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20211
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Subject: Plant Physiology × Author: Maurya, Kalpana × End date: 2021 × Start date: 2021 × Type: Thesis ×
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    ThesisItemOpen Access
    Elucidation of the tolerance mechanism of different genotypes of rice (Oryza sativa L.) for drought, salinity and submergence stress
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2021-02) Maurya, Kalpana; Atul Kumar
    Rice (Oryza sativa L.) is a staple food for more than half of the world’s population. A major environmental factor that limits growth and yield of rice is abiotic stress. This problem has become more and more serious as multiple stresses such as drought, salinity and submergence often occur simultaneously due to global climate changes. The present investigation was conducted in laboratory, fields and pot experiment in the rainy seasons, 2014 and 2015 at the G.B. Pant University of Agriculture and Technology, Pantnagar in fifteen rice genotypes namely, IET 24093, IET 24098, IET 24099, IET 24100, IET 24102, IET 24103, IET 24104, IET 24111, PHY 4, PHY 5, PHY 6, PHY 7, PHY 8, AC 39416 A, SM 686 were used in the study. In laboratory experiments, the effect of drought, salinity and submergence stresses on seed germination and seedling growth was evaluated. A field experiment was also conducted to evaluate the field performance of rice genotypes. Further a pot experiment was conducted to study the effect of drought stress on growth, yield, morphological and biochemical parameters of rice genotypes. Studies under laboratory condition revealed that shoot length, root length and seedling vigour of all the rice genotypes decreases under drought salinity and submergence stress. Among the genotypes AC 39416A, SM 686, PHY 8 were tolerant to drought salinity and submergence. Field experiment revealed that genotype PHY 7, PHY 8, AC 39416A performed best in terms of grain yield while IET 24093 recorded lower grain yield. A pot experiment revealed AC 39416A genotype tolerant while IET 24098 susceptible in terms of morphological, physiological and biochemical parameter i.e. grain yield, seedling vigour, more proline accumulation, lipid peroxidation and super oxide dismutase activity. Overall results revealed that these genotypes have tolerance mechanism due to their genotypic differences in the rice genotypes.