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Genetics. Aug 1993; 134(4): 1249–1260.
PMCID: PMC1205592

A Genetic Linkage Map of Saccharum Spontaneum L. `ses 208'

Abstract

The arbitrarily primed polymerase chain reaction was used to detect single-dose polymorphisms that, in turn, were used to generate a linkage map of a polyploid relative of cultivated sugarcane, Saccharum spontaneum `SES 208' (2n = 64). The mapping population was composed of 88 progeny from a cross between SES 208 and a diploidized haploid derived from SES 208 by anther culture, ADP 85-0068. This cross allowed direct analysis of meiosis in SES 208 and gametic segregation ratios to be observed. One hundred twenty-seven 10-mer oligonucleotide primers of arbitrary sequence were selected from a pool of 420 primers used to screen the mapping parents. Three hundred thirty-six of the 420 primers amplified 4,540 loci or 13.5 loci per primer. The selected 127 primers revealed 2,160 loci of which 279 were present in SES 208 and absent in ADP 85-0068 and easily scored. Two hundred and eight (74.6%) of these 279 polymorphisms were single-dose polymorphisms (i.e., they displayed 1:1 segregation, χ(2) at 98% confidence level). Linkage analysis (θ = 0.25, LOD = 9.0 for two-point analysis, then θ = 0.25, LOD = 6.0 for multipoint analysis) of single-dose polymorphisms placed them into 42 linkage groups containing at least 2 markers. These single-dose markers span 1,500 contiguous centimorgans (cM) with 32 markers remaining unlinked (15.4%). From this 208-marker map we estimated the genome size of SES 208 to be 2,550 cM. The map has a predicted coverage of 85.1% at 30 cM, meaning that any new marker placed has an 85.1% chance of being within 30 cM of an existing marker. Furthermore, we show that SES 208 behaves like an autopolyploid because (i) the ratio of single-dose markers to higher dose markers fit the assumption of autooctaploidy and (ii) the absence of repulsion phase linkages. This is the first genetic map constructed directly on a polyploid species for which no diploid relatives are known.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
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