Adaptive evolution in the Arabidopsis MADS-box gene family inferred from its complete resolved phylogeny.

ABSTRACT: Gene duplication is a substrate of evolution. However, the relative importance of positive selection versus relaxation of constraints in the functional divergence of gene copies is still under debate. Plant MADS-box genes encode transcriptional regulators key in various aspects of development and have undergone extensive duplications to form a large family. We recovered 104 MADS sequences from the Arabidopsis genome. Bayesian phylogenetic trees recover type II lineage as a monophyletic group and resolve a branching sequence of monophyletic groups within this lineage. The type I lineage is comprised of several divergent groups. However, contrasting gene structure and patterns of chromosomal distribution between type I and II sequences suggest that they had different evolutionary histories a

SUBMITTER: Martinez-Castilla LP 

PROVIDER: S-EPMC263827 | biostudies-literature | 2003 Nov

REPOSITORIES: biostudies-literature