ارزیابی شاخص های تحمل به تنش کمبود آب در هیبریدهای ذرت

اکوفیزیولوژی گیاهان زراعی

مقاله 1، دوره 9، 4(36) زمستان، دی 1394، صفحه 503-520   

نوع مقاله: علمی پژوهشی

نویسندگان

جمیله سیدزوار¹؛ مجید نوروزی^{* 2}؛ سعید اهری‌زاد³

¹دانش آموخته ی کارشناسی ارشد زراعت و اصلاح نباتات دانشکده کشاورزی دانشگاه ارومیه، ارومیه، ایران

²استادیار گروه به‌ن‍‍ژادی و بیوتکنولوژی گیاهی، دانشکده کشاورزی، دانشگاه تبریز، تبریز، ایران

³دانشیار گروه به‌ن‍‍ژادی و بیوتکنولوژی گیاهی، دانشکده کشاورزی، دانشگاه تبریز، تبریز، ایران

چکیده

به ­منظور بررسی واکنش 14 هیبرید ذرت به سطوح مختلف تنش کمبود آب از نظر شاخص ­های تحمل به تنش، در سال زراعی 1389 آزمایشی به­ صورت کرت­ های خرد شده در قالب طرح پایه بلوک­ های کامل تصادفی با چهار تکرار در ایستگاه تحقیقاتی دانشکده کشاورزی دانشگاه تبریز اجرا شد. کرت­ های اصلی شامل سطوح مختلف آبیاری (شاهد، تنش ملایم و تنش شدید) و کرت­ های فرعی دربرگیرنده هیبریدهای مورد ارزیابی بود. پنج شاخص تحمل به تنش برای صفت عملکرد دانه محاسبه شدند. در شرایط تنش ملایم کمبود آب از نظر شاخص­ های تحمل (TOL) و حساسیت به تنش کمبود آب (SSI)، هیبریدهای SC702، SC500 و K3647×K18 و در شرایط تنش شدید از نظر همین شاخص ­ها، هیبرید SC500 به ­عنوان متحمل­ ترین هیبریدها شناخته شدند. از نظر شاخص ­های تحمل به تنش (STI)، میانگین هندسی عملکرد (GMP) و میانگین حسابی عملکرد (MP) در هر دو شرایط تنش ملایم و شدید کمبود آب، هیبریدهای K166×K18، SC500، K3647×K18 و SC400 بیشترین تحمل را به تنش کمبود آب نشان دادند. شاخص ­های GMP و STI که دارای بیشترین همبستگی مثبت با عملکرد در شرایط تنش و

کلیدواژه‌ها

تجزیه به مؤلفه های اصلی؛ تجزیه کلاستر؛ ذرت؛ شاخص تحمل؛ عملکرد دانه

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