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علی شایان فر فرشید قادری فر رحمت الله بهمرام افشین سلطاني حمیدرضا صادقی پور

چکیده

بذرهای کلزا پس از ریزش در بانک بذر خاک، کمون ثانویه در آنها القا می¬شود. در فصل زراعی بعد با رفع کمون آنها، تهدیدی برای گیاهان زراعی بعد درنتیجه تظاهر کلزای خودرو خواهند بود. در این مطالعه بذرهای با سطوح کمون ثانویه کم (Gor-H-4 و Gor-O-16)، متوسط (زرفام و RGS003) و زیاد (Gor-O-4 و Gor-O-6) کلزا ابتدا در معرض شرایط القای کمون ثانویه و سپس تحت تیمارهای مختلف دما و نور قرار گرفتند. پس از القای کمون ثانویه، حداکثر درصد جوانه¬زنی در بذرهای با کمون کم در دمای ثابت در تاریکی و نور ثبت گردید و کاهش درصد کمون ثانویه در بذرهای با سطوح کمون متوسط با افزایش دما از 20 به 30 درجه سانتی¬گراد در تاریکی مشاهده شد که روند کاهشی بیشتری را در تیمار نور نشان داد. در بذرهای با سطوح کمون بالا، روند کاهشی مشابه با بذر کمون متوسط در تاریکی و نور بود، اما در بذر با کمون بالا (Gor-O-6) بیشتر ناشی از پاسخ آنها به افزایش دما و در دیگری (Gor-O-4) بیشتر متأثر از پاسخ به نور بود. رفع کامل کمون ثانویه بذرهای با کمون بالا، در تیمار 3-30 درجه سانتی‌گراد در تاریکی بیانگر جایگزین شدن دمای متناوب با نیاز نوری آنها بود، اما عدم رفع کامل کمون در تیمار 20-30 درجه سانتی¬گراد نشان دهنده رفع کمون برخی از بذرها توسط دمای متناوب و نیاز نوری کسری از بذرها به نور است. نتایج حاکی از فتوبلاستیک شدن بذرهای کلزا پس از القای کمون است که بر نقش فیتوکروم¬ها بر رفع کمون ثانویه بذر کلزا اشاره دارد.

جزئیات مقاله

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ارجاع به مقاله
شایان فرع., قادری فرف., بهمرامر. ا., سلطانيا., & صادقی پورح. (۱۳۹۷-۰۲-۳۰). نقش دما و نور بر جوانه¬زنی و کمون ثانویه بذر کلزای (Brassica napus L.) خودرو. مطالعات حفاظت گیاهان, 32(2), 269-278. https://doi.org/10.22067/jpp.v32i2.64985
نوع مقاله
علمی - پژوهشی

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