Single cell-type metabolomics of Medicago truncatula border cells and their roles in host-microbe interactions
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Border cells are a specialized cell type surrounding the root apical meristematic region of many plant species, with the exception of the Brassicaceae family that possess characteristically different border-like cells. Border cells are held in place by a water soluble, self-secreted matrix consisting of polysaccharide mucilage, proteins, DNA, and metabolites. Many of these secreted compounds are bioactive, with functionalities in mediation of symbiont attraction and defense against pathogens. While they possess myriad qualities, the considerable contributions of border cells to the rhizosphere chemistry are often overlooked. Indeed, many plant root focused studies do not include or discuss border cells, thus excluding an important component of root functionality. Our interests are in metabolites secreted from individual root regions, with heavy emphasis on those specifically arising from border cells. The purpose of this review is to summarize current literature regarding metabolite secretions by specific root cell types and regions. In this, we aim to draw focus to border cell rhizosphere contributions to and manipulation of rhizosphere chemistry.
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Ph. D.