Soil phosphorus availability determines the preference for direct or mycorrhizal phosphorus uptake pathway in maize

文献类型： 外文期刊

第一作者： Zhang, Lin

作者： Zhang, Lin;Chu, Qun;Feng, Gu;Zhou, Jianwei;Rengel, Zed;Rengel, Zed

作者机构：

关键词： Direct P uptake; Maize; Mycorrhizal P uptake; Preferential P uptake pathway; Trade-off

期刊名称：GEODERMA （ 影响因子：6.114； 五年影响因子：6.183 ）

ISSN： 0016-7061

年卷期： 2021 年 403 卷

页码：

收录情况： SCI

摘要： How plants balance different strategies to acquire resources from the environment is a basic question in biology and ecology. Phosphorus (P) uptake by mycorrhizal plants comprises direct pathway (DP) and mycorrhizal pathway (MP). It is unknown whether there is a trade-off between DP and MP and how plants govern selection and/or differential contributions of the two pathways. We used P-32 labelling technique to quantify P uptake by both pathways in three maize genotypes differing in P acquisition at Olsen P values of 4.5, 8 and 50 mg kg(-1), representing low, suboptimal and high P supplies, respectively. We calculated the preference index of P uptake (ratio of MP contribution to DP contribution), P-transporter-based preferential index, C investment index as (ratio of hyphal length to root length), and the P-efficiency-based preferential index. Our results showed that maize plants preferred MP at the suboptimal soil available P because both the C investment index and the P-efficiency-based preferential index were greatest at that P supply. Shoot P content showed a significant relationship with the P uptake preference index, suggesting shoot P demand governed the trade-off between DP and MP. In conclusion, the preference for DP or MP regarding P acquisition in maize shifts with changes in soil available P level. These findings could be harnessed to better manage mycorrhizal fungi to enhance the sustainability of agricultural crops in soils with suboptimal P availability.

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