Effects of anti Gibberellic and Ethylene Substances for Submergence Tolerance in Rice (Oryza Sativa L.)

摘要

10 days old rice seedlings of three rice genotypes viz. FR13A, Mahananda and Swarna were sprayed with 10-Molar/Lt solution of gibberellic acid (GA3) retardant paclobutrazol and stress hormone abscisic acid (ABA), gibberellic acid (GA3) and ethylene inhibitor substances like STS solution of concentration 0.02Molar, 20-Molar, 0.6 mili Molar; 10 -Molar CoCl2 and 240ppm AgNO3 solution on the leaves prior to two days of submergence under drum and pot screening method in each separate set up in three replications. Gibberellin and ethylene inhibitors reduce the stem elongation and increases survival% after complete four days full submergence. The important genetic variability components viz. CV, GCV, PCV, h%, GA and GA% of mean were estimated for different agro morphological characters after treatment effect. Manipulation of gibberellic acid and ethylene action are very important for breeding submergence tolerance in rice. Less difference of GCV and PCV along with high heritability and genetic gain of the characters indicate that they are controlled by additive genes and selection based on the characters will be effective for breeding submergence tolerance in rice.