Biosystematics and conservation: a case study with two enigmatic and uncommon species of Crassula from New Zealand.

Abstract:

BACKGROUND AND AIMS:Crassula hunua and C. ruamahanga have been taxonomically controversial. Here their distinctiveness is assessed so that their taxonomic and conservation status can be clarified. METHODS:Populations of these two species were analysed using morphological, chromosomal and DNA sequence data. KEY RESULTS:It proved impossible to differentiate between these two species using 12 key morphological characters. Populations were found to be chromosomally variable with 11 different chromosome numbers ranging from 2n = 42 to 2n = 100. Meiotic behaviour and levels of pollen stainability were both variable. Phylogenetic analyses showed that differences exist in both nuclear and plastid DNA sequences between individual plants, sometimes from the same population. CONCLUSIONS:The results suggest that these plants are a species complex that has evolved through interspecific hybridization and polyploidy. Their high levels of chromosomal and DNA sequence variation present a problem for their conservation.

journal_name

Ann Bot

journal_title

Annals of botany

authors

De Lange PJ,Heenan PB,Keeling DJ,Murray BG,Smissen R,Sykes WR

doi

10.1093/aob/mcm294

subject

Has Abstract

pub_date

2008-04-01 00:00:00

pages

881-99

issue

6

eissn

0305-7364

issn

1095-8290

pii

mcm294

journal_volume

101

pub_type

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