Nuclear-cytoplasmic male-sterility in diploid dandelions

Male-sterility was found in diploid dandelions from two widely separated populations from France, and its inheritance was analysed by crossing a diploid male-sterile dandelion to diploid sexuals and triploid apomicts. Nuclear genetic variation, found in full-sib families, segregated for male-fertili...

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Bibliographic Details
Published in:Heredity 2004-07, Vol.93 (1), p.43-50
Main Authors: Hulst, R.G.M. van der, Meirmans, P, Tienderen, P.H. van, Damme, J.M.M. van
Format: Article
Language:English
Subjects:
apomixis
Biomedical and Life Sciences
Biomedicine
Cell Nucleus - physiology
chloroplast DNA
Chloroplasts - genetics
Crosses, Genetic
Cytogenetics
Cytoplasm - physiology
cytoplasmic male sterility
Diploidy
Ecology
Evolutionary Biology
Fertility
gene segregation
Genetic diversity
Genetic Variation
Haplotypes
Human Genetics
Male sterility
nucleocytoplasmic interaction
original-article
Phenotype
plant fertility
Plant Genetics and Genomics
Pollen
Pollen - genetics
Population structure
Taraxacum
Taraxacum - genetics
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Summary:Male-sterility was found in diploid dandelions from two widely separated populations from France, and its inheritance was analysed by crossing a diploid male-sterile dandelion to diploid sexuals and triploid apomicts. Nuclear genetic variation, found in full-sib families, segregated for male-fertility, partial male-sterility, and full male-sterility, and also segregated for small-sized versus normally sized pollen. The crossing results are best explained by a cytoplasmic male-sterility factor in combination with two dominant restorer genes. Involvement of the cytoplasmic male-sterility factor was further investigated by chloroplast haplotyping. Male-sterility was exclusively associated with a rare chloroplast haplotype (designated 16b). This haplotype was found in seven male-sterile plants and one (apparently restored) male-fertile individual but does not occur in 110 co-existing male-fertile plants and not in several hundreds of individuals previously haplotyped. Apomicts with cytoplasmic male sterility were generated in some test crosses. This raises the question as to whether the male sterility found in natural dandelion apomicts, is of cytoplasmic or of nuclear genetic nature. As many breeding systems in Taraxacum are involved in shaping population structure, it will be difficult to predict the evolutionary consequences of nuclear-cytoplasmic male-sterility for this species complex.
ISSN:0018-067X
1365-2540
DOI:10.1038/sj.hdy.6800478