Afterripening Pattern during Cold Stratification of Achenes of Ten Perennial Asteraceae from Eastern North America, and Evolutionary Implication

CAROL C. BASKIN, JERRY M. BASKIN, MARY A. LECK

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Abstract At 0‐ to 12‐week intervals, imbibed achenes of ten perennial Asteraceae from eastern North America were removed from 5°C (cold stratification) and tested for germination over a range of daily thermoperiods. The objective was to determine changes in the temperature requirements for germination as achenes came out of dormancy (after‐ripened). In Eupatorium fistulosum, Helenium autumnale, Kuhnia eupatorioides, Mikania scandens, Ratibida pinnata, Solidago altissima and Verbesina alternifolia, the minimum temperature for germination decreased during afterripening (Type 2 response), and in Aster divaricatus, Echinacea simulata and E. tennesseensis the minimum and maximum temperatures decreased and increased, respectively (Type 3 response). The majority of the 32 species of Asteraceae whose afterripening pattern has been investigated have a Type 2 response, and the family is one of many in eastern North America with species that have Type 2. We hypothesize that the ancestors giving rise to species with Type 2 were species with (1) nondormant seeds that required high temperatures for germination, or (2) dormant seeds that afterripened during warm (dry) winters and germinated only at high temperatures.

Original languageEnglish
Pages (from-to)61-65
Number of pages5
JournalPlant Species Biology
Volume8
Issue number1
DOIs
StatePublished - Jun 1993

Keywords

  • Asteraceae
  • Type 2 afterripening pattern
  • achene dormancy
  • cold stratification
  • perennials

ASJC Scopus subject areas

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

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