒｅｅｄｐｌａｎｔｓＷａｎｇＨｏｎｇｌ... 详细信息

ＳｅａｓｏｎａｌｃｈａｎｇｅｓｏｆｅｎｄｏｇｅｎｏｕｓＡＢＡａｎｄｃｙｔｏｋｉｎｉｎｓｉｎｅｎｖｉｒｏｎｍｅｎｔａｌａｄａｐｔａｔｉｏｎｏｆｄｉｆｆｅｒｅｎｔｅｃｏｔｙｐｅｓｏｆｒｅｅｄｐｌａｎｔｓＷａｎｇＨｏｎｇｌｉａｎｇ，ＺｈａｎｇＣｈｅｎｇｌｉ...

关键词： aba cytokinin ecotype environmental adaptation Phragmites communis T.

MAP kinase specifically mediates the aba-induced H_2O_2 generation in guard cells of Vicia faba L.

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Chinese Science Bulletin 2003年第18期48卷 1919-1926页

作者： JIANG Jing1,2, AN Guoyong1, WANG Pengcheng1, WANG Pengtao1, HAN Jinfeng2, JIA Yanbin1 & SONG Chunpeng1 1. College of Life Sciences, Henan University, Kaifeng 475001, China 2. College of Agriculture Science, Henan Agriculture University, Zheng-zhou 450001, China Correspondence should be addressed to Song Chunpeng (e-mail: songcp @henu. ***) College of Life Sciences Henan University Kaifeng China College of Agriculture Science Henan Agriculture University Zhengzhou China

Mitogen-activated protein (MAP) kinase is involved in aba- or H2O2-signaling, and H2O2 acts as inter-mediate in the downstream of aba signal transduction pathway, which has recently emerged as a secondary mes-senger of aba signaling. Using an epidermal strip bioassay and laser scanning confocal microscope, we provided the first evidence that MAP kinase plays an important role in H2O2 signal initial, amplification and specific targeting in response to stimuli in guard cells. aba- or H2O2-induced Vicia faba stomatal closure was inhibited or reversed by the specific inhibitor PD98059 of MEK1/2; the guard cells were pre-incubated or -microinjected by 10 mmol·L-1 PD98059, aba could not enhance the fluorescence intensity of H2O2 probe dichlorofluorescein (DCF). Meanwhile, after aba induced the H2O2 accumulation in guard cells, the exogenous or intracellular PD98059 could reduce the DCF fluorescence intensity. Most interestingly, on the contrary to aba, the DCF fluorescence intensity of guard cells treated by 100 mmol·L-1 salicylic acid (SA) was not down-regulated by PD98059, yet PD98059 did not regulate the stomatal move-ment being induced by light, dark or salicylic acid. These results suggest that MEK1/2 could mediate stomatal closure by abolishing the aba-induced H2O2 generation/accumula- tion in the specific manner.

关键词： MAP kinase PD98059 aba H2O2 guard cells.

Effects of IAA and aba on the Immature Peach Fruit Development Process

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Horticultural Plant Journal 2019年第4期5卷 145-154页

作者： Nana Liu Department of Civil and Architecture Changzhou Institute of Technology

Peach(Prunus persica cv. Dajiubao) was chosen as a model to clarify the roles of IAA and aba during the fruit ripening process. Seventy days after flowering(DAF), the fruits were treated with IAA and aba(0.1 mmol·L-1 and 1 mmol·L-1, respectively) and with the IAA transporter inhibitor(NPA) and the aba biosynthesis inhibitor(NDGA). IAA decreased the fruit aba concentration, and increased ethylene concentration, leading to fruit(70 DAF) softening and coloration. NPA had the opposite effect. aba decreased IAA and ethylene concentrations, leading to fruit hardness and lack of color. NDGA had similar effects as with IAA application. A q PCR analysis indicated that in immature fruits, the expression levels of ethylene biosynthesis and signaling genes(PpACS, PpACO, PpETR, PpERF2), anthocyanin biosynthesis genes(PpCHS, PpDFR, PpF3 H, PpUFGT), cell wall softening genes(PpEXP1, PpEXP2, PpPG2, PpPME), and auxin biosynthesis genes(PpPIN, PpTIR1) were upregulated by IAA application but were inhibited by NPA. In contrast, these ripening-related genes were downregulated by aba application, but upregulated by NDGA. Generally, the immature fruit ripening process requires a high IAA concentration to generate a large amount of ethylene. aba appeared to modulate ripening through interference not only with ethylene and cell wall related genes but also with auxin-related genes.

