Salinity Tolerance of Kentucky Bluegrass as Affected by Salicylic Acid

محورهای موضوعی : مجله گیاهان زینتی

Masoud Arghavani ¹ (Assistant Professor, Department of Horticultural Sciences, Faculty of Agriculture, University of Zanjan, Zanjan, Iran.)
Saeedeh Savadkoohi ² (Graduated M.Sc. Student, Department of Horticultural Sciences, Faculty of Agriculture, University of Zanjan, Zanjan, Iran)
Seyed Najmadin Mortazavi ³ (Assistant Professor, Department of Horticultural Sciences, Faculty of Agriculture, University of Zanjan, Zanjan, Iran.)

تاریخ دریافت : 1395/08/17 تاریخ پذیرش : 1395/12/28 تاریخ انتشار : 1396/09/10

کلید واژه: growth, Electrolyte leakage, Salt stress, Signal molecule, Turfgrass,

چکیده مقاله :

Salinity is one of the greatest environmental challenges facing plant growth and development in the 21st century. Salicylic acid (SA) is a phenolic compound and signal molecule involved in the regulation of plants responses to biotic and abiotic stresses. This greenhouse experiment was conducted to determine effects of SA application on Kentucky bluegrass (Poa pratensis L.) responses to salinity stress. The three salinity levels (0, 40 and 80 mM NaCl) were applied in nutrient solutions, and foliar SA treatments (0, 1 and 2 mM) were applied at 2-weeks intervals. The study was carried out as a factorial experiment based on completely randomized experimental design with four replications. Salinity reduced root and shoot dry weight, visual turf quality, leaf chlorophyll and potassium content, whereas electrolyte leakage, proline and sodium content were increased with salt concentration in nutrient solution. Salicylic acid application ameliorates adverse effects of salinity in all factors and this effect was more pronounced in 80 mM NaCl. In terms of root dry weight, leaf sodium and proline content as well as electrolyte leakage, SA application at 2 mM had better results than 1 mM. These results suggest that further studies are required to find proper SA application rate in different salinity levels.

چکیده انگلیسی:

شوری یکی از بزرگترین چالش­هایی است که رشد و نمو گیاهان را در قرن بیست و یکم تحت تاثیر قرار داده است. سالیسیلیک اسید یک ترکیب فنلی است که به عنوان یک مولکول پیام‌رسان پاسخ­های گیاهان را در برابر تنش­های زیستی و غیر زیستی تنظیم می‌کند. این پژوهش گلخانه‌ای به منظور بررسی اثر سالیسیلیک اسید بر پاسخ­های چمن کنتاکی بلوگراس (Poa pratensis L.) به تنش شوری اجرا شد. سه سطح شوری (0، 40 و 80 میلی‌مولار کلرید سدیم) در محلولهای غذایی اعمال گردید و تیمارهای سالیسیلیک اسید (0، 1 و 2 میلی‌مولار) به صورت محلول پاشی در فواصل دو هفته‌ای انجام شدند. شوری رشد ریشه و شاخساره، کیفیت ظاهری چمن، میزان کلروفیل و پتاسیم برگ­ها را کاهش داد در صورتی­که نشت یونی، محتوای پرولین و سدیم برگ­ها با افزایش غلظت نمک در محلول غذایی افزایش یافت. کاربرد سالیسیلیک ‌اسید در تمامی صفات اثرات منفی شوری را بهبود بخشید و این اثر در تیمار 80 میلی‌مولار نمک چشمگیرتر بود. در صفات رشد ریشه، میزان سدیم، پرولین و نشت یونی برگ­ها، کاربرد 2 میلی‌مولار سالیسیلیک اسید نتیجه بهتری نسبت به 1 میلی‌مولار در بر داشت. این نتایج نشان می‌دهد که مطالعات بیشتر به­منظور یافتن سطح مناسب کاربرد سالیسیلیک اسید در سطوح مختلف تنش شوری مورد نیاز است.

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