Effect of 24-epibrassinolide on growth and photosynthesis of young rice plants treated with naCl
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Abstract
At present, salinity is one of the most pressing causes of stress, and brassinosteroids are compounds which stimulate plant growth and also, increase the plant tolerance to salt stress. In this paper, the effect of foliar spraying with a natural brassinosteroid (24-epibrassinolide, EBL) in rice seedlings subjected to this kind of stress was evaluated. To do this, rice young plants of J-104 and Gines cultivars were sprayed with EBL (2 μmol L-1), and then, half of them were treated with NaCl (100 mmol L-1) for seven days, and later, they were transferred to nutrient solution to assess recovery for 14 days. Evaluations of growth (length and dry mass of aerial parts and roots) were performed at three and seven days of saline treatment and seven and 14 days of recovery. Some indicators of photosynthesis such as photosynthetic rate, stomatal conductance, transpiration, intercellular CO2 concentration and photosynthetic pigments (chlorophylls and carotenes) were also determined. The results showed that, in general, foliar spraying with EBL 2 μmol L-1 stimulated the length and dry mass of rice seedlings of both cultivars under saline conditions which appear to be associated with increased photosynthesis, gas exchange and chlorophyll concentration.
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