Author:
Georgiou Antri,Sieber Simon,Hsiao Chien-Chi,Grayfer Tatyana,Gorenflos López Jacob L.,Gademann Karl,Eberl Leo,Bailly Aurélien
Abstract
AbstractAfter a century of investigations, the function of the obligate betaproteobacterial endosymbionts accommodated in leaf nodules of tropical Rubiaceae remained enigmatic. We report that the α-d-glucose analogue (+)-streptol, systemically supplied by mature Ca.Burkholderia kirkii nodules to their Psychotria hosts, exhibits potent and selective root growth inhibiting activity. We provide compelling evidence that (+)-streptol specifically affects meristematic root cells transitioning to anisotropic elongation by disrupting cell wall organization in a mechanism of action that is distinct from canonical cellulose biosynthesis inhibitors. We observed no inhibitory or cytotoxic effects on organisms other than seed plants, further suggesting (+)-streptol as a bona fide allelochemical. We propose that the suppression of growth of plant competitors is a major driver of the formation and maintenance of the Psychotria–Burkholderia association. In addition to potential agricultural applications as a herbicidal agent, (+)-streptol might also prove useful to dissect plant cell and organ growth processes.
Funder
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Dr. Helmut Legerlotz Foundation
Publisher
Springer Science and Business Media LLC
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