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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

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Ellagic Acid Enhances Antioxidant System Activity and Maintains the Quality of Strawberry Fruit during Storage

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Phyton-International Journal of Experimental Botany 2024年第1期93卷 15-28页

作者： Jian Chen Jing Zhang Gang Pan Dandan Huang Shuhua Zhu College of Chemistry and Material Science Shandong Agricultural UniversityTaian271018China Agriculture and Rural Bureau of Penglai District Yantai265699China Laiyang Inspection and Testing Center Yantai265299China

Ellagic acid(EA)is a natural antioxidant,widely present in a lot of forms’soft fruits,nuts,and other plant tissues,and helpful for promoting human health;however,its protective effect on postharvest fruit and improving the quality index of postharvest fruit have rarely been *** this experiment,the strawberries were soaked in 0,100,200,300,400,and 500 mg L^(−1) EA,respectively,and the influential EA on fruit quality and the antioxidant system of strawberries were *** with the control,EA treatment can reduce the browning degree and rotting rate of strawberry fruit during storage and augment the soluble solid content(SSC).EA treatment can also increase the content of related stuff and enzyme activity in antioxidant systems;the gene expression level of polyphenol oxidase(PPO)in strawberries treated with EA was always down-regulated,correspondingly,the expression of other antioxidant enzyme genes was *** the strawberry fruits treated with EA of different concentrations,300 mg L^(−1) EA had the best effect in the process of strawberry *** results suggested that the proper concentration of exogenous EA at 300 mg L−1 could maintain strawberries’quality and enhance the antioxidant system by improving the activities of antioxidative enzymes and the ascorbateglutathione(asa-gsh)cycle during storage.

关键词： Strawberry ellagic acid antioxidative enzyme asa-gsh cycle storage

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The role of antioxidant system in freezing acclimation-induced freezing resistance of Populus suaveolens cuttings

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Forestry Studies in China 2007年第2期9卷 107-113页

作者： Luo Lei Lin Shan-zhi Zheng Hui-quan Lei Yang Zhang Qian Zhang Zhi-yi Key Laboratory for Genetics and Breeding in Forest Trees and Ornamental Plants Ministry of Education Beijing Forestry UniversityBeijing 100083 P. R. China

We investigated the changes in the contents of H202, malonaldehyde （MDA） and endogenous antioxidants, the activities of protective enzymes and some critical enzymes involved in the ascorbate-glutathione （asa-gsh） cycle as well as freezing resistance （expressed as LT50） and correlations mentioned above, in detail using Populus suaveolens cuttings. The purpose was to explore the physiological mechanism of the enhancement of freezing resistance induced by freezing acclimation at -20℃, and to elucidate the physiological mechanisms by which trees adapt to freezing. The results showed that freezing acclimation enhanced the activities of superoxide dismutase （SOD）, peroxidase （POD）, catalase （CAT）, monodehydroascorbate reductase （MDAR）, ascorbate peroxidase （APX）, dehydroascorbate reductase （DHAR） and glutathione reductase （GR）. And it increased the contents of reduced ascorbate （asa）, reduced glutathione （gsh）, dehydroascorbate （DHA） and oxidized glutathione （GSSG）. However, H202 and MDA contents and LT50 of cuttings were decreased. LTs0 in cuttings was found to be closely correlated to the levels of SOD, POD, CAT, APX, DHAR, MDAR, GR, H202, MDA, asa, gsh, DHA and GSSG during freezing acclimation. This suggested that the enhancement of freezing resistance of cuttings induced by freezing acclimation may relate to the distinct increase for the levels of SOD, POD, CAT, APX, DHAR, MDAR, GR, asa, gsh, DHA, and GSSG. In addition, the observed levels of APX, DHAR, MDAR, GR, asa, DHA, gsh and GSSG were higher than those of SOD, POD and CAT during freezing acclimation. It indicated that a higher capacity of the asa-gsh cycle is required for H202 detoxification, and growth and development of cuttings. Based on the obtained results, it can be concluded that the asa-gsh cycle plays an important role in enhancement of freezing resistance of P. suaveolens cuttings during freezing acclimation.

关键词： Populus suaveolens freezing acclimation antioxidant system asa-gsh cycle

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Effect of Foliar GA_(3) and ABA Applications on Reactive Oxygen Metabolism in Black Currants (Ribes nigrum L.) During Bud Para-dormancy and Secondary Bud Burst

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Journal of Northeast Agricultural University(English Edition) 2021年第4期28卷 1-11页

作者： Huo Jun-wei Fei Xiao-hui Gang Hui-xin Zhang Yan Gong Xiao-nan Li Song-lin Bian Chun-yang Yu Gary-Gao Qin Dong College of Horticulture&Landscape Architecture Northeast Agricultural University/Key Laboratory of Biology and Genetic Improvement of Horticultural Crops(Northeast Region)Ministry of AgricultureHarbin 150030China OSU South Centers College of FoodAgricultural and Environmental SciencesThe Ohio State UniversityPiketonOhio 45661USA

The secondary bud burst can cause around 10%-20%yield losses in black currants,an economically important crop in parts of Europe,Asia and North *** metabolism of reactive oxygen species(ROS)has been linked to bud dormancy and its early release(secondary bud burst)in several fruit *** the relationship between ROS metabolism and the secondary bud burst is still not well understood in black *** the present study,two black currant cultivars(Adelinia and Heifeng)with opposing tendency of exhibiting the secondary bud burst were sprayed with abscisic acid(ABA)and gibberellic acid(GA_(3))to either inhibit or induce the secondary bud *** results showed that ABA inhibited the secondary bud burst by reducing the contents of ROS(H_(2)O_(2),O_(2)-·)in buds;decreasing the activities of superoxide dismutase(SOD),peroxidase(POD)and catalase(CAT);and increasing the contents of oxidized glutathione(GSSG)and ascorbic acid(asa).GA_(3) effectively induced the secondary bud burst by increasing ROS contents;increasing the activities of several antioxidant enzymes,such as SOD,POD,CAT,glutathione reductase(GR),ascorbate peroxidase(APX)and the contents of reduced glutathione(gsh);and decreasing the contents of *** experimental results showed that GA_(3) treatment increased the content of ROS,accelerated the metabolism of reactive oxygen species,and promoted the second burst of black ***,ROS metabolism was at a low level under ABA treatment,and the buds remained *** results suggested that ROS metabolism might play an important role in the two black currants of the secondary bud burst.

关键词： Adelinia and Heifeng asa-gsh cycle concentration reactive oxygen species(ROS) enzyme activity

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