تأثیر دی‌کلروفنیل دی‌متیل اوره (DCMU) بر توان منبع و انتقال دوبارة کربوهیدرات‌های محلول ساقة گندم رقم پیشتاز در شرایط خشکی آخر فصل

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه زراعت و اصلاح نباتات، دانشکدة کشاورزی دانشگاه ولی‌عصر رفسنجان

2 کارشناسی ارشد، گروه زراعت و اصلاح نباتات، دانشکدة کشاورزی دانشگاه ولی‌عصر رفسنجان

3 دانشیار، گروه زراعت و اصلاح نباتات، دانشکدة کشاورزی دانشگاه ولی‌عصر رفسنجان

چکیده

به‌‌منظور بررسی نقش اجزای نورساخت (فتوسنتز)کنندة گندم رقم پیشتاز در پر شدن دانه و انتقال دوبارة ذخایر ساقه در شرایط خشکی آخر فصل، آزمایشی گلدانی به‌صورت فاکتوریل دو عاملی در چارچوب طرح کاملاً تصادفی با سه تکرار در فضای باز مزرعة دانشکدة کشاورزی دانشگاه ولی‌عصر رفسنجان در فاصلة دی ماه 1390 تا خرداد ماه 1391 انجام شد. عامل اول عبارت از کاهش توان منبع در سه سطح شامل گیاه کامل (شاهد)، حذف نورساخت برگ پرچم و حذف نورساخت برگ‌های زیرین و عامل دوم تنش خشکی در دو سطح شامل آبیاری کامل (شاهد) و قطع آبیاری پس از گلدهی بود. حذف نورساخت با استفاده از مادة بازدارندة نورساخت DCMU انجام شد. نتایج نشان داد که حذف نورساخت برگ پرچم بر خلاف تیمار حذف نورساخت برگ‌های زیر برگ پرچم، سبب کاهش محتوای نشاسته و افزایش محتوای پروتئین آن شد اما اثر معنی‌داری بر وزن دانه نداشت. در زمان رسیدگی، محتوای کربوهیدرات‌های محلول ساقه در تیمار آبیاری شاهد تحت تأثیر تیمارهای کاهش توان منبع قرار نگرفت اما با قطع آبیاری پس از گلدهی به‌طور معنی‌داری افزایش یافت و بیشترین میزان آن در تیمار حذف نورساخت برگ‌های زیر برگ پرچم بود. از سوی دیگر، هیچ یک از تیمارهای قطع آبیاری پس از گلدهی و حذف نورساخت برگ‌ها تأثیری بر محتوای نیتروژن ساقه در زمان رسیدگی نداشتند. به نظر می‌رسد کاهش توان منبع در اثر حذف نورساخت برگ‌های زیرین سبب کاهش نیاز مخزن به مادة پرورده و نیتروژن و کاهش کارایی انتقال دوبارة آنها به سمت دانه می‌شود.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of dichlorophenyl dimethylurea (DCMU) on source strength and remobilization of stem water-soluble carbohydrates in wheat under terminal drought

نویسندگان [English]

  • Shahab Madah Hosseini 1
  • Maryam Khodadadpoor 2
  • Asghar Rahimi 3
1 Assistant Professor, Department of Agronomy and Plant Breeding, Vali-e-Asr University of Rafsanjan, Iran
2 M. Sc. Graduate in Agronomy, Department of Agronomy and Plant Breeding, Vali-e-Asr University of Rafsanjan, Iran
3 Associate Professor, Department of Agronomy and Plant Breeding, Vali-e-Asr University of Rafsanjan, Iran
چکیده [English]

In order to study the role of photosynthetic tissues on grain filling and remobilization of stem reserves under terminal drought, a pot experiment as semi-field was conducted as two-factor factorial in complete randomized design with three replicates at research farm of Agriculture college of Vali – e – Asr University of Rafsanjan during January to June 2012 . First factor was source strength reduction in three levels as control, inhibition of flag leaf photosynthesis and inhibition of photosynthesis of leaves below flag leaf. The second factor was watering regime including normal watering and water withholding after flowering. Photosynthesis inhibition was applied by DCMU. Results showed that only inhibition of flag leaf photosynthesis decreased starch content but increased grain protein content. However mean grain weight was not significantly affected by this treatment. At maturity and in normal watering regime, stem water soluble carbohydrates (WSC) content was not significantly affected by source strength reduction treatments, while water withholding significantly increased it. The highest WSC content was observed in inhibition of photosynthesis of leaves below flag leaf.  On the other hand, neither source strength reduction treatments nor watering regimes, had significant effect on stem nitrogen content. Results suggest that source strength reduction induced by inhibition of photosynthesis may lead to decreased sink demand for photoassimilate and nitrogen and consequently decreased remobilization efficiency.

کلیدواژه‌ها [English]

  • Drought stress
  • photosynthesis
  • Protein
  • starch
  • yield

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سابقه مقاله

  • تاریخ دریافت: 09 اسفند 1392
  • تاریخ بازنگری: 27 خرداد 1394
  • تاریخ پذیرش: 20 تیر 1394
  • تاریخ انتشار: 01 مهر 1394

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