Investigation of the nano –chelated potassium effects on morphological and physiological characteristics of the wheat under drought stress

Barzegari, Zahra and Ghasemian, Alireza and Asadi, Asadollah and Razavi, Seyed Mehdi and Gahanbakhsh, Sodabeh (2015) Investigation of the nano –chelated potassium effects on morphological and physiological characteristics of the wheat under drought stress. Masters thesis, University of Mohaghegh Ardabili.

Text (: بررسی اثرات نانوکلات پتاسیم برخصوصیات مورفولوژیکی وفیزیولوژیکی گیاه گندم (wheat) تحت تنش خشکی) Zahra Barzegari.pdf Download (389kB)

Abstract

drought is the most important factor limiting plant growth .and given that the potassium role in the vital activity of the plant and prevent the devastating effects of the drought .the aim of this stady was to investigate the impact of nano-chelated potassium on drought tolerance in wheat .for this purpose the effect of nano-chelated potassiumon drought tolerance in wheat plant Multifactorial experiment was conducted in a completely randomized design ,the experiment consisted of three levels of drought stress (0,-4and-8Bar),three levels of foliar application of chelated potassium (0,35and65 mg per litr )and two wheat varieties (Rasad and Kascozhen)in three replicates .stress was conducted at 3and 5 leaves .The first sample within 5 days after exposure to plant the stress caused by polyethylene glycol 6000and the same time the leaves was sprayed nano-chelated potassiom. Results indicate that stress causes activity increase of enzymes of catalase, peroxidase, polyphenol oxidase and ascorbate peroxidase and adaptive metabolites of proline, solvable sugars and protein. Also, stress causes decrease of amount of chlorophyll a, chlorophyll b, total chlorophyll and maximum fluorescence, and quantum performance and increase of cartenoids. Tress causes decrease of growth of different parts of plants such as height of stalk, length of stem, length of internode and length of leaf. Also, stress causes decrease of wet and dry weight of stalk but had not meaningful effect on wet and dry weight of stem. Among the used items, Casco Gen had indicated more suitable reaction in most of the measured adjectives compared with figure of percentage, which this can indicate more tolerance of this item than dryness stress. Use of nano clot potassium caused decrease of effects of stress on the measured adjectives and in some cases caused increase of defensive mechanism of plant against destructive effects of stress such as increase of activity of enzymes of anti oxidant and metabolites of adaptivity and also caused improvement of photosynthesis system of the plant. Among the concentrations used in this material in most cases, use of 65 mg/l can be a good remedy in terms of effectiveness and is recommendable for farmers

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