生物
种间竞争
根瘤菌
查尔酮合酶
间作
生长素
生态系统
植物
共生
农学
基因
生态学
生物化学
细菌
基因表达
遗传学
作者
Bai Li,Yuying Li,Huamao Wu,Fang-Fang Zhang,Chunjie Li,Xuexian Li,Hans Lambers,Long Li
标识
DOI:10.1073/pnas.1523580113
摘要
Significance Plant diversity often leads to an increase in ecosystem productivity, but the underpinning mechanisms remain poorly understood. We found that faba bean/maize intercropping enhances productivity, nodulation, and N 2 fixation of faba bean through interspecific root interactions. We provide a mechanism explaining how maize promotes N 2 fixation of faba bean, where root exudates from maize increase root hair deformation and nodulation in faba bean, double exudation of flavonoids (signaling compounds for rhizobia), and up-regulate the expression of a chalcone–flavanone isomerase gene involved in flavonoid synthesis, and genes mediating nodulation and auxin responses. Our results provide a mechanism for facilitative root–root interactions explaining how species diversity may enhance ecosystem productivity with important implications for developing sustainable agriculture.
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