Dualistic MADS-box evolution forged legume diversity post-WGD.

ABSTRACT: The MADS-box gene family plays a central role in plant development and adaptation, yet its evolutionary history in legumes is remarkably complex. In this study, we performed a pangenomic analysis across 52 legume species, identifying 4,872 MADS-box genes and reconstructing their phylogeny into 16 subfamilies. Our analysis uncovered a pervasive dualistic evolutionary model driven by distinct duplication mechanisms. Structurally, the genes fall into two categories: the compact, intron-poor Type I and the complex, intron-rich Type II. We demonstrate that whole-genome duplication (WGD) serves as the major driver (42.2%) behind the expansion of the conserved core genome, which includes key floral regulators such as the "ABCDE model" genes. These WGD-derived genes are under strong purifying sele

SUBMITTER: Nan H 

PROVIDER: S-EPMC12853372 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature