Temperature induction response reveals intrinsic thermotolerant genotypes in soybean

Uwimana Marie Ange,P Boominathan,S Srividhya,C Vijayalakshmi

doi:10.18805/lr.v0iof.9595

Abstract

The responses of soybean genotypes to high temperature for intrinsic tolerance was studied using Temperature Induction Response (TIR) technique in order identify the genotypes tolerant to high temperature stress. Seven soybean genotypes subjected to lethal and sub lethal temperatures showed significant variation for acquired thermotolerance. Thermotolerant genotypes ADT 1 and CoSoy1 identified by the TIR technique, demonstrated higher survival percentage, and lower growth reduction. Further the tolerant genotypes identified based on TIR also showed higher antioxidant enzymes activity implying the critical role of antioxidant in cellular thermotolerance. This clearly demonstrated that TIR can be effectively used for screening high temperature tolerance genotypes in soybean. This study also established the fact that the alternations in antioxidants during induction are vital for imparting tolerance to high temperature stress.

Highlights

MATERIALS AND METHODS Seven popular soybean genotypes were used in this study and screened for thermotolerance using Temperature Induction Response (TIR) approach
Measurement of enzymes associated with cellular level tolerance: The antioxidant enzymes activity of the induced seedlings was assessed in the seven contrasting soybean genotypes
Standardization of optimum lethal temperature and induction temperature for TIR : Results depicted in Table 1 showed reduction in shoot and root growth of the induced seedlings over control with increase in the lethal temperature while survival per cent decreased

Summary

Introduction

The seedlings that survive after lethal temperature with high recovery growth can be developed into thermotolerant lines (Senthil Kumar, 2001). Measurement of enzymes associated with cellular level tolerance: The antioxidant enzymes activity of the induced seedlings was assessed in the seven contrasting soybean genotypes. RESULTS AND DISCUSSION Standardization of optimum lethal temperature and induction temperature for TIR : Results depicted in Table 1 showed reduction in shoot and root growth of the induced seedlings over control with increase in the lethal temperature while survival per cent decreased.

Results

Conclusion