INFLUENCE OF 28-HOMOBRASSINOLIDE ON PHOTOCHEMICAL EFFICIENCY IN BRASSICA JUNCEA UNDER DUAL STRESS OF EXTREME TEMPERATURES AND SALTPage No: 4205-4213
By: Harpreet Kaur, Geetika Sirhindi and Renu Bhardwaj
Keywords: Brassica juncea, temperature stress, salt stress, 28-homobrassinolide, photosynthesis, photosystem II
Abstract: The plants of Brassica juncea L. cv. RLC-1 were supplemented with 28-homobrassinolide (28-homoBL), exposed to
dual stress of low and high temperatures along with salinity in the controlled environment, showed inhibitory effect on
growth, photosynthetic pigments and efficiency of PSII. 28-homoBL mitigated the noxious effect of dual stress on B.
juncea plants by promoting chlorophyll pigments which ultimately enhanced the photosynthetic efficiency of PSII
reaction centres (RC) significantly. Extreme temperature of 4 and 44°C deteriorated total carotenoids to significant levels
as compared to control distilled water plants exposed to (180 mM) NaCl salt or temperatures (24, 4 and 44°C). Our
results indicated that 28-homoBL redirects the photosynthetic pigments of developing B. juncea seedlings to modulate
the photosystem II activity for supporting photochemical efficiency at above level under single or dual stress of extreme
temperature and salt
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