Construction of a high-density SSR marker-based linkage map of zoysiagrass (<Emphasis Type="Italic">Zoysia japonica</Emphasis> Steud.) |
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Authors: | Manli Li Nana Yuyama Mariko Hirata Jianguo Han Yunwen Wang Hongwei Cai |
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Institution: | (1) China Agricultural University, 2 Yuanmingyuan West Road, 100193 Beijing, China;(2) Forage Crop Research Institute, Japan Grassland Agriculture and Forage Seed Association, 388-5, Higashiakata Nasushiobara Tochigi, 329-2742, Japan; |
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Abstract: | A consensus genetic linkage map with 447 SSR markers was constructed for zoysiagrass (Zoysia japonica Steud.), using 86 F1 individuals from the cross ‘Muroran 2’ × ‘Tawarayama Kita 1’. The consensus map identified 22 linkage groups and had a total
length of 2,009.9 cM, with an average map density of 4.8 cM. When compared with a previous AFLP-SSR linkage map, the SSR markers
from each linkage group mapped to similar positions in both maps. Eight pairs of linkage groups from the AFLP-SSR map were
joined into eight new groups in the current map. This zoysiagrass consensus map contained 35 SSR markers exhibiting high homology
with rice genomic sequences from known chromosomal locations. This allowed synteny to be identified between Zoysiagrass linkage
groups 2, 3, 9, 19 and rice chromosomes 3, 12, 2, 7 respectively. These results provide important comparative genomics information
and the new map is now available for quantitative trait locus analysis, marker-assisted selection and breeding for important
traits in zoysiagrass. |
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