Screening of Genotypes Against High Temperature Stress in Wheat
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Date
2000
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Birsa Agricultural University, Ranchi
Abstract
Wheat is an important cereal crop of the world, next to rice. In India this crop is grown in Rabi season. A lot of research work have been done in the field of production breeding and we have achieved almost plateau in this crop. But there is a vast scope of research in the field of stress breeding for various stress environments. The present investigation thus aims in breeding for wheat in high temperature stress condition.
Breeding wheat varieties for stable yield under high temperature condition has become a subject of major interest. Various mechanisms imparting heat resistance like escape, endurance, avoidance and tolerance etc. have been put forward by various workers. Testing of performance of genotypes under stress conditions is a very useful technique in breeding programs mainly because it allows a direct estimate of heat susceptibility of individual genotypes.
Breeding for heat tolerance to increase crop production in high Temperate Zone worldwide is impeded by lack of suitable screening technique. Therefore, there is a need to identify a plant trait, which is directly related to heat tolerance and can be quickly measured for use as a screening parameter. Ion leakage, one of such parameter to screen out for various crops.
Keeping all these fact in consideration the present research problem was carried out in Randomized block design, two sets of sowing-normal and late, creating, two different thermal environments for two years at Ranchi Agricultural farm from 1997 to 1999. For the present study 20 genotypes/varieties, obtained from AIRCRP on wheat were used with an objective to identify varieties suitable for high temperature with better stability.