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首页> 外文期刊>Plant and Soil >Effect of iron plaque outside roots on nutrient uptake by rice (Oryza sativa L.): phosphorus uptake
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Effect of iron plaque outside roots on nutrient uptake by rice (Oryza sativa L.): phosphorus uptake

机译：根外铁斑对水稻（Oryza sativa L.）养分吸收的影响：磷的吸收

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摘要

Under anaerobic conditions, ferric hydroxide deposits on the surface of rice roots have been shown to affect the uptake of some nutrients. In the present experiment, different amount of this iron plaque were induced on the roots of rice (Oryza sativa cv. TZ88-145) by supplying different Fe(OH)3 concentrations in nutrient solutions, and the effect of the iron plaque on phosphorus uptake was investigated. The results showed that iron plaque adsorbed phosphorus from the growth medium, and that the amount of phosphorus adsorbed by the plaque was correlated with the amount of plaque; that the phosphorus concentration in the shoot increased by up to 72% after 72 h Fe(OH)3 concentrations in the nutrient solution from 0 to 30 mg Fe/litre, corresponding with amounts of iron plaque from 0.2 to 24.5 mg/g (root dry weight); that the phosphorus concentration in the shoots of rice with iron plaque was higher than that without iron plaque though the concentration in the shoot decreased when Fe(OH)3 was added at50 mg Fe/litre producing 28.3 mg/g (root dry weight) of plaque; and that the phosphorus concentrations in Fe-deficient and Fe-sufficient rice plants with iron plaque were the same, although phytosiderophores were released from the Fe-deficient roots. The phytosiderophores evidently did not mobilize phosphorus adsorbed on plaque. The results indicated that iron plaque on rice plant roots could be considered a phosphorus reservoir.
机译：在厌氧条件下，已证明水稻根表面氢氧化铁的沉积会影响某些养分的吸收。在本实验中，通过在营养液中提供不同浓度的Fe（OH）3，在稻根（Oryza sativa cv。TZ88-145）的根部诱导不同量的铁斑，以及铁斑对磷吸收的影响被调查了。结果表明，铁斑块从生长培养基中吸附了磷，并且斑块吸附的磷量与斑块量相关。营养液中的Fe（OH）3浓度从0到30 mg Fe / L增长72 h后，枝条中的磷浓度增加了72％，铁斑的含量从0.2到24.5 mg / g（根净重）;尽管以50 mg Fe / L添加Fe（OH）3时茎中的磷浓度降低，产生28.3 mg / g（根干重）的铁，但有铁斑的水稻的芽中的磷浓度高于没有铁斑的水稻。牌匾;尽管缺铁根中释放了植物铁载体，但缺铁和缺铁的带铁斑的水稻植株中的磷浓度相同。植物铁载体显然不能动员斑块上吸附的磷。结果表明，水稻植株根上的铁斑块可被认为是磷的储库。

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