pH is the dominant factor controlling the levels of phytate-like and DNA-like phosphorus in 0.5 M NaHCO3-extracts of soils: Evaluation with phosphatase-addition approach

Kunito, Takashi; Haraguchi, Shingo; Hanada, Kiyoko; Fujita, Kazuki; Moro, Hitoshi; Nagaoka, Kazunari; Otsuka, Shigeto

doi:10.1016/j.geoderma.2021.115113

Cited by 1 publication

(1 citation statement)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Organic phosphorus (Po) comprises a considerable portion of phosphorus (P) in arable Andosols [1,2]. Because Po contributes to crop plant nutrition after its mineralization to inorganic P (Pi) [3], evaluating the lability of soil Po to phosphatase hydrolysis is indispensable for assessing P availability for crop plants in arable soils, in particular Andosols [4]. Because of the remarkably high activity of phosphatase in the rhizosphere, which is produced by both plant roots and microorganisms [5,6], Po seems to be actively mineralized in the rhizosphere.…”

Section: Introductionmentioning

confidence: 99%

Organic Phosphorus Substantially Contributes to Crop Plant Nutrition in Soils with Low Phosphorus Availability

2021

Self Cite

View full text Add to dashboard Cite

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 phosphatase-addition 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.

show abstract