Journal of Food, Agriculture and Environment

Assessment of acquired thermotolerance in Indian bread wheat and association with yield and component traits under heat stress environment

Author(s):

Suman Sud ^*, S. G. Bhagwat

Recieved Date: 2010-01-12, Accepted Date: 2010-04-07

Abstract:

High temperature is an environmental constraint limiting wheat productivity. In India considerable acreage is affected by heat stress at seedling stage or adult plant stage or both. Genetic variability among wheat cultivars for ability to tolerate heat stress has been reported. The present study was undertaken to assess Indian wheat cultivars for their acquired thermotolerance using membrane thermostability (MTS) assay and the triphenyl tetrazolium chloride reduction (TTC) assay at seedling stage. The results showed that there was variability among cultivars for acquired thermotolerance. Varieties that showed higher acquired thermotolerance in assays were grown for two years under field conditions. Rate of flag leaf senescence, yield and yield components were recorded. Significant differences were observed among the seven genotypes for flag leaf blade area remaining green 17, 24 and 31 days after flag leaf emergence. TTC and MTS values showed significant correlation when all 56 genotypes were taken into account. Tolerant cultivars showed significant differences in yield and yield components in comparison to a non-tolerant cultivar. There were also significant differences for components of grain yield among the thermotolerant cultivars. The TTC assay values correlated significantly with tiller number, grain yield and plant weight on per meter basis. The probable cause of this correlation was higher tiller number in tolerant genotypes. Simultaneous selection for higher yield contributing traits along with thermotolerance will be needed in genotypes for heat stress areas.

Keywords:

Triticum aestivum, heat stress, acquired thermotolerance, TTC, MTS, yield components

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Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 2
Category: Agriculture
Pages: 622-627

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