بررسي اثر تنش كم آبي پس از گرده افشاني بر قدرت بذر حاصله دو رقم گندم

Effects of Post - anthesis drought stress on seed vigor in two wheat cultivars

Water availability is one of the important environmental factors that affect plant growth and development. In Gorgan and dasht region, wheat grain filling period is faced with water shortage. Therefore, Knowledge about the effect of the drought stress on vigor of harvested seeds is important and helpful. In this experiment 3 post - anthesis moisture regimes, i. e, control (80% of field capacity), irrigation at 112 and 1/3 of the control, and two wheat cultivars (Tajan and Zagros) were used. Treatments were arranged as factorials were compared in a complete block design with 8 replications. After harvest, seeds were evaluated for vigor. Results showed that the cultivars were significantly different with respect to shoot dry weight and 1000 - seed weight. Shoot dry weight and 1000 - seed weight in Zagros cultivar 9% and 13.5% were greater than Tajan cultivar, respectively. Seed weight in both cultivars decreased with increase in drought stress level, but the decline was faster in Tajan compared to Zagros. In seed vigor experiment, there was no significant effect of drought stress, in cultivars and their interaction on maximum germination, germination rate and uniformity.