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مرجان دیانت

چکیده

جوانه¬زنی بذر در مدیریت علف¬های هرز فرآیندی کلیدی است بطوری‌که می¬تواند بر تعداد علف¬های هرز سبز شده و زمان سبز شدن آنها تعیین کننده باشد. تاج خروس خزنده و خوابیده از جمله علف¬های هرز مهم سبزیجات و گیاهان زراعی تابستانه در ایران هستند. به منظور ارزیابی اثر دما بر جوانه¬زنی این دو علف هرز، آزمایشی در قالب طرح کاملا تصادفی و با 4 تکرار در دانشگاه آزاد اسلامی- واحد علوم و تحقیقات در سال 1394 انجام شد. بذور با دماهای 5، 10، 15، 20، 25، 30، 35، 40 و 45 درجه سانتی‌گراد تیمار شدند. با توجه به مدل خطوط متقاطع دماهای پایه، بهینه و بیشینه به ترتیب در تاج خروس خزنده 37/14، 21/34 و 50/44 و در تاج خروس خوابیده 24/14، 65/31 و 20/44 درجه سانتی‌گراد به دست آمدند. در آزمایشی دیگر 7 سطح پتانسیل اسمزی (0، 2/0-، 4/0-، 6/0-، 8/0- و 1- مگاپاسکال) مورد بررسی قرار گرفتند. به منظور ارزیابی پتانسیل سطوح مختلف تنش خشکی در کاهش درصد جوانه¬زنی بذر از مدل سیگموئید سه پارامتری استفاده شد. به طور کلی مقادیر x50 (پتاسیل لازم برای کاهش 50 درصدی جوانه¬زنی) به دست آمده برای تاج خروس خوابیده نسبت به تاج خروس خزنده کمتر بود. تاج خروس خزنده در پتانسیل 1- مگاپاسکال توانست 25/9 درصد جوانه زند ولی در این پتانسیل تاج خروس خوابیده جوانه نزد که نشان دهنده تحمل بالاتر تنش خشکی توسط این گونه بود. با توجه به داده¬های به دست آمده هر دو گونه می¬توانند در اقلیم¬های نیمه گرم و گرم جوانه زنند. تحمل هر دو گونه نسبت به تنش خشکی بالا بود اما تاج خروس خزنده تحمل بالاتری داشته و بنابراین پتانسیل تهاجم بیشتری به مناطق خشک دارد.

جزئیات مقاله

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ارجاع به مقاله
دیانتم. (۱۳۹۶-۱۰-۱۲). تأثیر دما و تنش خشکی بر جوانه¬زنی بذر تاج خروس خزنده (Amaranthus viridis L.) و خوابیده (Amaranthus blitoides S. Watson). مطالعات حفاظت گیاهان, 31(4), 690-699. https://doi.org/10.22067/jpp.v31i4.61569
نوع مقاله
علمی - پژوهشی

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