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Pakistan Journal of Biological Sciences
Year: 2006  |  Volume: 9  |  Issue: 11  |  Page No.: 2069 - 2075

Screening of Wheat (Triticum aestivium L.) Genotypes for Some Important Traits Against Natural Terminal Heat Stress

Ubaidullah, Raziuddin, Tila Mohammad, Hafeezullah, Sardar Ali and Abdul Wahab Nassimi    

Abstract: Wheat production is often reduced by terminal heat stress therefore present study was aimed to characterize wheat genotypes for their heat tolerance for some important traits. Plant material was composed of sixteen wheat (Triticum aestivium L.) genotypes including two check cultivars. Wheat genotypes were sown in the field at two dates i.e., November 15 (normal sowing) and December 13 (delayed sowing) during winter seasons of 2003-2004 and 2004-2005. Combined analysis of variance (for two years) showed that mean values for years were highly significant at p=<0.01 for majority of the traits, differences were significant (p=<0.05%) for grain filling duration while non-significant for days to emergence. For seasons; differences were highly significant for all parameters, whereas for genotypes; the differences were highly significant for all parameters except grain filling duration where differences were non significant whereas, response for different interactions was variable. In present experiment, generally late sowing imposed negative effects on all traits. However, two years combined data showed that minimum difference between early and late sowing was 23 days for heading (CT-4), 7 cm for leaf area (CT-12, 13 and 14), 6.3 cm for plant height (CT-10) and 3 days for grain filling duration (CT-9) whereas, CT-10 matured 29 days earlier when sown late in comparison to the normal sowing time. From the experiment it was concluded that CT-4 and CT-10 had built in terminal heat stress escape mechanism which could be used for the development of new early maturing variety.

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