Germination Response Patterns during Dormancy Loss in Achenes of Six Perennial Asteraceae from Texas, USA

CAROL C. BASKIN, JERRY M. BASKIN, O. W. VAN AUKEN

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Abstract When subjected to simulated habitat temperatures, achenes of six perennial Asteraceae from southcentral Texas came out of dormancy during summer. In the early stages of dormancy loss, achenes of Erigeron modestus, Gaillardia suavis and Hymenoxys scaposa germinated (to ≥ 10%) in light at 12/12 hr daily thermoperiods of 15/6, 20/10 and 25/15°C and those of Pinaropappus roseus at 15/6 and 20/10°C. After additional dormancy loss, achenes of these four species also germinated at 30/15 and 35/20°C. Achenes of these four species had a Type 1 germination response pattern, which heretofore has not been reported in perennial Asteraceae. Achenes of Chaptalia nutans first germinated (to ≥ 10%) at 20/10 and 25/15°C and those of Hymenopappus scabiosaeus at 20/10°C, but with further loss of dormancy achenes of both species also germinated at 15/6, 30/15 and 35/20°C. Thus, achenes of these two species had a Type 3 pattern. This is the first report of perennials in any family with a Type 3 response pattern whose seeds come out of dormancy during summer. Presence of annual and perennial Asteraceae with Type 2 in temperate eastern North America and annual and perennial Asteraceae with Type 1 in southcentral Texas causes us to conclude that climate is more important than the type of life cycle in determining the type of germination response pattern.

Original languageEnglish
Pages (from-to)113-117
Number of pages5
JournalPlant Species Biology
Volume9
Issue number2
DOIs
StatePublished - Aug 1994

Keywords

  • Asteraceae
  • achene dormancy
  • annuals
  • germination response patterns
  • perennials
  • temperature requirements for germination

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science

Fingerprint

Dive into the research topics of 'Germination Response Patterns during Dormancy Loss in Achenes of Six Perennial Asteraceae from Texas, USA'. Together they form a unique fingerprint.

Cite this