بررسی تاثیر زمان و دمای پرایمینگ بر جوانه زنی سرخارگل(Echinacea angustifolia)تحت تنش شوری

نوع مقاله: مقاله پژوهشی

نویسندگان

دانشکده کشاورزی، دانشگاه شاهد،تهران

چکیده

به­منظور بررسی تاثیر پیش­تیمار نیترات پتاسیم بر جوانه­زنی بذر سرخارگل در زمان­ها و شرایط دمایی متفاوت تحت تنش شوری، آزمایشی به­صورت فاکتوریل در قالب طرح کامل تصادفی با سه تکرار در آزمایشگاه تکنولوژی بذر دانشکده کشاورزی شاهد انجام شد. بذرها با نیترات پتاسیم پنج درصد در چهار سطح زمانی (شاهد، 10، 20 و 30 ساعت) و پس از آن در چهار سطح دمایی (شاهد، 4، 10 و 20 درجه سلسیوس) تیمار شدند و سپس در دو سطح شوری (0 و 5- بار) کلریدسدیم جهت جوانه­زنی قرار گرفتند. نتایج نشان داد که اثر پیش تیمارها بر صفات مورد ارزیابی در سطح احتمال یک درصد معنی­دار بود. در مقایسه بین تیمارها، تاثیر پیش­تیمار 20 ساعت نیترات پتاسیم بذرها دمای 20 درجه سلسیوس و در شرایط تنش شوری، موجب افزایش معنی­دار درصد و یکنواختی جوانه­زنی، طول و وزن خشک گیاهچه و کاهش میانگین زمان جوانه­زنی شد. به­طورکلی اعمال پیش­تیمار 20 ساعت نیترات پتاسیم بذرها در دمای 20 درجه سلسیوس موجب شد تا جوانه­زنی تحت شرایط تنش شوری بهبود یابد

کلیدواژه‌ها


عنوان مقاله [English]

Effect of time and priming temperature on germination of coneflower (Echinacea angustifolia) under salinity stress

نویسندگان [English]

  • Arezoo Paravar
  • Saeideh Maleki Farahani
چکیده [English]

In order to evaluate the effect of priming on seed germination of coneflower at different times and temperature under salinity stress an experiment conducted factorialy as completely randomized design with 3 replications. The seeds were primed with potassium nitrate 5% at for four times (control, 10, 20 and 30 h) and four temperature (control, 4, 10 and 20 ° C), then the primed and unprimed seeds were subjected to two levels of salinity (0, 5 bar) as induced by sodium chloride .Results showed that effect of the treatments on evaluated traits was significant. Seed priming for 20 hours at 20 ° C increased percentage and uniformity of germination, seedling length and dry weight and reduce the mean germination time. It was found that pre-treatment for 20 hours at 20 ° C improves germination characteristics under salinity stress.

کلیدواژه‌ها [English]

  • Coneflower
  • Germination
  • Priming Time
  • Priming Temperature
  • Salinity
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