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Annual Review of Phytopathology

Volume 54, 2016

Root Border Cells and Their Role in Plant Defense

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 () and fungi () results in reduced virulence. The study of exDNase activities in plant pathogens may yield new targets for disease control.

Keyword(s): exDNA, exDNase, extracellular traps, rhizosphere, root cap slime
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2016-08-04
2024-04-25
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Root Border Cells and Their Role in Plant Defense
Annual Review of Phytopathology 54, 143 (2016); https://doi.org/10.1146/annurev-phyto-080615-100140
/content/journals/10.1146/annurev-phyto-080615-100140
/content/journals/10.1146/annurev-phyto-080615-100140
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