Microbial community circadian rhythms have a broad influence on host health and even though light-induced environmental fluctuations could regulate microbial communities, the contribution of light to the circadian rhythms of rhizosphere microbial communities has received little attention. To address this gap, we monitored diel changes in the microbial communities in rice (Oryza sativa L.) rhizosphere soil under light–dark and constant dark regimes, identifying microbes with circadian rhythms caused by light exposure and microbial circadian clocks, respectively. While rhizosphere microbial communities displayed circadian rhythms under light–dark and constant dark regimes, taxa possessing circadian rhythms under the two conditions were dissimilar. Light exposure concealed microbial circadian clocks as a regulatory driver, leading to fewer ecological niches in light versus dark communities. These findings disentangle regulation mechanisms for circadian rhythms in the rice rhizosphere microbial communities and highlight the role of light-induced regulation of rhizosphere microbial communities.

微生物群落昼夜节律对宿主健康有广泛影响，尽管光诱导的环境波动可以调节微生物群落，但光对根际微生物群落昼夜节律的贡献却很少受到关注。为了弥补这一差距，我们监测了水稻微生物群落的昼夜变化（Oryza sativaL.) 根际土壤在明暗和恒定黑暗条件下，分别识别由光照和微生物生物钟引起的具有昼夜节律的微生物。虽然根际微生物群落在明暗和恒暗条件下表现出昼夜节律，但在这两种条件下具有昼夜节律的分类群是不同的。光照隐藏了作为调节驱动因素的微生物生物钟，导致光照与黑暗社区中的生态位更少。这些发现解开了水稻根际微生物群落昼夜节律的调节机制，并强调了光诱导调节根际微生物群落的作用。