تاثیر غلظت‌های مختلف نیترات پتاسیم بر خصوصیات فیزیولوژیکی و بیوشیمیایی ذرت (Zea mays L.) تحت شرایط تنش شوری
الموضوعات :
هما زارعی
1
(دانش آموخته کارشناسی‌ارشد علوم و تکنولوژی بذر دانشگاه محقق اردبیلی، اردبیل، ایران)
محمد صدقی
2
(استاد گروه علوم و مهندسی تولید و ژنتیک گیاهی، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل، ایران.)
سلیم فرزانه
3
(دانشیار گروه تولید و ژنتیک گیاهی، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل، ایران)
هانیه سعادت
4
(دانش آموخته دکتری اکولوژی گیاهان زراعی دانشگاه محقق اردبیلی، اردبیل، ایران)
الکلمات المفتاحية: آنزیم‌های آنتی‌اکسیدانت, پرایمینگ, کلرید سدیم, نیترات پتاسیم,
ملخص المقالة :
به‌منظور بررسی اثر پرایمینگ با غلظت‌های مختلف نیترات پتاسیم بر روی خصوصیات فیزیولوژیکی و بیوشیمیایی ذرت تحت تنش شوری، آزمایشی به‌صورت فاکتوریل در قالب طرح کاملا تصادفی در سه تکرار در دانشگاه محقق اردبیلی در سال 1401 اجرا گردید. تیمارها شامل سه سطح مختلف شوری با غلظت‌های صفر، 100 و ۲۰۰ میلی‌مولار و سطوح مختلف محلول نیترات پتاسیم با غلظت‌های صفر، 5/1 و ۳ درصد بود. نتایج نشان داد که بیشترین درصد جوانه‌زنی، سرعت جوانه‌زنی، یکنواختی جوانه‌زنی، طول ریشه‌چه و ساقه‌چه، وزن تر و خشک ریشه‌چه و ساقه‌چه در پرایمینگ با نیترات پتاسیم 3 درصد و بدون شوری حاصل شد. میانگین مدت جوانه‌زنی 53 درصد نسبت به شاهد کاهش نشان داد. فعالیت آنزیم‌های کاتالاز، پراکسیداز و سوپراکسیددیسمیوتاز در پرایمینگ با نیترات پتاسیم 3 درصد و شوری 200 میلی‌مولار نسبت به شاهد به‌ترتیب 56، 68 و 67 درصد افزایش نشان دادند. شوری موجب کاهش فعالیت آنزیم آمیلاز شد، ولی پرایمینگ با نیترات پتاسیم فعالیت این آنزیم را افزایش داد. محتوای کل پروتئین بذر در پیش تیمار نیترات پتاسیم 3 درصد و بدون شوری حدود 63 درصد افزایش داشت. به‌طور کلی، پرایمینگ با محلول نیترات پتاسیم 3 درصد را می‌توان به‌عنوان مناسب‌ترین تیمار برای بهبود خصوصیات فیزیولوژیکی و بیوشیمیایی ذرت تحت تنش شوری در نظر گرفت.
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