Unravelling the photosynthetic dynamics and fluorescence parameters under ameliorative effects of 24-epibrassinolide in wheat (Triticum aestivum L.) grown under heat stress regime

被引：0
作者：
Jat, Manju [1 ]
Ray, Madhurya [1 ]
Ahmad, Md Afjal [1 ]
Prakash, Pravin [1 ]
机构：
[1] Banaras Hindu Univ BHU, Inst Agr Sci, Dept Plant Physiol, Varanasi 221005, Uttar Pradesh, India
来源：
SCIENTIFIC REPORTS | 2024年 / 14卷 / 01期
关键词：
CHLOROPHYLL FLUORESCENCE; PHOTOSYSTEM-II; EXOGENOUS APPLICATION; FOLIAR APPLICATION; WINTER-WHEAT; GAS-EXCHANGE; DURUM-WHEAT; TEMPERATURE; TOLERANCE; BRASSINOSTEROIDS;
D O I：
10.1038/s41598-024-79676-6
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
An experiment was performed at the Banaras Hindu University, India to study the effect of terminal heat stress on photosynthetic dynamics and fluorescence parameters of wheat genotypes and ameliorative effects of epibrassinolide by taking two genotypes with four concentrations as foliar spray at two growth stages of wheat. The highest values were observed in plots foliar sprayed with 1.0 mu M 24-epibrassinolide (T1) under normal conditions (D1) where the genotype Sonalika (V1) performed significantly well w.r.t. the parameters viz. steady-state fluorescence (Fs) 116.22, quantum efficiency of PSII 0.59, maximum fluorescence (Fm) 776.5, normalized stress detection ratio (Fv/Fo) 4.47, maximum potential quantum efficiency of PSII (Fv/Fm) 0.82.Whereas under heat stress condition (late sown D2), there was significant reduction in these parameters in both the genotypes which was improved by the application of epibrassinolide suggesting its potential role in improving the photoinhibition process by raising the efficiency of PSII. Overall, the calibrated application of 24-epibrassinolide was found to be a potent growth regulator involved in the positive modulation of heat stress tolerance in wheat, coupled with improved photosynthetic efficiency in treated plots as compared to control.
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页数：14
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