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Subject: Plant Physiology × Author: Soni, Aarti × End date: 2022 × Start date: 2022 × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Ethylene-induced evaluation of heat tolerance and stay-green trait in bread wheat
    (Chaudhary Charan Singh Haryana Agricultural University hisar, 2022-10) Soni, Aarti; Munjal, Renu
    The present study entitled ―Ethylene-induced evaluation of heat tolerance and stay-green trait in bread wheat‖ was conducted in three experiments. First experiment was conducted in the field of the wheat research area of the Department of Genetics & Plant Breeding with 30 wheat genotypes during rabi 2018-19 under late and very late environments. Second experiment was carried out with seedling of three genotypes (BWL 5391, HTW 64 and WH 1124) selected out of 30 genotypes based on their performance in fields along with source and inhibitor of ethylene, in the growth chamber at the Department of Botany and Plant Physiology, CCS HAU, Hisar during rabi 2019-20. Seedlings were studied for biochemical traits, including ROS, H2O2, protease, MDA, MTS, FRSA, chlorophyll, and proline. A third experiment was carried out applying AVG and ethrel with the same three genotypes at the net house of the Department of Botany and Plant Physiology, CCS HAU, Hisar during rabi 2019–20 under late and very late environments. SG characteristics such as Normalized Difference Vegetation Index (NDVI), SPAD Chlorophyll Meter Reading (SCMR), Leaf Senescence Rate (LSR), Chlorophyll Fluorescence and yield & its attributes were recorded in the field as well as in the nethouse. From the field experiment, genotypes were characterized into three categories viz slow senescing, intermediate slow senescing and fast senescing based on their rate of senescence. The results indicate that the slow senescing genotype had a significantly higher yield as compared to the fast-senescing genotype. Among 30 genotypes, BWL 5391, BWL 5179, BWL5233, BWL 5388 and BWL 5422 were the SG genotypes and also had higher grain yield. AVG treatment at the seedling stage was significantly more effective for providing tolerance to heat stress as indicated by high proline, FRSA, low MDA and ROS. Foliar spray of 2ppm AVG at 50% heading stage was found effective for increasing grain yield in WH 1124 under LS environment.