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Genotypic difference for heat tolerance traits under real field conditions

Published on Jan 1, 2012
Mohammad Kazem Shefazadeh6
Estimated H-index: 6
,
Mohtasham Mohammadi11
Estimated H-index: 11
,
Rahmatollah Karimizadeh10
Estimated H-index: 10
Abstract
The difficulty of selecting for improved adaptation to heat stress makes the use of indirect measures attractive to plant breeders. To examine the response to selection on canopy temperature, leaf chlorophyll content, Fv/Fm ratio and kernel weight and to evaluate the response of some wheat genotypes facing high temperatures during and after anthesis under field conditions, ten bread wheat genotypes were exposed to two different sowing dates: normal and late sowing, to assure high temperatures during and after anthesis, in 2010-2011 in a field adjacent to Gachsaran Agricultural Research Station that is located in southwest Iran. Results indicated significant difference for all physiological traits and significant phenotypic correlation with grain yield, particularly in more heated environments. Canopy temperature explained 71 and 54.2% of grain yield variation in more and less heated environments, respectively. The lines having tolerance to high temperature during grain filling stage were marked for future breeding program.
  • References (26)
  • Citations (6)
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References26
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For over 40 years a collaborative network of publicly funded international wheat scientists has made a significant contribution to food security in the developing world. Thousands of modern wheat varieties (MVs) have been released for use in both favourable and marginal environments on well over 50 million hectares. The yield increases associated with genetic improvement in yield potential and adaptation to biotic and abiotic stresses are well documented. Millions of small-scale farmers in the d...
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