不同类型早熟桃、油桃采后贮藏效果研究

采用不同肉质类型的桃、油桃果实为材料，对采后低温和自发气调包装等对果实硬度、失重和SSC含量等的变化进行了研究，结果表明：(1)不同类型桃、油桃采后果实硬度变化差异较大，常温下24-30和中桃2号果实硬度下降较慢，而中油桃5号、10号较快，在冷库低温条件下，24-30、中油桃5号和中油桃10号两周后硬度出现迅速下降，而曙光和中桃2号在贮藏后即迅速下降，带皮硬度与去皮硬度之间有一定差异，但变化趋势基本一致；(2)MA包装能有效地延缓采后桃、油桃果实硬度的降低，在常温及低温条件下均是如此，不同肉质类型间差异明显，曙光和中桃2号非常敏感，而中油桃10号则不太敏感，即MA包装对其果实硬度降低的延缓没有其它品种明显；(3)采后桃、油桃果实的SSC含量均有一定的降低，低温下该过程较慢，MA包装在常温下有加剧SSC下降的趋势，低温下则不明显，这可能与常温下采后立即进行MA包装不利于“田间热”及呼吸热的及时散发而加剧呼吸有关。(4)桃、油桃采后果实失重明显，低温有助于大大减缓贮藏桃、油桃的失重，常温下1天的失重相当于低温条件下1周的失重，不同类型品种表现有一定差异，常温下曙光失重较慢，而冷库低温条件下中桃2号失重要快于曙光和中油桃10号。

Research on Keeping Quality of Different Flesh Types of Prunus persica L.(Bastch.)

Effects of post-harvest cold storage and Modified Atmosphere Package on fruit hardness(FH), weight losing(WL) and soluble solid content(SSC) of different peach or nectarine varieties were investigated. The results showed that: (1) There were obviously differences of fruit hardness among varieties of different flesh types. In room temperature, FH of ‘24-30’ and ‘Zhongtao No.2’ went down slower than ‘Zhongyoutao No.5’ and ‘Zhongyoutao No.10’. In cold storage, ‘24-30’, FH of Zongyoutao No.5’ and ‘Zhongyoutao No.10’ descent quickly after 2 weeks of storage while that of ‘Shuguang’ and ‘Zhongtao No.2’ quickly descent just after storage. (2) MA package could effectively slow down the decreasing of FH. There were obvious differences among different varieties while ‘Zhongyoutao No.10’ was less sensitive than others. (3) Soluble solid content went down after harvest and the procedure was slower in lower temperature. In room, MA package seems accelerate the descendent of SSC. This may result from that the package could prevent the diffuse of heat and promote the respiration. (4) The WL was obvious after harvest and the cold storage could greatly slow down it. There were some differences between different types of varieties.