Impact of exogenous application of salicylic acid on the drought-stress tolerance in pepper (Capsicum annuum L.)

Document Type : Research Paper

Authors

1 PhD student, Department of Horticultural Sciences, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran

2 Department of Horticultural Sciences, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran

Abstract

To investigate the effect of drought stress on the physiological and chemical properties of the sweet pepper and the impact of the foliar application of salicylic acid (SA) on alleviating the negative effects of this stress, a factorial experiment was carried out using a completely randomized design in the greenhouse conditions. Drought stress levels were 100% field capacity (as control), moderate stress (60% field capacity), and severe stress (30% field capacity). Foliar SA was also applied at three concentrations of 0 (as control), 0.5, and 1 mM when the plants were at the four-leaf stage. The results showed that drought reduced shoot and root fresh weight and dry weight, relative leaf water content, fruit length and diameter, chlorophyll index, and leaf area, and increased electrical conductivity, antioxidant capacity, total phenolic content, ascorbate, polyphenol oxidase, and ascorbate peroxidase. After foliar of application SA, electrical conductivity decreased and other above-mentioned characteristics increased, however, the increase in shoot dry weight, root fresh weight, and chlorophyll index was not significant. From the results of this experiment, it can be concluded that SA alleviates the negative effects of drought stress in pepper.

Keywords


Article Title [Persian]

تاثیر کاربرد خارجی اسید سالیسیلیک بر تحمل به تنش خشکی در گیاه فلفل دلمه ای (Capsicum annuum L.)

Authors [Persian]

  • زهرا خزائی 1
  • اصغر استاجی 2
1 دانشجوی دکتری علوم باغبانی، دانشکده علوم کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل
2 گروه علوم باغبانی، دانشکده علوم کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل
Abstract [Persian]

به منظور بررسی تاثیر تنش خشکی بر ویژگی­های فیزیولوژیکی و شیمیایی فلفل دلمه­ای و اثر تیمار اسپری اسید سالیسیلیک بر کاهش اثرات منفی این تنش، آزمایشی در قالب فاکتوریل بر پایه طرح کاملاً تصادفی در گلخانه انجام شد. سطوح مختلف تنش خشکی شامل 30% ظرفیت زراعی (تنش شدید)، 60% ظرفیت زراعی (تنش متوسط) و شرایط غیر تنش (شاهد) بودند. استعمال تیمار اسپری اسید سالیسیلیک نیز در سه سطح صفر (شاهد)، 5/0 و 1 میلی مولار در مرحله چهار برگی صورت گرفت. نتایج نشان داد که تنش خشکی سبب کاهش وزن تر و خشک شاخساره و ریشه، میزان آب نسبی برگ، طول و قطر میوه، میزان کلروفیل و سطح برگ و افزایش هدایت الکتریکی، ظرفیت آنتی اکسیدانی، میزان فنول کل، آسکوربات، پلی فنول اکسیداز و آسکوربات پروکسیداز شد. در این آزمایش بعد از اسپری برگی با اسید سالیسیلیک، هدایت الکتریکی کاهش و سایر متغیرهای بالا افزایش یافت ولی افزایش شاخص کلروفیل. وزن خشک شاخساره و وزن تر ریشه معنی­دار نبود. با توجه به نتایج حاصل، مشخص شد که اسید سالیسیلیک سبب تعدیل اثرات منفی تنش خشکی در گیاه فلفل دلمه­ای می­­شود.

Keywords [Persian]

  • آسکوربات پروکسیداز
  • پلی فنول اکسیداز
  • ظرفیت زراعی
  • فنول کل
  • کلروفیل
  • هدایت الکتریکی
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