Abstract
The soybean leghemoglobin (Lb) genes are encoded in the plant genome as a small family of genes which are specifically activated in response to an infection of the root with Rhizobium japonicum. The soybean Lb gene family consists of four functional genes (Lba, Lbcl, Lbc2 and Lbc3), one pseudo gene and at least three truncated genes. About 7-8 days after infection the functional Lb genes are activated in the opposite order to which they are arranged in the soybean genome. About 12 days post infection there is a dramatic increase in the transcription of the Lb genes. In addition to the Lb genes other nodule specific plant genes (nodulins) are activated during development of the nodule. Some of the nodulin genes are also encoded in the soybean genome as small families of genes which are activated at the same time as the amplification of Lb gene transcription.
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