Evaluation of the Mechanical Strength of Gerbera Flower Stem in Response to Silicon and Salicylic Acid Application
محورهای موضوعی : مجله گیاهان زینتیMesbah Babalar 1 , Behzad Edrisi 2 , Roohangiz Naderi 3
1 - Department of Horticultural Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
2 - 1Department of Horticultural Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
2National Institute of Ornamental Plants (NIOP), Mahallat, Iran
3 - Department of Horticultural Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
کلید واژه: Vase life, Shear strength, Flexural Strength, Fracture strength, lignin,
چکیده مقاله :
Stem and peduncle bending by the weight of the flower is one of the main postharvest problems in gerbera (Gerbera jamesonii Bolus.) and sometimes caused stem crushing or water loss. In this research, silicon and salicylic acid were applied to enhance the mechanical strength of inflorescence stem, and the results revealed that stem curving was decreased by silicon and salicylic acid treatments. Shear strength and lignin content were increased by SA treatments at both upper and lower parts of the stem. It seems that lignin content was associated with shear strength at upper part of stem. Additionally, silicon content of flower stem was significantly increased under silicon application and mechanical strength of the lower part of stem has correlation with silicon content in stem tissue. These results suggested that silicon and salicylic acid application could enhance the mechanical strength of inflorescence stem and improve the cut flower quality in gerbera.
خم شدن ساقه و دمگل تحت تاثیر وزن گل یکی از مشکلات اصلی پس از برداشت در ژربرا (Gerbera jamesonii Bolus.) است و گاهی اوقات باعث شکستگی ساقه و یا اختلال در جذب آب میشود. در این تحقیق، تیمار سیلیسیوم و اسید سالیسیلیک به منظور افزایش مقاومت مکانیکی ساقه گل استفاده شد. نتایج نشان داد که خمیدگی ساقه با مصرف سیلیسیوم و تیمار اسید سالیسیلیک کاهش یافت. مقاومت برشی و مقدار لیگنین توسط تیمار سالیسیلیک اسید در هر دو بخش بالا و پایین ساقه افزایش یافت. به نظر میرسد که مقدار لیگنین ساقه با مقاومت برشی در قسمت بالایی ارتباط داشت. علاوه بر این، مقدار سیلیسیوم در بافت ساقه گل به طور قابلتوجهی با مصرف سیلیسیوم افزایش یافت و مقاومت مکانیکی قسمت پایین ساقه با میزان سیلیسیوم بافت همبستگی داشت. این نتایج نشان داد که مصرف سیلیسیوم و تیمار اسید سالیسیلیک میتواند باعث افزایش مقاومت مکانیکی ساقه گل و بهبود کیفیت گل بریده ژربرا گردد.
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