جستجوی مقالات مرتبط با کلیدواژه « پنیرباد » در نشریات گروه « زراعت »

In order to evaluate the effect of water deficit stress and foliar application of zinc oxide nano particles on morphophysiological characteristics in Withania coagulans L. landraces, a factorial experiment in a completely randomized design with 3 replications was setup. The experiment included various irrigation regimes (control), (medium stress), (severe stress), four landraces (Fanuj, Khash, Saravan and Sarbaz), with and without foliar application of zinc oxide nano particles. The experiment was conducted in green house of the faculty of Agriculture, Tarbiat Modares University, during 2018-2019. The highest leaf area (538.92 cm2) was related to Sarbaz in control irrigation and the lowest leaf area (245.88 cm2) was related to Khash in severe water deficit stress. Based on the comparison results, the mean of maximum plant dry weight (1.76 g) was related to Sarbaz and control irrigation and the lowest plant dry weight (0.63 g) was related to Fanuj and severe water deficit stress. Also, the highest amount of chlorophyll a (2.55 μmol.g-1) was related to Khash, control irrigation and foliar application of zinc oxide nano particles. The highest amount of chlorophyll b (1.26 μmol.g-1) was related to Fanuj, control irrigation and foliar application of zinc oxide nano particles, which was not significantly different from other landraces. Also, the lowest amount of chlorophyll b (0.62 μmol.g-1) was related to Khash, severe water deficit stress and without foliar application of zinc oxide nano particles. Sarbaz had the highest amount of anthocyanin (0.3 μmol.g-1) in the treatment of severe water deficit stress and lack of foliar application of zinc oxide nano particles, which was not significantly different from Saravan. Also, the lowest amount of anthocyanin (0.146 μmol.g-1) was related to Fanuj in the treatment of severe water deficit stress with foliar application of zinc oxide nano particles. Severe water deficit stress reduced the amount of traits tested. Also, the Sarbaz showed good tolerance to water deficit stress conditions compared to other landraces. The foliar application of zinc oxide nano particles also improved plant growth and increased some of the tested traits under stress conditions.

Withania somnifera belonging to Solanaceae family. This research was conducted to optimizing the methods of breaking the dormancy of Withania somnifera in two independent experiments. The first experiment was carried out in a factorial arrangement in a completely randomized design experiment with four replications. The first factor was cold treatment at 5 levels (0, 10, 20, 30, 40 days at 4 ° C) and second factor was chemical treatment at 7 levels consist of gibberellic acid (500, 750 and 1000 ppm), potassium nitrate (1000, 2000 and 3000 ppm) and control was distilled water. In the first experiment, the seeds were grown in Murashige and Skoog plant growth medium in test tubes. The second experiment was carried out in the same design as the first experiment but the seeds were cultured after applying cold and chemical treatments inside a petri dish covered with filter paper. Finally, germination percentage, germination rate and average germination rate were calculated. In the first experiment, the highest (100%) and the lowest (15%) germination percentage were seen the treatment of chilling for 10 days + 750 ppm gibberellic acid and control treatment respectively. The application of cold and chemical treatments caused a significant difference in the average germination rate in the tube environment (P<0.01). The minimum germination rate showed in 10 days cold + different amounts of chemical treatment. In the second experiment, application of different treatments caused a significant difference in germination percentage. The highest germination percentage (85%) was observed in 20 days cold + 3000 ppm potassium nitrate treatment. The effects of cold and chemical treatments and their interactions caused a significant difference in germination rate (P<0.01). The minimum germination rate was in 10 days cold + 2000 ppm potassium nitrate treatment. Our results showed that cold period is an essential factor for eliminating of dormancy in Withania somnifera.