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Evolution of apomixis loci in Pilosella and Hieracium (Asteraceae) inferred from the conservation of apomixis-linked markers in natural and experimental populations
ML. Hand, P. Vít, A. Krahulcová, SD. Johnson, K. Oelkers, H. Siddons, J. Chrtek, J. Fehrer, AM. Koltunow,
Language English Country England, Great Britain
Document type Journal Article, Research Support, Non-U.S. Gov't
NLK
Free Medical Journals
from 2011
PubMed Central
from 2011 to 1 year ago
Europe PubMed Central
from 2011 to 1 year ago
ProQuest Central
from 2000-01-01 to 1 year ago
Open Access Digital Library
from 1947-01-01
Medline Complete (EBSCOhost)
from 1996-01-01 to 2015-12-31
Health & Medicine (ProQuest)
from 2000-01-01 to 1 year ago
Public Health Database (ProQuest)
from 2000-01-01 to 1 year ago
PubMed
25026970
DOI
10.1038/hdy.2014.61
Knihovny.cz E-resources
- MeSH
- Apomixis genetics MeSH
- Asteraceae genetics MeSH
- Biological Evolution * MeSH
- DNA, Chloroplast genetics MeSH
- DNA, Plant genetics MeSH
- Genetic Loci * MeSH
- Genetic Markers MeSH
- Haplotypes MeSH
- Conserved Sequence MeSH
- Molecular Sequence Data MeSH
- Genetics, Population MeSH
- Gene Expression Regulation, Plant MeSH
- Genes, Plant * MeSH
- Seeds genetics MeSH
- Inheritance Patterns MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
The Hieracium and Pilosella (Lactuceae, Asteraceae) genera of closely related hawkweeds contain species with two different modes of gametophytic apomixis (asexual seed formation). Both genera contain polyploid species, and in wild populations, sexual and apomictic species co-exist. Apomixis is known to co-exist with sexuality in apomictic Pilosella individuals, however, apomictic Hieracium have been regarded as obligate apomicts. Here, a developmental analysis of apomixis within 16 Hieracium species revealed meiosis and megaspore tetrad formation in 1 to 7% of ovules, for the first time indicating residual sexuality in this genus. Molecular markers linked to the two independent, dominant loci LOSS OF APOMEIOSIS (LOA) and LOSS OF PARTHENOGENESIS (LOP) controlling apomixis in Pilosella piloselloides subsp. praealta were screened across 20 phenotyped Hieracium individuals from natural populations, and 65 phenotyped Pilosella individuals from natural and experimental cross populations, to examine their conservation, inheritance and association with reproductive modes. All of the tested LOA and LOP-linked markers were absent in the 20 Hieracium samples irrespective of their reproductive mode. Within Pilosella, LOA and LOP-linked markers were essentially absent within the sexual plants, although they were not conserved in all apomictic individuals. Both loci appeared to be inherited independently, and evidence for additional genetic factors influencing quantitative expression of LOA and LOP was obtained. Collectively, these data suggest independent evolution of apomixis in Hieracium and Pilosella and are discussed with respect to current knowledge of the evolution of apomixis.
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