Influence of brassinosteroid analogs on tomato plant response to different environmental stresses
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Abstract
behaviour of young tomato plants under water deficit and the
changes of some antioxidant enzymes of foliar discs under
high temperature stress were studied in the present work. Two
experiments were conducted, at the first one, the effect of pretreated
tomato seeds (var. Amalia) was evaluated for eigth
hours with BB-6 solutions (0, 0.01 and 0.05 mg.L-1) on some
plant growth and biochemical indicators after 72 hours of
irrigation suspension. At the second one, the response of
antioxidant enzymes (catalase, superoxide dismutase and
peroxidase) was studied in tomato foliar discs from the same
variety incubated with MH-5 and 24-epibrassinolide solutions
(0, 0.001 and 0.005 mg.L-1) and submitted to high temperature
stress (40oC) for two hours. Results showed that plants from
treated seeds with 0.01 mg.L-1 BB-6 solution presented a
slightly more favorable foliar water status, providing a lesser
reduction of shoot height and diameter after 72 hours of
irrigation suspension. Under high temperature stress
conditions, treatments with natural 24-epibrassinolide (EPIBR)
and synthetic analog MH-5 enhanced the activity of the three
antioxidant enzymes evaluated. It is suggested that these
brassinosteroid analogs could protect tomato plants under
water and high temperature stress conditions.
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