Plant Systematics and Evolution

, Volume 138, Issue 3–4, pp 235–246 | Cite as

Genetic determination of pappus part number in the annual hybridMicroseris B 87 (Asteraceae—Lactuceae)

  • Konrad Bachmann
  • Kenton L. Chambers
  • H. James Price


The ChileanMicroseris pygmaea has a ten-part paleaceous pappus while the CalifornianM. bigelovii has five pappus parts on each achene. Hybrids between the two species have between five and ten pappus parts with averages below 7.5. Hybrid B 87 has an F 1 average value of 6.7 pappus parts. 140 F 2 plants were raised from this hybrid, and 12 F 3 families were obtained by selfing from F 2 plants. One larger F 4 family has been raised. Pappus part number in all of these is still canalized between 5 and 10. Variation within these limits is genetically determined by a quantitatively acting polygenic system. Modeling of this system suggests that a minimum of four, but probably not many more, genes are involved. This opens the possibility of a complete genetic analysis of the system.

Key words

Angiosperms Asteraceae Lactuceae Microseris Canalized numbers quantitative genetics evolutionary genetics pappus parts 


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Copyright information

© Springer-Verlag 1981

Authors and Affiliations

  • Konrad Bachmann
    • 1
  • Kenton L. Chambers
    • 2
  • H. James Price
    • 3
  1. 1.Premedical Biology ProgramUniversity of HeidelbergHeidelberg 1Federal Republic of Germany
  2. 2.Herbarium, Department of BotanyOregon State UniversityCorvallisUSA
  3. 3.Department of Plant SciencesTexas A and M UniversityCollege StationUSA

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