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枣离体果实水分吸收与质外体运输的研究 被引量:13

Studies on Water Uptake and Apoplastic Transport in Detached Chinese Jujube Fruits
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摘要 为了揭示枣果吸收水分后引起的裂果机制,以‘壶瓶枣’膨大期与着色期果实为试材,分别采用染液和清水浸泡枣果实、带叶果的木质化枣吊基部、果柄及去果柄后梗洼引入染液等处理,研究果实水分吸收与质外体运输的途径及能力。结果表明:离体枣果实可以通过果柄、果面吸收水分,水分经果柄木质部进入果实,后继续通过维管束或扩散作用运输到果实各个部位。膨大期青果维管束运输能力强,着色期果实梗洼下空腔变大,果柄维管束与果实内维管束的连接发生部分中断,维管束运输能力下降;而此时果实表皮细胞增大,排列疏松,通过果面吸水能力增大。 The objective of our study was to investigate the mechanism of fruit cracking caused by water uptake in Zizyphusjujuba Mill. The easily crack variety of jujube 'Huping' was used as material.Apoplastic dye solution was used as the tracer to monitor the water uptake and transport in detached fruits and branches with leaves and fruits. The results showed that water uptake by detached jujube fruitsoccurred through pedicel end and fruit surface. Water entered into fruits through pedicel xylem vascular, and accumulated in cavity under stalk. The vascular under epidermis and around fruit stone were stuffedby dye solution, and the speed of dye solution transport in the vascular bundles were high during fruit swell period, however, the distribution of stuffed dye in vascular bundles decreased and the speed of dyesolution transport decreased during coloring period. This is because of breakoff of vascular bundles and non-functional xylem. While the ability of water uptake through fruit surface was enhanced duringcoloring period, responding to enlarged and loosen epidermal cells. It suggested that the efficiency of water transport in vascular of jujube fruits was decreased from fruit coloring stage, this led to water uptakethrough the fruit surface become potential importance to fruit crack during raining.
出处 《园艺学报》 CAS CSCD 北大核心 2013年第3期433-440,共8页 Acta Horticulturae Sinica
基金 国家自然科学基金项目(31101511) 林业公益性行业科研专项(201004041-05)
关键词 果实 水分 维管束 质外体运输 jujube fruit water vascular bundle apoplastictransport
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参考文献20

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