Molecular Cytogenetics of the Genus Arabidopsis: In situ Localization of rDNA Sites, Chromosome Numbers and Diversity in Centromeric Heterochromatin |
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| Authors: | Maluszynska J; Heslop-Harrison J S |
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| Institution: | Department of Plant Anatomy and Cytology, Silesian University, Jagiellonska 28, 40-032 Katowice, Poland and Karyobiology Group, Department of Cell Biology, John Innes Centre for Plant Science Research, Colney Lane, Norwich NR4 7UH, UK |
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| Abstract: | We have used in situ hybridization to determine the number ofsites of rDNA in species in the genus Arabidopsis. A. wallichii(2n = 16) has one major pair of sites and one minor pair ofsites, while A. pumila and A. griffithiana (both 2n = 32) havesix major and two minor rDNA sites. A. thaliana (2n = 10) isknown to have two pairs of rDNA sites. a highly repeated para-centromericsequence from A. thaliana, pAL1, is absent in the other threespecies. Hence the A.thaliana genome is not present (or thecentromeric DNA has evolved substantially) in the polyploidspecies A. pumila and A. griffithiana. Analysis of Arabidopsisspecies is a valuable complement to the large programmes forgenetic analysis of A. thaliana.Copyright 1993, 1999 AcademicPress Arabidopsis, centromeric DNA, maps (genetic), nuclear architecture, repetitive DNA, ribosomal DNA, rDNA, evolution, Brassicaceae, Crucifereae, in situ hybridization |
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