ISSN:
1432-072X
Keywords:
Key words Exopolysaccharide
;
Invasion
;
Tannin
;
Indeterminate nodules
;
Lotus
;
Leucaena
;
Rhizobium
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Rhizobium loti strain PN4115 (NZP2213 str-1) ineffectively nodulates Leucaena leucocephala, i.e., strain PN4115 induces nodulation (Nod+) and is able to invade these nodules (Inv+), but fails to fix nitrogen (Fix–). Strain PN4115 does not synthesize a flavolan-binding polysaccharide (FBP), which is synthesized by the fully effective (Nod+Inv+Fix+) R. loti strain PN184 (NZP2037 str-1). The FBP may offer protection from prodelphinidin-rich flavolans synthesized by Lc. leucocephala. In this work, we show that exopolysaccharide (EPS)-negative mutants derived from strain PN4115 have a more severe ineffective phenotype (Nod+Inv–Fix–) on Lc. leucocephala than strain PN4115. This suggests that EPS from strain PN4115 is functional during invasion of Lc. leucocephala and that the requirement for EPS precedes the requirement for FBP.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s002030050433
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