Evaluation of groundnut (Arachis hypogaea L.) genotypes for temperature tolerance based on Temperature Induction Response (TIR) technique

Abstract

Thirty-two selected groundnut (Arachis hypogaea L.) genotypes were evaluated for temperature tolerance employing a new technique called Temperature Induction Response (TIR) technique, where two days old seedlings were exposed to gradual increase of temperature from 35° to 55°C for a specific time and finally subjected to the lethal temperature. The genotypes showing maximum survivability at 55°C and growth were considered to be temperature tolerant and those, which showed less or no survivability and recovery growth were considered to be temperature susceptible. The results of this study revealed a significant genetic variability among the genotypes for temperature tolerance. By using this technique, genotypes like K-134, K-1240, TNAU-325, JL-24 were identified as temperature tolerant and AK-159, VG-9711, TNAU-284.,and JSSP-15 as temperature susceptible genotypes.