ارزیابی عملکرد دانه و روغن ژنوتیپ‌های بهاره کلزا (Brassica napus L.) تحت سطوح مختلف کمبود آب

نوع مقاله : مقاله پژوهشی

نویسنده

بخش تحقیقات علوم زراعی- باغی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی آذربایجان‌شرقی، سازمان تحقیقات آموزش و ترویج کشاورزی، تبریز، ایران

چکیده

        این تحقیق با هدف ارزیابی اثرات خشکی بر صفات فیزیولوژیک مرتبط با تحمل به خشکی، عملکرد دانه و روغن، اجزای عملکرد و شناسایی ژنوتیپ‌های بهاره متحمل به خشکی کلزا در مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی آذربایجان شرقی در سال 1394 انجام شد. آزمایش به‌صورت اسپلیت پلات بر پایه بلوک‌های کامل تصادفی با سه تکرار طراحی گردید. فاکتور اصلی تنش خشکی در سه سطح  بدون تنش، تنش از مرحله گل‌دهی و خورجین‌دهی تا رسیدگی دانه و فاکتور فرعی ژنوتیپ در پنج سطح شامل RGS003، ظفر، ساری گل، زرفام و دلگان بود.نتایج نشان دادند بروز خشکی از مراحل گل‌دهی و خورجین‌دهی باعث افزایش معنی‌دار دمای برگ و کاهش  مقدار آب نسبی برگ، هدایت روزنه، تعداد خورجین در بوته، وزن هزار دانه، عملکرد دانه و روغن  گردید. ولی اثرات منفی خشکی در مرحله گل‌دهی شدیدتر بود، بنابراین درصورت محدودیت منابع آب، آبیاری در مرحله گل‌دهی اولویت بیشتری خواهد داشت. همبستگی منفی و معنی‌دار دمای برگ و مثبت ومعنی‌دار مقدار آب نسبی برگ و هدایت روزنه با تعداد خورجین در بوته، وزن هزار دانه، عملکرد دانه و روغن نشان داد این صفات می‌توانند اثرات خشکی روی کلزای بهاره را منعکس کنند. وجود همبستگی مثبت ومعنی‌دار تعداد خورجین در بوته و وزن هزار دانه با عملکرد دانه و روغن روشن ساخت اثر خشکی روی عملکرد‌ها از طریق کاهش این اجزای عملکرد بوده است. ژنوتیپ‌های مورد مطالعه از محصول‌دهی مشابهی در شرایط بدون تنش برخوردار بودند ولی تحت تنش خشکی، بیشترین عملکرد دانه و روغن به RGS003 تعلق داشت.
 
 

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of Grain ed and Oil Yields in Spring Genotypes of Oilseed Rape (Brassica napus L.) under Different Water Deficit Levels

نویسنده [English]

  • Bahman Pasban Eslam
چکیده [English]

Evaluation of drought effects on some physiological traits relevant to drought tolerance, seed and oil yields, yield components and recognizing tolerant oilseed rape genotypes were the goals of research. The experiment was conducted as split plot based on a randomized complete block design with three replications in East Azarbaijan Research and Education Center for Agriculture and Natural Resources during 2015.The experimental factors were drought stress with three levels: non-stressed and drought stress from flowering and pod formation stages and genotype in 5 levels: RGS003, Zafar, Sarigol, Zarfam and Dalgan. Occurring drought from flowering and pod formation stages led to significant increase in leaf temperature and significant decrease in leaf relative water content, stomatal conductance, pods per plant, 1000 seeds weight, seed and oil yields. But the effects of drought from flowering stage were too hard. In case of water resources limitation, irrigation during flowering stage will be more important than pod formation stage. The existence of significantly negative correlation among leaf temperatures and significantly positive correlations among  leaf  relative water content, stomatal conductance with the pods per plant, 1000 seeds weight, seed and oil yields showed that, these traits can indicate drought effects on spring oilseed rape. Also the existence of significantly positive correlations among the pods per plant and 1000 seeds weight with seed and oil yields, showed that, drought reduced yields via decreasing these components. All of studied genotypes indicated similar performance under non-stressed condition. But under drought conditions, RGS003 indicated higher seed and oil yields.      
 

کلیدواژه‌ها [English]

  • Leaf Temperature
  • Oil Yield
  • Relative Water Content
  • Stomatal Conductance
  • Water Deficit
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