Plant Systematics and Evolution

, Volume 126, Issue 3, pp 323–330

Mitotic cycle time and DNA content in annual and perennialMicroseridinae (Compositae, Cichoriaceae)

  • H. James Price
  • Konrad Bachmann

DOI: 10.1007/BF00983368

Cite this article as:
Price, H.J. & Bachmann, K. Pl Syst Evol (1976) 126: 323. doi:10.1007/BF00983368


Within eight annual and perennialMicroseridinae species studied, the duration of the mitotic cycle is positively correlated with the nuclear DNA content, cycle time (hrs) = 7.3 + 0.32 × pg DNA/nucleus. Within the generaAgoseris andMicroseris, the annuals have lower DNA contents and more rapid mitotic cycle times than do the perennials. This relationship is predicted by the nucleotypic theory ofBennett. Annual species ofPyrrhopappus have relatively high DNA contents and a proportionately longer mitotic cycle time, but contrary to that expected by the nucleotypic theory as originally proposed have the fastest growth rate and shortest generation time observed in theMicroseridinae. This rapid developmental rate is discussed, nucleotypically, however, by analyzing relationships between DNA content, mitotic cycle time, and cell size.

Key words

Compositae Cichoriaceae Microseridinae DNA content mitotic cycle time annuals perennials developmental rates nucleotype 

Copyright information

© Springer-Verlag 1976

Authors and Affiliations

  • H. James Price
    • 1
  • Konrad Bachmann
    • 2
  1. 1.Genetics Section, Department of Plant SciencesTexas A & M UniversityCollege StationUSA
  2. 2.Fakultät für BiologieUniversität HeidelbergHeidelberg 1Federal Republic of Germany

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