Accumulation patterns of tobacco root allelopathicals across different cropping durations and their correlation with continuous cropping challenges

作者：Fangfang Zhou, Yihong Pan, Xiaolong Zhang, Guobing Deng, Xiaoting Li, Yubin Xiong, Li Tang · 发表于：Frontiers in Plant Science · 年份：2024 · DOI：10.3389/fpls.2024.1326942 · 被引用次数：8 · 研究领域：Allelopathy and phytotoxic interactions、Plant-Microbe Interactions and Immunity、Genomics, phytochemicals, and oxidative stress

Introduction: Continuous cropping challenges have gradually emerged as pivotal factors limiting the sustainable development of agricultural production. Allelopathicals are considered to be the primary obstacles. However, there is limited information on allelopathic accumulation across various continuous cropping years and its correlation with the associated challenges. Methods: Tobacco was subjected to varying planting durations: 1 year (CR), 5 years (CC5), 10 years (CC10), and 15 years (CC15). Results: Our findings unveiled discernible disparities in tobacco growth patterns across diverse continuous cropping periods. Notably, the most pronounced challenges were observed in the CC5 category, characterized by yield reduction, tobacco black shank outbreaks, and a decline in beneficial flora. Conversely, CC15 exhibited a substantial reduction in challenges as the continuous cropping persisted with no significant differences when compared to CR. Within the tobacco rhizosphere, we identified 14 distinct allelopathic compounds, with 10 of these compounds displaying noteworthy variations among the four treatments. Redundancy analysis (RDA) revealed that eight allelopathic compounds exhibited autotoxic effects on tobacco growth, with MA, heptadecanoic acid, and VA ranking as the most potent inhibitors. Interaction network highlighted the pivotal roles of VA and EA in promoting pathogen proliferation and impeding the enrichment of 13 beneficial bacterial genera. Furthermore, a structu...