Effect of Salicylic Acid, Citric Acid and Ascorbic Acid on Post-harvest Quality and Vase Life of Gerbera (Gerbera jamesonii) Cut Flowers
محورهای موضوعی : مجله گیاهان زینتی
Mona Mehdikhah
1
,
Rasoul Onsinejad
2
,
Mohammad Nabi Ilkaee
3
,
Behzad Kaviani
4
1 - Former M.Sc. Student, Department of Horticulture, Rasht Branch, Islamic Azad University, Rasht, Iran
2 - Department of Horticulture, Rasht Branch, Islamic Azad University, Rasht, Iran
3 - Department of Agronomy and Plant Breeding, Karaj Branch, Islamic Azad University, Karaj, Iran
4 - Department of Horticulture, Rasht Branch, Islamic Azad University, Rasht, Iran
کلید واژه: plant growth regulators, Organic acids, ornamental plants, Longevity, Asteraceae, Vase solution,
چکیده مقاله :
Cut gerbera (Gerbera jamesonii) flowers are sensitive to microbial contamination and have short vase life. The effect of salicylic acid, citric acid and ascorbic acid (50, 100 and 200 mg l-1) was evaluated on vase life of gerbera flowers. Changes in vase life, water absorption, and bacterial population in stem and vase solution, also biochemical characteristics such as protein concentration, lipid peroxidation level and enzymes activity such as superoxide dismutase and peroxidase were measured and compared with the control. Results showed that the maximum vase life (11.31 and 11.21 days) was achieved in 100 mg l-1 of both citric acid and salicylic acid, respectively. The vase life of control cut flowers was 5.80 days. Most solution uptake (0.907 ml g-1 F.W) was obtained in 100 mg l-1 of citric acid, too. The least bacterial colonies in stem end (151.00) and vase solution (66.33) was obtained in 100 mg l-1 citric acid. Differences between the content of bacterial colonies in vase solution containing 200 mg l-1 citric acid and 100 and 200 mg l-1 salicylic acid was not significant with 100 mg l-1 citric acid. The lowest content (46.04 and 46.21 nmol g-1 F.W.) of lipid peroxidation or MDA content was obtained from cut flowers treated with 200 mg l-1 of citric acid and 100 mg l-1 salicylic acid, respectively. Maximum activity of the peroxidase (0.063 mmol g-1 F.W.) and superoxide dismutase (40.80 nmol g-1 F.W.) enzymes was observed in 200 mg l-1 of citric acid.
گل بریده ژربرا به آلودگی میکروبی حساس است و عمر گلجایی کوتاهی دارد. اثر اسید سالیسیلیک، اسید سیتریک و اسید آسکوربیک (50، 100 و 200 میلیگرم بر لیتر) روی عمر گلجای گلهای ژربرا ارزیابی شد. تغییرات در عمر گلجای، جذب آب و جمعیت باکتریایی در ساقه و محلول گلجای، همچنین ویژگیهای بیوشیمیایی مانند غلظت پروتیین، سطح پراکسیدهشدن لیپید و فعالیت آنزیمهایی نظیر سوپراکسید دیسموتاز و پراکسیداز اندازهگیری شدند و با شاهد مورد مقایسه قرار گرفتند. نتایج نشان داد که بیشینه عمر گلجای (31/11 و 21/11 روز) بهترتیب در 100 میلیگرم بر لیتر هم اسید سیتریک و هم اسید سالیسیلیک بهدست آمد. عمر گلجایی گلهای شاخهبریده شاهد 80/5 روز بود. بیشترین جذب محلول (907/0 میلیلیتر بر گرم وزن تر) همچنین در 100 میلیگرم بر لیتر اسید سیتریک بهدست آمد. کمترین کلنی باکتریایی در انتهای ساقه (151) و محلول گلجای (33/66) در 100 میلیگرم بر لیتر اسید سیتریک بهدست آمد. تفاوتها بین میزان کلنیهای باکتریایی در محلول گلجای حاوی 200 میلیگرم بر لیتر اسید سیتریک و 100 و 200 میلیگرم بر لیتر اسید سالیسیلیک با 100 میلیگرم بر لیتر اسید سیتریک معنیدار نبود. کمترین مقدار (04/46 و 21/46 نانومول بر گرم وزن تر) پراکسیدهشدن لیپید (MDA) بهترتیب از گلهای بریده تیمارشده با 200 میلیگرم بر لیتر اسید سیتریک و 100 میلیگرم بر لیتر اسید سالیسیلیک بهدست آمد. بیشینه فعالیت پراکسیداز (063/0 میلیمول بر گرم وزن تر) و سوپراکسید دیسموتاز (80/40 نانومول بر گرم وزن تر) در 200 میلیگرم بر لیتر اسید سیتریک مشاهده شد.
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