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Effect of high light and desiccation on photosystem Ⅱ in the seedlings and mature plants of tropical seagrass Enhalus acoroides during low tide

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Journal of Oceanology and Limnology 2023年第1期41卷 241-250页

作者： Xingkai CHE Hu LI Litao ZHANG Jianguo LIU CAS and Shandong Key Laboratory of Experimental Marine Biology Center for Ocean Mega-ScienceInstitute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Biology and Biotechnology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

During low tide,the intertidal seagrass Enhalus acoroides is often exposed to high light and desiccation,which can seriously threaten its survival,at least partly by inhibiting photosystem Ⅱ(PSⅡ)activity.The response of leaves of E.acoroides to high light and desiccation was compared for seedlings and mature plants.Results show that the resistance of seedling and mature leaves to high light was quite similar,but to desiccation was very different.Seedling leaves were more sensitive to desiccation than the mature plant leaves,but had better water retention.The damage of desiccation to seedling leaves was mainly caused by dehydration,whereas that to mature plant leaves was caused by hypersaline toxicity.The recovery rate of PSⅡ of seedling leaves was significantly slower than that of the mature plants after the stresses disappeared,which may at least partly contribute to seedling mortality in the wild.In addition,compared to high light,desiccation seriously inhibited the recovery rate of PSⅡ activities even if the leaves became fully rehydrated to their normal relative water content(RWC)in the following re-immersion.Desiccation inhibited the recovery rate of RC/CS_(M)(reaction center per cross section(at t=t_(Fm)))to decrease the production of assimilatory power,which maybe the cause of the slower PSⅡ recovery in desiccation treatments.This study demonstrates that desiccation particularly coupling with high light have a very negative ef fect on the PSⅡ of E.acoroides during low tide and the sensitivity of seedlings and mature plants to desiccation is significantly different,which have important reference significance to choose an appropriate transplanting depth where seedlings and mature plants of E.acoroides not only receive sufficient light for growth,but also that minimize desiccation stress during low tide.

关键词： Enhalus acoroides high light desiccation photosystemⅡ

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Identification of Green-Revertible Yellow 3(GRY3),encoding a 4-hydroxy-3-methylbut-2-enyl diphosphate reductase involved in chlorophyll synthesis under high temperature and high light in rice

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The Crop Journal 2023年第4期11卷 1171-1180页

作者： Hongzhen Jiang Anpeng Zhang Banpu Ruan Haitao Hu Rui Guo Jingguang Chen Qian Qian Zhenyu Gao China National Rice Research Institute Chinese Academy of Agricultural SciencesHangzhou 310006ZhejiangChina School of Agriculture Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107GuangdongChina Institute of Crop Breeding and Cultivation Shanghai Academy of Agricultural SciencesShanghai 201403China College of Life and Environmental Sciences Hangzhou Normal UniversityHangzhou 311121ZhejiangChina

Chlorophyll,a green pigment in photosynthetic organisms,is generated by two distinct biochemical pathways,the tetrapyrrole biosynthetic pathway(TBP) and the methylerythritol 4-phosphate(MEP)pathway.MEP is one of the pathways for isoprenoid synthesis in plants,with 4-hydroxy-3-methylbut-2-enyl diphosphate reductase(HDR) catalyzing its last step.In this study,we isolated a greenrevertible yellow leaf mutant gry3 in rice and cloned the GRY3 gene,which encodes a HDR participating in geranylgeranyl diphosphate(GGPP) biosynthesis in chloroplast.A complementation experiment confirmed that a missense mutation(C to T) in the fourth exon of LOC_Os03g52170 causes the gry3 phenotype.Under high temperature and high light,transcript and protein abundances of GRY3 were reduced in the gry3 mutant.Transcriptional expression of chlorophyll biosynthesis,chloroplast development,and genes involved in photosynthesis were also affected.Excessive reactive oxygen species accumulation,cell death,and photosynthetic proteins degradation were occurred in the mutant.The content of GGPP was reduced in gry3 compared with Nipponbare,resulting in a stoichiometric imbalance of tetrapyrrolic chlorophyll precursors.These results shed light on the response of chloroplast biogenesis and maintenance in plants to high-temperature and high-light stress.

