Effects of plant tissue permeability on invasion and population bottlenecks of a phytopathogen

Author:

Jiang GaofeiORCID,Zhang Yuling,Chen Min,Ramoneda JosepORCID,Han Liangliang,Shi Yu,Peyraud RémiORCID,Wang YikuiORCID,Shi XiaojunORCID,Chen XinpingORCID,Ding Wei,Jousset AlexandreORCID,Hikichi Yasufumi,Ohnishi Kouhei,Zhao Fang-JieORCID,Xu YangchunORCID,Shen QirongORCID,Dini-Andreote FranciscoORCID,Zhang Yong,Wei ZhongORCID

Abstract

AbstractPathogen genetic diversity varies in response to environmental changes. However, it remains unclear whether plant barriers to invasion could be considered a genetic bottleneck for phytopathogen populations. Here, we implement a barcoding approach to generate a pool of 90 isogenic and individually barcoded Ralstonia solanacearum strains. We used 90 of these strains to inoculate tomato plants with different degrees of physical permeability to invasion (intact roots, wounded roots and xylem inoculation) and quantify the phytopathogen population dynamics during invasion. Our results reveal that the permeability of plant roots impacts the degree of population bottleneck, genetic diversity, and composition of Ralstonia populations. We also find that selection is the main driver structuring pathogen populations when barriers to infection are less permeable, i.e., intact roots, the removal of root physical and immune barriers results in the predominance of stochasticity in population assembly. Taken together, our study suggests that plant root permeability constitutes a bottleneck for phytopathogen invasion and genetic diversity.

Publisher

Springer Science and Business Media LLC

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