اثر میدان مغناطیسی بر شاخصهای رشد و نمو بذر کوکب کوهی ( Rudbeckia hirta L.) در شرایط خشک و مرطوب
Subject Areas : Journal of Ornamental Plants
گل آذین گلباز
1
(
گروه باغبانی، واحد رشت، دانشگاه آزاد اسلامی، رشت، ایران
)
بهزاد کاویانی
2
(
گروه باغبانی، واحد رشت، دانشگاه آزاد اسلامی، رشت، ایران
)
Keywords: جوانهزنی بذر, گیاهان زینتی, میدان الکترومغناطیسی, تیمار بیوفیزیکی,
Abstract :
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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