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اثر تیمارهای مختلف پوشش بذر بر جوانه‌زنی کلزا در شرایط تنش خشکی و شوری: با استفاده از راهبرد مدلسازی‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه زراعت و اصلاح نباتات، پردیس ایوریحان، دانشگاه تهران، پاکدشت، ایران

2 استادیار، گروه زراعت واصلاح نباتات، پردیس ایوریحان، دانشگاه تهران، پاکدشت، ایران

3 استاد، گروه زراعت و اصلاح نباتات، پردیس ایوریحان، دانشگاه تهران، پاکدشت، ایران

4 استادیار، گروه گیاهپزشکی، پردیس ایوریحان، دانشگاه تهران، پاکدشت، ایران

چکیده

این تحقیق به‏منظور بررسی اثر تیمارهای مختلف پوشش بذر بر جوانه‌زنی کلزا در شرایط تنش خشکی و شوری انجام شد. به این منظور، دو آزمایش به‏صورت فاکتوریل در قالب طرح کامل تصادفی با چهار تکرار در آزمایشگاه صورت گرفت. در هر دو آزمایش یکی از فاکتورها شامل 10 تیمار مختلف پوشش بذر بود. فاکتور دوم در دو آزمایش متفاوت بودند. در آزمایش اول، سطوح تنش خشکی صفر، 8/0-، 1- و 2/1- مگاپاسگال و در آزمایش دوم سطوح تنش شوری صفر، هفت، 14 و 21 دسی‏زیمنس بر متر نمک NaCl مورد بررسی قرار گرفتند. نتایج نشان داد که حداقل ضریب هیدروتایم (θH) درT9 (627/22 مگاپاسکال ساعت)، T3 (538/22 مگاپاسکال ساعت) و T6 (263/22 مگاپاسکال ساعت) مشاهده شد. کمترین مقدار پتانسیل پایه (Ψb (50)) مربوط به تیمارهای T4 (332/1- مگاپاسکال) و T1 (324/1- مگاپاسکال) بودند. حداکثر درصد جوانه‌زنی در شرایط شوری مربوط به T2 (75/86 درصد) بود. بیشترین مقدار آستانه تحمل به شوری (X0) مربوط به T3 (38/16 دسی‏زیمنس بر متر) بود. بیشترین سرعت جوانه‌زنی در تمام سطوح شوری مربوط به T3 بود. به‏طورکلی، تیمارهای پوشش بذر T3، T6 و T9 درشرایط خشکی و T3 در شرایط شوری بهترین عملکرد را داشتند. همچنین، بررسی ارتباط بین پارامترهای مختلف مدل‏ شوری و هیدروتایم نشان داد که با کاهش ضریب هیدروتایم مقدار آستانه تحمل به شوری افزایش خواهد یافت و با منفی‏تر شدن پتانسیل پایه حداکثر درصد جوانه‏زنی در شرایط شوری افزایش خواهد یافت.

کلیدواژه‌ها

عنوان مقاله [English]

The effect of different seed coating treatments on the seed germination of canola under drought and salinity stresses: using modeling approach

نویسندگان [English]

  • Shirin Taghizoghi 1
  • Elias Soltani 2
  • Iraj Allahdadi 3
  • Reza Sadeghi 4

1 M.Sc. Student of Agronomy, Department of Agronomy and Plant Breeding Sciences, Aboureyhan Campus, University of Tehran, Pakdasht, Iran.

2 Assistant Professor, Department of Agronomy and Plant Breeding Sciences, Aboureihan Campus, University of Tehran, Pakdasht, Iran.

3 Professor, Department of Agronomy and Plant Breeding Sciences, Aboureihan Campus, University of Tehran, Pakdasht, Iran.

4 Assistant Professor, Department of Entomology and Plant Diseases, Aboureihan Campus, University of Tehran, Pakdasht, Iran.

چکیده [English]

This research was conducted to investigate the effects of different seed coating treatments on the seed germination of canola under drought and salinity stresses. In order to, two factorial experiments were conducted based on completely randomized design with four replications in laboratory. In both experiments, one of the factors were 10 different seed coating treatments. The second factor was different in two experiments: in the first experiment, the levels of drought stress of 0, -0.8, -1, and -1.2 MPa were considered, and in the second experiment, the levels of salinity stress of 0, 7, 14 and 21 ds/m NaCl were investigated. Results indicated that the lowest hydrotime constant (θH) were observed in T9 (22.627 MPa h), T3 (22.538 MPa h), and T6 (22.263 MPa h). The lowest base water potential (Ψb (50)) were belonged to T4 (-1.332 MPa) and T1 (-1.324 MPa). The maximum of germination percentage under salinity stress (Gmax) was observed in T2 (86.75%). The highest threshold to salinity tolerance (Xo) was belonged to T3 (16.38 ds/m). The highest germination rate was belonged to T3 in all levels of salinity. Totally, seed coating treatments of T3, T6 and T9 were the best treatments under drought stress and T3 was the best treatment under salinity stress.

کلیدواژه‌ها [English]

  • Hydrotime
  • Seed vigor
  • Threshold of drought tolerance
  • Threshold of salinity tolerance
  • Water potential
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