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首页> 外文期刊>Acta Horticulturae >The interaction of ethylene and carbohydrate status on the postharvest quality of non-rooted vegetative cuttings.
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The interaction of ethylene and carbohydrate status on the postharvest quality of non-rooted vegetative cuttings.

机译：乙烯和碳水化合物状态的相互作用对无根植物cutting插收获后品质的影响。

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Successful post-harvest shipment and propagation of non-rooted vegetative cuttings is dependent on the interaction of carbohydrate status and ethylene sensitivity. Carbohydrate status of the cutting is affected by the ambient irradiance delivered to the stock plants, the time of cutting harvest from the stock plant and the amount of respiration that occurs in the post-harvest environment. The combination of stock plants grown under relatively high irradiance (10-20 mol m-2 d-1), afternoon harvest, and proper post-harvest temperature management result in cuttings with a relative high carbohydrate status. Ethylene production results from the wounding process that occurs during cutting harvest. For most species, ethylene production in the post-harvest environment increases as temperature increases, e.g., poinsettia cuttings stored in sealed packages at 20 degrees C for two days accumulated 0.25 ppm of ethylene while cuttings stored at 10 degrees C accumulated only 0.06 ppm. Plant sensitivity to this ethylene is dependent on the carbohydrate status of the cutting. Cuttings that possess a relatively high carbohydrate status are less sensitive to leaf senescence when exposed to ethylene. In contrast, cuttings with a low carbohydrate status are more sensitive to ethylene in the post-harvest environment. The most common symptoms include chlorosis and/or abscission of the most mature leaves. If the mature leaves exhibit only marginal chlorosis without rapid abscission, then the ethylene signal may result in improved rooting during propagation. Adventitious root formation was inhibited by application of the ethylene action inhibitor 1-MCP during the post-harvest environment, whereas it was promoted by exogenous ethylene when applied to cuttings with a higher carbohydrate status. These results suggest that a post-harvest ethylene signal promotes root regeneration when carbohydrate status is higher in the source leaves. Alternatively, when the carbohydrate status is low, rapid leaf abscission occurs and root formation is not promoted.
机译：收获后的成功运输和无根营养插条的繁殖取决于碳水化合物状态和乙烯敏感性的相互作用。 cutting插的碳水化合物状态受传递到砧木的环境辐照度，砧木从砧木收获的时间以及收获后环境中发生的呼吸量的影响。在较高辐照度（10-20 mol m-2 d-1）下生长的砧木，下午收获以及适当的收获后温度管理相结合，导致cutting插具有较高的碳水化合物状态。乙烯的产生是由于收获时的伤口过程造成的。对于大多数物种而言，收获后环境中的乙烯产量随着温度的升高而增加，例如，一品红插条在20摄氏度的密闭包装中存储两天可积累0.25 ppm的乙烯，而10摄氏度的插条仅可积累0.06 ppm。植物对该乙烯的敏感性取决于the插的碳水化合物状态。碳水化合物含量较高的插条在暴露于乙烯时对叶片衰老的敏感性较低。相反，低碳水化合物状态的插条在收获后的环境中对乙烯更敏感。最常见的症状包括最成熟的叶片萎黄和/或脱落。如果成熟的叶片仅表现出少量的边缘萎黄而没有快速脱落，则乙烯信号可能导致繁殖期间生根的改善。在收获后的环境中，不定根的形成受到乙烯作用抑制剂1-MCP的抑制，而外源乙烯则在碳水化合物含量较高的插条上促进不定根的形成。这些结果表明，当源叶片中的碳水化合物状态较高时，乙烯收获后的信号会促进根系再生。可替代地，当碳水化合物状态低时，发生快速的叶脱落并且不促进根的形成。

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