نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشگاه تهران
2 دانشگاه تهران. پردیس ابوریحان
چکیده
هدف از این پژوهش کمی‌سازی تأثیر خفتگی ثانویه بر سبزشدن کلزا با استفاده از مدل چاپمن-ریچاردز تحت شرایط مزرعه‌ای بود. این آزمایش با استفاده از 20 ژنوتیپ کلزای تحت شرایط مزرعه‌ای انجام شد. جهت القای خفتگی ثانویه، روش استاندارد هاهنهایم مورد استفاده قرار گرفت. آزمایش سبزشدن شدن نیز و با استفاده از یک طرح فاکتوریل در قالب بلوک‌های کاملا تصادفی در مزرعه تحقیقاتی پردیس ابوریحان دانشگاه تهران با 4 تکرار و به مدت 122 روز انجام شد. نتایج حاصل از این تحقیق نشان داد هردو عامل ژنوتیپ و تنش خشکی بر درصد و سرعت سبزشدن گیاهچه‌های کلزا تحت شرایط مزرعه مؤثر بودند. با این‌حال پتانسیل القای خفتگی ثانویه در بین ژنوتیپ‌ها متفاوت بود و در ژنوتیپهای کرج2، اچ50 و اس ال ام046 سرعت سبزشدن پیش از القاء خقتگی ثانویه 407/0، 143/0 و 355/0 (بر روز) بود که پس از القای خفتگی به ترتیب به 411/0، 289/0 و 364/0 (بر روز) افزایش پیدا کرد. نتایج مقایسه میانگین نشان داد که بیشترین درصد سبزشدن در شرایط عدم وجود خفتگی ثانویه مربوط به ژنوتیپ احمدی بود، ولی این ژنوتیپ با سایر ژنوتیپ‌ها (هایولا، مغان، اس‌ال‌ام046، آرجی‌اس، اپرا و کرج1) تفاوت معنی‌داری نداشت و هنگامی که خفتگی ثانویه به بذور القاء شد نیز ژنوتیپ احمدی بیشترین درصد سبزشدن را داشت و کمترین درصد سبزشدن پس از القاء خفتگی نیز مربوط به ژنوتیپ طلایه بود.
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