انتخاب اولیه لاین‌های گندم نان برای تحمل به تنش خشکی آخر فصل

Abs. Drought stress is one of the main limiting factors in yield production of wheat and introduction of drought resistant varieties that is the aim of plant breeding. In order to investigate advanced bread wheat lines under drought stress and selection of resistant lines, 155 selected lines as well as four varieties Pishtaz, Shiraz, Marvdasht and Bahar as check were examined in two environment under normal irrigation and water stress in the late of season. Cultivated area was equal to 7.2 square meters plot and density was 400 seeds per square meter. Planting and irrigation was performed on the 30th of November and end of irrigatied was in the bolting period 11th May. All assessments were performed during the growing season, such as response to winter cold, heading date, physiological maturity, seed weight and product weight. Drought resistance indices SSI and STI was calculated For all genotypes of the grain yield and seed weight. Results shows 38 lines are better genotype and selected for next year replicated experiment drought tolerance (ARWYT-WS).