Differential display was applied in order to clone cDNAs expressed exclusively or predominantly in nodules, compared to uninoculated root tissue of Galega orientalis. Forty-five fragments were unique for nodule RNA. These fragments were reamplified and cloned. Six of them produced a nodule-specific signal on Northern hybridization. These six fragments were sequenced. Five of the sequenced fragments showed homology to nodulin-gene sequences in databases, among them Vicia faba mRNA for protein showing partial homology with Medicago sativa nodulin-25 (Nms25), Pisum sativum PsN466, V. faba CCP2 and CCP4, P. sativum ENOD3, and Maackia amurensis ENOD2. The remaining sequence had no significant homology with sequences in the databanks. Full-size cDNA for the homologue to V. faba mRNA for the protein showing partial homology with M. sativa nodulin-25 (Nms25) and P. sativum PsN466 were cloned and sequenced.
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