اثر تنش خشکی بر تجمع پرولین، قندهای محلول و تغییرات عناصر سدیم و پتاسیم در ژنوتیپ¬های لوبیا سفید
محورهای موضوعی : توليد محصولات زراعي
مسعود زاده باقری
1
(دانشگاه آزاد اسلامی، واحد شیراز، گروه علوم باغبانی، شیراز، ایران )
کلید واژه: پرولین, تنش خشکی, قندهای محلول, لوبیا سفید, سدیم, پتاسیم,
چکیده مقاله :
به منظور بررسی برخی از تغییرات فیزیولوژیک، آزمایشی به صورت کرت¬های خرد شده در قالب طرح پایه بلوک¬های کامل تصادفی در 3 تکرار در مزرعه تحقیقاتی دانشگاه آزاد اسلامی واحد شیراز به اجرا در آمد. فاکتور اول دو سطح آبیاری (آبیاری نرمال و تنش خشکی) و فاکتور دوم شامل سه ژنوتیپ¬ لوبیا سفید (دانشکده، شکوفا و G11867) بود، که بر اساس شاخص های مورفولوژیک به ترتیب به عنوان حساس، نیمه متحمل و متحمل دسته بندی شده بودند. در مرحله 50 درصد گل¬دهی نمونه برداری انجام شد و میزان قندهای محلول، محتوای پرولین و عناصر سدیم و پتاسیم اندازه¬گیری گردید. نتایج آزمایش نشان داد که غلظت قندهای محلول، محتوای پرولین و یون پتاسیم در اثر تنش خشکی افزایش و یون سدیم کاهش یافت. ژنوتیپ متحمل G11867 بیشترین میزان قندهای محلول و یون سدیم را دارا بود. ژنوتیپ حساس دانشکده از بیشترین میزان یون پتاسیم و پرولین برخوردار بود. نتایج آزمایش نشان داد که تجمع بیشتر پتاسیم و محتوای پرولین لوبیا در شرایط خشکی می تواند یک سازگاری برای تحمل به خشکی باشد که به بقاء و تولید در شرایط خشکی کمک می کند.
To assess some of the physiological changes, an experiment in the form of split plots and complete randomized blocks was performed in three replications in the research fields of the Islamic Azad university of Shiraz. The firs factor was irrigation level (normal and drought stress) and the second factor included white bean genotypes, (Daneshkadeh shekoofa and G11867), which were categorized as sensitive, semi-tolerant and tolerant dehiscent based on morphological indices. Samples were taken in the 50% flowering stage and the amounts of soluble glucose, proline content, sodium and potassium were measured. The results of the experiment showed that the soluble solution density, proline content and potassium ion increased under stress and the amount of sodium ion decreased. The G11867 dehiscent genotype had the highest amount of soluble glucose and sodium ion. The Daneshkadeh sensitive genotype had the highest amount of potassium ion and proline content. The results indicated that the accumulation of excess potassium and proline content in beans under drought stress can create a kind of adaptation for the plant against drought and help production under these conditions.
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