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中国植物学会第十六次全国会员代表大会暨85周年学术年会

作者： Shuangzhan Huang Ai Zhang Jing Bo Jin Bo Zhao Tianjing Wang Yutong Liu Jie Wang Xiaoming Yu Rafiq Ahmad Bao Liu Zhengyi Xu Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE) Northeast Normal University Key Laboratory of Molecular Physiology Institute of Botanythe Chinese Academy of Sciences Institute for Cellular and Molecular Biology The University of Texas at Austin Department of Molecular Biosciences The University of Texas at Austin

Drought is currently a major constraint for crop *** H3 lysine 4（H3 K4） methylation plays essential roles in transcriptional regulation under dehydration stress in ***,the specific histone demethylase modulating histone methylation homeostasis under dehydration stress remains ***,we document that the evolutionarily conserved histone demethylase,JMJ17,belonging to the KDM5/JARID1 family,plays essential roles in dehydration stress and abscisic acid（ABA） responses in Arabidopsis ***17 loss-of-function mutants display dehydration stress tolerance and ABA hypersensitive ***17 specifically demethylates H3 K4 me1/2/3 in vitro and in *** in JMJ17 causes ectopic increased H3 K4 me3 level and induced mRNA expression of a plethora of genes involved in the dehydration stress *** interaction tests reveal that a mutation of OPEN STOMATA 1（OST1） or ABA INSENSITIVE 5（ABI5） suppresses dehydration stress tolerance and ABA-hypersensitive phenotypes in terms of stomatal closure,seed germination or seedling growth of the jmj17 mutant,demonstrating that they both act genetically downstream of *** further show that JMJ17 directly associates with these genetic loci and modulates their H3 K4 me3 *** findings unravel a novel molecular function of the JmjC domain-containing histone demethylase,JMJ17,in plant dehydration stress and ABA responses.

关键词： abiotic stress dehydration stress abscisic acid transcriptional regulation histone demethylation Arabidopsis thaliana

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Discrepancy in photosynthetic responses of the red alga Pyropia yezoensis to dehydration stresses under exposure to desiccation,high salinity,and high mannitol concentration

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Marine Life Science & Technology 2022年第1期4卷 10-17页

作者： Guoying Du Xiaojiao Li Junhao Wang Shuai Che Xuefeng Zhong Yunxiang Mao Key Laboratory of Marine Genetics and Breeding(Ministry of Education) College of Marine Life SciencesOcean University of ChinaQingdao266003China Qingdao West Coast New Area Marine Development Bureau Qingdao266003China Key Laboratory of Utilization and Conservation of Tropical Marine Bioresource(Ministry of Education) College of Fisheries and Life ScienceHainan Tropical Ocean UniversitySanya572022China

Macroalgae that inhabit intertidal zones are exposed to the air for several hours during low tide and must endure desiccation and high variations in temperature, light intensity, and salinity. Pyropia yezoensis (Rhodophyta, Bangiales), a typical intertidal red macroalga that is commercially cultivated in the northwestern Pacific Ocean, was investigated under different dehydration stresses of desiccation, high salinity, and high mannitol concentration. Using chlorophyll fluorescence imaging, photosynthetic activities of P. yezoensis thalli were analyzed using six parameters derived from quenching curves and rapid light curves. A distinct discrepancy was revealed in photosynthetic responses to different dehydration stresses. dehydration caused by exposure to air resulted in rapid decreases in photosynthetic activities, which were always lower than two other stresses at the same water loss (WL) level. High salinity only reduced photosynthesis significantly at its maximum WL of 40% but maintained a relatively stable maximum quantum yield of photosystem II (PSII) (Fv/Fm). High mannitol concentration induced maximum WL of 20% for a longer time (60 min) than the other two treatments and caused no adverse influences on the six parameters at different WL except for a significant decrease in non-photochemical quenching (NPQ) at 20% WL. Illustrated by chlorophyll fluorescence images, severe spatial heterogeneities were induced by desiccation with lower values in the upper parts than the middle or basal parts of the thalli. The NPQ and rETRmax (maximum relative electron transport rate) demonstrated clear distinctions for evaluating photosynthetic responses, indicating their sensitivity and applicability. The findings of this study indicated that the natural dehydration of exposure to air results in stronger and more heterogeneous effects than those of high salinity or high mannitol concentration.

关键词： dehydration stress Desiccation High salinity High mannitol concentration Photosynthetic activities Pyropia yezoensis

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