TITLE

High ploidy diversity and distinct patterns of cytotype distribution in a widespread species of Oxalis in the Greater Cape Floristic Region

AUTHOR(S)
Krejčíková, Jana; Sudová, Radka; Lučanová, Magdalena; Trávníček, Pavel; Urfus, Tomáš; Vít, Petr; Weiss-Schneeweiss, Hanna; Kolano, Bożena; Oberlander, Kenneth; Dreyer, Leanne L.; Suda, Jan
PUB. DATE
April 2013
SOURCE
Annals of Botany;Apr2013, Vol. 111 Issue 4, p641
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Background and Aims Genome duplication is widely acknowledged as a major force in the evolution of angiosperms, although the incidence of polyploidy in different floras may differ dramatically. The Greater Cape Floristic Region of southern Africa is one of the world's biodiversity hotspots and is considered depauperate in polyploids. To test this assumption, ploidy variation was assessed in a widespread member of the largest geophytic genus in the Cape flora: Oxalis obtusa. Methods DNA flow cytometry complemented by confirmatory chromosome counts was used to determine ploidy levels in 355 populations of O. obtusa (1014 individuals) across its entire distribution range. Ecological differentiation among cytotypes was tested by comparing sets of vegetation and climatic variables extracted for each locality. Key Results Three majority (2x, 4x, 6x) and three minority (3x, 5x, 8x) cytotypes were detected in situ, in addition to a heptaploid individual originating from a botanical garden. While single-cytotype populations predominate, 12 mixed-ploidy populations were also found. The overall pattern of ploidy level distribution is quite complex, but some ecological segregation was observed. Hexaploids are the most common cytotype and prevail in the Fynbos biome. In contrast, tetraploids dominate in the Succulent Karoo biome. Precipitation parameters were identified as the most important climatic variables associated with cytotype distribution. Conclusions Although it would be premature to make generalizations regarding the role of genome duplication in the genesis of hyperdiversity of the Cape flora, the substantial and unexpected ploidy diversity in Oxalis obtusa is unparalleled in comparison with any other cytologically known native Cape plant species. The results suggest that ploidy variation in the Greater Cape Floristic Region may be much greater than currently assumed, which, given the documented role of polyploidy in speciation, has direct implications for radiation hypotheses in this biodiversity hotspot.
ACCESSION #
86428425

 

Related Articles

  • Evolution of Duplicate Gene Expression in Polyploid and Hybrid Plants. Adams, Keith L. // Journal of Heredity;Mar/Apr2007, Vol. 98 Issue 2, p136 

    Allopolyploidy is a prominent mode of speciation in flowering plants. On allopolyploidy, genomic changes can take place, including chromosomal rearrangement and changes in gene expression; these processes continue over evolutionary time. Recent studies of gene expression in polyploid and hybrid...

  • Minority cytotypes in European populations of the Gymnadenia conopsea complex (Orchidaceae) greatly increase intraspecific and intrapopulation diversity. Trávníček, Pavel; Jersáková, Jana; Kubátová, Barbora; Krejčíková, Jana; Bateman, Richard M.; Lučanová, Magdalena; Krajníková, Eva; Těšitelová, Tamara; Štípková, Zuzana; Amardeilh, Jean-Pierre; Brzosko, Emilia; Jermakowicz, Edyta; Cabanne, Olivier; Durka, Walter; Efimov, Peter; Hedrén, Mikael; Hermosilla, Carlos E.; Kreutz, Karel; Kull, Tiiu; Tali, Kadri // Annals of Botany;Oct2012, Vol. 110 Issue 5, p977 

    Background and Aims Patterns of ploidy variation among and within populations can provide valuable insights into the evolutionary mechanisms shaping the dynamics of plant systems showing ploidy diversity. Whereas data on majority ploidies are, by definition, often sufficiently extensive, much...

  • Chromosome numbers of the Australian Cymodoceaceae. Kuo, John // Plant Systematics & Evolution;Oct2013, Vol. 299 Issue 8, p1443 

    The somatic chromosome numbers of the eleven Australian seagrass species belonging to five genera in the Family Cymodoceaceae were determined. The chromosome numbers in Amphibolis and Thalassodendron are reported for the first time. Cymodocea and Halodule species have the following chromosome...

  • Karyological data of 47 accessions of 28 Artemisia (Asteraceae, Anthemideae) species from Iran, with first new reports for Iranian populations and first absolute counts in three species. Dolatyari, Alireza; Vallès, Joan; Naghavi, Mohammad; Shahzadeh Fazeli, Seyed // Plant Systematics & Evolution;Oct2013, Vol. 299 Issue 8, p1503 

    Somatic chromosome numbers of 47 accessions representing 28 Artemisia species are provided from Iran. Two basic chromosome numbers, x = 8, 9, each with diploid, tetraploid and hexaploid levels, were found. Different chromosome numbers, 2 n = 16, 16 + 1B, 16 + 5B, 32, 48, and 2 n = 18, 18 + 1B,...

  • Genome size variation in Begonia. Dewitte, Angelo; Leus, Leen; Eeckhaut, Tom; Vanstechelman, Ives; Huylenbroeck, Johan Van; Bockstaele, Erik Van // Genome;Oct2009, Vol. 52 Issue 10, p829 

    The genome sizes of a Begonia collection comprising 37 species and 23 hybrids of African, Asiatic, Middle American, and South American origin were screened using flow cytometry. Within the collection, 1C values varied between 0.23 and 1.46 pg DNA. Genome sizes were, in most cases, not positively...

  • Maternal donors of polyploids in Pseudoroegneria (Poaceae: Triticeae) and related genera inferred from chloroplast trnL-F sequences.  // Turkish Journal of Biology;2010, Vol. 34 Issue 4, p335 

    No abstract available.

  • Compact genomes and complex evolution in the genus Brachypodium. Wolny, Elzbieta; Lesniewska, Karolina; Hasterok, Robert; Langdon, Tim // Chromosoma;Apr2011, Vol. 120 Issue 2, p199 

    The temperate annual grass Brachypodium distachyon is a diploid species with a chromosome base number of 5. It is strikingly different from other Eurasian species of the genus, which are perennial and often polyploid, with the diploids typically having base numbers of 8 or 9. Previously,...

  • Genomic in situ hybridization reveals both auto- and allopolyploid origins of different North and Central American hexaploid potato ( Solanum sect. Petota) species. Pendinen, Galina; Spooner, David M.; Jiang, Jiming; Gavrilenko, Tatjana; Puertas, M. // Genome;Jun2012, Vol. 55 Issue 6, p407 

    Wild potato ( Solanum L. sect. Petota Dumort.) species contain diploids (2 n = 2 x = 24) to hexaploids (2 n = 6 x = 72). J.G. Hawkes classified all hexaploid Mexican species in series Demissa Bukasov and, according to a classic five-genome hypothesis of M. Matsubayashi in 1991, all members of...

  • Uneven HAK/KUP/KT Protein Diversity Among Angiosperms: Species Distribution and Perspectives. Nieves-Cordones, Manuel; Ródenas, Reyes; Chavanieu, Alain; Rivero, Rosa M.; Martinez, Vicente; Gaillard, Isabelle; Rubio, Francisco; Dreyer, Ingo; Ryoung Shin // Frontiers in Plant Science;2/9/16, p1 

    HAK/KUP/KT K+ transporters have been widely associated with K+ transport across membranes in bacteria, fungi, and plants. Indeed some members of the plant HAK/KUP/KT family contribute to root K+ uptake, notably at low external concentrations. Besides such role in acquisition, several studies...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics