Effect of foliar application of GA3, kinetin, and salicylic acid on ions content, membrane permeability, and photosynthesis under salt stress of sweet sorghum [Sorghum bicolor (L.) Moench]
2016
Nimir, N.E.A. | Zhou, G. | Guo, W. | Ma, B. | Lu, S. | Wang, Y.
Salt stress increases the accumulation of toxic ions in chloroplasts of higher plants and is associated with decreased photosynthesis. A pot experiment was conducted to investigate the effect of foliar application of gibberellic acid (GA₃, 288.7 µM), kinetin (232.3 µM), and salicylic acid (362 µM) under salt stress (0, 2, and 4 g kg⁻¹ dry soil) on two sweet sorghum varieties (Yajin 13 and Yajin 71). The investigation parameters included the content of Na⁺, K⁺, Ca²⁺, P, and Mg²⁺, photosynthetic rate, transpiration rate, stomatal conductance, and membrane permeability. The results indicated that Na⁺ content increased gradually with salt increase. Photosynthetic rate, stomatal conductance, transpiration rate, and K⁺ content were significantly decreased due to high salt concentration. The medium salinity level of 2 g NaCl per kg dry soil decreased P, Ca²⁺, and Mg²⁺ content. Of hormonal treatments, GA₃ and kinetin caused significant increase in photosynthetic rate, stomatal conductance, and transpiration rate. Salicylic acid was the best hormone treatment for reducing membrane permeability and Na⁺ content under salt stress. Yajin 13 had less Na⁺ content than Yajin 71, and was more tolerant to salinity than Yajin 71.
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