Influence of spermidine priming on rice (Oryza sativa) seed germinability and vigour under heat stress oleh H R ARCHANA, DUNNA VIJAY, MANJUNATH PRASAD C T, DILSHAD AHMAD, ARUN KUMAR M B, PROLAY KUMAR BHOWMICK, SUBODH KUMAR SINHA, D K SHARMA, L C SUSHMITHA