اثرات محلول‌پاشی دو فرم بالک و نانوذره سلنیوم بر ویژگی‌های ریخت‌شناسی آویشن دنایی (Thymus daenensis Celak)
محورهای موضوعی : فیزیولوژی گیاهی
زهرا آبروش
1
,
علیرضا ایرانبخش
2
,
حسین میرزایی ندوشن
3
,
مصطفی عبادی
4
,
زهرا اوراقی اردبیلی
5
1 - دانشجوی دکتری، گروه زیست‌شناسی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران
2 - استاد، گروه زیست شناسی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران
3 - استاد، بخش زیستفنآوری، موسسه تحقیقات جنگل‌ها و مراتع کشور، تهران، ایران
4 - استادیار، گروه زیست‌شناسی، واحد دامغان، دانشگاه آزاد اسلامی، دامغان، ایران
5 - دانشیار، گروه زیست شناسی گیاهی. دانشگاه آزاد اسلامی واحد گرمسار، ایران
کلید واژه: آویشن دنایی, نانوذرات, سلنیوم, ریخت‌شناسی, RWC.,
چکیده مقاله :
سلنیوم عنصری غیرفلزی و کمیاب با خواص آنتی‌اکسیدانی قوی که در مقیاس کم باعث رشد و مقاومت گیاهان به تنش‌های محیطی می‌شود. به‌منظور بررسی اثر تیمارهای سلنیومی بر رشد گیاه آویشن دنایی، تیمارهای سلنات سدیم (بالک) و نانو سلنیوم (2,4,8ppm) و شاهد بر روی گیاهان گلدانی در شرایط گلخانه و به‌صورت محلول‌پاشی بر روی اندام هوایی گیاه در شش مرحله به فاصله زمانی 14 روز یک‌بار اعمال شد. آزمایش در قالب یک طرح آماری تکراردار اجرا شد. نتایج آزمایش نشان داد که بر اساس صفات طول ساقه، تعداد ساقه، فعال‌شدن جوانه‌ها و شاخه‌های جانبی و طول برگ، طول ریشه، طول دمبرگ، فاصله میانگره، وزن تر و خشک اندام هوایی و ریشه، وزن آماس، وزن خشک و محتوای نسبی آب برگ، تیمارها در سطح یک درصد تفاوت معنی‌دار داشتند. درحالیکه بر اساس صفات پهنای برگ و برگ زرد، تیمارها در سطح پنج درصد معنی‌دار بودند. نتایج بسیاری از همبستگیهای ترکیبهای دوگانه صفات نیز معنی‌دار بودند. ولی غیرمعنیدار بودن برخی از ترکیبهای دوگانه صفات نیز قابل توجه بود. تیمارهای نانوذره سلنیوم در مقایسه با تیمارهای بالک متناظر، اثر بیشتری روی صفات داشتند. همچنین غلظت‌های بالاتر اثر بازدارندگی و غلظت‌های کمتر اثر محرک رشد را نشان دادند. به استثنای برگ زرد و محتوی نسبی آب برگ که در غلظت‌های بالاتر اثرپذیری بیشتری داشتند. به‌طور کلی نتایج نشان داد که تیمار سلنیوم در مقادیر کم سبب ترغیب رشد و در غلظت‌های بالا سبب مهار رشد شد.
Selenium is a non-metall and rare element with strong antioxidant properties that on a small scale, causes plant growth and resistance to abiotic stresses. In order to investigate the effects of selenium treatments on Thymus daenensis plant growth, sodium selenite (bulk) and nano selenium (each with 2,4,8ppm) along with a control were sprayed on potted plants in greenhouse conditions for six times with 14 days interval. The experiment was performed based on a replicated statistical design. The experimental results showed that based on stem length, number of stems, buds and lateral branches activation, leaf length, root length, petiole length, internode distance, shoots and roots fresh and dry weight, turgid weight and relative water content, effects of the treatments were significantly different at 1% level. Whereas, the treatments were significantly different on leaf width and yellow leaves at 5% level. Correlation coefficients of a great number of the trait combinations were also significant. Whereas, non-significance of several combinations of the traits were also noticeable. Selenium nanoparticle had a greater effect on the traits compared to the corresponding bulk treatments. Except for the yellow leaf and leaf relative water content, on which, higher concentrations of the treatments had higher effects. In general, the results showed that selenium treatment in small amounts caused growth stimulation but in high concentrations caused growth inhibition.
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