Differential response of Indian mustard (Brassica juncea L. Czern & Coss) genotypes under rainfed and irrigated conditions
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Date
2020
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Punjab Agricultural University, Ludhiana
Abstract
The present investigation was carried out to assess the differential response of Brassica juncea genotypes under rainfed and irrigated conditions. Only pre-sowing irrigation, referred as rainfed (I0) and two irrigations (35 and 65 DAS), referred as irrigated (I2) module. Durations of flowering and siliquing along with reproductive phase were shorter under rainfed/stressed condition. Physiological parameters like SPAD value, photosynthetic pigments, leaf area, specific leaf area and specific leaf weight declined significantly due to moisture stress. Decline in RWC was 9.0%, LWR 11.4%, membrane stability 25.3% however, RSD, WSD, membrane injury and MDA increased by 21.6%, 24.4%, 10.3% and 7.9% respectively under moisture stress. Catalase, superoxide dismutase and peroxidase activity increased imparting protection under stress. Osmoprotectants particularly TSS (29.3%), RS (53.8%) and proline (23.7%) increased to appreciable extent. Genotypes suffered decline in growth parameters, yield components and seed yield due to moisture stress as compared to non-stressed/irrigated condition. However, variation existed within genotypes for different studied traits. Banding pattern for protein by SDS-PAGE showed similar protein bands in PBR 422 under moisture stress and irrigated module. Negative correlation existed between DTE and DSI for biomass (r= -0.857**) and seed yield (r= -0.999**), however positive association existed between DTE and DTI for biomass (r= 0.791**) and seed yield (r= 0.679*). Seed yield was positively associated with initiation and completion of flowering, LA, leaf width, LWR, plant height, seed size, BY and HI. Drought resistant parameters and lesser yield reduction identified RB-50, RH 406, PBR 422, CSR 1163 and PBR 357 as promising genotypes.