Karyotype analysis and polyploidy in Palaua and a comparison with its sister group Fuertesimalva (Malvaceae)

Palaua (Malveae, Malvaceae) comprises 15 species endemic to the hyperarid coastal desert of Chile and Peru. So far, chromosome counts have been known for two diploid species (2n= 2x= 10) only. Here we report new chromosome numbers for 12 species of Palaua and four of its sister group Fuertesimalva....

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Bibliographic Details
Published in:Journal of systematics and evolution : JSE 2010-05, Vol.48 (3), p.175-182
Main Authors: SCHNEIDER, Julio V, HUERTAS, Marilú L
Format: Article
Language:English
Subjects:
autopolyploidy
chromosome base number
desert
fluorochrome staining
lomas
Malveae
Urocarpidium
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Summary:Palaua (Malveae, Malvaceae) comprises 15 species endemic to the hyperarid coastal desert of Chile and Peru. So far, chromosome counts have been known for two diploid species (2n= 2x= 10) only. Here we report new chromosome numbers for 12 species of Palaua and four of its sister group Fuertesimalva. Karyotypes including 4′,6′‐diamidino‐2‐phenylindole dihydrochloride (DAPI)/chromomycin (CMA3) fluorescent banding are presented for selected species representative of each of the main clades of Palaua. An important finding is the discovery of polyploids in one exclusively tetraploid species (P. trisepala) and four species with mixed diploid and tetraploid cytotypes (P. dissecta, P. mollendoensis, P. moschata, and P. tomentosa). The diploid and tetraploid karyotypes are all unimodal, symmetrical and show one or two pairs of satellite chromosomes with their associated CMA+/DAPI− band depending on the cytotype. For some of the tetraploids an autopolyploid origin is suggested.
ISSN:1674-4918
1759-6831
DOI:10.1111/j.1759-6831.2010.00074.x