Phosphorus deficiency enhances root exudation of low-molecular weight organic acids and utilization of sparingly soluble inorganic phosphates by radish (Raghanus satiuvs L.) and rape (Brassica napus L.) plants
Phosphorus deficiency enhances root exudation of low-molecular weight organic acids and utilization of sparingly soluble inorganic phosphates by radish (Raghanus satiuvs L.) and rape (Brassica napus L.) plants
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DOI：
10.1023/a:1004214410785
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发表时间：
1997-02
期刊：
影响因子：
4.9
通讯作者：
F. Zhang;J. Ma;Y. Cao
中科院分区：
文献类型：
--
作者：
F. Zhang;J. Ma;Y. Cao
以萝卜和油菜为材料，分别在磷充足和缺磷营养液中培养，收集根系分泌物。在萝卜中，酒石酸，苹果酸和琥珀酸是占主导地位的有机酸增加15倍（琥珀酸）和60倍（苹果酸）之间的磷缺乏条件下。在石英砂培养中，萝卜对AlPO4的利用率明显高于Ca3（PO4）2，而油菜对AlPO4的利用率则相反。这一结果表明了一种特殊的有机酸对难溶性磷的活化作用，并与两种植物在中国酸性（萝卜）和石灰性（油菜）土壤上的优先生长相一致。
Root exudates were collected from radish and rape plants grown in P sufficient and P deficient nutrient solution. In radish, tartaric, malic and succinic acids were the dominant organic acids which increased between 15 times (succinic acid) and 60 times (malic acid) under P deficient conditions. In another experiment in quartz sand culture supplied with either Ca3(PO4)2 or AlPO4, radish utilized P from AlPO4 much better than from Ca3(PO4)2 whereas the opposite was true for rape. The results demonstrated the role of a particular organic acid in mobilizing sparingly soluble P and were in accordance with the preferential growth of two plants on acid (radish) and calcareous (rape) soils in China.