تأثیر مهارکننده‌های سنتز لیگنین بر ماندگاری گل بریدنی ژربرا

نوع مقاله: مقاله کامل

نویسندگان

1 دانشجوی سابق کارشناسی ارشد گیاهان زینتی، دانشکده کشاورزی، دانشگاه ایلام

2 استادیار، دانشکده کشاورزی، دانشگاه ایلام

3 استادیار، بخش تحقیقات علوم زراعی- باغی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان گیلان، سازمان تحقیقات، آموزش و ترویج کشاورزی، رشت، ایران

چکیده

مشکل عمده گل­های شاخه بریدنی ژربرا، ماندگاری کوتاه پس از برداشت است که منجر به خم­شدن سریع ساقه می­شود. هدف اصلی از این مطالعه، بررسی اثر ترکیبات مهار­کننده سنتز لیگنین به­عنوان محلول نگه­دارنده روی ماندگاری پس از برداشت گل ژربرا رقم دانمارکی بود. ساقه­های برش­یافته گل ژربرا با بازدارنده­های شیمیایی شامل EDTA (5، 10 و 15 میلی­مولار)، NaF  (06/0، 08/0 و 1/0 میلی­مولار) و NaN3(05/0، 1/0 و 2/0 میلی­مولار) به­مدت 20 ساعت و دمای 20 درجه سانتی­گراد (تیمار کوتاه مدت) تیمار شدند. نتایج نشان داد که غلظت 2/0 میلی‎مولار  سدیم­آزید و غلظت 06/0 میلی‎مولار فلوئورید­سدیم،  بیشترین ماندگاری را نسبت به سایر تیمارها (14روز) داشتند. غلظت‌های بالاتر فلوئورید­سدیم (1/0 میلی­مولار) با سوختگی حاشیه گلبرگ‌ها همراه بود. همچنین تیمار 2/0 میلی‎مولار سدیم­آزیداثرات مثبت و معنی‌داری روی میزان وزن تر نسبی (8/51 درصد)، جذب آب (81/49 درصد)، قطر نسبی گل (94/44 درصد) و میزان آنتوسیانین گلبرگ (8/61 درصد) نسبت به گل‌های شاهد داشت؛ بر خلاف آن، ماندگاری ژربرا به­وسیله EDTA در هیچ­کدام از غلظت­های آن، افزایش پیدا نکرد. اطلاعات به­دست آمده نشان داد که کاربرد غلظت‌های مختلف EDTA با ایجاد سمیت، باعث تسریع خمیدگی ساقه ژربرا شد. بنابراین مهارکننده­های سنتز لیگنین مانند سدیم­آزیدو فلوئورید­سدیم، احتمالا ماندگاری گل را با کنترل ترمیم زخم و جلوگیری از انسداد در انتهای ساقه افزایش می­دهند؛ به­طوری که سبب تسهیل جذب محلول و کاهش میزان از دست­دهی وزن تر نسبی در گل بریدنی ژربرا می­شوند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of inhibitors of lignin biosynthesis on vase life of gerbera cut flowers

نویسندگان [English]

  • Masoumeh Ghafouriyan 1
  • Zeynab Roein 2
  • Mohammad Ali Shiri 3
1 Former M.Sc. Student of Ornamental Plants, Department of Horticultural Sciences, Faculty of Agriculture, Ilam University, Iran
2 Assistant Professor, Department of Horticultural Sciences, Faculty of Agriculture, Ilam University, Iran
3 Assistant Professor, Horticulture Crops Research Department, Guilan Agricultural and Natural Resources Research and Education Center, AREEO, Rasht, Iran
چکیده [English]

A major problem associated with cut Gerbera flowers is short postharvest life that resulted in rapid stem bending. The main objective of the present study was to investigate the effect of lignin biosynthesis inhibitors as vase solutions on the vase life of Gerbera (Gerbera jamesonii cv. Danish). Gerbera cut flowers were treated with chemical inhibitors include EDTA (5, 10 and 15mM), NaF (0.06, 0.08 and 0.1mM) and NaN3 (0.05, 0.1 and 0.2mM). Cut stems were placed in these solutions for 20 h at 20°C (Pulse treatment). Results showed that sodium fluoride at 0.06 mM and sodium azide at 0.2mM were more effective in increasing vase life of cut flowers (14 days) than other treatments. Tip burning in ray florets was found at the highest concentration tested of sodium fluoride (0.1mM). Also, sodium azide at 0.2mM showed significant (P<0.01) positive effects on maintenance of fresh weight (51.8%), water uptake (49.81%), flower diameter (44.94%) and anthocyanin content (61.8%) compared to control. In contrast, longevity of cut gerbera was not increased with EDTA treatment. The data showed that EDTA caused high toxicity and hastened the time to bending of stem. Therefore, lignin biosynthesis inhibitors such as sodium azide and sodium fluoride probably extended vase life by controlling wound healing and delaying occlusions at the cut stem ends. Thereby, they facilitate the absorption of solution and reduce the rate of decline in relative fresh weight in the Gerbera cut flowers.

کلیدواژه‌ها [English]

  • Gerbera jamesonii
  • Sodium azide
  • Sodium fluoride
  • Xylem occlusion
  • Water balance
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