International Journal of Chemical Studies
Vol. 5, Issue 6 (2017)
Screening and identification of rice genotypes with drought tolerance under stress and non-stress condition
Author(s): Himanshu Shekhar Garg, Rajesh Kumar, Binod Kumar and Akhilesh Kumar Singh
Abstract: Climate change needs us to look at various alternatives for more drought tolerant and tougher strains. Rice (Oryza sativa L.) is the most important food crop of the world; drought stress is a serious limiting factor to rice production and yield stability in rainfed areas. In order to design efficient varieties with virtues of drought tolerance and high yielding ability is necessary. A set of 33 rice genotypes including four checks viz., Sahbhagidhan, Vandana, Rasi and APO were evaluated under vegetative and reproductive stage, drought stress and normal conditions during kharif 2011-12 with objectives to estimate genetic variability, character association and path analysis for various traits to identify stress tolerant genotypes. Analysis of variance revealed highly significant variation among the genotypes for all the characters under study in both conditions (stress and normal). The effects of water deficit on various morpho-physiological traits associated with drought tolerance were also studied. Result revealed that significant yield decline was observed almost in all rice genotypes grown under water stress condition compared to normal irrigated situation. Out of these 33 rice genotypes, RAU-1428-31-5-4 (8.39*),RAU-1428-54-35-5-5 (8.38*) and 21284-BAU445-06 (8.38*) under stress condition, whereas under normal condition, the genotypes namely RAU-1428-31-5-4-3-2-2-2 (14.82*), RAU-1428-31-5-4 (14.31*) and RAU-1451-66-1-1-5-2 (13.69*) showed superior in terms of grain yield and yield attributes. Significant variation was also observed among the genotypes for drought susceptibility index, canopy temperature, relative water content, leaf rolling at vegetative stage, leaf drying at vegetative stage, chlorophyll content, days to fifty percent flowering, days to maturity, plant height and seed yield per plant under both stress and normal (irrigated) condition. The tolerant lines maintained high leaf water status and plant biomass under vegetative and reproductive stage drought condition. Based on yield and yield attributes results under drought and irrigated condition, rice genotypes RAU-1428-31-5-4 (8.39*), RAU-1428-54-35-5-5 (8.38*) and 21284-BAU445-06 (8.38*) under stress condition, whereas under normal condition, the genotypes namely RAU-1428-31-5-4-3-2-2-2 (14.82*), RAU-1428-31-5-4 (14.31*) and RAU-1451-66-1-1-5-2 (13.69*) were recommended for use in drought breeding programme as well as adoption in rainfed lowland ecosystem. The present study also indicates the agro-morphological and physiological traits that have direct and indirect effect on yield performance of rice genotypes under drought stress condition.
Pages: 1031-1042 | 537 Views 22 Downloads
How to cite this article:
Himanshu Shekhar Garg, Rajesh Kumar, Binod Kumar, Akhilesh Kumar Singh. Screening and identification of rice genotypes with drought tolerance under stress and non-stress condition. Int J Chem Stud 2017;5(6):1031-1042.