Genotypic variation of rice in phosphorus acquisition from iron phosphate: Contributions of root morphology and phosphorus uptake kinetics

文献类型： 外文期刊

第一作者： Li, Y. F.

作者： Li, Y. F.;Luo, A. C.;Wei, X. H.;Yao, X. G.

作者机构：

关键词： Oryza sativa;iron phosphate;phosphorus deficiency;root morphology;sparingly soluble phosphate;uptake kinetics

期刊名称：RUSSIAN JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：1.481； 五年影响因子：1.608 ）

ISSN： 1021-4437

年卷期： 2007 年 54 卷 2 期

页码：

收录情况： SCI

摘要： To elucidate the contributions of rice root morphology and phosphorus uptake kinetics to P uptake by rice from iron phosphate, a sand culture experiment with either sufficient P supply (control treatment, 10 mg P/l as NaH2PO4) or Fe-P as the only source of P (40 mg P/pot as FePO4 x 4H(2)O) and a solution culture experiment supplied with either sufficient P (10 mg P/l) or deficient P (0.5 mg P/l) were conducted. Eight rice cultivars, which differed in P uptake from Fe-P, were investigated. Plant P uptake, root morphology, and P uptake kinetics were determined. There were significant (P < 0.05) genotypic variations in both plant dry weight and P uptake per plant among eight rice (Otyza sativa L.) cultivars when supplied with Fe-P as the P source. The Fe-P treatment significantly (P < 0.05) decreased plant dry weight, P uptake per plant, and P concentration in plant dry matter of all cultivars in comparison with the control plants. In Fe-P treated plants, significant (P < 0.05) genotypic variation was shown in root morphology, including root length, surface area, volume, and number of lateral roots. The P uptake per plant from Fe-P by rice was significantly (P < 0.05) correlated with root surface area and root volume as well as with the number of lateral roots, suggesting that the ability of rice to absorb P from Fe-P was closely related to root morphology. Low P supply in solution significantly increased the I-max (P < 0.05), but significantly decreased the K-M (P < 0.05) for P absorption by all rice cultivars. We supposed that kinetic characteristics of root P uptake could not account for the ability office to absorb P from Fe-P.

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