Abstract
With 2 tables Abstract Recombination frequency greatly affects selection efficiency in plant breeding. A high‐density single‐nucleotide polymorphism (SNP) map integrated with physical map and other molecular maps is very useful for characterizing genetic recombination variation. In this study, recombination frequency in maize was investigated through SNP linkage maps constructed with three recombinant inbred line populations. The integrated map consisted of 1443 molecular markers, including 1155 SNPs, spanning 1346 cM. A 100‐fold difference in recombination frequency was observed between different chromosomal regions, ranging from an average of 0.09 cM/Mb for pericentromeric regions to 7.08 cM/Mb for telomeric regions. Recombination suppression in non‐centromeric regions identified nine recombination‐suppressed regions, one of which likely contained condensed heterochromatin (knobs). Recombination variation along chromosomes was highly predictable for pericentromeric and telomeric regions, but population‐specific with 4.5‐fold difference for the same marker interval across the three populations or specific chromosome regions because of the presence of knobs. As recombination variation can be identified and well characterized as shown in this study, the related information will facilitate future genetic studies, gene cloning and marker‐assisted plant breeding.
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Claims 6
Claim · model-written summary
The integrated maize map had 1443 markers, including 1155 SNPs, across 1346 cM.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“The integrated map consisted of 1443 molecular markers, including 1155 SNPs, spanning 1346 cM.”
Claim · model-written summary
Recombination frequency varied 100-fold across chromosome regions.
- Outcome
- recombination frequencye0
- Direction
- differencee0
- Value
- 100‐folde0
- Qualifier
- 0.09 cM/Mb for pericentromeric regions to 7.08 cM/Mb for telomeric regionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“A 100‐fold difference in recombination frequency was observed between different chromosomal regions, ranging from an average of 0.09 cM/Mb for pericentromeric regions to 7.08 cM/Mb for telomeric regions.”
Claim · model-written summary
Nine non-centromeric regions showed suppressed recombination.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“Recombination suppression in non‐centromeric regions identified nine recombination‐suppressed regions, one of which likely contained condensed heterochromatin (knobs).”
Claim · model-written summary
One suppressed region likely contained condensed heterochromatin knobs.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“one of which likely contained condensed heterochromatin (knobs)”
Claim · model-written summary
Recombination variation was highly predictable in pericentromeric and telomeric regions.
- Outcome
- Recombination variatione0
- Direction
- highly predictablee0
- Qualifier
- pericentromeric and telomeric regionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“Recombination variation along chromosomes was highly predictable for pericentromeric and telomeric regions”
Claim · model-written summary
Recombination varied 4.5-fold for the same interval across three populations or knob-containing regions.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“population‐specific with 4.5‐fold difference for the same marker interval across the three populations or specific chromosome regions because of the presence of knobs”