The niche complementarity driven by rhizosphere interactions enhances phosphorus-use efficiency in maize/alfalfa mixture

文献类型： 外文期刊

第一作者： Wang, Liyang

作者： Wang, Liyang;Hou, Baicheng;Lyu, Yang;Zhang, Kai;Shen, Jianbo;Zhang, Deshan;Li, Haigang;Rengel, Zed;Rengel, Zed

作者机构：

关键词： Alfalfa (Medicago sativa L.); intercropping; Maize (Zea mays L.); phosphorus uptake; rhizosphere processes

期刊名称：FOOD AND ENERGY SECURITY （ 影响因子：4.109； 五年影响因子：8.33 ）

ISSN： 2048-3694

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收录情况： SCI

摘要： Rhizosphere interactions between intercropping maize and alfalfa to increase phosphorus (P) acquisition remain largely unknown. This study aimed to investigate the mechanisms underlying niche complementarity to increase P acquisition in the maize/alfalfa mixture by influencing root/rhizosphere interactions. Maize was grown alone (single maize) or with maize (maize/maize) or alfalfa (maize/alfalfa) with low P (30 mg P kg(-1)soil) and high P (150 mg P kg(-1)soil) supplies. The target maize had greater shoot biomass and P content when grown with alfalfa than maize. Compared with maize, alfalfa had higher secretion of carboxylates and acid phosphatase, suggesting a stronger capacity to mobilize soil P. Phosphorus deficiency also increased the specific root length and the proportion of thin roots (diameter < 0.2 mm) in alfalfa, and intercropped alfalfa had higher carboxylates secretion than monocropped one, indicating that alfalfa root traits were modified by both soil P supply and the identity of neighbor. Increased soil P availability by alfalfa root exudation and improved rhizosphere environment by thin alfalfa roots promoted shoot growth and P acquisition of maize in the maize/alfalfa mixture. The presence of maize increased the secretion of carboxylates from alfalfa roots, suggesting that the root interactions between maize and alfalfa are crucial for improving P-use efficiency and productivity in intercropping.

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