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Quantitative cytogenetic analyses of autoploid and alloploid taxa in the Helianthus ciliaris group (Compositae)


Quantitative cytogenetic analyses of autoploid and alloploid taxa in the Helianthus ciliaris group (Compositae)



American Journal of Botany 81(8): 1063-1069



ISSN/ISBN: 0002-9122

DOI: 10.2307/2445301

Diploidy, tetraploidy, and hexaploidy occur in the Helianthus ciliaris complex. Quantitative cytogenetic analysis shows that both auto- and allotetraploids and auto-allohexaploids occur in H. ciliaris. There is evidence for pairing control mutations in and among populations of both cytotypes, and this should be expected with increasing age in any normal diploid or autopolyploid population. The autotetraploid populations contain the model genomes AAAA and the hexaploid AAAABB. The B genome may have been derived from diploid H. laciniatus whose range overlaps the tetraploid cytotype in Texas and New Mexico and may have provided the drought tolerance necessary for the hexaploid H. ciliaris cytotype to become a successful weed in more arid regions of its distribution.

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Accession: 002681558

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