Archana H.R., Dunna Vijay, Manjunath Prasad C.T., Akash A. and Sushmitha L.C
Abstract
High temperature has adverse effects on rice seed seedling establishment. Priming is one of the easiest methods to alleviate heat stress. Spermidine is a polyamine that effectively reduces several abiotic stresses, including heat stress. A study was conducted for the spermidine seed priming to alleviate heat stress during the radicle stage of rice. The seeds were primed with three different concentrations of spermidine (0.5 mM, 1 mM and 1.5 mM), using three different methods of imbibition (direct soaking, blotter method, polyethylene glycol (PEG) method) before subjecting them to heat stress at the radicle stage. Results showed enhanced survival percentage with 1 mM spermidine priming in all the three methods of imbibition. In conclusion, seed priming with 1 mM spermidine concentration can effectively alleviate the adverse consequences of high temperature at the radicle stage and help in the development of normal seedlings.