نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه زراعت، دانشکده کشاورزی، دانشگاه صنعتی شاهرود، سمنان، ایران.

2 دانشیار، گروه زراعت، دانشکده کشاورزی، دانشگاه صنعتی شاهرود، سمنان، ایران.

3 استاد، مؤسسه تحقیقات اصلاح و تهیه نهال و بذر، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران.

چکیده

به‌منظور بررسی اثرات تنش خشکی آخر فصل و محلول‎پاشی سیلیکات‎پتاسیم بر عملکرد و اجزای عملکرد در ژنوتیپ‏های بهاره کلزا، آزمایشی به‌صورت فاکتوریل اسپلیت‌پلات در قالب طرح بلوک‏های کامل تصادفی با سه تکرار در سال‌های زراعی مدت 96-1395 و 97-1396 درمزرعه پژوهشی مؤسسه تحقیقات اصلاح و تهیه نهال و بذر کرج اجرا شد. عامل آبیاری در دو سطح آبیاری معمول (شاهد) و قطع آبیاری از مرحله خورجین‏دهی به بعد و عامل محلول‏پاشی در دو سطح (محلول‏پاشی با چهار گرم در لیتر سیلیکات‎پتاسیم و عدم محلول‏پاشی) به‌صورت فاکتوریل در کرت‏های اصلی و ژنوتیپ‎های بهاره کلزا شامل DALGAN، RGS003، RGS×OKAPI، RGS×SLM و OG×AL در کرت‏های فرعی قرار ‏گرفتند. نتایج این بررسی نشان داد صفات موردمطالعه تحت تأثیر تیمارهای کاربردی قرار گرفتند. بیش‌ترین عملکرد دانه (5620 کیلوگرم در هکتار) که 4/9 درصد نسبت به شاهد افزایش داشت. کلروفیل کل (71/1 میلی‌گرم در گرم وزن تر) در سطح آبیاری کامل به‌همراه محلول‌پاشی در ژنوتیپ OG×AL  به‌دست آمد. تنش خشکی آخر فصل موجب افزایش مقاومت روزنه‌ای، پرولین برگ، کربوهیدارت محلول برگ و کاهش مقدار کلروفیل کل و محتوای نسبی آب برگ شد. در شرایط تنش خشکی ژنوتیپ‏های DALGAN و RGS×SLM از عملکرد بالاتری برخوردار بودند، که حاکی از نمودِ بهتر آن‌ها در شرایط تنش است. سرانجام، مطالعه ما اثر مفید سیلیکات پتاسیم را در بهبود تحمل به تنش خشکی آخر فصل در گیاهان کلزا را نشان داد.

کلیدواژه‌ها

عنوان مقاله [English]

The effect of Potassium Silicate and Late-Season Drought Stress on the Physiological Characters of Canola

نویسندگان [English]

  • Mojdeh Sadat Khayat Moghadam 1
  • Ahmad Gholami 2
  • Amir Hossein Shirani rad 3
  • Mahdi BaradaranFiroozabadi 2
  • Hamid Abbasdokht 2

1 Ph.D. Candidate, Department of Agronomy, Faculty of Agriculture, Shahrood University of Technology, Semnan, Iran.

2 Associate Professor, Department of Agronomy, Faculty of Agriculture, Shahrood University of Technology, Semnan, Iran.

3 Professor of Seed and Plant Improvement Institute (SPII), Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran

چکیده [English]

In order to study the effects of late-season drought stress and foliar application of potassium silicate on yield and yield components of spring genotypes of canola, a factorial split-plot experiment is conducted in Karaj, Iran in a randomized complete block configuration with three replications for two years of cultivation (2016-2018). The irrigation is performed at two levels in this study, including routine irrigation (control) and interruption of irrigation from the pod formation stage. Potassium silicate foliar application at two levels is comprised of 0 and 4 g liter-1 in factorial status in main plots and five Brassica napus L. genotypes including OG×AL, RGS×SLM, DALGAN, RGS003 and RGS×Okapi in subplots.  The results show that the measured properties are affected by the applied treatments. Full irrigation with foliar application in OG×AL genotype results in highest seed yield (5620 Kg/ha) and total chlorophyll content (1.71 mg/g.FW) increase stomatal resistance, leaf proline, leaf soluble and carbohydrates, decreasing total chlorophyll content and relative leaf water content. Under drought stress conditions, DALGAN and RGS× SLM genotypes have higher yield, which indicates its better performance under stress conditions. Finally, our research demonstrates Potassium Silicate's beneficial effects in improving the drought tolerance of canola plants, particularly at the end of the season. Our study will act as a foundation for any attempt in new approaches to mitigate drought damage, establishing a functional connection between the position of potassium silicate, physiological response, and drought stress tolerance in canola plants.

کلیدواژه‌ها [English]

  • Interruption of irrigation
  • Proline
  • Relative leaf water content
  • Solution carbohydrate
  • Total chlorophyll
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