تاثیر کاربرد محلول پاشی عتاصر روی و آهن روی گیاه مادری کینوا تحت تنش کم‌آبی بر جوانه زنی و رنگیزه های فتوسنتزی بذور حاصل از آن
محورهای موضوعی : تنش های محیطی
نسیم پاکباز
1
,
حشمت امیدی
2
,
حسنعلی نقدی بادی
3
,
امیر بستانی
4
1 - دانشجوی دکتری فیزیولوژی گیاهان زراعی-دانشگاه شاهد. تهران- ایلام
2 - دانشگاه شاهد
3 - دانشگاه شاهد
4 - گروه خاکشناسی-دانشگاه شاهد
کلید واژه: محلول پاشی, تنش کم‌آبی, خصوصیات جوانه‌زنی, کینوا, گیاه مادری,
چکیده مقاله :
تنش خشکی در طول رشد و گلدهی یکی از مهم‌ترین محدودیت‌های محیطی است که بر تشکیل دانه و در نتیجه جوانه‌زنی و مراحل اولیه رشد گیاهان تأثیر می‌گذارد. در این مطالعه تأثیر محلول‌پاشی ریزمغذی‌ها (شاهد، آهن ،روی، آهن + روی ، نانوآهن ، نانوروی ، نانوآهن + نانوروی) بر روی کینوا در دو مرحله گلدهی(50 درصد و 100 درصد) تحت دو سطح تنش، شاهد (045/03±0/0-) بار و تنش کم‌آبی (045/9±0-) بار مورد ارزیابی قرار گرفتند. نتایج نشان داد که صفات جوانه‌زنی شامل درصد، سرعت، میانگین زمان جوانه زنی، یکنواختی جوانه‌زنی، شاخص طولی و وزنی گیاهچه و همچنین محتوای کلروفیل و کارتنویید به‌طور معنی‌داری تحت تأثیر محلول‌پاشی ریزمغذی‌ها، زمان محلول‌پاشی و سطوح تنش کم‌آبی قرار گرفتند. تنش کم‌آبی باعث کاهش درصد و سرعت جوانه‌زنی و شاخص‌های گیاهچه‌ای شد، اما محلول‌پاشی ریزمغذی‌ها اثرات نامطلوب تنش محلول‌پاشی ریزمغذی‌ها را کاهش داد. محلول‌پاشی ریزمغذی‌ها همچنین میزان رنگدانه‌های فتوسنتزی را کاهش داد. یافته‌های این تحقیق نشان می‌دهد که محلول‌پاشی با عناصر غذایی به ویژه نانو آهن + نانو روی باعث افزایش شاخص‌های جوانه‌زنی برای بهبود جوانه‌زنی و رشد گیاهچه‌های کینوا در شرایط تنش کم‌آبی می‌گردد.
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