关键词： Chloroplast high temperature high light Rice

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Triose phosphate export from chloroplasts and cellular sugar content regulate anthocyanin biosynthesis during high light acclimation

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Plant Communications 2023年第1期4卷 42-61页

作者： Max-Emanuel Zirngibl Galileo Estopare Araguirang Anastasia Kitashova Kathrin Jahnke Tobias Rolka Christine Kühn Thomas Nägele Andreas S.Richter University of Rostock Institute for BiosciencesPhysiology of Plant MetabolismAlbert-Einstein-Strasse 318059 RostockGermany Humboldt-Universit€at zu Berlin Institute of BiologyPhysiology of Plant Cell OrganellesPhilippstrasse 1310115 BerlinGermany Ludwig-Maximilians-Universit€at M€unchen Faculty of BiologyPlant Evolutionary Cell Biology82152 Planegg-MartinsriedGermany

Plants have evolvedmultiple strategies to cope with rapid changes in the environment.During high light(HL)acclimation,the biosynthesis of photoprotective flavonoids,such as anthocyanins,is induced.However,the exact nature of the signal and downstreamfactors forHL induction of flavonoid biosynthesis(FB)is still under debate.Here,we show that carbon fixation in chloroplasts,subsequent export of photosynthates by triose phosphate/phosphate translocator(TPT),and rapid increase in cellular sugar content permit the transcriptional and metabolic activation of anthocyanin biosynthesis during HL acclimation.In combination with genetic and physiological analysis,targeted and whole-transcriptome gene expression studies suggest that reactive oxygen species and phytohormones play only a minor role in rapid HL induction of the anthocyanin branch of FB.In addition to transcripts of FB,sugar-responsive genes showed delayed repression or induction in tpt-2 during HL treatment,and a significant overlapwith transcripts regulated by SNF1-related protein kinase 1(SnRK1)was observed,including a central transcription factor of FB.Analysis of mutants with increased and repressed SnRK1 activity suggests that sugar-induced inactivation of SnRK1 is required for HL-mediated activation of anthocyanin biosynthesis.Our study emphasizes the central role of chloroplasts as sensors for environmental changes as well as the vital function of sugar signaling in plant acclimation.

关键词： flavonoid biosynthesis acclimation sugar signaling high light anthocyanin SnRK1

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Genetic analysis of tolerance to photo-oxidative stress induced by high light in winter wheat (Triticum aestivum L.)

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Journal of Genetics and Genomics 2010年第6期37卷 399-412页

作者： Hongwei Li Yiping Tong Bin Li Ruilian Jing Congming Lu Zhensheng Li State Key Laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing 100101 China Institute of Crop Sciences Chinese Academy of Agricultural Sciences Beijing 100081 China Key Laboratory of Photosynthesis and Environmental Molecular Physiology Photosynthesis Research Center Institute of Botany Chinese Academy of Sciences Beijing 100093 China

high light induced photooxidation （HLIP） usually leads to leaf premature senescence and causes great yield loss in winter wheat. In order to explore the genetic control of wheat tolerance to HLIP stress, a quantitative trait loci （QTL） analysis was conducted on a set of doubled haploid population, derived from two winter wheat cultivars. Actual values of chlorophyll content （Chl）, minimum fluorescence level （Fo）, maximum fluorescence level （Fm）, and the maximum quan^m efficiency of photosystem II （Fv/Fm） under both HLIP and non-stress conditions as well as the ratios of HLIP to non-stress were evaluated. HLIP considerably reduced Chl, Fm, and Fv/Fm, but in- creased Fo, compared with that under non-stress condition. A total of 27, 16, and 28 QTLs were associated with the investigated traits under HLIP and non-stress and the ratios of HLIP to non-stress, respectively. Most of the QTLs for the ratios of HLIP to non-stress collocated or nearly linked with those detected under HLIP condition. HLIP-induced QTLs were mapped on 15 chromosomes, involving in 1A, 1B, 1D, 2A, 2B, 2D, 3A, 3B, 4A, 4D, 5B, 6A, 6B, 7A, and 7D while those expressed under non-stress condition involved in nine chromosomes, includ- ing 1B, 1D, 2A, 2B, 3B, 4A, 5A, 5B, and 7A. The expression patterns of QTLs under HLIP condition were different from that under non-stress condition except for six loci on five chromosomes. The phenotypic variance explained by individual QTL ranged from 5.0% to 19.7% under HLIP, 8.3% to 20.8% under non-stress, and 4.9% to 20.2% for the ratios of HLIP to non-stress, respectively. Some markers, for example, Xgwm192 and WMC331 on 4D regulating Chl, Fo, Fm, and Fv/Fm under HLIP condition, might be used in marker assistant selection.

