Well-developed root systems and a nitrogen-rich rhizosphere recruit key bacterial taxa to resist disease invasion of field crop

IF 6 1区农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY

Agriculture, Ecosystems & Environment Pub Date : 2024-09-05 DOI:10.1016/j.agee.2024.109279

Junhui Li , Yidong Zou , Kun Yang , Yi Zhu , Qiyun Zhou , Lanjun Shao , Jia Gong , Shuguang Peng , Guangjue Peng , Tian Qin , Meijie Tian , Yunhe Tian , Yongjun Liu , Can Wang , Ruiwen Hu , Juan Li

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引用次数: 0

Abstract

Crop rotation patterns have important effects on crop growth and disease occurrence, but there is a lack of understanding of how crop root systems and inter-root environments affect the bacterial communities involved in plant disease resistance under different crop rotation patterns. In this study, two crop rotation patterns, tobacco-rice (TR) and tobacco-maize (TM), were set up in a tobacco growing region of southern China, and the differences in soil bacterial communities and the mechanisms of their influence on the occurrence of tobacco diseases were investigated under the two rotation patterns. The results showed that the disease incidence rate of tobacco under TR crop rotation was low, only 4.92 %, while the incidence rate under TM crop rotation was as high as 34.44 %. The bacterial genera affecting the disease incidence of tobacco were identified through microbial network and correlation analysis, and a total of 12 genera were identified as significantly correlated with the disease incidence rate of tobacco in the soil layers of 0–10 cm and 10–20 cm. Of these, four genera (Acidothermus, Chujaibacter, Rhodanobacter, and Nitrospira) were significantly and negatively correlated with the incidence rate, and also more abundant in the bacterial community of TR. Soil nitrogen nutrients and pH were the main soil factors influencing the differences in bacterial communities between the two rotation patterns. Partial least squares path model (PLS-PM) analysis revealed that the key bacterial taxa directly influenced the disease incidence of tobacco in both the 0–10 cm and 10–20 cm soil layers. Interestingly, the key bacterial taxa were directly influenced by soil nutrients in the 0–10 cm soil layer and by the tobacco root system in the 10–20 cm soil layer. In summary, nitrogen-rich nutrients and well-developed plant root systems are conducive to shaping soil bacterial communities with disease-resistant properties, reducing the disease incidence of tobacco. This study also provides new research perspectives for sustainable agricultural development and crop disease control.

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发达的根系和富含氮素的根瘤层可招引关键的细菌类群，抵御大田作物的病害入侵

轮作模式对作物生长和病害发生有重要影响，但对不同轮作模式下作物根系和根际环境如何影响参与植物抗病的细菌群落还缺乏了解。本研究在中国南方烟草种植区建立了烟草-水稻（TR）和烟草-玉米（TM）两种轮作模式，研究了两种轮作模式下土壤细菌群落的差异及其对烟草病害发生的影响机制。结果表明，TR 轮作模式下烟草病害发生率较低，仅为 4.92%，而 TM 轮作模式下病害发生率高达 34.44%。通过微生物网络和相关性分析，确定了影响烟草发病率的细菌属，共有 12 个菌属与 0-10 厘米和 10-20 厘米土层的烟草发病率显著相关。其中，4 个菌属（Acidothermus、Chujaibacter、Rhodanobacter 和 Nitrospira）与发病率呈显著负相关，在 TR 的细菌群落中含量也较高。土壤氮素养分和 pH 值是影响两种轮作模式细菌群落差异的主要土壤因子。偏最小二乘路径模型（PLS-PM）分析表明，关键细菌类群直接影响 0-10 厘米和 10-20 厘米土层中烟草的发病率。有趣的是，关键细菌类群直接受 0-10 厘米土层土壤养分和 10-20 厘米土层烟草根系的影响。总之，富氮养分和发达的植物根系有利于形成具有抗病特性的土壤细菌群落，从而降低烟草的病害发生率。这项研究也为农业可持续发展和作物病害防治提供了新的研究视角。

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来源期刊

Agriculture, Ecosystems & Environment 环境科学-环境科学

CiteScore

11.70

自引率

9.10%

发文量

392

审稿时长

26 days

期刊介绍： Agriculture, Ecosystems and Environment publishes scientific articles dealing with the interface between agroecosystems and the natural environment, specifically how agriculture influences the environment and how changes in that environment impact agroecosystems. Preference is given to papers from experimental and observational research at the field, system or landscape level, from studies that enhance our understanding of processes using data-based biophysical modelling, and papers that bridge scientific disciplines and integrate knowledge. All papers should be placed in an international or wide comparative context.