اثر پیش‌تیمار پلی اتیلن گلیکول و ملاتونین بر مقاومت به سرما در نشاء خربزه خاتونی (Cucumis melo L.)

علوم باغبانی

مقاله 10، دوره 34، شماره 3 - شماره پیاپی 47، آذر 1399، صفحه 481-491   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jhorts4.v34i3.84236

نویسندگان

حسین نستری نصرآبادی^{* 1}؛ سید فرهاد صابرعلی²

¹مجتمع آموزش عالی کشاورزی و دامپروری تربت جام

²مجتمع اموزش عالی کشاورزی و دامپروری تربت جام

چکیده

سرما از جمله تنش­های محیطی است که باعث بروز آسیب­های فیزیولوژیکی به سلول­های گیاهان حساس می­شود. برای این منظور اثر پیش‌تیمار خشکی و کاربرد ملاتونین در جهت تحمل به سرما در نشاهای خربزه مورد بررسی قرار گرفت. تیمارهای آزمایش شامل سه سطح تنش خشکی (شاهد، 10 و 20 درصد پلی اتیلن گلیکول)، دو سطح ملاتونین (شاهد و 200 میکرو مولار) و دو سطح دمایی (شاهد و تنش سرما) بودند. نتایج نشان داد که با اعمال پیش تیمار خشکی گیاهان از محتوای پرولین بالاتری برخوردار بوده و همچنین با حفظ رطوبت نسبی، تنش دمای پایین را بهتر تحمل نمودند. بالاترین مقدار کلروفیل  در تیمار بدون تنش خشکی، کاربرد ملاتونین و عدم تنش سرما به دست آمد. کاربرد ملاتونین بطور معنی­داری باعث افزایش 98/1 درصد رطوبت نسبی و 60/26 درصد محتوای قند نسبت به شاهد گردید. مشخص گردید کاربرد ملاتونین باعث افزایش معنی­دار ترکیبات فنلی تحت شرایط تنش شد و میزان نشت یونی بطور معنی­داری کاهش یافت. بطور کلی نتایج نشان داد که پیش تیمار خشکی و کاربرد ملاتونین بطور موثری می­تواند از خسارت ناشی از دمای پایین در مراحل اولیه رشد خربزه جلوگیری کند.

کلیدواژه‌ها

پرولین؛ پلی اتیلن گلیکول؛ رطوبت نسبی؛ ملاتونین؛ نشت یونی

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