اثر دما و پتانسیل آب بر جوانه زنی بذر کنجد شیطانی (Cleome viscosa L.): علف هرز مهاجم مزارع سویا استان گلستان

پژوهش های حفاظت گیاهان ایران

مقاله 4، دوره 30، شماره 2، شهریور 1395، صفحه 292-303   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jpp.v30i2.44481

نویسندگان

محبوبه شیردل¹؛ آسیه سیاهمرگویی^{* 2}؛ معصومه یونس آبادی³

¹دانشگاه آزاد اسلامی واحد گرگان

²دانشگاه علوم کشاورزی و منابع طبیعی گرگان

³مرکز تحقیقات کشاورزی استان گلستان

چکیده

به منظور بررسی اثر دما و پتانسیل آب بر جوانه‌زنی بذر و تعیین دماهای کاردینال جوانهزنی بذور کنجد شیطانی (Cleome viscose L.)، آزمایشی بهصورت فاکتوریل در قالب طرح پایه کاملاً تصادفی در چهار تکرار در مرکز تحقیقات کشاورزی و منابع طبیعی استان گلستان در سال 1392 اجرا گردید. تیمارهای آزمایشی شامل دما در 7 سطح (15، 20، 25، 30، 35 ، 38 و 40 درجه سانتی گراد) و پتانسیل‌آب در6 سطح (0، 2-، 4-، 6-،8- و 10- بار) بودند. نتایج نشان داد که با افزایش دما تا 30 درجه سانتی گراد، درصد و سرعت جوانه‌زنی روند افزایشی و بعد از آن روند کاهشی داشت. با کاهش پتانسیل آب درصد و سرعت جوانه زنی بذر کنجد شیطانی روند کاهشی داشت. مقایسه مدلهای مختلف در تعیین دماهای کاردینال جوانهزنی، نشان داد که مدل دوتکهای توصیف بهتری در تغییرات سرعت جوانهزنی در برابر دما داشت. بر اساس خروجی این مدل، دمای پایه، مطلوب و سقف جوانهزنی این گیاه در شرایط بدون تنش به ترتیب 46/15، 21/30 و 64/39 درجه سانتیگراد برآورد شد. نتایج نشان داد که در محدوده دمای مطلوب، امکان جوانه‌زنی بذور کنجد شیطانی در پتانسیل‌های کمتر آب وجود خواهد داشت.

کلیدواژه‌ها

دماهای کاردینال جوانه زنی؛ رگرسیون غیرخطی؛ کنجد شیطانی

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