ABSTRACT

The rhizosheath is an important drought-adaptive trait in roots of many angiosperms and has been regarded as a potential trait for future agricultural sustainability. In recent studies, we found that rice roots could form a pronounced rhizosheath under moderate soil drying (MSD) but not under continuous flooding irrigation (CF). The formation of rhizosheaths substantially changes the microbial community structure in endosphere root tissues and the rhizosphere in rice, which may induce a plant immune response. However, the manner by which the formation of rhizosheaths regulates the immune system of roots remains largely unknown. Here, we have analyzed the root transcriptomes of drought-tolerant rice and drought-sensitive rice under both MSD (rhizosheath-root) and CF (root without rhizosheath) conditions. Our results suggest that rhizosheath-associated microbes may trigger plant immune pathways in root under MSD, including the first line of defense component pattern-triggered immunity and the second line of defense component effector-triggered immunity. These data expand our understanding of rhizosheath-associated microbes and plant interactions.

摘要

根鞘是许多被子植物根部重要的干旱适应性状，被认为是未来农业可持续性的潜在性状。在最近的研究中，我们发现水稻根系可以在适度土壤干燥（MSD）下形成明显的根鞘，但在连续漫灌（CF）下不会。根鞘的形成显着改变了根际根组织和水稻根际的微生物群落结构，这可能会诱导植物免疫反应。然而，根鞘的形成调节根部免疫系统的方式仍然很大程度上未知。在这里，我们分析了在 MSD（根鞘根）和 CF（没有根鞘的根）条件下耐旱水稻和干旱敏感水稻的根转录组。我们的研究结果表明，根鞘相关微生物可能在 MSD 下触发植物根部的免疫途径，包括第一道防线成分模式触发免疫和第二道防线成分效应器触发免疫。这些数据扩展了我们对根鞘相关微生物和植物相互作用的理解。