Application of Colored Nets to Prevent Sunburn and Increase Pomegranate Fruit Quality

Document Type : Research Paper


Department of Horticultural Science, School of Agriculture, Shiraz University, Shiraz, I. R. Iran


A prevalent problem in pomegranate fruit (Punica granatum L.) is sunburn which reduces fruit quality. This study aimed to reduce the severity of sunburn during the growth of pomegranate fruit by covering them with colored netted bags. Kaolin (5%) as a traditional treatment to reduce sunburn was used to compare the efficiency of noble and traditional techniques. The netted bags were either white, green, yellow, gray or blue. The experiment was carried out on a commercial cultivar (‘Rabab-e-Neyriz’) over a period of two successive years. The colors of the netted bags affected the anthocyanin content of arils at harvest time. They also reduced sunburn damage. Fruit of the control group were damaged notably by sunburn (32.26%), compared to those covered with blue and white netted bags (0%). The highest amount of ascorbic acid and the minimum amount of anthocyanin were recorded in fruit covered with blue netted bags. The lowest degree of aril whitening (i.e. the discoloration of arils) was observed when fruit were covered with white bags. Covering the fruits with gray netted bags caused the highest antioxidant activity and the highest total phenolic content in the arils. Overall, covering fruit with netted bags is recommended to prevent sun burn and to increase fruit quality.


Article Title [Persian]

کاربرد تورهای رنگی برای جلوگیری از آفتاب سوختگی و افزایش کیفیت میوه انار

Authors [Persian]

  • محسن رمضانی
  • مجید راحمی
  • اصغر رمضانیان
بخش علوم باغبانی، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ج. ا. ایران
Abstract [Persian]

یک مشکل شایع در میوه انار (Punica granatum L.) آفتاب سوختگی است که باعث کاهش کیفیت میوه می شود. هدف از این مطالعه، کاهش میزان آفتاب سوختگی در طی رشد میوه انار با پوشاندن آنها با تورهای رنگی بود. برای مقایسه کارایی تورهای رنگی از کائولین (5%) به عنوان یک روش سنتی برای کاهش آفتاب سوختگی استفاده شد. کیسه های توری به رنگ‌های سفید ، سبز ، زرد ، خاکستری یا آبی بودند. این مطالعه در مدت دو سال متوالی بر روی انار رقم تجاری رباب نی ریز انجام شد. رنگ تورها در زمان برداشت بر محتوای آنتوسیانین انار دانه‌ها تأثیر داشت. آنها همچنین آسیب های ناشی از آفتاب سوختگی را کاهش دادند. میوه های گروه شاهد در مقایسه با آنهایی که با تورهای آبی و سفید پوشانده شدند (0%) به طور قابل توجهی (32/26%) در اثر آفتاب سوختگی  آسیب دیدند. بیشترین میزان اسید اسکوربیک و کمترین مقدار آنتوسیانین در میوه های پوشیده شده با تورهای آبی ثبت شد. کمترین میزان سفید شدن انار دانه در اثر پوشاندن میوه‌ها با تورهای سفید مشاهده شد. پوشاندن میوه‌ها با تورهای خاکستری باعث بیشترین فعالیت آنتی اکسیدانی و بالاترین میزان ترکیبات فنلی کل در انار دانه‌ها شد. به طور کلی، پوشاندن میوه با تور برای جلوگیری از آفتاب سوختگی و افزایش کیفیت میوه توصیه می شود.

Keywords [Persian]

  • کیسه های توری
  • کائولین
  • انار
  • کیفیت
  • آفتاب سوختگی
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