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Pre-harvest calcium application increases biomass and delays senescence of broccoli microgreens

文献类型： 外文期刊

作者： Kou, Liping 1 ; Yang, Tianbao 1 ; Luo, Yaguang 1 ; Liu, Xianjin 1 ; Huang, Luhong 1 ; Codling, Eton 4 ;

作者机构： 1.ARS, Food Qual Lab, Beltsville Agr Res Ctr, USDA, Beltsville, MD 20705 USA

2.Jiangsu Acad Agr Sci, Inst Food Safety, Nanjing 210014, Jiangsu, Peoples R China

3.Hunan Acad Agr Sci, Hunan Agr Prod Proc Inst, Changsha 410125, Hunan, Peoples R China

4.ARS, Environm Management & Byprod Utilizat Lab, Beltsville Agr Res Ctr, USDA, Beltsville, MD 20705 USA

关键词： Fresh-cut;Modified atmosphere packaging;Postharvest quality;Shelf life;Antioxidant enzyme;Senescence associated gene

期刊名称：POSTHARVEST BIOLOGY AND TECHNOLOGY （ 影响因子：5.537； 五年影响因子：5.821 ）

ISSN： 0925-5214

年卷期： 2014 年 87 卷

页码：

收录情况： SCI

摘要： Microgreen consumption has been steadily increasing in recent years due to consumer awareness of their unique color, rich flavor, and concentrated bioactive compounds. However, industrial production and marketing is limited by their short shelf-life associated with rapid deterioration in product quality. This study investigated the effect of pre-harvest calcium application on the post-harvest quality and shelf-life of broccoli microgreens. Broccoli microgreen seedlings were sprayed daily with calcium chloride at concentrations of 1, 10 and 20 mM, or water (control) for 10 days. The fresh-cut microgreens were packaged in sealed polyethylene film bags. Package headspace atmospheric conditions, overall visual quality and tissue membrane integrity were evaluated on days 0, 7, 14, and 21, during 5 degrees C storage. Results indicated that the 10 mM calcium chloride treatment increased the biomass by more than 50%, and tripled the calcium content as compared to the water-treated controls. Microgreens treated with 10 mM calcium chloride spray exhibited higher superoxide dismutase and peroxidase activities, lower tissue electrolyte leakage, improved overall visual quality, and reduced microbial growth during storage. Furthermore, calcium treatment significantly affected expression of the senescence-associated genes BoSAG12, BoGPX6, BoCAT3 and BoSAG12. These results provide important information for commercial growers to enhance productivity and improve postharvest quality and shelf-life, potentially enabling a broadening of the retail marketing of broccoli microgreens. Published by Elsevier B.V.

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