تغییرات سیستم‌های پاداکساینده در انواع برگ‌های رنگی شمشاد طلایی (Euonymus japonicus Thunb.)

الموضوعات :

نادر چاپارزاده ¹ , سمانه صفی خانی ² , لیلا زرندی میاندوآب ³

1 - گروه زیست‌شناسی، دانشگاه شهید مدنی آذربایجان، تبریز، ایران
2 - گروه زیست‌شناسی، دانشگاه شهید مدنی آذربایجان، تبریز، ایران
3 - گروه زیست‌شناسی، دانشگاه شهید مدنی آذربایجان، تبریز، ایران

تاريخ الإرسال : 27 الأربعاء , ربيع الثاني, 1438 تاريخ التأكيد : 02 الأحد , رمضان, 1438 تاريخ الإصدار : 22 الثلاثاء , جمادى الثانية, 1438

الکلمات المفتاحية: پراکسیداز, پراکسید هیدروژن, شمشاد, ترکیبات فنلی, اکسیداتیو,

ملخص المقالة :

برخی نشانگرهای فیزیولوژیکی و پاسخ های آنتی اکسیدان در انواع برگ های رنگی درختچه ‍زینتی همیشه سبز شمشاد طلایی (Euonymus japonicus Thunb.) مورد مطالعه قرار گرفت. این درختچه دارای سه نوع برگ به رنگ های سبز تیره، سبز روشن و زرد می باشد. در این سه نوع برگ نشانگرهای تنش اکسیداتیو (غلظت پراکسید هیدروژن، پایداری غشاهای سلولی و پراکسیداسیون چربی ها)، فعالیت آنزیم پراکسیداز و برخی ترکیبات آنتی اکسیدان (ترکیبات فنلی، پرولین و اسیدهای آمینه آزاد) مطالعه شدند. نوع برگ بر محتوای پراکسید هیدروژن، میزان پایداری غشاهای سلولی و پراکسیداسیون چربی های غشایی تاثیر معنی دار گذاشت. مقدار اسیدهای آمینه آزاد و پرولین در برگ های زرد به شکل معنی داری از برگ های سبز تیره و روشن بیشتر بود. بیشترین و کمترین مقدار ترکیبات فنولی آزاد به ترتیب در برگ های سبز تیره و زرد وجود داشت. یک الگوی افزایش فعالیت آنزیم پراکسیداز در برگ های سبز روشن نسبت به سبز تیره و برگ های زرد نسبت به برگ های سبز روشن مشاهده شد. از داده های حاضر می توان نتیجه گرفت که با وجود فعالیت سیستم های آنتی اکسیدان، تغییر رنگ برگ ها از سبز تیره تا زرد منجر به افزایش آسیب های اکسیداتیو می شود.

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