Abstract
and to be colonized by arbuscular mycorrhiza (AM ) fungi (Harrison, 1997). Often, nodule formation by a Isoforms of endochitinase in soybean were studied in given bacterial strain is restricted to only a few host plant relation to root symbiosis. Five selected cultivars dif- genera, and varieties of a given legume species may diVer fering in their nodulation potential were inoculated in nodule formation when inoculated with a given strain. with two strains of Bradyrhizobium japonicum, the Specifically in soybean, allelic genes have been described broad host-range Rhizobium sp. NGR234, and with the which restrict nodulation of certain genotypes by certain mycorrhizal fungus Glomus mosseae. Total chitinase Bradyrhizobium strains ( Vest, 1970; Qian et al., 1996). activity in nodules was up to 7-fold higher than in Other, ‘broad host-range’ rhizobia exist: Rhizobium sp. uninoculated roots and in mycorrhizal roots. The chi- NGR234 is such an example, and it is able to induce tinase activity in nodules varied depending on the nodules on more than 110 genera of legumes as well
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