关键词： Peach IAA aba Fruit development Gene expression

Involvement of the aba-and H_(2)O_(2)-Mediated Ascorbate-Glutathione Cycle in the Drought Stress Responses of Wheat Roots

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Phyton-International Journal of Experimental Botany 2024年第2期93卷 329-342页

作者： Mengyuan Li Zhongye Gao Lina Jiang Leishan Chen Jianhui Ma College of Life Science Henan Normal UniversityXinxiang453007China School of Life Science and Basic Medicine Xinxiang UniversityXinxiang453003China

Abscisic acid(aba),hydrogen peroxide(H_(2)O_(2)) and ascorbate(AsA)–glutathione(GSH)cycle are widely known for their participation in various ***,the relationship between aba and H_(2)O_(2) levels and the AsA–GSH cycle under drought stress in wheat has not been *** this study,a hydroponic experiment was conducted in wheat seedlings subjected to 15%polyethylene glycol(PEG)6000–induced *** stress caused the rapid accumulation of endogenous aba and H_(2)O_(2) and significantly decreased the number of root tips compared with the *** application of aba significantly increased the number of root tips,whereas the application of H_(2)O_(2) markedly reduced the number of root tips,compared with that under 15%*** addition,drought stress markedly increased the DHA,GSH and GSSG levels,but decreased the AsA levels,AsA/DHA and GSH/GSSG ratios compared with those in the *** activities of the four enzymes in the AsA–GSH cycle were also markedly increased under drought stress,including glutathione reductase(GR),ascorbate peroxidase(APX),monodehydroascorbate reductase(MDHAR)and dehydroascorbate reductase(DHAR),compared with those in the ***,the application of an aba inhibitor significantly inhibited GR,DHAR and APX activities,whereas the application of an H_(2)O_(2) inhibitor significantly inhibited DHAR and MDHAR ***,the application of aba inhibitor significantly promoted the increases of H_(2)O_(2) and the application of H_(2)O_(2) inhibitor significantly blocked the increases of aba,compared with those under 15% *** together,the results indicated that aba and H_(2)O_(2) probably interact under drought stress in wheat;and both of them can mediate drought stress by modulating the enzymes in AsA–GSH cycle,where aba acts as the main regulator of GR,DHAR,and APX activities,and H_(2)O_(2) acts as the main regulator of DHAR and MDHAR activities.

关键词： aba H_(2)O_(2) AsA-GSH cycle drought stress wheat roots

SYNTHESIS OF AB AND aba TYPES POLYSTYRENE (A)-POLYOXYETHYLENE(B) BLOCK COPOLYMERS AND CHARACTERIZATION OF THEIR STRUCTURES

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Chinese Journal of Polymer Science 1985年第2期3卷 124-130页

作者：周培光谢洪泉 Hubei Research Institute of Chemistry Wuhan

α-Phenyl ethyl potassium was synthesized and used in the preparation of AB type polysty-rene (A)-polyoxyethylene (B) block copolymer. The effects of polymerization time and temperaturewere studied. aba type block copolymers were prepared by combining AB type block copolymerscontaining one hydroxyl end group using toluene diisocyanate as coupling agent. Both copolymerswere purified, characterized by NMR, IR, UV. DSC, polarized microscopy and X-ray diffractionmethod and compared with mixture of homopolymers.

关键词： aba POLYOXYETHYLENE SYNTHESIS OF AB AND aba TYPES POLYSTYRENE BLOCK COPOLYMERS AND CHARACTERIZATION OF THEIR STRUCTURES

Protein phosphorylation is involved in the water stress-induced aba accumulation in the roots of Malus hupehensis Rehd

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Chinese Science Bulletin 2001年第10期46卷 855-858页

作者： ZHANG Dapeng, YANG Hongqiang, JIA Wensuo & HUANG Conglin1. Laboratory of Molecular Developmental Biology of Fruit Trees, China Agricultural University, Beijing 100094, China 2. The Key Laboratory of Plant Physiology and Biochemistry of Agricultural Ministry, China Agricultural University, Beijing 100094, China Laboratory of Molecular Developmental Biology of Fruit Trees China Agricultural University Beijing China The Key Laboratory of Plant Physiology and Biochemistry of Agricultural Ministry China Agricultural University Beijing China

Water stress-induced aba accumulation plays a key role in the root to shoot communication and/or the cell to cell signaling under the soil stresses. The signaling of the water stress itself that leads to the accumulation, however, is less known. In this study, we subjected the roots of Malus hupehensis seedlings to water stress treatment and investigated the aba accumulation in relation to protein phos-phorylation. Our results showed that aba accumulation could be substantially triggered in 40 min and reached 4 folds in 100 min after treatment with 30% PEG 6000 (polyethylene glycol). The water stress treatment also led to a substantial enhancement of total kinase activity, assessed with histone-111 as substrate, in 15 min and a maximum enhancement in 30 min before it declined to initial level. The Ca2+-dependent kinase activity showed a similar, if not more sensitive, trend. When the roots were fed with labeled 32P-ATP, water stress enhanced the labeling of proteins, which showed a maximum labeling at

关键词： aba (abscisic acid) water stress protein kinases Malus hupehensis Rehd.