Effect of Salicylic Acid on Growth and Some Morphophysiological Characteristics of Gomphrena (Gomphrena globosa L.) under Salinity Stress
Message:
Abstract:
Salicylic Acid (SA) is considered as one of the useful compounds for plants that plays an important role in plant resistance to environmental stresses such as salinity stress. For this purpose and to evaluate the effect of salicylic acid (SA) and salinity on morphophysiological and qualitative characteristics of Gomphrena (Gomphrena globosa), an experiment with three levels of SA (0, 200, 400 ppm) and three concentrations of sodium chloride (0,150, 300 mM) was conducted as a factorial experiment based on completely randomized design with 4 replications. at the end of the experiment growth characteristic such as shoot and root dry weight were measured. Also chlorophyll index, relative water content (RWC), electrolyte leakage (EL) were evaluated. Flower number as a qualitative trait were counted at the end of experiment. Results of interaction effect of salinity and SA showed that by increasing salinity stress up to 300 mM, stomotal conductance, flower number, shoot and root dry weight, chlorophyll index and RWC decreased 75, 96, 48, 48, 82 and 38 percentage respectively, and EL increased 99% compared whit control. While spraying with SA reduced the rate of electrolyte leakage and improved other measured traits. Foliar spraying of salicylic acid leads to maintain of turgidity and leaf dimension that it is due to increasing the relative humidity content. Also by increasing the photosynthetic pigments and protection of them during stress conditions like salinity stress, it leads to improving the physiological traits of plants and increase the tolerance of plant during stress condition. Based on the results of this experiment the best concentration of salicylic acid for foliar spraying, is 200 ppm that can be effective for improving the tolerance of plants to salinity stress.
Language:
Persian
Published:
Journal of horticulture science, Volume:26 Issue: 1, 2012
Page:
104
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