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- W4206543105 abstract "Abstract Aims The family Proteaceae is one of the dominant families in nutrient-impoverished habitats in the Southern hemisphere, and less common in the Northern hemisphere. Helicia cochinchinensis Lour. is the only Proteaceae species in Japan. This study aimed to unveil the ecophysiological properties of H. cochinchinensis grown on Miyajima Island, Hiroshima, Japan. Methods Phosphorus (P) status and dynamics of soils in H. cochinchinensis habitats were measured. Plant P and nitrogen (N) concentrations of leaves were measured after digestion. Roots and rhizosheath soil were collected to assess root morphology and root exudates. Results Available P (Olsen-P) in soils in habitats of H. cochinchinensis was 0.46–3.7 mg P kg -1 soil. Citrate was the major carboxylate in root exudates and its concentration increased during cluster-root formation. Acid phosphatase activity was greater at the surface of cluster roots that on the surface of other roots and bulk soil, especially for mature cluster roots. Sparingly soluble organic P concentrations decreased in the rhizosheath soil of mature cluster roots. The P concentrations of H. cochinchinensis leaves were relatively low; 0.34–0.69 mg P g -1 DW and 0.15–0.29 mg P g -1 DW in mature and senesced leaves, respectively. The P demand of H. cochinchinensis was less than that of nearby trees, showing greater P-remobilization efficiency. Conclusions Phosphorus mobilization from unavailable P by cluster roots supported P uptake by H. cochinchinensis , and P remobilization from senescing leaves contributed to sustain growth under P-deficient conditions." @default.
- W4206543105 created "2022-01-26" @default.
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- W4206543105 date "2022-01-12" @default.
- W4206543105 modified "2023-09-27" @default.
- W4206543105 title "Ecophysiological properties of a cluster root-forming plant, Helicia cochinchinensis (Proteaceae) grown on Miyajima Island, Japan" @default.
- W4206543105 doi "https://doi.org/10.21203/rs.3.rs-1219032/v1" @default.
- W4206543105 hasPublicationYear "2022" @default.
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