期刊
EVOLUTION
卷 65, 期 10, 页码 2959-2972出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1558-5646.2011.01361.x
关键词
Asymmetric postmating isolation; CMS; hybrid incompatibility; postzygotic reproductive isolation; speciation
资金
- Academy of Finland's Research Council for Biosciences and Environment [107167, 120809]
- Finnish Population Genetics Graduate School
- Biocenter Oulu
- Academy of Finland (AKA) [107167, 120809, 120809, 107167] Funding Source: Academy of Finland (AKA)
We examined the level of postzygotic reproductive isolation in F(1) and F(2) hybrids of reciprocal crosses between the Arabidopsis lyrata subspecies lyrata (North American) and petraea (European). Our main results are: first, the percentage of fertile pollen was significantly reduced in the F(1) and F(2) compared to the parental populations. Second, mean pollen fertility differed markedly between reciprocal crosses: 84% in the F(2) with ssp. lyrata cytoplasm and 61% in the F(2) with ssp. petraea cytoplasm. Third, 17% of the F(2) with ssp. petraea cytoplasm showed male sterility (produced less than 30 pollen grains in our subsample). The hybrids were female fertile. We used QTL mapping to find the genomic regions that determine pollen fertility and that restore cytoplasmic male sterility (CMS). In the F(2) with ssp. lyrata cytoplasm, an epistatic pair of QTLs was detected. In the reciprocal F(2) progeny, four QTLs demonstrated within-population polymorphism for hybrid male sterility. In addition, in the F(2) with ssp. petraea cytoplasm, there was a strong male fertility restorer locus on chromosome 2 where a cluster of CMS restorer gene-related PPR genes have been found in A. lyrata. Our results underline the importance of cytonuclear interactions in understanding genetics of the early stages of speciation.
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