The effect of drought stress and salicylic acid on the morphological and physiological characteristics of Alcea setosa

  • Reza Norouzi Esfahani Department of Landscape Architecture and Plant Science, Islamic Azad University, Arak Branch, Arak, Iran
Keywords: growth regulator, drought, photosynthesis, medicinal plants


Since the exogenous application of salicylic acid can increase tolerance to drought stress by improving metabolic pathways and increasing net photosynthesis, and investigate the effect of the application of salicylic acid and drought stress on some morphological and physiological traits of Hollyhocks, an experiment in the form of plots Shredded in the form of a randomized complete block design in four replications in the conditions of the research farm of Azad University, Isfahan Branch. The purpose of this study is to determine the effect of salicylic acid application at three check levels, 50 and 150 ppm, and water deficit stress in two levels of normal irrigation and water deficit stress (irrigation at the time of 50% soil crop capacity). Finally, flower diameter, inflorescence height, number of secondary stem flowers, flowering stem diameter, wet weight, superoxide dismutase, total chlorophyll, flavonoid 270, flavonoid 300, flavonoid 330, proline, and catalase were evaluated. The results showed that stress had a reducing effect on growth and experiments were carried out in practice. As a result of stress, the ratio of flower diameter first decreased, but increased with increasing dryness. The application of salicylic acid improved the morphological and physiological traits of Hollyhocks under the stress of low irrigation. While the treatment of 50 ppm salicylic acid showed the greatest effect on most of the studied traits. As a result, to improve vegetative growth and increase the reproductive efficiency of Hollyhocks and reduce production costs under stress conditions, the use of salicylic acid is recommended. In the present study, the salicylic acid foliar application showed high efficiency in increasing the yield of Hollyhocks in Isfahan weather conditions.

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