Abstract:
A field research was conducted at IAAS, Rampur, Chitwan from November, 2014 to April, 2015
to evaluate different barley genotypes for their response to terminal heat stress based on grain
traits and heat stress indices. Altogether, 12 exotic genotypes and one landrace were sown in two
dates (normal sowing: 29th November, 2014 and late sowing: 1
st January, 2015) under two factor
factorial RCBD with three replications during winter season of 2014/15. The various grain traits
were found to be significantly influenced by terminal heat stress. As compared to normal sowing
condition, grain yield reduced by 69.8% spike length by 7.9%, grain per spike by 57.69%, grain
length by 3.86% in late sown condition. Similarly, dorsal grain width, ventral grain width and
thousand grain weight reduced by 2.73%, 2.39% and 10.37% respectively in stressful
environment, while sterility was found to be increased by 20.15%. The mean tolerance level,
geometric mean productivity, stress susceptibility index and stress tolerance index of genotypes
stood out to be 774 kg ha-1
, 523.9 kg ha-1
, -0.20 and 0.128 respectively. Due to stable production
and high stress tolerance index Soluwa and SBYT 14-1 were observed to be promising in
Chitwan, Nepal condition. New avenues can be opened for the further research and breeding of
such heat tolerant barley lines.
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