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

作　　者：Julio V SCHNEIDER Marilú L HUERTAS 

机构地区：[1]Systematic Botany,Biologie I,University of Leipzig [2]Botany and Molecular Evolution,Research Institute and Natural History Museum Senckenberg and Johann Wolfgang Goethe-Universitt

出　　处：《Journal of Systematics and Evolution》2010年第3期175-182,共8页植物分类学报（英文版）

基　　金：the Deutsche Forschungsgemeinschaft for providing funds to J.V.SCHNEIDER (DFG Schn 714/1-1) within the SPP 1127 "Radiations–origin of biodiversity";The Friedrich-Ebert Foundation for a Ph.D. studentship to M.L. HUERTAS;support from the SYNTHESYS Project(http://www.synthesys.info/) which is financed by theEuropean Community Research Infrastructure Actionunder the FP6 "Structuring the European ResearchArea" Programme (grant to J.V.S., ES-TAF 1879)

摘　　要：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.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.

关 键 词：AUTOPOLYPLOIDY chromosome base number desert fluorochrome staining lomas Malveae Urocarpidium. 

分 类 号：Q943[生物学—植物学]