EFFECT OF HEAT STRESS ON SOME AGRONOMIC TRAITS OF BREAD WHEAT (TRITICUM AESTIVUM, L) GENOTYPES UNDER UPPER EGYPT CONDITIONS

Document Type : Research articles.

Authors

National Wheat Program, Field crops Res. Inst., Agric. Res. Center, Giza.

Abstract

Combined analysis of variance for all studied traits in twelve bread
wheat genotypes showed highly significant differences among lines and
sowing dates, as well as, the lines x sowing date interaction which
showed significant and highly significant for all traits except grain yield.
Delaying the sowing date to 20 December reduced grain yield, 1000
kernel weight, accumulated growing degree days (GDD), and duration of
grain filling period by 30.0, 6.2, 10.3, and 11.4%, respectively when
compared to normal sowing date (20 December), while the rate of grain
filling period was increased by 7% when compared to the optimum
sowing date (25 November).
Susceptibility index “s” for grain yield showed that lines 1, 2, 3, 7, 9
and 10 were the most tolerant lines to high temperature, meanwhile the
other lines were the more susceptible. Line number 5 recorded the
highest grain yield, longest duration with medium rate of grain filling
under late sowing date. These results indicated that the tolerant lines may
have genes controlling tolerance to heat stress. Hence, they could be use
as parents in breeding programs in Upper Egypt.

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