关键词： Triticum aestivum photooxidation high light chlorophyll content chlorophyll fluorescence grain filling QTL

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Different B-Type Methionine Sulfoxide Reductases in Chlamydomonas May Protect the Alga against high-light, Sulfur-Depletion, or Oxidative Stress

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Journal of Integrative Plant Biology 2013年第11期55卷 1054-1068页

作者： Lei Zhao Mei Chen Dongmei Cheng Haomeng Yang Yongle Sun Heyi Zhou Fang Huang Key Laboratory of Photobiology Institute of Botany the Chinese Academy of Sciences University of Chinese Academy of Sciences

The genome of unicellular green alga Chlamydomonas reinhardtii contains four genes encoding B-type methionine sulfoxide reductases, MSRBI.1, MSRB1.2, MSRB2.1, and MSRB2.2, with functions largely unknown. To understand the cell defense system mediated by the methionine suifoxide reductases in Chlamydomonas, we analyzed expression and physiological roles of the MSRBs under different abiotic stress conditions using immunoblotting and quantitative polymerase chain reaction （PCR） analyses. We showed that the MSRB2.2 protein was accumulated in cells treated with high light （1,300 μE-/m2 per s）, whereas MSRBI.1 was accumulated in the cells under 1 mmol/L H2O2 treatment or sulfur depletion. We observed that the cells with the MSRB2.2 knockdown and overexpression displayed increased and decreased sensitivity to high light, respectively, based on in situ chlorophyll a fluorescence measures. We also observed that the cells with the MSRBI.1 knockdown and overexpression displayed decreased and increased tolerance to sulfur-depletion and oxidative stresses, respectively, based on growth and H2- producing performance. The physiological implications revealed from the experimental data highlight the importance of MSRB2.2 and MSRBI.1 in protecting Chlamydomonas cells against adverse conditions such as high-light, sulfur-depletion, and oxidative stresses.

关键词： Chlamydomonas high light MSRB oxidative stress sulfur deprivation.

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Plants response to light stress

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Journal of Genetics and Genomics 2022年第8期49卷 735-747页

作者： Yafei Shi Xiangsheng Ke Xiaoxia Yang Yuhan Liu Xin Hou State Key Laboratory of Hybrid Rice Hubei Hongshan LaboratoryCollege of Life SciencesWuhan UniversityWuhanHubei 430072China

Plants require solar energy to grow through oxygenic photosynthesis;however,when light intensity exceeds the optimal range for photosynthesis,it causes abiotic stress and physiological damage in plants.In response to high light stress,plants initiate a series of signal transduction from chloroplasts to whole cells and from locally stressed tissues to the rest of the plant body.These signals trigger a variety of physiological and biochemical reactions intended to mitigate the deleterious effects of high light intensity,such as photodamage and photoinhibition.light stress protection mechanisms include chloroplastic Reactive oxygen species(ROS)scavenging,chloroplast and stomatal movement,and anthocyanin production.Photosynthetic apparatuses,being the direct targets of photodamage,have also developed various acclimation processes such as thermal energy dissipation through nonphotochemical quenching(NPQ),photorepair of Photosystem II(PSII),and transcriptional regulation of photosynthetic proteins.Fluctuating light is another mild but persistent type of light stress in nature,which unfortunately has been poorly investigated.Current studies,however,suggest that state transitions and cyclic electron transport are the main adaptive mechanisms for mediating fiuctuating light stress in plants.Here,we review the current breadth of knowledge regarding physiological and biochemical responses to both high light stress and fiuctuating light stress.

关键词： Photosynthesis light stress Photorepair high light Fluctuating light

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high light

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当代体育(扣篮) 2016年第23期 117+1-3页

看看伊萨亚·托马斯,身高只有1,75米的他却敢于在天赋异禀的威金斯面前一试身手。11月22日,凯尔特人客场99比93小胜森林狼,取得赛季第四个客场胜利。是役,小托马斯出战32分钟,20投9中,砍下全场最高的29分。而森林狼现任主帅锡伯杜,他的... 详细信息

看看伊萨亚·托马斯,身高只有1,75米的他却敢于在天赋异禀的威金斯面前一试身手。11月22日,凯尔特人客场99比93小胜森林狼,取得赛季第四个客场胜利。是役,小托马斯出战32分钟,20投9中,砍下全场最高的29分。而森林狼现任主帅锡伯杜,他的前任东家公牛一天后同样输了球。西征第五场,作客丹佛百事中心,公牛以3分之差(107比110)不敌掘金。但比赛中,罗宾·洛佩兹送给约基奇的这记大帽,绝对堪称精彩。

关键词：森林狼凯尔特人 high light

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Cloning and Characterization of a high light-Inducible Polypeptide from Porphyra yezoensis

Cloning and Characterization of a High Light-Inducible Polyp...

