بررسی تغییر شاخص‌های رشدی گیاه برنج (Oryza sativa L.) در مراحل مختلف رشد تحت تأثیر رژیم‌های مختلف آبیاری در منطقه خوزستان، ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دکترای زراعت. باشگاه پژوهشگران جوان و نخبگان، واحد دزفول، دانشگاه آزاد اسلامی، دزفول، ایران.

2 مربی کشاورزی دانشگاه پیام نور، ایران

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

4 استاد، دانشگاه علوم کشاورزی و منابع طبیعی رامین، گروه زراعت و اصلاح نباتات، تخصص: زراعت

5 استادیار، اهواز بلوار گلستان مرکزتحقیقات کشاورزی و منابع طبیعی خوزستان، فیزیولوژی گیاهان زراعی/ برنج

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

چکیده

این پژوهش با هدف تعیین نقش رژیم­های مختلف آبیاری بر عملکرد دانه و شاخص­های فیزیولوژیکی ژنوتیپ­های برنج هوازی در استان خوزستان به­مدت دو سال (1393 و 1394) طراحی و اجرا گردید. چهار رژیم آبیاری (1، 3، 5 و 7 روزه) درکرت‌های اصلی و 12 ژنوتیپ برنج در کرت‌های فرعی در سه تکرار قرار گرفتند. نتایج تجزیه مرکب نشان داد که بین ژنوتیپ، رژیم آبیاری و اثر متقابل دو عامل در تمامی مراحل رشد صفات تفاوت معنی­داری در سطح یک درصد وجود داشت. نسبت وزن ساقه ( (SWRبا افزایش رشد نیز افزایش یافت، ولی از مرحله 100 روز پس از کاشت به بعد، به­دلیل نقش مؤثر ساقه به­خصوص در شرایط کاهش میزان آبیاری در انتقال مجدد، شاهد کاهش این صفت بودیم، ولی در صفات سرعت فتوسنتز خالص ((NARو وزن مخصوص برگ (SLW) به­دلیل سهم بیشتر برگ در اوایل رشد، روندی کاملاً عکس حالت قبلی را داشتیم. نسبت وزن برگ (LWR) نیز بنا به­دلیل اخیر، روندی کاملاً کاهشی از ابتدا تا پایان دوره رشد را دارا بود. با کاهش رژیم آبیاری، به­دلیل سایه­اندازی کمتر کانوپی، سرعت فتوسنتز خالص روند نزولی را طی کرد. بیشترین مقدار وزن برگ در رژیم­های آبیاری با تناوب پنج و هفت روزه مشاهده شد، ولی وزن ساقه در این رژیم­های آبیاری کاهش یافت. مکانیسم فرار از شرایط تنش­زا سبب کاهش دوره رشد با کاهش رژیم آبیاری شد. در نهایت پیشنهاد می­شود این آزمایش در رژیم­های آبیاری و ژنوتیپ­های دیگر نیز انجام شود.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation on changes of growth indices of rice (Oryza sativa L.) in different growth stages under irrigation regimes in Khuzestan, Iran

نویسندگان [English]

  • kaveh Limouchi 1
  • fatemeh fateminick 2
  • Mehrdad Yarnia 3
  • Ataallah Siadat 4
  • Abdolali Gilani 5
  • Varahram Rashidi 6
1 Ph.D Agronomy. Young Researchers and Elite Club, Dezful Branch, Islamic Azad University, Dezful, Iran.
2 faculty of agronomy department of Payame noor university,Iran
3 Professor, Department of Agronomy, Faculty of Agriculture, Tabriz Branch, Islamic Azad University, Tabriz, Iran.
4 Professor., University of Agricultural and Natural Resources of Ramin, Ahwaz, Iran.
5 Assistant Professor of Seed and Plant Improvement Research Department, Khozestan Agricultural and Natural Resources Research Center, AREEO, Ahwaz, Iran.
6 Assistant Professor, Department of Agronomy, Faculty of Agriculture, Tabriz Branch, Islamic Azad University, Tabriz, Iran.
چکیده [English]

This study aimed to investigate the effect of irrigation regimes on grain yield and physiological indices of aerobic rice genotypes inKhuzestan province for two years (2014 and 2015). Four irrigation regimes (1, 3, 5 and 7 days) in main plots and 12 rice genotypes in sub-plots with three replications were considered. The combined analysis results showed that there were significant differences between genotypes, irrigation regimes and their interaction at all growth stages at 1%. SWR also increased with growth, but 100 days after planting due to the effective role of stem particularly in terms of reducing the amount of water, a decline was seen in this trait. By decreasing the irrigation regime due to less canopy shading, the NAR slowed down. The highest LWR were observed under 5- and 7-day in irrigation regimes, but SLW decreased in these irrigation regimes. The mechanism of escape from stressful conditions reduced the growth period by decreasing the irrigation regime. Finally, it is recommended that this experiment be carried out in irrigation regimes and other genotypes.

کلیدواژه‌ها [English]

  • Irrigation regimes
  • LWR
  • NAR
  • SLW
  • SWR
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