Polymorphism of lectin genes in <Emphasis Type="Italic">Lathyrus</Emphasis> plants |
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Authors: | O V Chubukova Al Kh Baymiev An Kh Baymiev |
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Institution: | (1) Department of Zoology, Stockholm University, 106 91 Stockholm, Sweden |
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Abstract: | The carbohydrate-binding sequences of the lectin genes from spring vetchling Lathyrus vernus (L.) Bernh., marsh vetchling L. palustris (L.), and Gmelin’s vetchling L. gmelinii (Fitsch) (Fabaceae) were determined. Computer-aided analysis revealed substantial differences between nucleotide and predicted
amino acid sequences of the lectin gene regions examined in each of the three vetchling species tested. In the phylogenetic
trees based on sequence similarity of carbohydrate-biding regions of legume lectins, the sequences examined formed a compact
cluster with the lectin genes of the plants belonging to the tribe Fabeae. In each plant, L. vernus, L. palustris, and L. gmelinii, three different lectin-encoding genes were detected. Most of the substitutions were identified within the gene sequence
responsible for coding the carbohydrate-binding protein regions. This finding may explain different affinity of these lectins
to different carbohydrates, and as a consequence, can affect the plant host specificity upon development of symbiosis with
rhizobium bacteria. |
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