تأثیر تیمار پیش از برداشت پوترسین‏ بر ویژگی‏های کمی، کیفی و عمر پس از برداشت گل شاخه‌بریدۀ لیزیانتوس ((Eustoma grandiflorum cv. Miarichi Grand white

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج

2 استاد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج

3 استادیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج

چکیده

این آزمایش باهدف بررسی تأثیر محلول‏پاشی برگی پوترسین در مرحلۀ پیش از برداشت بر کیفیت رویشی و ویژگی‏های پس از برداشت گل شاخه‌بریدۀ لیزیانتوس رقم میاریچی گرند وایت انجام شد. گیاهان در گلدان‏های محتوای خاک زراعی، ماسه و خاک‌برگ پوسیده با نسبت 1:1:1 حجمی کشت شدند. تیمار‏ها در مرحلۀ پیش از برداشت شامل پوترسین با چهار غلظت 0 (شاهد)، 5/0، 1 و 2 میلی‌مولار بودند که در مرحلۀ انگیزش غنچه انجام شد. صفات مربوط به کیفیت رویشی شامل طول و قطر غنچه، ارتفاع ساقۀ گل‏دهنده و وزن تر و خشک آن، سطح برگ و محتوای سبزینه (کلروفیل) بودند. نتایج نشان داد، تیمار پوترسین منجر به افزایش بسیاری از ویژگی‏ها مانند طول و قطر غنچه، ارتفاع ساقۀ گل‏دهنده و وزن تر و خشک آن، سطح برگ و محتوای سبزینۀ برگ نسبت به تیمار شاهد شد. همچنین در بین غلظت‏ها پوترسین 2 میلی‌مولار بیشترین تأثیر را بر عامل‏های اندازه‏گیری‌شده داشتند. به‌منظور بررسی تأثیر تیمارهای پیش از برداشت پوترسین بر ویژگی‏های پس از برداشت گل شاخه‌بریدۀ لیزیانتوس، گل‏ها در مرحله‏ای که دو غنچۀ آن به‌طور کامل باز شدند، برداشت شدند. نتایج نشان داد، تیمارهای پیش از برداشت منجر به افزایش عمر گلجایی، حفظ بهتر وزن تر نسبی و جذب آب نسبی نسبت به تیمار شاهد شدند. همچنین کاهش میزان نشت یونی، تجمع کمتر مالون‏دی‏آلدئید، فعالیت کمتر آنزیم لیپوکسیژناز، تجمع کمتر H2O2 و بهبود آنزیم‏های پاداکسندۀ (آنتی‌اکسیدان) کاتالاز و آسکوربات پراکسیداز در غلظت 2 میلی‌مولار پوترسین نسبت به تیمار شاهد به دست آمد.

کلیدواژه‌ها


عنوان مقاله [English]

Impact of preharvest putrescine treatment on quantitative, qualitative traits and postharvest vase life of Lisianthus (Eustoma grandiflorum cv. Miarichi Grand white) cut flowers

نویسندگان [English]

  • Davoud Ataii 1
  • Roohangiz Naderi 2
  • Azizollah Khandan-Mirkohi 3
1 Former M.Sc. Student, Professor, Assistant Professor, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
2 Professor, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
3 Assistant Professor, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
چکیده [English]

This experiment was conducted to evaluate the effect of foliar application of putrescine on the pre-harvest stage on vegetative quality and postharvest attribtes of Lisianthus ‘Miarichi Grand white’ cut flowers. Plants were planted in the pots containing soil, sand and peat with a volume ratio of 1: 1: 1. The pre-harvest putrescine treatments by 0 (distilled water), 0.5, 1, and 2 mM were applied as foliar spray at the stage of bud initiation. Vegetative quality attributes such as number of flower bud, flower bud length and diameter, flower stem length, flower stem fresh and dry weight, leaf area and chlorophyll content were measured. Results showed that application of putrescine increased number of flower bud, flower bud length and diameter, flower stem length, flower stem fresh and dry weight, leaf area and chlorophyll content compared to the control. Also, putrescine at 2 mM was the most effective treatments in this study. To investigate the effects of preharvest putrescine on postharvest characteristics of Lisianthus cut flowers, the flowers were harvested when two flowers were fully opened. The results showed that pre-harvest treatment led to increase vase life, relative fresh weight and relative water uptake compared to the control. Also, the decrease in ionic leakage, less accumulation of malondialdehyde, reduced enzyme activity lipoxygenase, less accumulation of H2O2 and increase of antioxidant enzymes catalase and ascorbate peroxidase in the concentration of 2 mM putrescine were observed.

کلیدواژه‌ها [English]

  • Antioxidant Enzymes
  • lipoxygenase
  • Malondialdehyde
  • vase life
  • vegetative quality
  • water uptake
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