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为了探究桃树对钙离子的吸收、转运与分布规律,首次应用放射性核素~(41)Ca示踪结合超灵敏的加速器质谱技术(AMS)研究山东肥城桃树果肉、叶片、多年生枝条等器官从果实膨大期到成熟期钙的输运规律以及成熟期果树各器官~(41)Ca的分布状况。结果表明:通过树干注射硝酸钙(含~(41)Ca)的方法可以有效为桃树补充钙剂,超过60%的钙剂储存在树干,从树干中部到上部~(41)Ca分布逐渐减少;叶片、枝条、果肉等器官对钙离子吸收主要在幼果细胞分裂期,从果实膨大期到成熟期叶片、果肉中钙含量一直不断减少,而多年生枝条中钙含量从果实膨大期到成熟期前期不断减少而后期上升;成熟期桃树各器官~(41)Ca分布结果表明蒸腾拉力大的器官中钙离子含量较高,其中新生器官中的钙离子含量新梢>果皮>果肉。由此可见,使用~(41)Ca-AMS技术能够探究桃树对钙离子的吸收与分布规律,从而对桃树的科学补钙具有指导意义。
In order to explore the absorption, transport and distribution of calcium ion in peach tree, the first application of radionuclide ~ (41) Ca tracing combined with hypersensitive accelerator mass spectrometry (AMS) was to study the peach tree flesh, leaves, perennial branches and other organs The law of calcium transport from fruit enlargement to maturity and the distribution of ~ (41) Ca in various organs of mature fruit trees. The results showed that the injection of calcium nitrate (~ (41) Ca) into the trunk could effectively add calcium to the peach tree, more than 60% of the calcium was stored in the trunk, and the distribution of ~ (41) Ca gradually decreased from the middle of the trunk to the upper part ; Leaf, shoots, flesh and other organs of calcium absorption mainly in the young fruit cell division, from the fruit expansion period to the mature leaves, the calcium content in the pulp has been declining, and perennial branches of the calcium content from fruit enlargement to maturity The early stage decreased and then increased. The results of ~ (41) Ca distribution in various organs of mature peach tree showed that the organs with large transpiration tension had higher calcium content, and the calcium content in newborn organs was> shoot> peel> pulp. Thus, ~ (41) Ca-AMS technology can be used to explore the absorption and distribution of calcium ion in peach trees, which is of guiding significance to calcium supplementation in peach trees.