HRPL NEGATIVELY REGULATES FLAGELLAR SYSTEM IN ERWINIA AMYLOVORA

S. Cesbron, M.N. Brisset, M. Tharaud, J.P. Paulin
Several previous works seem to indicate that flagellar and hrp genes of Erwinia amylovora are counter-regulated. In the present paper, this hypothesis is confirmed by the analysis of several parameters linked to flagella synthesis in E. amylovora grown in hrp- or non hrp-inducing conditions. Moreover, amongst the various hrp mutants tested, the hrpL regulatory mutant only was more motile, produced more flagellins and showed more flagella than the wild-type strain when cultivated on a hrp-inducing medium. A plasmid carrying hrpL introduced into a hrpL mutant decreased its motility and flagellin production. These results strongly suggest that flagellar synthesis of E. amylovora is under the negative control of HrpL, a positive regulator of hrp genes.
Cesbron, S., Brisset, M.N., Tharaud, M. and Paulin, J.P. (2006). HRPL NEGATIVELY REGULATES FLAGELLAR SYSTEM IN ERWINIA AMYLOVORA. Acta Hortic. 704, 407-408
DOI: 10.17660/ActaHortic.2006.704.64
https://doi.org/10.17660/ActaHortic.2006.704.64
Erwinia amylovora, hrpL, flagellin, motility
English

Acta Horticulturae