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Karyotype analysis and polyploidy in Palaua and a comparison with its sister group Fuertesimalva (Malvaceae)
Author(s) -
SCHNEIDER Julio V,
HUERTAS Marilú L
Publication year - 2010
Publication title -
journal of systematics and evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.249
H-Index - 46
eISSN - 1759-6831
pISSN - 1674-4918
DOI - 10.1111/j.1759-6831.2010.00074.x
Subject(s) - karyotype , biology , ploidy , malvaceae , botany , chromosome , chromomycin a3 , dapi , genetics , gene , apoptosis
Abstract 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 (2 n = 2 x = 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 (CMA 3 ) 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.