SCREENING OF ELITE GREENGRAM LINES FOR DROUGHT TOLERANCE UNDER RABI CONDITION
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Date
2019-07-30
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UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR – 584 104
Abstract
The present investigation was conducted at ARS, Kalaburgi, University of Agricultural Sciences, Raichur, during the rabi 2018-19. Among two experiments conducted, the first experiment was laid out in split plot design which consists of eight genotypes sown in the field under stress and non stress condition to evaluate morpho-physiological, biochemical and yield parameters, whereas second experiment was conducted for root characterization study of same genotypes in PVC pipes. The effects between stress and genotypes and growth behavior was studied during 20 DAS, 40 DAS, 60 DAS and harvest stage. Significant changes in the plant height, biomass, growth parameters and root traits under both stress and non-stress condition were recorded, indicating the effect of moisture stress on plant. Among the genotypes, TRCRM-141 shows significantly higher plant height, growth parameters such as SLW, CGR, LA and also proline content (5.59 μ mole g-1 fresh wt.), relative water content (76.9%) and least values were recorded in Selection-4 and BGS-9 (check) (4.02 and 4.74 μ mole g-1 fresh wt., 62.9 and 68.2%, respectively) under both stress and non stress conditions. Under both stress and non-stress condition higher yield parameters such as number of pods per plant, seed yield and harvest index were recorded in TRCRM-141 (14, 1456 kg ha-1 and 33.89%) compared to Selection-4 and BGS-9 (check) (7 and 10, 817 and 916 kg ha -1, 26.4 and 30.4%, respectively). Drought tolerance indices including SSI, YI, YSI, DI and SSPI were calculated based on seed yield under stress (Ys) and non stress (Yp) conditions. Among the genotype, higher YI, YSI and DI and lower SSI and SSPI were recorded in TRCRM-141. Correlation analysis showed significant positive correlation between drought tolerant indices for traits. Genotypes showing higher amount proline content, relative water content, total chlorophyll content along with deeper root length are attributed for the drought tolerance
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