مطالعه تاثیر تنش سرما بر برخی صفات مورفولوژیک و فیزیولوژیک دانهال کدو حلوایی (Cucurbita moschata L.) تحت محلول‌پاشی ترکیبات مقاومت به سرما

نوع مقاله : مقاله پژوهشی


1 استاد گروه زراعت، دانشگاه ارومیه، گروه زراعت، ارومیه

2 دانشجوی دکتری زراعت، دانشگاه ارومیه، گروه زراعت، ارومیه

3 دکتری زراعت، دانشگاه ارومیه، گروه زراعت، ارومیه


به‌منظور بررسی اثر ترکیبات مقاومت به سرما بر میزان رنگ‌دانه‌های کلروفیل، هدایت الکتریکی، وزن خشک و طول گیاهچه در گیاه کدو (Cucurbita moschata L.) تحت تنش سرما، آزمایشی در سال 1396 در گلخانه تحقیقاتی دانشکده کشاورزی دانشگاه ارومیه، به‌صورت فاکتوریل در قالب طرح پایه‌ی بلوک‌های کامل تصادفی با سه تکرار انجام شد. فاکتور اول شامل محلول‌پاشی 0.25، 0.5 میلی‌مولار اسیدسالیسیلیک، آرمان 3(با غلظت 1:20 لیتر در لیتر) و آب مقطر (به‌عنوان شاهد)، فاکتور دوم تنش دمایی (سرما) شامل دماهای 1-، 1، 3، 5 و 7 درجه سانتی‌گراد بود. صفات موردبررسی شامل کلروفیل، شاخص کلروفیل، میزان نشت یونی، وزن خشک گیاهچه (وزن خشک ریشه و اندام هوایی)، طول گیاهچه (ریشه‌ و بخش هوایی) بود. نتایج نشان داد، در تیمار دما و در دمای 1- درجه سانتی‌گراد میزان کلروفیل b، شاخص کلروفیل، وزن گیاهچه، طول گیاهچه نسبت به شاهد (7 درجه سانتی‌گراد) به ترتیب %48، 47%، 45% و 25% کاهش یافت. اثر متقابل تنش سرما و محلول‌پاشی در کلروفیل a، نشت یونی و وزن خشک ریشه معنی‌دار بود. با اعمال تنش دمایی میزان نشت الکترولیت افزایش و محتوی کلروفیل کاهش یافت، اما اعمال ترکیبات مقاومت به سرما از طریق حفظ محتوی کلروفیل و غشا سلولی، شدت واکنش‌های تخریبی را کاهش داد.


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