تأثیر تنش خشکی بر برخی خصوصیات مورفوفیزیولوژیکی و فیتوشیمیایی مرزنجوش بخارایی (Origanum vulgare L. ssp. gracile)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه ارومیه، ارومیه، ایران

2 استاد، گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه ارومیه، ارومیه، ایران

3 استاد، مرکز تحقیقات ریزفناوری دارویی، دانشکده داروسازی، دانشگاه علوم پزشکی تبریز، تبریز، ایران

4 دانشیار، گروه مهندسی آب، دانشکده کشاورزی، دانشگاه ارومیه، ارومیه، ایران

چکیده

شناسه دیجیتال (DOR):
98.1000/1735-0905.1398.35.252.94.2.1578.41

به‌منظور بررسی اثر سطوح مختلف تنش خشکی بر رشد، عملکرد و برخی خصوصیات فیزیولوژیکی و فیتوشیمیایی گیاه مرزنجوش بخارایی (Origanum vulgare L. ssp. gracile)، آزمایشی گلدانی در قالب طرح کاملاً تصادفی با چهار تیمار و پنج تکرار انجام گردید. تیمارهای تنش خشکی شامل چهار سطح 100% (بدون تنش)، 80%، 60% و 40% ظرفیت زراعی بودند. نتایج نشان داد که تنش خشکی تأثیر معنی‌داری بر مؤلفه‌های رشدی، عملکرد ماده خشک، محتوی نسبی آب برگ (RWC)، فنل کل، فلاونوئید کل، فعالیت آنتی‌اکسیدانی، کلروفیل a، b و کلروفیل کل و درصد و عملکرد اسانس دارد. از نظر مقدار کاروتنوئید اختلاف معنی داری بین تیمارهای مختلف وجود نداشت. با کاهش مقدار آب خاک، ارتفاع بوته، قطر ساقه، تعداد و طول شاخه‌های جانبی، عملکرد ماده خشک، RWC، کلروفیل a، b و کلروفیل کل و عملکرد اسانس کاهش و در مقابل میزان فنل و فلاونوئید کل، فعالیت آنتی‌اکسیدانی و درصد اسانس افزایش یافت. علیرغم کاهش عملکرد ماده خشک، اختلاف بین تیمارهای 80%، 60% و 40% ظرفیت زراعی معنی‌دار نبود. بیشترین درصد اسانس (54/1 میلی‌لیتر در صد گرم ماده خشک) در تیمار 60% ظرفیت زراعی و بیشترین مقدار فنل کل (21/5 میلی‌گرم گالیک اسید در گرم ماده تر)، فلاونوئید کل (5/0 میلی‌گرم کوئرستین در گرم ماده تر) و فعالیت آنتی‌اکسیدانی (36/77%) در تیمار 40% ظرفیت زراعی مشاهده شد.

کلیدواژه‌ها


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