Effect of Magnetic Field on Growth and Development Parameters of Rudbeckia hirta L. Seed in Dry and Humid Conditions
محورهای موضوعی : مجله گیاهان زینتی
Golazin Golbaz
1
,
Behzad Kaviani
2
1 - Department of Horticultural Science, Rasht Branch, Islamic Azad University, Rasht, Iran
2 - Department of Horticultural Science, Rasht Branch, Islamic Azad University, Rasht, Iran
کلید واژه: Seed germination, Electromagnetic field, Ornamentals, Biophysical treatment,
چکیده مقاله :
The magnetic field (MF) is considered as a biophysical treatment to change the growth and development parameters. Current research was carried out to evaluate the effect of different intensities of MF (0, 45, 60, 70 and 75 mT) on seed germination and some morphologic and physiologic parameters of Rudbeckia hirta L. in dry and humid conditions for 30 min. Results showed that the MF treatment increased germination percentage of dry seeds more than humid seeds and control. The intensity of 70 mT induced the maximum content of germination of dry seeds (94.5%). The MF decreased the seeds germination rate in both dry and humid conditions, as the control seeds showed the highest germination rate (3.5 days). Investigation of all morphologic traits like plantlet length and vigor index and physiologic (humid and dry weights of plantlet) revealed that the MF caused more induction of growth in these traits than the control. Totally, the use of 70 mT MF on dry seeds for optimum growth and development in Rudbeckia hirta L. is recommended.
میدان مغناطیسی بهعنوان یک تیمار بیوفیزیکی برای تغییر شاخصهای رشد و نمو در گیاهان در نظر گرفته میشود. تحقیق حاضر به منظور بررسی تاثیر میدانهای مختلف مغناطیسی (0، 45، 60، 70 و 75 میلیتسلا) در شرایط خشک و مرطوب به مدت 30 دقیقه روی جوانهزنی بذر و برخی شاخصهای مورفولوژیکی و فیزیولوژیکی کوکب کوهی (Rudbeckia hirta L.) انجام شد. نتایج نشان داد که تیمار میدان مغناطیسی باعث افزایش درصد جوانهزنی بذرهای خشک نسبت به بذرهای مرطوب و شاهد شد. شدت میدان مغناطیسی 70 میلیتسلا باعث تحریک بیشترین میزان جوانهزنی بذرهای خشک (40/95 درصد) گردید. میدان مغناطیسی، سرعت جوانهزنی بذرها را در هر دو شرایط خشک و مرطوب کاهش داد، بهطوریکه بذرهای شاهد بیشترین سرعت جوانهزنی (5/3 روز) را نشان دادند. بررسی همهی صفات مورفولوژیکی از جمله طول گیاهچه و شاخص بنیه و فیزیولوژیکی (وزن تر و خشک گیاهچه) آشکار کرد که میدانهای مغناطیسی باعث تحریک بیشتر رشد در این صفات نسبت به شاهد شدند. در مجموع، استفاده از شدت میدان مغناطیسی 70 میلیتسلا روی بذرهای خشک برای رشد و نمو بهینه در کوکب کوهی توصیه میگردد.
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