Chromosome evolution in 'Bulbine glauca' (Asphodelaceae or Xanthorrhoeaceae subfam. Asphodeloideae) indicates six species, not one

Author(s)
Moore, Iain S F
Brown, Elizabeth A
Telford, Ian R H
Bruhl, Jeremy J
Publication Date
2016
Abstract
￵￵The genus 'Bulbine' Wolf has ~130 species in Africa and only seven species in Australia. Base chromosome numbers in African and Australian 'Bulbine' are x = 7 and x = 12, respectively. This raises the possibility of Australian 'Bulbine' being of polyploidy origin or, alternatively African 'Bulbine' may have evolved through dysploid reduction. Previous chromosome counts in 'Bulbine glauca' (Raf.) E.M.Watson were predominantly 2n = 46, with aneuploid numbers of 2n = 45, 44, 48, 47, 40 and 41 also being encountered within and between populations. Novel chromosome counts are presented here for a wide sample of populations of 'B. glauca', occurring on volcanic and granite outcrops along the New South Wales and Victorian tablelands and on granite outcrops in Tasmania. Chromosome numbers for 'Bulbine crassa' D.I.Morris and Duretto is 2n = 26. The modal chromosome count for 'B. glauca' is confirmed as 2n = 46 with no evidence of aneuploidy. The species complex shows a variable asymmetric karyotype across its distribution, indicating karyotypic evolution involving structural rearrangements. There appear to be six distinctive groups within the complex based on karyomorphology. Evolutionary changes in both 'B. glauca s. lat.' and 'B. crassa' appear to have not involved recent polyploidy. Variation in chromosome morphology across the 'B. glauca' complex is consistent with our morphological evidence of more than one species.
Citation
Australian Journal of Botany, 64(3), p. 206-218
ISSN
1444-9862
0067-1924
Link
Publisher
CSIRO Publishing
Title
Chromosome evolution in 'Bulbine glauca' (Asphodelaceae or Xanthorrhoeaceae subfam. Asphodeloideae) indicates six species, not one
Type of document
Journal Article
Entity Type
Publication

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