New Zealand Journal of Agricultural Research abstracts
Symbiotic relationship between Rhizobium leguminosarum biovar
trifolii and Trifolium nigrescens
Heather N. Pryor
W. L. Lowther
AgResearch
Invermay Agricultural Centre
Private Bag 50 034
Mosgiel, New Zealand
Abstract Recommended strains of rhizobia for Trifolium
repens and T. subterraneum, and rhizobia isolated from T. angustifolium
and T. pratense root nodules, were used to inoculate seven accessions
of T. nigrescens and their own macrosymbiont host plants growing in
N-free media. When inoculated with the strain of rhizobia recommended for
T. subterraneum, foliage weights of six of the seven T. nigrescens
accessions were either the highest, or not significantly less than the highest.
This supports the inclusion of T. nigrescens in the T. subterraneum
group when grouping species which respond similarly symbiotically. The response
of foliage weights of T. subterraneum and T. repens plants
to inoculation with the strain of rhizobia isolated from T. angustifolium
was similar to that following inoculation with the recommended strain for
T. repens, rather than with the recommended strain for T. subterraneum.
This result indicates that T. angustifolium should be included in
the T. repens group when grouping species which respond similarly
in symbiosis.
Keywords N-fixation; rhizobia; Trifolium angustifolium;
Trifolium nigrescens; Trifolium repens; Trifolium subterraneum
A02004 Received 4 February 2002; accepted 17 June 2002; published 30
September 2002
New Zealand Journal of Agricultural Research, 2002, Vol. 45: 145-149
0028-8233/02/4503-0145 $7.00/0 © The Royal Society of New Zealand
2002
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