Author(s):

Deepika Kumar Umesh and Madan Pal

Abstract: The present study was conducted to understand the role of JA under drought and heat stress in rice during anthesis. Four contrasting rice genotypes namely N-22, N-L-44, Swarna and PS-5, were raised under normal environment and exposed to drought and heat stress at anthesis. Important physiological and biochemical traits like relative water content: RWC, membrane stability index: MSI, lipid peroxidation, H2O2 content and antioxidant enzyme activity (superoxide dismutase: SOD) were estimated in all the four genotypes along with endogenous level of JA and other important yield attributes. Tolerant genotypes (N-22 and N-L-44) recorded higher endogenous level of JA under drought stress and at the same time shown better RWC, MSI and SOD activity and encountered lower oxidative stress (H2O2 content) and lipid peroxidation. But, JA levels did not differed much under heat stress conditions and neither brought any amelioration effect in any of the above mentioned traits. Our, results clearly indicates that JA plays differential role under drought and heat stress in rice.

Pages: 2626-2631  |  1655 Views  386 Downloads

Download (526KB)