تغییرات برخی از ویژگی‌های ریختی و فیزیولوژیک یک رقم کلزا (Brassica napus L.) به تنش آبی خاک
محورهای موضوعی : ژنتیک
حمید نورانی‌آزاد
1
(گروه زیست شناسی دانشگاه آزاد اسلامی واحد جهرم)
محمدرضا حاجی باقری -
2
(دانشگاه آزاد اسلامی واحد استهبان)
کلید واژه: تنش آبی, پرولین, کلزا, کلروفیل, قند محلول,
چکیده مقاله :
به منظور بررسی واکنش‌های مورفولوژیک و فیزیولوژیک یک رقم کلزا با نام طلائیه تحت تنش آبی خاک، آزمایشی در گلخانه دانشگاه آزاد اسلامی واحد جهرم انجام شد. تیمارهای آزمایش شامل پنج سطح رطوبتی، با فاصله 7 (شاهد)، 14، 21، 28 و 35 روز آبیاری با چهار تکرار در قالب طرح کاملا تصادفی مورد بررسی قرار گرفت. تحت سطوح خشکی، و در پایان مرحله رشد، مقادیر وزن خشک گیاه، طول ساقه و ریشه، کلروفیل کل برگ ها، کل قندهای محلول و پرولین گیاه، سدیم و پتاسیم برگ ها اندازه گیری شد. نتایج نشان داد که با افزایش تنش خشکی، مقدار کلروفیل کل و پتاسیم برگ ها نسبت به شاهد کاهش معنی داری یافت. وزن خشک گیاه کاهش و تنها در دو تیمار 28 و35 روز آبیاری نسبت به شاهد معنی دار بود. کاهش طول ساقه به جز در تیمار 14 روز آبیاری نسبت به شاهد معنی دار بود. مقادیر سدیم برگ ها افزایش معنی دار نشان داد. افزایش طول ریشه همراه با افزایش تنش خشکی معنی دار نبود. میزان کل قندهای محلول و پرولین گیاه افزایش یافت. افزایش قندهای محلول و پرولین همراه با افزایش تنش خشکی برای تنظیم اسمولاریته و تحمل به شرایط تنش می‌باشد. کاهش پتاسیم باعث افزایش مقاومت روزنه ای و کاهش فتوسنتز و رشد شد.
In order to study the morphologic and physiologic responses of one Canola cultivar (Talayie) to moisture Stress, a 4- replicate CRD greenhouse experiment was conducted during at the Islamic Azad University of Jahrom. The treatments consisted of five moisture levels with intervals 7(control),14,21,28 and 35 days of irrigation .Total dry weight, stem length and root, total leaf chlorophyll, total soluble sugars and proline, Na+, K+ in leaves were measured at the final leaf growth stage. Results showed that total leaf chlorophyll and K+ significantly decreased in comparison to control. Dry weight decreased with increasing drought stress and significantly decreased in treatments of 28 and 35 day of irrigation in comparison to control. Decrease of stem length, except in treatment of 14 day of irrigation has significant in comparison to control. Na+ in leaves significantly increased with increasing of drought stress. The differences of root length between different treatments were not significant. The total soluble sugars and proline contents increased with increasing of drought stress. The sugars and proline accumulation probably play an important role in the osmoregulation and induction of drought tolerance. Decrease of k+may be lead to stomatal resistance and decreasing of photosynthesis and growth.
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