Abstract
Moisture deficit stress or drought is one of the persistent challenges for the survival of the rice plants to maintain its proper growth and productivity. Drought can occur at any stage of growth and development of rice. In response to the drought stress, various physiological and biochemical alterations have been employed by plant to cope up its adverse effects. Two contrasting rice varieties, Nagina22 (drought resistant) and IR64 (drought sensitive) were studied at 3 stages i.e. seedling, vegetative and reproductive stage under well watered (control) and moisture deficit stress conditions. This present study focuses at identifying changes in physiological and biochemical parameters between Nagina22 and IR64. The mean values of Relative Water Content (RWC), Membrane Stability Index (MSI), Chlorophyll a, Chlorophyll b, and Total chlorophyll decreases significantly during drought stress at different stages. But Proline showed remarkable increase during drought stress at reproductive stage in Nagina22 as compared to IR64. So we conclude that nagina22 is highly tolerant to drought stress than IR64 at reproductive stage.
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