اثر نوتری پرایمینگ بذر با سلنیوم بر شاخص های جوانه زنی و فیزیولوژیکی بالنگوی شهری (Lamellia ibrica L.) تحت تنش شوری
محورهای موضوعی : فیزیولوژی و متابولیسم بذر
سید اسماعیل موسوی
1
(دانشگاه شاهد)
مهدی عقیقی شاهوردی
2
(دانشگاه شاهد)
کلید واژه: کاتالاز, سرعت جوانه‌زنی, کلروفیل, پراکسیداز, نوتری‌پرایمینگ,
چکیده مقاله :
به‌منظور ارزیابی اثر پرایمینگ بذر با سلنیوم بر شاخص‌های جوانه‌زنی و فیزیولوژیکی بالنگو تحت تنش خشکی، آزمایشی به‌صورت فاکتوریل در قالب طرح کاملاً تصادفی با سه تکرار در سال 96 در دانشگاه شاهد انجام شد. تیمارهای آزمایشی شامل پنج سطح شوری (صفر، 5/2، 5، 5/7 و 10 دسی‌زیمنس بر متر) و چهار سطح سلنیوم (صفر، 25/0، 5/0 و 1 درصد) بودند. نتایج نشان داد اثر سلنیم و شوری بر شاخص‌های جوانه‌زنی (درصد و سرعت جوانه‌زنی، ضریب جوانه‌زنی، واریانس جوانه‌زنی و یکنواختی جوانه‌زنی) و شاخص‌های فیزیولوژیکی گیاهچه (کلروفیل a، b و کلروفیل کل، کارتنوئید، فعالیت آنزیم‌های کاتالاز و پراکسیداز) معنی‌دار بود. بیشترین درصد جوانه‌زنی در سطوح 25/0 و 5/0 درصد سلنیوم و سطوح صفر و 5/2 دسی‌زیمنس بر متر نمک حاصل شد. شوری رنگیزه‌های گیاهی (کلروفیل a، b و کلروفیل کل) را کاهش داد. میانگین‌های رنگیزه‌های گیاهی در سطح 25/0 درصد سلنیوم نسبت به سایر سطوح سلنیوم در بالاترین سطح بود. در سلنیوم سطح 25/0 درصد ، بالاترین میزان فعالیت آنزیم‌های کاتالاز و پراکسیداز به‌دست آمد و همچنین با افزایش سطح شوری، فعالیت هر دو آنزیم یاد شده افزایش یافت. به‌طور کلی می‌توان نتیجه گرفت در این مطالعه، تیمار 25/0 درصد سلنیوم در کاهش اثرات منفی شوری موثرترین تیمار بود.
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