Leaf nodule endosymbiotic Burkholderia confer targeted allelopathy to their Psychotria hosts
After 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 Ps...
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Veröffentlicht in: | Scientific reports 2021-11, Vol.11 (1), p.22465-15, Article 22465 |
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Sprache: | eng |
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Zusammenfassung: | After 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. |
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ISSN: | 2045-2322 2045-2322 |
DOI: | 10.1038/s41598-021-01867-2 |