into the mechanisms of nodule formation showed that the ENOD40 gene, coding for a 12-13 amino acid protein [41], is up-regulated during nodule formation [3].

Connection to root structure

Root nodules apparently have evolved three times within the Fabaceae but are rare outside that family. The propensity of these plants to develop root nodules seems to relate to their root structure. In particular, a tendency to develop lateral roots in response to abscisic acid

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