بررسی روابط بین شاخص‌های رشد و عملکرد در لاین‌های امیدبخش گندم نان در شرایط فاریاب و دیم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری رشته فیزیولوژی ، گروه زراعت ، دانشکده کشاورزی ، دانشگاه کردستان/ مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی کرمانشاه

2 عضو هیئت علمی دانشکده کشاورزی دانشگاه کردستان، (نگارنده مسئول)

3 استادیارگروه زراعت و اصلاح نباتات، دانشکده کشاورزی، دانشگاه کردستان

چکیده

به منظور مطالعه روابط شاخص‌های رشد لاین‌های امیدبخش گندم نان با عملکرد آنها دو آزمایش جداگانه در شرایط فاریاب و دیم در قالب طرح بلوک‌های کامل تصادفی در ایستگاه تحقیقات کشاورزی اسلام آباد غرب در سال زراعی 98-1397 اجرا شد. در هر آزمایش تعداد 9 لاین انتخابی به همراه 2 رقم به عنوان شاهد ارزیابی شدند. شرایط دیم در مقایسه با شرایط فاریاب باعث کاهش عملکرد دانه، عملکرد بیولوژیک، عملکرد کاه، شاخص برداشت و وزن هزاردانه به ترتیب به میزان 5/24، 2/21، 9/18، 2/4 و 4/13 درصد در میانگین لاین‌ها شد. تنش خشکی سبب کاهش مقدار شاخص‌های RGR، NAR،LAR، LWR و SLA به ترتیب به میزان 29، 17، 6، 3 و 6 درصد در مرحله گلدهی گردید. همچنین رابطه مثبت و معنی‌داری بین RGR با NAR در تمام مراحل هر دو آزمایش و با عملکرد بیولوژیک، عملکرد کاه و وزن هزار دانه در برخی مراحل مشاهده شد. در آزمایش فاریاب RGR در مرحله گلدهی همبستگی مثبت و معنی‌داری (*640/0r= +) با LWR داشت. از بین اجزا RGR، موًلفه NAR دارای همبستگی منفی و معنی‌داری (*700/0-r= ) در مرحله اول آزمایش فاریاب با LAR داشت. بین اجزاء LAR (یعنی LWR و SLA) با LAR در تمامی مراحل رابطه مثبت و معنی‌دار مشاهده شد و در مراحل اول و سوم نیز، همبستگی شاخص‌های SLA(*608/0r= + و *673/0r= +) و LAR (*663/0r= + و *704/0r= +) با عملکرد دانه در شرایط فاریاب مثبت و معنی‌داربود که در نهایت این دو پارامتر به عنوان شاخص-های مهم رشد و مرتبط با عملکرد دانه شناسایی شدند.

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