SELECTIVITY AND KINETICS OF ION UPTAKE BY BARLEY PLANTS FOLLOWING NUTRIENT DEFICIENCY
SELECTIVITY AND KINETICS OF ION UPTAKE BY BARLEY PLANTS FOLLOWING NUTRIENT DEFICIENCY
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DOI：
10.1093/oxfordjournals.aob.a086383
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发表时间：
1982-01-01
期刊：
影响因子：
4.2
通讯作者：
LEE, RB
中科院分区：
文献类型：
--
作者：
LEE, RB
大麦植物生长没有外部供应的P，S，Cl或N随后吸收这些营养物质，磷酸盐，硫酸盐，Cl-和硝酸盐，更迅速地比营养充足的对照植物在类似的条件下。与P，S和Cl，增加吸收被限制在营养素已经缺乏，或关闭它的化学类似物;其他阴离子的吸收不受影响或减少。没有研究缺氮植物增强硝酸盐吸收的选择性。不同营养状况的植物对磷酸盐、硫酸盐和氯离子吸收速率的差异主要是由于每单位根重的这些阴离子的最大运输能力的变化，尽管在没有外部氯离子的情况下生长的植物中，有一些证据表明根对该离子的亲和力也有所增加。
Barley plants grown without an external supply of P, S, Cl or N subsequently absorbed these nutrients, as phosphate, dulfate, Cl- and nitrate, more rapidly than did nutrient-sufficient control plants under similar conditions. With P, S and Cl, increased absorption was restricted to the nutrient which had been deficient, or to close chemical analogs of it; the uptake of other anions was unaffected or decreased. The selectivity of enhanced nitrate uptake by N-deficient plants was not examined. The differences in the rates of phosphate, sulfate and Cl absorption by plants of differing nutrient status were due principally to changes in the maximum transport capacity for these anions per unit weight of root, although in plants grown without external Cl- there was some evidence that the roots also developed an increased affinity for that ion.