تأثیر سطوح مختلف شوری در فراسنجه‌های فیزیولوژیکی برخی پایه‌های پیوندی گلابی

نوع مقاله : مقاله پژوهشی

نویسنده

استاد، بخش تحقیقات باغبانی، مؤسسۀ تحقیقات اصلاح و تهیۀ نهال و بذر، کرج

چکیده

به‌منظور تعیین تأثیر سطوح مختلف شوری (شاهد با هدایت الکتریکی 8/0، 6/1، 4/2، 2/3 و 4 دسی‌زیمنس بر متر) با استفاده از نمک کلرور سدیم روی فراسنجه (پارامتر)های فیزیولوژیکی و شاخص‌های رشد (طول و قطر) در سه رقم دره گزی، لوییزبون و ویلیام دوشس که روی پایه‌های گلابی بذری، OHF69 و Pyrodwarf پیوند شده بودند. پژوهشی در قالب طرح آماری بلوک‌های کامل تصادفی به‌صورت فاکتوریل و در کشت گلدانی مستقر در باغ تحقیقاتی کمال‌آباد کرج در سال 1394 به اجرا گذاشته شد. در این پژوهش برای صفات مورد بررسی از شاخص‌های مختلف حساسیت و تحمل به تنش شوری استفاده شد. در نهایت با استفاده از شاخص میانگین رتبه‌بندی و انحراف معیار بر مبنای همۀ شاخص‌های اندازه‌گیری‌شده، حساس‌ترین و متحمل‌ترین نهال به شوری معرفی شد. نتایج نشان داد که در بین صفات مورد بررسی روند کاهشی سبزینه (کلروفیل) یا ارزش SPAD با افزایش شوری بیشتر از دیگر صفات (20درصد کاهش در شرایط شور) بود. در بین نهال‌های مورد بررسی، در شرایط شور نهال پیوندی لوییزبون× بذری برتری نسبی از نظر طول، قطر تنه، FV/FM و میزان سبزینه یا ارزش SPAD در مقایسه با دیگر نهال­ها نشان داد. همچنین نهال لوییزبون× پیرودوارف در شرایط شور، کاهش بیشتری در فراسنجه‌های طول و قطر تنه، سطح برگ، FV/FM و سبزینه یا ارزش SPAD مقایسه با دیگر نهال­ها نشان داد. در این پروژه نهال لوییزبون*بذری به عنوان متحمل ترین و نهال لوییزبون× پیرودوارف به عنوان حساس ترین نهال به شوری شناخته شدند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The effect of salinity on physiological aspects of some grafted-pear rootstocks

نویسنده [English]

  • Mitra Mirabdulbaghi
Professor, Seed and Plant Improvement Institute, Karaj, Iran
چکیده [English]

In order to determine the effect of different levels of salinity (EC=1.6, 3.2, 4 and 0.8 dS/m as  control) using sodium chloride on physiological parameters  and also some growth indices in the three grafted-pear rootstocks (OHF69, pyrodwarf and one seedling rootstock) in grafting with Daregazi, Louise Bonne and William Duchesse scions, a pot experiment was carried out as factorial arrangement based on randomized complete block design with three replications in Horticulture research station of Kamalabad/Karaj in spring of 2015. In the present work, different indices of susceptibility and tolerance for all studied parameters were identified and also rank mean (Ṝn) and standard deviation of ranks (SDR) of all mentioned parameters were measured. Results of this study showed that among all studied parameters the reduction of chlorophyll or SPAD value (20% reduction in saline conditions) was higher than other parameters. Among all grafted-pear rootstocks, seedling rootstock in grafting with Louise bonne showed comparative advantage in terms of length, diameter, FV/FM and the amount of chlorophyll or SPAD value compared to other grafted-pear rootstocks. Also, pyrodwarf rootstock in grafting with Louise bonne showed in saline conditions, further reducing the parameters of length, diameter, leaf area, Fv/Fm and chlorophyll or SPAD value compared to other grafted-pear rootstocks. In the present work, seedling rootstock in grafting with Louise Bonne was identified as the most salt tolerant between studied grafted-pear rootstocks, while pyrodwarf rootstock in grafting with Louise Bonne as the most sensitive.

کلیدواژه‌ها [English]

  • Grafted-pear rootstocks
  • physiological parameters
  • salinity
  • tolerance indices
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