نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری تخصصی زراعت، دانشکده کشاورزی، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران.

2 استاد گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران

3 استاد دانشگاه کشاورزی و منابع طبیعی رامین.

4 استادیار گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران

5 استادیار، عضو هیأت علمی بخش اصلاح و تهیه نهال و بذر، مرکز تحقیقات کشاورزی و منابع طبیعی استان خوزستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، اهواز، ایران.

چکیده

این پژوهش با هدف تعیین نقش رژیمهای مختلف آبیاری بر کیفیت تبدیل دانه ژنوتیپ ­های برنج در استان خوزستان طراحی و اجرا گردید. آزمایش با رژیم آبیاری و ژنوتیپ به صورت کرت‌های یک­بار خرد شده، در قالب طرح بلوک‌های کامل تصادفی و سه تکرار به مدت دو سال (1393 و 1394) در مزرعه ایستگاه تحقیقات کشاورزی شاوور وابسته به مرکز تحقیقات کشاورزی و منابع طبیعی خوزستان اجرا شد. چهار رژیم آبیاری (1، 3، 5 و 7 روزه) درکرت‌های اصلی و 12 ژنوتیپ برنج در کرت‌های فرعی قرار گرفتند. نتایج تجزیه مرکب نشان داد اثر متقابل بین ژنوتیپ و تنش آبی در تمامی صفات به غیر از درصد سبوس و عرض دانه که نشان دهنده جمع پذیری آنها می­باشد معنی­دار بود. به عبارتی ژنوتیپ­ ها بسته به شرایط مختلف آبیاری واکنش متفاوتی داشتند. به طوریکه گذشته از طول و عرض دانه که با افزایش تنش کاهش یافتند، در تیمار آبیاری دوم به دلیل سازگاری ژنوتیپ­ ها و رطوبت مطلوب­تر، عملکرد دانه، راندمان تبدیل، درجه تبدیل و درصد برنج کامل بیشترین مقدار را داشتند اما از کمترین درصد پوسته و سبوس و برنج خرد برخوردار بودند. به ترتیب صفات مزبور دارای بیشترین همبستگی معنی­ دار مثبت و منفی با عملکرد دانه بودند. که می­تواند از اهداف مهم در تحقیقات به­نژادی و اصلاح ارقام باشد.

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