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Chromosome numbers in Compositae. XVIII.

G D Carr1, R M King, A M Powell

  • 1Department of Botany, University of Hawaii at Manoa, Honolulu, Hawaii 96822;

American Journal of Botany
|July 16, 1999
PubMed
Summary
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This study reports new chromosome numbers for 66 Compositae species and several genera, expanding cytogenetic knowledge across diverse global regions. These findings contribute valuable data to the understanding of plant evolution and diversity.

Area of Science:

  • Botany
  • Cytogenetics
  • Plant Science

Background:

  • The Compositae family is a large and diverse group of flowering plants.
  • Cytogenetic data, including chromosome numbers, are crucial for understanding plant evolution and taxonomy.
  • Previous cytogenetic information for many Compositae species and genera was limited.

Purpose of the Study:

  • To determine chromosome numbers and other cytogenetic data for a large number of Compositae collections.
  • To provide first reports of chromosome numbers for numerous species and genera.
  • To expand the understanding of cytogenetic diversity within the Compositae family.

Main Methods:

  • Microsporocytes from 316 plant collections were analyzed.
  • Collections were sourced from Africa, Australia, Mexico, Central America, and South America.

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  • Standard cytogenetic techniques were employed to determine chromosome counts.

    • Main Results:

    • Chromosome numbers were reported for 316 collections across 13 Compositae tribes.
    • First reports are presented for 66 species and the genera Cassinia, Feldstonia, Gochnatia, and Pseudoconyza.
    • New chromosome numbers were established for 10 genera and 13 additional species.

    Conclusions:

    • The study significantly expands the known cytogenetic data for the Compositae family.
    • The findings provide a foundation for future phylogenetic and evolutionary studies within Compositae.
    • This research highlights the cytogenetic diversity present in various geographical regions.