اثر قارچهای میکوریز آربوسکولار و تنش آبی بر فعالیت برخی آنزیمهای آنتی اکسیدان و جذب عناصر غذای دو پایه مرکبات

نوع مقاله : مقاله کامل

نویسندگان

بخش علوم خاک، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ج. ا. ایران.

چکیده

چکیده- تنش خشکی از مهمترین فاکتورهای کاهش تولید در کشاورزی است زیرا بر تمام فعالیت‌های گیاه اثر دارد. در این پژوهش گلخانه‌ای اثر تنش خشکی و قارچ گلوموس موسه بر روی رشد، جذب عناصر غذایی و انزیم‌های آنتی اکسیدان دو پایه مرکبات ‌نارنج و رافلمون) در خاک استریل بررسی شد. در این مطالعه از سه فاکتور در قالب طرح کاملاً تصادفی با سه تکرار استفاده شد. فاکتور‌ها شامل سه سطح تنش خشکی (‌دور های آبیاری 2، 4، 6 و 8 روز)، میکوریز در 2 سطح ( تلقیح قارچ گلوموس موسه و شاهد) و دوپایه مرکبات ( نارنج و رافلمون) بودند. دانهال‌های میکوریزی دو پایه مرکبات به خوبی توسط قارچ گلوموس موسه کلنیزه شده بودند. با افزایش سطح تنش خشکی درصد کلنیزاسیون ریشه، عملکرد ماده خشک اندام هوایی، جذب نیتروژن، فسفر، منگنز، مس و آهن در اندام هوایی دو پایه مرکبات به طور معنی‌داری کاهش ولی جذب روی اندام هوایی و فعالیت آنزیم‌های آنتی اکسیدان ‌سوپراکسید دسموتاز، کاتالاز، گلوتاتیون پراکسیداز و آسکوربیک پراکسیداز) در برگ در هر دو پایه مرکبات افزایش یافت. با تلقیح دو پایه مرکبات با قارچ در مقایسه با گیاهان بدون قارچ عملکرد ماده خشک اندام هوایی، جذب نیتروژن، فسفر و آنزیم‌های آنتی اکسیدان افزایش یافت. ممکن است قارچ های میکوریز آربوسکولار با افزایش جذب عناصر غذایی  در اندام هوایی و فعالیت آنزیم‌های آنتی اکسیدان برگ  مرکبات اثرات تنش خشکی را تعدیل نماید.

کلیدواژه‌ها

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