On the origin of the widespread self-compatible allotetraploid Capsella bursa-pastoris (Brassicaceae).

ABSTRACT: Polyploidy, or whole-genome duplication, is a common speciation mechanism in plants. An important barrier to polyploid establishment is a lack of compatible mates. Because self-compatibility alleviates this problem, it has long been hypothesized that there should be an association between polyploidy and self-compatibility (SC), but empirical support for this prediction is mixed. Here, we investigate whether the molecular makeup of the Brassicaceae self-incompatibility (SI) system, and specifically dominance relationships among S-haplotypes mediated by small RNAs, could facilitate loss of SI in allopolyploid crucifers. We focus on the allotetraploid species Capsella bursa-pastoris, which formed ~300 kya by hybridization and whole-genome duplication involving progenitors from the lineages of

SUBMITTER: Bachmann JA 

PROVIDER: S-EPMC8249383 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature