Effects of Heat Stress after Anthesis on PSII Photochemical Efficiency and the Antioxidant Activity of Wheat Cultivars

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dc.contributor.authorZmani, Mahroo Mojtabaie
dc.contributor.authorNabipour, Majid
dc.contributor.authorMeskarbashee, Mousa
dc.contributor.departmentZiraat Fakültesitr_TR
dc.date.accessioned2021-09-27T07:56:53Z
dc.date.available2021-09-27T07:56:53Z
dc.date.issued2018-03-31
dc.description.abstractThis study was conducted to investigate the effects of heat stress after anthesis on the performance of Photosystem II (PSII) and the enzymatic activity of catalase and ascorbate peroxidase. Two treatments-normal and heat stress-were conducted on four bread wheat cultivars from 7 days after anthesis until maturity. Heat stress led to an acceleration of chlorosis, reduced the efficiency of electron transfer and increased concentrations of malondialdehyde; however, the level of susceptibility varied depending on the cultivars. On the 10th day of heat stress, reductions in fluorescence parameters, depending on the cultivar, were 6.9 to 18.9% for Fv/Fm, 9 to 21% for ΦPSII and 8.3 to 19.4% for F’v/F’m compared to normal conditions. Catalase activity increased after initial exposure to heat stress. However, after 10 days of treatment, catalase activity increased in the Chamran and Aflak cultivars by 32% and 45%, respectively, but it did not change in the Dez cultivar and decreased 22% in Darab2. Ascorbate peroxidase activity decreased in two treatments, while the amount of reduction in heat stress treatment was more than the normal treatment. The highest levels of enzymatic activity were observed in Chamran under heat stress conditions, whereas Darab2 and Dez showed the lowest activity of the enzymes. Chlorophyll fluorescence parameters and chlorophyll index had a significant negative correlation with the levels of malondialdehyde; however, they had a significant positive correlation with the antioxidant activity.tr_TR
dc.identifier.endpage81tr_TR
dc.identifier.issn/e-issn2148-9297
dc.identifier.issue1tr_TR
dc.identifier.startpage72tr_TR
dc.identifier.urihttps://doi.org/10.15832/ankutbd.446391tr_TR
dc.identifier.urihttp://hdl.handle.net/20.500.12575/74909
dc.identifier.volume24tr_TR
dc.language.isoentr_TR
dc.publisherAnkara Üniversitesitr_TR
dc.relation.isversionof10.15832/ankutbd.446391tr_TR
dc.relation.journalTarım Bilimleri Dergisitr_TR
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıtr_TR
dc.subjectAscorbate peroxidasetr_TR
dc.subjectChlorophyll fluorescencetr_TR
dc.subjectCatalasetr_TR
dc.titleEffects of Heat Stress after Anthesis on PSII Photochemical Efficiency and the Antioxidant Activity of Wheat Cultivarstr_TR
dc.typeArticletr_TR

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Cilt:24 Sayı:01 (2018)