fluctuation of physiological characteristics and tolerance signals in parent's seeds and Seeds exposed to drought stress in cotton (Gossypium hirsutumL.) plant.

mohammad habibi ¹ (Departemant Biology of Islamic Azad university of Gorgan,Iran.) Mohammad Ali Rezaee ² (گروه زیست‌شناسی، دانشگاه آزاد اسلامی، واحد گرگان، گرگان، ایران)
Elham Faghani ³ (گروه زراعت، موسسه تحقیقات پنبه، سازمان تحقیقات، آموزش و ترویج کشاورزی، گرگان، ایران) Mehr Ali Mahmood Janloo ⁴ (گروه زیست‌شناسی، دانشگاه آزاد اسلامی، واحد گرگان، گرگان، ایران) Mohammad Hossein Razzaghi ⁵ (گروه مهندسی کشاورزی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی گلستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، گرگان، ایران)

Submited date : 2020-10-14 accepted date : 2020-10-28

Keywords: "Drought stress", "Antioxidant enzymes", "Cotton", "Osmolytes", "Photosynthetic pigments", "Signaling",

Abstract :

Drought stress is a limiting factor in growth and production in more than 30% of the world's cultivated areas. One of the ways to deal with drought stress is to cultivate plants that are more resistant to this stress and cotton is one of these plants. There is little information about the physiological and biochemical properties of cotton under stress conditions and therefore this study was designed to identify the fluctuation of physiological characteristics and tolerance signals in mother seeds and seeds under drought stress in cotton plants. Experimental factorial, in the form of a randomized complete block design, in 5 seed treatments (including 4 levels of stressed seeds and non-stressed seeds) and stressed seeds at 4 levels of irrigation (rainfed, 33%, 66%) And 100% of the field capacity of the farm) was implemented. In this study, the seeds used were exposed to drought stress in 3 stages during different cropping seasons. The results showed that the effect of irrigation on yield and yield components was significant and the highest total yield was observed in 33% seeds under irrigation 33% of field capacity and the highest early maturity was observed in 66% irrigation. The results showed that severe drought and waterlogging reduce cotton yield and 33% seed after 3 years of exposure to moderate stress by stimulating physiological mechanisms and increasing the amount of osmolytes and antioxidant enzymes. And photosynthetic pigments became more adaptable to drought stress. The results of this study showed that the exposure of seeds to mild to moderate stress, strengthens the signaling pathways and increases the potential of seeds to tolerate drought stress, which can be considered by seed propagation centers.