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
(Department of Horticultural Science, Rasht Branch, Islamic Azad University, Rasht, Iran)
Behzad Kaviani
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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