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Diffusivity of 1-methylcyclopropene in spinach and bok choi leaf tissue, disks of tomato and avocado fruit tissue, and whole tomato fruit

文献类型： 外文期刊

作者： Dong, Xiaoqing 1 ; Ramirez-Sanchez, Maricruz 1 ; Huber, Donald J. 1 ; Rao, Jingping 2 ; Zhang, Zhengke 1 ; Choi, Su 1 ;

作者机构： 1.Univ Florida, Dept Hort Sci, IFAS, Gainesville, FL 32611 USA

2.Northwest A&F Univ, Coll Hort, Yangling 712100, Shaanxi Provinc, Peoples R China

3.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Danzhou 571737, Peoples R China

4.Rural Dev Adm, Natl Hort Res Inst, Suwon 440706, South Korea

关键词： Avocado;Diffusion;Metabolism;1-Methylcyclopropene;Ripening;Tomato

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： 2013 年 78 卷

页码：

收录情况： SCI

摘要： Gaseous 1-methylcyclopropene (1-MCP) has been widely employed for delaying ripening and senescence of harvested fruit and vegetables; however, details on ingress of gaseous1-MCP in plant tissues, which might contribute to differences in responsiveness of different horticultural commodities to 1-MCP, have not been reported. In this study, we used spinach and bok choi leaves, disks from tomato epidermis, stem-scar and avocado-exocarp tissues, and whole tomato fruit to examine ingress of gaseous 1-MCP. Using a dual-flask system, equilibration of 20 mu L L-1 (831 mu mol m(-3)) 1-MCP through leaf tissue was reached within 1-2 h, and paralleled 1-MCP transfer through glass-fiber filter paper. For disks derived from fruit tissues, changes in 1-MCP concentrations in the dual-flask system showed anomalous patterns, declining as much as 70% in source flasks with negligible accumulation in sink flasks. The pattern of 1-MCP distribution was markedly different from that of ethylene, which approached equal distribution with tomato stem-scar and avocado exocarp but not tomato epidermis tissues. 1-MCP ingress was further addressed by exposing whole tomato fruit to 20 mu L L-1 1-MCP followed by sampling of internal fruit atmosphere. Tomato fruit accumulated internal gaseous 1-MCP rapidly, reaching approximately 8-9 mu L L-1 within 3-6 h at 20 degrees C. Internal 1-MCP concentration ([1-MCP]) declined around 74 and 94% at 1 and 3 h after exposure, respectively. Ingress was similar at all ripening stages and reduced by 45% in fruit coated with commercial wax. Blocking I-MCP ingress through stem- and blossom-scar tissues reduced accumulation by around 60%, indicating that ingress also occurs through epidermal tissue. Fruit preloaded with 1-MCP and immersed in water for 2h retained about 45% of post-exposure gaseous [1-MCP], indicating that 1-MCP is not rapidly sorbed or metabolized by whole tomato fruit. Rapid ingress of gaseous 1-MCP was also observed in tomato fruit exposed to aqueous 1-MCP. Both accumulation and post-exposure decline in internal gaseous [1-MCP] are likely to vary among different fruit and vegetables in accordance with inherent sorption-capacity, surface properties (e.g., waxes, stoma), volume and continuity of gas-filled intercellular spaces, and tissue hydration. (c) 2012 Elsevier B.V. All rights reserved.

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