Subject Areas : Journal of Crop Ecophysiology

Nilofar Maheri ¹ , Tayeb Sakinejad ² , دکتر عادل مدحج ^{3 *} , Mohamad reza Dadnia ⁴ , کیوان مرعشی ⁵

1 - IAU, AhvazBranch
2 - IAU Ahvaz Branch
3 - واحد شوشتر
4 - IAU AhvazBranch
5 - دانشگاه آزاد اسلامی واحد اهواز

Received: 2022-04-08 Accepted : 2023-04-29 Published : 2024-09-22

Keywords: 1000-Seed weight, Bread wheat, Catalase, Cytokinin, Jasmonic acid, Salicylic acid.,

Abstract :

In order to investigate the effect of growth regulators on grain yield and some physiological traits of wheat cultivars under irrigation regime, a double split plot experiment was conducted in a randomized complete block design with three replications, in the research farm of Ahvaz Islamic Azad University during the cropping years of 2016-17 and 2017-18. The main factor of irrigation regime in 2 levels included: irrigation until the end of the season and interruption of irrigation in the stage of seed filling. Bread wheat cultivars in 2 levels included: Chamran 2 and Durum Karkhe in the sub-plot and growth regulators in 4 levels included: no growth regulator (control), jasmonic acid, salicylic acid and cytokinin in the sub-plot. The results of composite variance analysis showed that the triple interaction of irrigation regime, cultivar and growth regulators on grain yield and biological yield was significant. The highest seed yield (4803 kg.ha-1) was related to full irrigation treatment and application of salicylic acid in Chamran 2 variety. Although the grain yield has decreased by 15.5% due to the interruption of irrigation in the seed filling stage, but the application of salicylic acid was able to compensate to some extent the negative effect of drought stress on grain yield. Also, the interaction of drought stress at the end of the season and growth regulator on thousand seed weight, chlorophyll index, catalase enzyme and leaf area index was significant. Although drought stress caused a decrease in wheat yield, growth regulators partially compensated for the decrease in yield caused by drought. In general, to increase growth and yield in favorable conditions and to reduce losses in stressful conditions, it is recommended to use salicylic acid regulator in Chamran 2 variety in Ahvaz region and similar regions in terms of climate.

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