On the origin and evolution of apomixis in Boechera.


Journal Article

The genetic mechanisms causing seed development by gametophytic apomixis in plants are predominantly unknown. As apomixis is consistently associated with hybridity and polyploidy, these confounding factors may either (a) be the underlying mechanism for the expression of apomixis, or (b) obscure the genetic factors which cause apomixis. To distinguish between these hypotheses, we analyzed the population genetic patterns of diploid and triploid apomictic lineages and their sexual progenitors in the genus Boechera (Brassicaceae). We find that while triploid apomixis is associated with hybridization, the majority of diploid apomictic lineages are likely the product of intra-specific crosses. We then show that these diploid apomicts are more likely to sire triploid apomictic lineages than conspecific sexuals. Combined with flow cytometric seed screen phenotyping for male and female components of apomixis, our analyses demonstrate that hybridization is an indirect correlate of apomixis in Boechera.

Full Text

Duke Authors

Cited Authors

  • Lovell, JT; Aliyu, OM; Mau, M; Schranz, ME; Koch, M; Kiefer, C; Song, B-H; Mitchell-Olds, T; Sharbel, TF

Published Date

  • December 2013

Published In

Volume / Issue

  • 26 / 4

Start / End Page

  • 309 - 315

PubMed ID

  • 23783772

Pubmed Central ID

  • 23783772

Electronic International Standard Serial Number (EISSN)

  • 2194-7961

International Standard Serial Number (ISSN)

  • 2194-7953

Digital Object Identifier (DOI)

  • 10.1007/s00497-013-0218-7


  • eng