Evolutionary considerations of the presence of both morphophysiological and physiological seed dormancy in the highly advanced euasterids II order Dipsacales

Jerry M. Baskin, Siti N. Hidayati, Carol C. Baskin, Jeffrey L. Walck, Zhen Ying Huang, Ching Te Chien

Research output: Contribution to journalReview articlepeer-review

11 Scopus citations

Abstract

Although the underdeveloped embryo, and thus morphological (MD) or morphophysiological (MPD) seed dormancy, is basal in angiosperms, it also occurs in advanced groups. A synthesis of the literature, combining phylogeny and the kind of seed dormancy in the highly evolutionary advanced order Dipsacales, shows that MPD (or MD) occurs throughout all clades except the most advanced one, Valerina. Seeds of taxa in the Valerina clade have fully developed embryos and physiological dormancy (PD) or are non-dormant (ND); thus, PD and ND are derived conditions in Dipsacales. Assuming that types of seed dormancy have not changed since the Early Tertiary, the fossil record suggests that MPD (or MD) was present in extant genera of Dipsacales by the Palaeocene, but PD (or ND) not until the Miocene. Molecular dating indicates that the ages of dipsacalean lineages with MPD and PD are older than those indicated by the fossil evidence.

Original languageEnglish
Pages (from-to)233-242
Number of pages10
JournalSeed Science Research
Volume16
Issue number4
DOIs
StatePublished - Dec 2006

Keywords

  • Dipsacales
  • Evolution of seed dormancy
  • Fossil fruits and seeds
  • Morphophysiological dormancy
  • Phylogeny
  • Physiological dormancy
  • Underdeveloped embryo

ASJC Scopus subject areas

  • Plant Science

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