Effect of Salt Stress and Synthetic Hormone Polystimuline K on The Photosynthetic Activity of Cotton ( Gossypium hirsutum)

Authors : Rena A GANIEVA

Pages : 217-222

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The effects of Polystimuline K insert ignore into journalissuearticles values(PS-K);, as a cytokinin analogue, on delayed light component state insert ignore into journalissuearticles values(DF);, intermittent fluorescence insert ignore into journalissuearticles values(IF); and chlorophyll insert ignore into journalissuearticles values(Chl); a/b ratio was investigated in the leaves of different genotypes of cotton insert ignore into journalissuearticles values( Gossypium hirsutum L.); under salt stress insert ignore into journalissuearticles values(155 mM Na Cl); for different periods of time. It was shown that in the early perioid of salt stress, DF and IF amplitudes are decreased, which is indicative of a Photosystem II insert ignore into journalissuearticles values(PS II); activity decrease. It is possibly related to the damage of chlorophyll in the PS II donor site and the decrease of Chl b molecules leading to an increased Chl a/b ratio. However, the improvement of the affected variables as a consequence of PS-K pretreatment suggests the stablizing effects of the synthetic growth regulator on the thylakoid membranes leading to a normalization of H + /NaCl exchange that consequently hastens the recovery of damaged PS II centers.
Keywords : Polystimuline K, chlorophyll fluorescence, salt stress, photosystem II, cotton