Organic Phosphorus Substantially Contributes to Crop Plant Nutrition in Soils with Low Phosphorus Availability
Organic Phosphorus Substantially Contributes to Crop Plant Nutrition in Soils with Low Phosphorus Availability
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DOI：
10.3390/agronomy11050903
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发表时间：
2021-05-01
期刊：
影响因子：
3.7
通讯作者：
Kunito, Takashi
中科院分区：
文献类型：
--
作者：
Moro, Hitoshi;Park, Ho-Dong;Kunito, Takashi
为评价大麦根际磷素的有效性和微生物在磷素动态中的作用，以两种不同施肥管理方式的土壤和栽培大麦为材料，构建了根际培养箱。CV. Minorimugi）5周。采用磷酸酶添加法结合化学提取法对土壤中有机磷（Po）的磷酸酶不稳定库进行了研究。相当数量的无机磷（Pi）的NaHCO 3馏分中采取了大麦根在土壤中具有高的Pi可用性，而宝，主要是植酸类磷的NaHCO 3馏分，水解，然后采取了大麦根在土壤中具有低的Pi可用性。在5周的培养过程中，两种土壤均未观察到对NaOH-Pi或NaOH-Po的显著利用。在低磷土壤中，酸性磷酸单酯酶和磷酸二酯酶活性升高，并在Biolog ECO板细菌更大的利用宝基板，观察根际相比，在散装土壤。这表明通过增加磷酸酶活性来增强Po水解以满足P需求，使得Po成为土壤中大麦的重要P源。
To evaluate phosphorus (P) availability and the role of microorganisms in P dynamics in the barley rhizosphere, we constructed a rhizobox using two arable Andosols under different fertilization management regimens and cultivated barley (Hordeum vulgare L. cv. Minorimugi) for 5 weeks. The phosphatase-labile pool of organic phosphorus (Po) was assessed using a phosphataseaddition approach in combination with chemical extraction of Po from soils. A considerable amount of inorganic P (Pi) in the NaHCO3 fraction was taken up by barley roots in a soil with high Pi availability, whereas Po, primarily phytate-like P in the NaHCO3 fraction, was hydrolyzed and then taken up by barley roots in a soil with low Pi availability. No significant utilization of either NaOH-Pi or NaOH-Po was observed for both soils during the 5-week cultivation. In the soil with low Pi availability, elevated acid phosphomonoesterase and phosphodiesterase activities, and greater utilization of Po substrates by bacteria in the Biolog ECO plate, were observed in the rhizosphere when compared with those in the bulk soil. This suggested enhanced Po hydrolysis by increased phosphatase activities to meet the P demand, making the Po an important P source for barley in the soil.