Experimental Agriculture

Research Article

Nodulation of Tropical Legumes I. Specificity in the Rhizobium Symbiosis of Leucaena leucocephala

M. J. Trinicka1 p1

a1 Department of Agriculture, Stock and Fisheries Konedobu, Papua


Leucaena leucocephala (Lam.) de Wit. failed to nodulate with 94 of the 99 strains of Rhizobium tested, representing the seven recognized cross-inoculation groups of nodule bacteria. A group of legumes including L. leucocephala, Mimosa invisa Mart., M. pudica L., Acacia farnesiana (L.) Willd. and Sesbania spp. showed the properties of a cross-inoculation group of plants. Rhizobia isolated from these legumes were all fast-growers and nodulate L. leucocephala, often effectively, and also many other tropical legumes, including Vigna sinensis (L.) Savi ex Hassk., which are usually nodulated effectively with slow-growing root-nodule bacteria. The taxonomic significance of the results is discussed.

(Accepted February 27 1968)


p1 Present address: Institute of Agriculture, University of Western Australia, Perth, Australia.