رضا دادنیا

An experiment was conducted to investigate the effect of salicylic acid (Sa) and jasmonic acid (Ja) pretreatment hormones on germination and seedling growth of Chamran and Karkheh wheat cultivars under drought stress (St). The cultivars seeds were primed with Ja (100 μM) and Sa (10 mM). St was applied using polyethylene glycol (PEG-6000). The data were analyzed based on a factorial experiment with three replications in a randomized complete block design. The use of Ja and Sa reduced the effects of St on wheat germination indices and the use of Ja was more effective. St reduced germination by 33.45%, while the application of Ja and Sa improved it to 22.5%. Germination seedling stress and seed length vigor index were also decreased by 23.7 and 55% under St compared to the control, but with Ja and Sa application, these indices improved to 20 and 16%, respectively. The sensitivity of Karkheh variety with less accumulation of proline was higher in St conditions and it improved to a great extent with the application of Ja and Sa. It is recommended not to use the Karkheh for the southern and western parts of Khuzestan province, where there is a high probability of St occurrence. Considering the improving effect of Ja and Sa on the germination indices of wheat seeds tested in this study, it is suggested that during additional studies, other seeds of wheat cultivars should also be tested with these hormones for use in tropical areas.

The present two-year research (1397-1398) investigates the effect of Mycorrhizal inoculation. For this purpose, it takes the combined ratio of Auxin/Gibirlin and Ascorbic acid on the yield and yield components of corn, in the form of split factorial design in the form of randomized complete blocks in three replicates in  Shahid Salemi farm. It has been done north of Ahvaz city. The main factor of the treatments include Mycorrhizal fungus (Glomus intraradices species) at two levels (inoculation and non-inoculation) before planting and the secondary factor includes the ratio of Auxin hormone to gibberellin at three levels (0, 300/600, and 600/300) mg/liter and ascorbic acid at three levels (0, 100, and 200) mg/liter are applied as foliar spraying. The results show that Mycorrhiza has a significant effect on the dry weight of leaves, stems, and cobs, seed weight and yield, as well as biological traits, respectively, the highest seed yield amounting to (7410.72) kg is related to the treatment levels of Mycorrhizal inoculation, the ratio of Auxin to gibberellin is 600 mg to 300 mg and in 200 mg of ascorbic acid and the highest yield of stem dry weight (100 grams) . In the triple interaction of the experimental factors in the treatment levels, there has not been any Mycorrhiza inoculation. For not using the hormonal compound and using 100 mg of ascorbic acid, the highest seed yield in the row (45.46%) has been obtained in the ratio of Auxin to gibberellin of 600 mg to 300 mg and using 200 mg of ascorbic acid. According to the positive effect of the use of experimental factors, the use of Mycorrhiza and the mentioned hormones, and ascorbic acid are recommended.