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中国海洋湖沼学会藻类学分会第七届会员大会暨第十四次学术...

作者： Fanna Kong Shanshan Zhang Hui Yang Yunxiang Mao~*(College of Marine Life Sciences,Ocean University of China 266003,China)

＜正＞Porphyra yezoensis Ueda grows intertidal zone and is one of the most important seaweeds.The intertidal zone is one of the harshest environments on earth and the intertidal zone algae are frequently exposed to high temperature,high light and osmotic pressure between tidal up and down.During the long evolution,P. yezoensis have evolved mechanisms for photo-acclimation that favor survival in high light（HL）.And high light-inducible polypeptide（HLIP）is one of the light resistant mechanisms.In this paper,we reported the HLIP gene.infonnation and expression analysis from P.yezoensis.Sequence analysis indicates that it contains an ORF of 387 bp without intron encoding a polypeptide of 128 amino acids with similarity to HliC from Synechocystis PCC6803.HLIP of P.yezoensis has a molecular mass of 13 kDa and have a theoretical pI of 11.23.The PHDhtm program clearly predicted a membrane-spanning-helix between 54-83 sites which is the conservation motif of light-harvesting chlorophyll a/b-binding（LHC）proteins.RT-PCR analysis shows the high light induces expression of HLIP and under low high light no expression.In addition,the lengtj of exposed to high light affected the expression of HLIP.

关键词： Porphyra yezoensis Ueda high light high light-inducible polypeptide（HLIP） light-harvesting chlorophyll a/b-binding （LHC） proteins

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CITP is essential for efficient oxygen evolution in high light acclimation via affecting iron in Synechocystis sp.PCC6803

CITP is essential for efficient oxygen evolution in high lig...

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第七届长三角植物科学研讨会暨青年学术报告会

作者： Xiao Han Yuanyuan Jiang Weimin Ma College of Life and Environment Sciences Shanghai Normal University

As the rapid changing in light climate,from low light(LL) to relative high light(HL) could induce photoinhibition,and Fe-S clusters mostly are destroyed by excess reactive oxygen species.The protective mechanisms to deal with high light exposure remaining unsolved.Here,we isolated two mutants that were sensitive to change from LL to HL through a tagging library of Synechocystis sp.strain PCC 6803.Both mutants had a tag in cyanobacteria iron transport protein(citp) gene,and deletion of city exhibited significantly decreased the efficient oxygen evolution.BN-PAGE followed by immunoblotting analyses of the whole photosynthetic complexes accumulation between wide type and Δcitp mutant under different light condition,indicated that abscence of CITP destabilized photosynthetic complexes,especially for PSI.This finding is consistent with that CITP deficiency reduced electron transport capacity through photosynthetic electron transport chain during HL acclimation.We further analyse celluar iron content by flame atomic absorption spectrophotometer,deletion of citp could not supply enough iron when exposing to HL.Based on the above results,we conclude that CITP could maintain efficient oxygen evolution in high light by depending on iron concentration.Furthermore,we consider that the function of CITP was conserved in phototrophs,they all could transport large amounts of iron for acclimating increased light intensity.

关键词： CITP high light iron oxygen evolution photosynthetic complexes

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Study on Kinetics of light-intensity adaptation of Dicrateria inornata.

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Acta Oceanologica Sinica 1994年第2期13卷 237-242页

作者： Wang Xian and Li Wenquan

light-saturation curves of Dicrateria inornata at various temperatures were determined by using 14C-la belling technique. Kinetics of light-intensity adapation was also analyzed in combination with Chl.a determination and cell enumeration measurements. The response of cellular Chl. a in light transition processes can be appoximately described with the first order kinetic model. The model between temperature and maximum growth rate was established by using the Arrhenius equation.

关键词： high light low light light-saturation cruve Dicrateria inornata

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