Role of Slow Elongation of Stem and Induction of Alcohol Dehydrogenase (Adh) Enzyme For Increment Of Survival Under Submergence Condition In Rice (Oryza sativa L.)

Abstract

Twenty diverse paddy genotypes were taken for the evaluation of role of reduced stem elongation and induction of alcohol dehydrogenase (Adh) enzyme on survival% under total inundation prior to vegetative stage of growth. Extensive shoot elongation is not desirable under flash flood condition. During pre vegetative stage stem elongation and survival is strongly negatively correlated under total submerged condition. Among the tolerant paddy genotypes alcohol dehydrogenase enzyme activity was much higher than that of susceptible genotype. The peak time of Adh enzyme synthesis was during seventy two hour to ninety six hours of submergence period. Mahananda performed very well in compare with the tolerant check paddy genotypes for better survival in related to all the characters under investigation. Manipulations of morpho-physico characters such as elongation% of stem along with high induction of Adh enzyme will be the major breeding objectives for submergence tolerance in rice.