Effects of water stress at different deficit intensities on transport and distribution of C-14-assimilates in micropropagated apple plants

文献类型： 外文期刊

第一作者： Li, TH

作者： Li, TH;Li, SH;Wang, J;Yu, KS

作者机构：

关键词： C-14-assimilate;micropropagated apple plants;distribution;transport;water stress

期刊名称：EUROPEAN JOURNAL OF HORTICULTURAL SCIENCE （ 影响因子：1.482； 五年影响因子：1.503 ）

ISSN： 1611-4426

年卷期： 2003 年 68 卷 5 期

页码：

收录情况： SCI

摘要： Micropropagated 'Fuji' apple plants in Hoagland nutrient solution were subjected to water stress at different deficit intensities by regulating the osmotic potential of the solution with PEG-6000. Transport and distribution of C-14-assimilates among organs of previously water-stressed plants were compared with those under a normal water status by feeding leaves with (CO2)-C-14. Most C-14-assimilate was exported from the labelled leaves within 48 hours, and there were two peaks of export rate of C-14-assimilate in plants under a normal water status. No matter what deficit intensity was applied to the plants, water stress significantly decreased the export rate of C-14-assimilates from fed leaves, but did not modify the export patterns of C-14-assimilates. About 90% of the C-14-assimilates exported from the labelled leaves within 48 hours were distributed in the above-ground parts of the plants under a normal water status while from one third to two thirds of the C-14-assimilates were transported from labelled leaves into the roots of the micropropagated plants under water stress depending on the deficit intensity. Moreover, water stress decreased the distribution coefficient (K) of C-14-assimilates in the shoot apex, and increased the Ks of the roots and the phloem of the plants. A lower K of the shoot apex of water stressed trees than that of well-watered ones may result in a decreased growth of shoots. The higher K of the roots of the plants under water stress may signify a stronger sink and also a greater reservoir of carbon assimilates in the roots than those of the plants under normal water situation. It is suggested that the K of the phloem within a short time after feeding the leaves with (CO2)-C-14 may only signify the quantity of C-14-assimilates transport to the roots or a temporary reservoir of carbon assimilates in the phloem.

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