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Root Border Cells and Their Role in Plant Defense.

Root Border Cells and Their Role in Plant Defense.
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Hawes M, Allen C, Turgeon BG, Curlango-Rivera G, Minh Tran T, Huskey DA, Xiong Z,


Hawes M, Allen C, Turgeon BG, Curlango-Rivera G, Minh Tran T, Huskey DA, Xiong Z, (click to view)

Hawes M, Allen C, Turgeon BG, Curlango-Rivera G, Minh Tran T, Huskey DA, Xiong Z,

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Annual review of phytopathology 2016 05 2354() 143-61 doi 10.1146/annurev-phyto-080615-100140

Abstract

Root border cells separate from plant root tips and disperse into the soil environment. In most species, each root tip can produce thousands of metabolically active cells daily, with specialized patterns of gene expression. Their function has been an enduring mystery. Recent studies suggest that border cells operate in a manner similar to mammalian neutrophils: Both cell types export a complex of extracellular DNA (exDNA) and antimicrobial proteins that neutralize threats by trapping pathogens and thereby preventing invasion of host tissues. Extracellular DNases (exDNases) of pathogens promote virulence and systemic spread of the microbes. In plants, adding DNase I to root tips eliminates border cell extracellular traps and abolishes root tip resistance to infection. Mutation of genes encoding exDNase activity in plant-pathogenic bacteria (Ralstonia solanacearum) and fungi (Cochliobolus heterostrophus) results in reduced virulence. The study of exDNase activities in plant pathogens may yield new targets for disease control.

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