کاهش آسیب سرمازدگی و بهبود ویژگی‌های پاداکسندگی میوۀ انار با تیمارهای پیش و پس از برداشت با کاربرد متیل‌جاسمونات

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استاد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران

2 دانشجوی سابق دکتری، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران

3 دانشیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران

چکیده

انار از جمله میوه‌های حساس به سرمازدگی است و نگهداری آن در دمای پایین‌تر از 5 درجۀ سلسیوس منجر به ظهور نشانه‌های سرمازدگی می‌شود. این پژوهش به‌صورت یک آزمایش ترکیبی از تیمار پیش و پس از برداشت غلظت‌های مختلف متیل‌جاسمونات (0 (شاهد)، 1/0، 2/0 و 3/0 میلی‌مولار) بر کاهش سرمازدگی و ترکیب‌های پاداکسندگی (آنتی‌اکسیدانی) و ارزش تغذیه‌ای میوۀ انار رقم ملس ساوه انجام شد. میوه‌ها در دمای 1±4 درجۀ سلسیوس و رطوبت نسبی 95-90 درصد به مدت 4 ماه نگهداری شدند. تیمار 2/0 میلی‌مولار متیل‌جاسمونات به‌طور معنی‌داری سبب کاهش شاخص سرمازدگی، میزان نشت یونی و مالون‌دی‌آلدئید به ترتیب به میزان 54، 20 و 27 درصد شد. میوه‌های تیمارشده با سطح 2/0 میلی‌مولار متیل‌جاسمونات دارای ترکیب‌های فنلی، آنتوسیانین‌های کل، ظرفیت پاداکسندگی و فعالیت آنزیم فنیل‌آلانین ‌آمونیالیاز بیشتری در مقایسه با شاهد داشتند. همچنین میوه‌های انار تیمارشده با متیل‌جاسمونات درصد کاهش وزن، مواد جامد محلول کل و pH کمتر، ویتامین ث و اسید کل بیشتری در مقایسه با میوه‌های شاهد داشتند. به‌طورکلی متیل‌جاسمونات را می‌توان به‌عنوان یک روش سودمند و کاربردی برای افزایش مقاومت میوه‌های انار به آسیب سرمازدگی و بازدارندۀ کاهش ارزش تغذیه‌ای میوه‌ها در مدت انبارمانی و انتقال آن‌ها به بازار، به‌کار برد.

کلیدواژه‌ها


عنوان مقاله [English]

Amelioration of chilling injury and improvement of antioxidants in pomegranate by pre and postharvest methyljasmonate application

نویسندگان [English]

  • Mesbah Babalar 1
  • Farhad Pirzad 2
  • Mohammad Ali Askari Sarcheshmeh 3
  • Alireza Talaei 1
  • Hossein Lessani 1
1 Professor, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
2 Former Ph.D. Student, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
3 Associate Professor, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
چکیده [English]

Pomegranate fruit is one of the sensetive fruit to chilling injury (CI), when they are exposed to temperatures below 5 °C. This study applied a combination of pre and postharvest methyl jasmonate (MeJA) at 0 (control), 0.1, 0.2 and 0.3 mM on chilling injury (CI), antioxidant capacity and fruit quality in pomegranate fruit. Fruits were stored at 4±1 °C and 90-95% relative humidity for 4 months. MeJA treatment at 0.2 mM significantly delayed the postharvest CI and increased electrolyte leakage and malondialdehyde (MDA) accumulation about 54, 20 and 27 percent, repectively. In these fruits, total phenolics, DPPH scavenging activity, Phenylalanine ammonia-lyase and total anthocyanine were found at higher levels in treated than control pomegranates during postharvest storage. Also, treated fruits had lower weight loss, total soluble solids (TSS), pH and higher TA and Vit C. Overall, these findings demonstrated that pre and postharvest treatments with MeJA had potential effect on enhancing tolerance of pomegranates to postharvest chilling injury, maintaining the quality and extending storability and marketing of pomegranate fruits.

کلیدواژه‌ها [English]

  • Anthocyanins
  • electrolyte leakage
  • phenylalanine ammonia-lyase
  • storage
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