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Title

EFFECT OF DROUGHT STRESS AT PRE AND POST-ANTHESIS ON DRY MATTER ACCUMULATION OF GRAINS IN IRRIGATED WINTER WHEAT

Pages

 Start Page 19 | End Page 28

Abstract

 Investigating assimilate contribution and grain filling pattern in winter WHEAT is importance under DROUGHT STRESS condition. This study was conducted to evaluate the relationship between DROUGHT STRESS on grain filling and yield of 4 cultivars including MV17 (dwarf), Alvand, Shahryar (semi-dwarf) and Toos (tall). Experimental design was randomized complete block with three replications. DROUGHT STRESS assigned to main plots and cultivars to sub plots. Growth curve sampling started at 7 days after ANTHESIS with 4 days interval. In preANTHESIS DROUGHT STRESS Alvand produced highest yield, while it was 29.14% less than control treatment. The yield of Toos cultivar was lowest at pre-ANTHESIS DROUGHT STRESS. RATE OF GRAIN FILLING of Toos cultivar did not change at pre-ANTHESIS DROUGHT STRESS. DROUGHT STRESS treatment at post-ANTHESIS decreased RATE OF GRAIN FILLING in all cultivars as compared to control, but it was significant only Toos c.v. In pre-ANTHESIS DROUGHT STRESS grain filling duration increased in Alvand but decreased in Toos. Alvand with higher RATE OF GRAIN FILLING produced highest grain yield (3850 kg/ha). It can be concluded that, DROUGHT STRESS decreases grain filling duration and RATE OF GRAIN FILLING.

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