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Dernière mise à jour : Mai 2018

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Determinism of bacterial transmission to seeds

Transmission to seeds is a critical step in the ecology of many plant pathogenic bacteria, but also in the epidemiology of bacterial plant diseases. Bacteria survive in/on seeds for a long time, sometimes longer than the lifetime of the seed itself. According to the pathogen, contaminated seeds may represent the major source of inoculum in the field. Blocking this inoculum source is thus a major goal to efficiently control seed-transmitted bacterial diseases. In order to identify and characterize the molecular determinants involved in the transmission of Xanthomonas axonopodis pv. phaseoli to bean (Phaseolus vulgaris L.) seeds, we developed random and targeted strategies. Techniques used numerous biotests, and functional studies.



transmission graine/bacterie

The various ways used by plant pathogenic bacteria to infect seeds.

Recent results in EmerSys showed that various ways can be used by plant pathogenic bacteria to infect seeds. In a compatible situation, transmission to seeds mainly occurs through the stigma (floral pathway), but also through the vascular system. In  an incompatible interaction, , transmission to seeds only occurs through the floral pathway. Functional approaches demonstrated that the transmission through the floral pathway is dependent on a functional Type 3 secretion system, and also of the ability of bacterial strains to aggregate. Alternatively, transmission through the floral pathway involves the Type 3 secretion system, but does not involve the ability of bacteria to aggregate. Finally, studies by EmerSys highlighted the occurrence of a non-host carriage: germinated seeds may be colonized on their surface by non-host bacteria such as E.coli. The multiplication of these bacteria during non-host carriage may reach levels similar to that of plant pathogenic bacteria on their hosts. This is due to the lack of induction od defense reactions on the germinated seeds in response to the colonization by bacteria.

See also

Ici, les autres thématiques de l'équipe