واکنش گیاه همیشه بهار (Calendula officinalis L.) به آسکوربیک اسید و براسینواستروئید در شرایط تنش خشکی
الموضوعات :
اکوفیزیولوژی گیاهان زراعی
خاطره همتی
1
(دانشجوی دوره دکتری زراعت، دانشکده کشاورزی، دانشگاه محقق اردبیلی، اردبیل، ایران)
علی عبادی
2
(استاد گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، دانشگاه محقق اردبیلی، اردبیل، ایران.)
سعید خماری
3
(استادیار گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، دانشگاه محقق اردبیلی، اردبیل، ایران.)
محمد صدقی
4
(عضو هیئت علمی گروه شیمی، واحد اردبیل، دانشگاه آزاد اسلامی، اردبیل، ایران.)
تاريخ الإرسال : 23 الثلاثاء , رمضان, 1437
تاريخ التأكيد : 18 الأربعاء , ذو الحجة, 1439
تاريخ الإصدار : 12 الخميس , ذو الحجة, 1439
الکلمات المفتاحية:
لیزین,
رنگدانه های فتوسنتزی,
پلی فنل اکسیداز,
متیونین و همیشه بهار,
ملخص المقالة :
تاثیر تنش کم آبیـاری، براسینواستروئید و آسکوربیک اسید بر رنگیزه های فتوسنتزی و برخی از متابولیت های سازگاری گل همیشه بهار طی آزمایشی در مزرعه تحقیقاتی و آزمایشگاه دانشگاه محقق اردبیلی در سال 1393 بررسی گردید. آزمایش به صورت اسپلیت فاکتوریل در قالب طرح بلوک های کامل تصادفی در سه تکرار اجرا شد. تیمار تنش کم آبیاری در دو سطح (50 میلی متر تبخیر از تشتک تبخیر (شاهد) و 100 میلی متر تبخیر از تشتک تبخیر (تنش کم آبیاری)) به عنـوان عامل اصلی و تیمارهای براسینواستروئید (7-10، 8-10 و صفر مولار) و آسکوربیک اسید ( 10 میلی مولار و صفر (شاهد)) نیز به صورت فاکتوریل به عنوان عوامل فرعی در نظرگرفته شدند. نتایج نشان داد که تنش کم آبیاری، کاربرد براسینواستروئید و آسکوربیک اسید موجب افزیش درصد اسانس، کربوهیدرات، کاروتنوئیدها و فعالیت آنزیم پلی فنل اکسیداز شد. همچنین، تنش آبی، میزان کلروفیل a، b، کلروفیل کل، لیزین و متیونین را کاهش داد. با این حال، کاربرد براسینواستروئید و آسکوربیک اسید توانست آسیب های ناشی از تنش را تخفیف داده و میزان کلروفیل های a، b و کل را افزایش دهد. کاربرد آسکوربیک اسید در شرایط تنش به جلوگیری از کاهش بیشتر لیزین و متیونین کمک کرد. با توجه به این نتایج، به نظر می رسد استفاده از آسکوربیک اسید و براسینواستروئید با کمک به سیستم دفاعی از تخریب کلروفیل ها جلوگیـری کرده و موجب افزایش تحمل به تنش خشکی شـده است. همچنین، به نظر می رسد کاربرد براسینواستروئید می تواند در بهبود خاصیت دارویی همیشه بهار مؤثر گردد.
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