A monophyletic origin of the B chromosomes ofBrachycome dichromosomatica (Asteraceae)

Houben, Andreas; Thompson, Nicole; Ahne, R.; Leach, Carolyn R.; Verlin, Dawn; Timmis, Jeremy N.

doi:10.1007/bf01090304

Cited by 36 publications

(32 citation statements)

References 21 publications

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“…An excellent investigation that demonstrated the importance of different repetitive DNAs in the B chromosomes of plants was conducted in Brachycome dichromosomatica. In this report, Houben et al (1999) found two different Bs, one small and another large, which showed at least one hybridization site for each of the repeated DNA sequences: Bd49, Bdm29 and an inactive rDNA segment, which suggested a possible monophyletic origin for these Bs.…”

Section: Discussionmentioning

confidence: 91%

The occurrence of different Bs in Cestrum intermedium and C. strigilatum (Solanaceae) evidenced by chromosome banding

Fregonezi

Rocha

Torezan

et al. 2004

Cytogenet Genome Res

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In this study, we examine the morphology, mitotic stability, meiotic behavior and the composition of heterochromatin of B chromosomes in Cestrum intermedium and C. strigilatum. The results showed that B chromosome number shows intraindividual variation in the root meristem, which seems to lead to a slight rate of B elimination in this somatic tissue. B chromosomes in both species were similar in size and shape, but differed with regard to the type, size and distribution of heterochromatin. Possible evolutionary pathways for B chromosome origin in Cestrum are discussed.

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Section: Discussionmentioning

confidence: 91%

The occurrence of different Bs in Cestrum intermedium and C. strigilatum (Solanaceae) evidenced by chromosome banding

Fregonezi

Rocha

Torezan

et al. 2004

Cytogenet Genome Res

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“…Inter-and intraspecifc chromosomal variations have been reported in some Brazilian genera, such as in Mikania (Ruas and Ruas, 1987;Ruas and Aguiar-Perecin, 1997;Maffei et al, 1999). Other examples of karyotypic variation in Asteraceae include the occurrence of cytodemes in Brachycome dichromosomatica, with 2n = 4, 8, 10, 12 and 16 (Watanabe et al, 1999a), as well as variations in the number and distribution of 45S rDNA sites and the occurrence of B-chromosomes (Houben et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

A karyotypic study of three southern Brazilian Asteraceae species using fluorescence in situ hybridization with a 45S rDNA probe and C-CMA3 banding

2004

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The Asteraceae, one of the largest families of flowering plants, contains about 1,100 genera and 20,000 species, and is well known for its extensive karyotypic variation. In this study, conventional Feulgen staining, C-CMA 3 banding, and fluorescence in situ hybridization with a 45S rDNA probe were used to determine the chromosome number and the number and physical position of GC-rich heterochromatin and 45S rDNA sites in three Asteraceae weed species (Crepis japonica, Galinsoga parviflora and Chaptalia nutans). The three species exhibited karyotype differences in the chromosome number and shape, as a commom feature of Asteraceae. However, the 45S rDNA sites always occurred on the short chromosomal arms, associated with GC-heterochromatin. Althought of these differences, it suggests that commom features of plant karyotype are maintained.

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“…The spontaneous generation of B's following interspecific crosses has been reported in, e.g., hybrids of Coix aquaticus and C. gigantea (Sapre and Deshpande 1987). The de novo formation of B's is most likely a rare event, as analyses of different B chromosome variants within species suggest a close relationship among different variants (Houben et al 1999).…”

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confidence: 99%

Molecular Evidence for Transcription of Genes on a B Chromosome in Crepis capillaris

et al. 2005

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Dispensable, supernumerary (B) chromosomes are found in diverse eukaryotic species. The origin and genetic consequences of B chromosomes have been the subjects of speculation for more than a century. Until now, there has been no molecular evidence that B chromosome DNA is transcribed and there is no unequivocal evidence as to their origin. B chromosomes are considered to be genetically inert although they appear to cause a variety of phenotypic effects. We report that members of one of two ribosomal RNA gene families that are confined to the B chromosomes of a plant, Crepis capillaris, are transcribed-thus providing the first molecular evidence of gene activity on B chromosomes. Sequence analysis of part of the A and B chromosome rRNA genes, together with comparisons with related species, indicates that the B chromosome rRNA genes originate from the A chromosome.

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A monophyletic origin of the B chromosomes ofBrachycome dichromosomatica (Asteraceae)

Cited by 36 publications

References 21 publications

The occurrence of different Bs in <i>Cestrum intermedium</i> and <i>C. strigilatum</i> (Solanaceae) evidenced by chromosome banding

The occurrence of different Bs in <i>Cestrum intermedium</i> and <i>C. strigilatum</i> (Solanaceae) evidenced by chromosome banding

A karyotypic study of three southern Brazilian Asteraceae species using fluorescence in situ hybridization with a 45S rDNA probe and C-CMA3 banding

Molecular Evidence for Transcription of Genes on a B Chromosome in Crepis capillaris

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