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Geno A Linkage Map Reveals a Complex Basis for Segregation Distortion in an Interpopulation Cross in the Moss Ceratodon purpureus
研磨苔蘚提取dna - Biology Department, Duke University 杜克大学生物系


ABSTRACT
We report the construction of a linkage map for the moss Ceratodon purpureus (n ¼ 13), based on a cross
between geographically distant populations, and provide the first experimental confirmation of maternal
chloroplast inheritance in bryophytes. From a mapping population of 288 recombinant haploid
gametophytes, genotyped at 121 polymorphic AFLP loci, three gene-based nuclear loci, one chloroplast
marker, and sex, we resolved 15 linkage groups resulting in a map length of 730 cM. We estimate that the
map covers more than three-quarters of the C. purpureus genome. Approximately 35% of the loci were sex
linked, not including those in recombining pseudoautosomal regions. Nearly 45% of the loci exhibited
significant segregation distortion (a ¼ 0.05). Several pairs of unlinked distorted loci showed significant
deviations from multiplicative genotypic frequencies, suggesting that distortion arises from genetic
interactions among loci. The distorted autosomal loci all exhibited an excess of the maternal allele,
suggesting that these interactions may involve nuclearcytoplasmic factors. The sex ratio of the progeny was
significantly male biased, and the pattern of nonrandom associations among loci indicates that this results
from interactions between the sex chromosomes. These results suggest that even in interpopulation crosses,
multiple mechanisms act to influence segregation ratios. SPEXGENO 2010 高通量组织研磨机
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