بررسی ویژگی‌های جوانه‌زنی و تعیین دماهای مهم بذر اسفرزه (Plantago ovate)

هاشمی, عباس; توکل افشاری, رضا; تبریزی, لیلا

doi:10.22059/ijfcs.2016.63583

بررسی ویژگی‌های جوانه‌زنی و تعیین دماهای مهم بذر اسفرزه (Plantago ovate)

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشجوی کارشناسی ارشد علوم و تکنولوژی بذر، پردیس کشاورزی و منابع طبیعی دانشگاه تهران

² استاد گروه زراعت و اصلاح نباتات، دانشکده کشاورزی دانشگاه فردوسی مشهد

³ استادیار گروه علوم باغبانی و فضای سبز، ، پردیس کشاورزی و منابع طبیعی دانشگاه تهران

10.22059/ijfcs.2016.63583

چکیده

در این تحقیق، تأثیر دماهای مختلف بر جوانه‌زنی بذر گیاه دارویی اسفرزه (Plantago ovata)، به‌منظور تعیین دماهای مهم یعنی کمینه، بهینه و بیشینه (کاردینال) بررسی شد. ارزیابی واکنش جوانه‌زنی در دماهای ثابت 5، 10، 15، 20، 25، 30 و 35 درجۀ سلسیوس در قالب طرح کامل تصادفی با چهار تکرار انجام شد. بذرهای جوانه‌زده هر روز شمارش شده و سپس سرعت جوانه‌زنی و درصد جوانه‌زنی محاسبه و نمودار دماهای مهم جوانه‌زنی بذر اسفرزه بر پایۀ دو مدل رگرسیونی دو تکه‌ای و چندجمله‌ای درجۀ دو ترسیم شد. بنا بر نتایج به‌دست‌آمده، تأثیر دما بر درصد و سرعت جوانه‌زنی بذر اسفرزه معنی‌دار (01/0p≤) بود. بالاترین سرعت جوانه‌زنی در دمای 20 درجۀ سلسیوس به میزان 067/0R50= مشاهده شد. بر پایۀ دو مدل دو تکه‌ای و چندجمله‌ای درجۀ دو، دماهای مهم جوانه‌زنی بذر اسفرزه شامل، دمای کمینه (پایه) (9/3 تا 5/4 درجۀ سلسیوس)، بهینه (8/18 تا 1/21 درجۀ سلسیوس) و بیشینه (7/33 تا 1/34 درجۀ سلسیوس) تعیین شد. با افزایش دما، شرایط مناسب‌تری از لحاظ دمایی، برای جوانه‌زنی اسفرزه ایجاد و باعث افزایش سرعت جوانه‌زنی می‌شود.

کلیدواژه‌ها

20.1001.1.20084811.1395.47.1.1.2

عنوان مقاله [English]

The evaluation of germination parameters and cardinal temperatures of Plantago ovata

نویسندگان [English]

Abbas Hashemi ¹
Reza Tavakol Afshari ²
Leila Tabrizi ³

¹ Formr M.Sc. Student of Seed Science and Technology, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran

² Professor, Faculty of Agriculture, Ferdowsi University of Mashhad, P.O. Box 91775-1163, Mashhad, Iran

³ Assistant Professor, Department of Horticultural Science and Landscape, College of Agriculture and Natural Resources, University of Tehran

چکیده [English]

This study was conducted to investigate the effects of different temperatures on seed germination of Plantago ovata and also to evaluate cardinal temperatures. Various constant temperatures (5, 10, 15, 20, 25, 30 and 35ºC) were conducted in a completely randomized design with four replications. The germinated seeds were counted every day and the rate of germination percentage, cumulative germination and cardinal temperatures of Plantago ovata seed germination based on two regression models including Intersected-lines Model and Quadratic Polynomial Model were calculated. The effects of temperatures on rate and percentage of germination was significant. The highest germination rates were in 20ºC (R50=0.067). Based on the two regression models, Intersected-lines Model and Quadratic Polynomial Model, the cardinal temperatures (Tbase, Topt and Tmax) of Plantago ovata seeds were: (3.9-4.5), (18.8-21.1) and (33.7-34.1)°C, respectively. With increasing temperature, the more suitable conditions in terms of temperature, is created for Plantago ovata seed germination and germination rate is increased.

کلیدواژه‌ها [English]

cardinal temperature
intersected-lines model
quadratic polynomial model
Plantago ovata

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