Water shortage or drought stress is an environmental factor that strongly affects crops ‎productivity in various regions of the world. Sowing date as a factor affecting the growth ‎and yield of oilseed crops can alleviate drought stress occurring in reproductive stage. To ‎assess this, agronomic and physiological response of five canola genotypes (L1030, L1204, ‎L1110, L1114 and Okapi) to drought stress were evaluated at two early and late sowing ‎dates (7th and 27th October, respectively) as a two-year field experiment. Results showed ‎that drought stress significantly reduced the seed yield and yield components of all ‎genotypes at both sowing dates, which was a consequence of damage to photosynthetic ‎pigments, reduction of relative water content. However, early sowing was able to alleviate ‎drought stress effect; as seed yield of different genotypes at early sowing were 38-47% ‎higher than late sowing. Moreover, the measured oil content was not influenced by drought ‎stress and sowing date, so the highest oil content at both sowing dates were recorded in ‎L1204 genotypes. Finally, the results showed that sowing of suitable genotype in the proper ‎date could be an appropriate approach to canola sowing in semi-arid areas.‎ پرونده مقاله

This study aimed to investigate the effect of foliar application of Cycocel and micronutrients of iron and zinc on wheat yield and physiological traits under drought stress during the crop years of 2017-18 and 2018-19. The experiment was performed as a split factorial in a randomized complete block design in three replications. In this experiment, irrigation at two levels (I1: regular irrigation and I2: cut off irrigation at the beginning of the reproductive stage) was considered the main factor. Also, Cycocell at two levels (C1: non-consumption and C2: Cycocell consumption of 0.5 l.ha-1) and foliar application of micronutrients at four levels (F1: pure water, F2: foliar application of iron, F3: foliar application of zinc, and F4: foliar application of iron + zinc (each in a ratio of 3 per thousand)) were considered sub-factors in factorial. The results showed that under normal irrigation conditions, both in terms of application of Cycocell and non-application, the application of iron + zinc had the lowest amount of ascorbate peroxidase and catalase. Under water stress conditions and non-application of Cycocel, the concentration of ascorbate peroxidase and catalase decreased significantly with the consumption of micronutrients, but their concentration increased with the consumption of micronutrients and Cycocel. In general, foliar application of Cycocel and iron + zinc under stress reduced the concentration of antioxidant enzymes. پرونده مقاله