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(American Journal of Botany. 1999;86:974-979.)
© 1999 Botanical Society of America, Inc.

Comparison of common cytotypesof Andropogon gerardii(Andropogoneae, Poaceae)1

Kathleen H. Keeler2 and Geoffrey A. Davis

School of Biological Sciences, University of Nebraska, Lincoln Nebraska 68588-0118

Many plant species contain populations with more than one polyploid cytotype, but little is known of the mechanisms maintaining several cytotypes in a population. Andropogon gerardii cytotypes were compared to evaluate different models of autopolyploid cytotype coexistence. The enneaploid (90 chromosome, 9x) cytotype was found to be larger and taller than the hexaploid (60 chromosome, 6x) cytotype. Seed production is significantly more efficient in hexaploids, but seed production per area was not significantly different. The two cytotypes are not exomorphologically separable in the field because of great plasticity in response to environmental variation and wide variation within each cytotype. These data suggest cytotypic variation is maintained by natural selection.

Key Words: Andropogon gerardii • cytotype • enneaploid • hexaploid • Poaceae • polyploidy




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J. Suda, H. Weiss-Schneeweiss, A. Tribsch, G. M. Schneeweiss, P. Travnicek, and P. Schonswetter
Complex distribution patterns of di-, tetra-, and hexaploid cytotypes in the European high mountain plant Senecio carniolicus (Asteraceae)
Am. J. Botany, August 1, 2007; 94(8): 1391 - 1401.
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