Hossein Rabbi Angorani; Jaber Panahandeh; Sahebali Boland nazar; Jalal Saba; fariborz Zare Nahandi
Abstract
Oxidative stress is one of the most important consequences of drought stress. Salicylic acid is a phenolic compound which serves as a growth regulator in the induction of resistance to drought. In order to investigate the role of salicylic acid on some anti-oxidant enzymes and some biochemical attributes ...
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Oxidative stress is one of the most important consequences of drought stress. Salicylic acid is a phenolic compound which serves as a growth regulator in the induction of resistance to drought. In order to investigate the role of salicylic acid on some anti-oxidant enzymes and some biochemical attributes of medicinal pumpkin under drought stress, an experiment was designed 2014 in Zanjan University’s Research Farm, Iran. The study was arranged as factorial experiment based on a randomized complete block design with three replications including drought stress at four level; control, mild stress, moderate stress, and severe stress have been arranged in four levels including (100, 85, 70 and 55% FC). Salicylic acid treatments included salicylic acid were applied as foliar application spray in four levels: 0 mg/l (solution spray with distilled water), 0.5, 1, and 1.5 mg/l. Measured traits included peroxidase, catalase, Beta-sitosterol and oil yield proline, electrolyte leakage, malondialdehyde (membrane peroxidation index) content. The results showed that increasing drought stress levels reduced the oil yield, but in contrast, increasing the Beta-sitosterol, membrane peroxidation, electrolyte leakage, anti-oxidant enzymes such as catalase and peroxidase, while application of salicylic acid at 0.5 and 1 mg/l decreased oxidative stress, membrane peroxidation and Electrolyte leakage through increasing the anti-oxidant enzymes activities such as catalase and peroxidase and proline which led to a balanced rise in oil yield and Beta-sitosterol in mild and moderated stress. These results show an increase in plant resistance to drought as a result of salicylic acid application.
Saloomeh Taheri; Taher Barzegar; Vali Rabiei; Hossein Rabi Angoorani
Abstract
Salinity is one of the most important environmental stresses that affect plant growth. In order to study the effect of Salicylic Acid (SA) on some physiological characteristics of basil under salinity conditions, the experiment was set out as a factorial design in the base of RCBD with three replications. ...
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Salinity is one of the most important environmental stresses that affect plant growth. In order to study the effect of Salicylic Acid (SA) on some physiological characteristics of basil under salinity conditions, the experiment was set out as a factorial design in the base of RCBD with three replications. Treatments consisted of four NaCl salinity levels (0, 50, 100, 150 mM), salicylic acid at three levels (0, 0.25, 0.5 mM) and two cultivars of basil (purple and green). Results showed that salinity significantly decreased amount of chlorophyll, carotenoid and leaf relative water content. Application of SA increased amounts of chlorophyll, carotenoid and leaf relative water content. The amount of proline, stomatal resistance and electrolyte leakage in leaves increased significantly under salinity condition and decreased with treatment of salicylic acid. The highest amount of chlorophyll b (0.617 mg/g FW-1) and the minimum electrolyte leakage (30.4 percent) was observed with application of 0.5 mM SA under of 0 mM NaCl concentration in green and purple basil cultivars, respectively. Also, the maximum content of proline (11.4 µg/g FW-1) and the lowest rate of stomatal resistance (7.8 s/cm-2) were obtained under 150 mM NaCl in purple and green basil cultivars, respectively. According to the results, application of salicylic acid can be proposed to improve plant growth under salinity conditions.