High-throughput development of SSR marker candidates and their chromosomal assignment in rye (Secale cereale L.)

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Abstract

Shotgun survey sequences of flow-sorted individual rye chromosomes were data mined for the presence of simple sequence repeats (SSRs). For 787,850 putative SSR loci, a total of 358,660 PCR primer pairs could be designed and 51,138 nonredundant SSR marker candidates were evaluated by in silico PCR. Of the 51,138 SSR primer candidates, 1,277 were associated with 1,125 rye gene models. A total of 2,112 of the potential SSR markers were randomly selected to represent about equal numbers for each of the rye chromosomes, and 856 SSRs were assigned to individual rye chromosomes experimentally. Potential transferability of rye SSRs to wheat and barley was of low efficiency with 4.3% (2,189) and 0.4% (223) of rye SSRs predicted to be amplified in wheat and barley, respectively. This data set of rye chromosome-specific SSR markers will be useful for the specific detection of rye chromatin introgressed into wheat as well as for low-cost genetic and physical mapping in rye without the need for high-tech equipment.

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Li, J., Zhou, R., Endo, T. R., & Stein, N. (2018). High-throughput development of SSR marker candidates and their chromosomal assignment in rye (Secale cereale L.). Plant Breeding, 137(4), 561–572. https://doi.org/10.1111/pbr.12619

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