Relationship between phosphorus uptake via indigenous arbuscular mycorrhizal fungi and crop response: A P-32-labeling study

文献类型： 外文期刊

第一作者： Qin, Zefeng

作者： Qin, Zefeng;Peng, Yi;Feng, Gu;Christie, Peter;Zhang, Junling;Li, Xiaolin;Gai, Jingping;Qin, Zefeng;Gai, Jingping;Zhang, Junling;Li, Xiaolin;Gai, Jingping;Yang, Guojiang;Zhou, Jianwei

作者机构：

关键词： Indigenous arbuscular mycorrhizal fungi; P uptake pathways; Mycorrhizal responsiveness; P utilization efficiency; Community diversity

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：5.509； 五年影响因子：5.678 ）

ISSN： 0929-1393

年卷期： 2022 年 180 卷

页码：

收录情况： SCI

摘要： Arbuscular mycorrhizal (AM) fungi form potentially symbiotic associations with most crop species and potentially increase crop phosphorus (P) uptake in intensive cropping systems. Their widespread use, however, remains restrained by our limited understanding of the processes that determine the outcome of the associations. Here, we have used P-32 to quantify the delivery of P to maize (Zea mays L.) and wheat (Triticum aestivum L.) via indigenous AM fungi in compartmented pots under high- and low-P conditions. Soil P level was important in driving shoot P uptake via the direct mot pathway (DP) or the mycorrhizal pathway (MP). The MP contribution reached 81.8 and 75.8%, respectively, in maize and wheat at low P status but declined to 40.6 and 9.1% at high P. The abundance of intraradical and extraradical colonization and the relative abundance of Rhizophagus and shoot P utilization efficiency (PUE) significantly impacted the MP contribution. Larger mycorrhizal P and growth responses were closely related to a higher MP contribution and shoot PUE in maize but only P response was significantly related to the latter in wheat. These results suggest that crops can acquire considerable amounts of P via the MP with indigenous AM fungi, especially at low P levels, and highlight the importance of plant and AM fungal identity in regulating the relationship between hidden P uptake and symbiotic outcomes. Therefore, manipulation of fertilizer P application rates to optimize the abundance and assemblage of the indigenous AM fungi and crop PUE to increase MP activity and symbiotic outcomes may contribute to the efficient utilization of AM fungi in intensive cropping systems.

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