Abstract The development of PCR-based, easily automated
molecular genetic markers, such as SSR markers,
are required for realistic cost-effective marker-assisted
selection schemes. This paper describes the development
and characterization of 172 new SSR markers for the
cassava genome. The placement of 36 of these markers
on the existing RFLP framework map of cassava is also
reported. Two similar enrichment methods were employed.
The first method yielded 35 SSR loci, for which
primers could be designed, out of 148 putative DNA
clones. A total of 137 primer pairs could be designed
from 544 putative clones sequenced for the second enrichment.
Most of the SSRs (95%) were di-nucleotide repeats,
and 21% were compound repeats. A major drawback
of these methods of SSR discovery is the redundancy
– 20% duplication; in addition, primers could not be
designed for many SSR loci that were too close to the
Abstract The development of PCR-based, easily automated
molecular genetic markers, such as SSR markers,
are required for realistic cost-effective marker-assisted
selection schemes. This paper describes the development
and characterization of 172 new SSR markers for the
cassava genome. The placement of 36 of these markers
on the existing RFLP framework map of cassava is also
reported. Two similar enrichment methods were employed.
The first method yielded 35 SSR loci, for which
primers could be designed, out of 148 putative DNA
clones. A total of 137 primer pairs could be designed
from 544 putative clones sequenced for the second enrichment.
Most of the SSRs (95%) were di-nucleotide repeats,
and 21% were compound repeats. A major drawback
of these methods of SSR discovery is the redundancy
– 20% duplication; in addition, primers could not be
designed for many SSR loci that were too close to the
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