A limiting factor in wheat production in many countries is the
occurrence of temperature stress at grain filling stage especially
in West Asia and North Africa. In about 40% temperate environments
constituting 36 million hectares, terminal heat stress is a major
threat. Keeping in view this threat present investigations were
made to explore sources of heat tolerance and its genetics.100
genotypes of wheat were screened in a plastic tunnel for heat
tolerance by providing them heat stress at the time of anthesis.
Selection of the genotypes was based on grain weight, number of
grains per spike and grain yield per 25 spikes after computation of
their relative ratios. The selected genotypes were also tested by
measuring their electrolyte leakage to confirm the tolerance and
susceptibility by calculating relative injuries. Seven genotypes
including 3 heat tolerant, 1 moderately tolerant and 3 susceptible
were crossed in a 7 x 7 diallel fashion.The information obtained
from these results during the current studies may be used to evolve
high yielding varieties which can produce higher yield and help
maintain yield sustainability in those areas where terminal heat
stress is a major threat.
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