Abstract
Rapid and uniform seed germination under diverse environmental conditions is a desirable characteristic for most crop plants, such as rice, wheat, and maize. However, the genetic base of the variations in the rate of germination is not well understood. In this study, quantitative trait loci (QTL) for germination rate were mapped with a set of 143 chromosome segment substitution lines (CSSL) each contains a small genomic fragment from a japonica variety Nipponbare in the uniform genetic background of an indica variety Zhenshan97. Nine CSSL showed significantly lower germination rate than that in Zhenshan97. Four germination-related QTL were identified located on chromosomes 2, 5, 6 and 10, at which all japonica alleles decreased germination rate. By using the CSSL-derived F2 population, a major QTL (qGR2) on chromosome 2 was confirmed, and delimited to a 10.4 kb interval containing three putative candidate genes, of which OsMADS29 was only expressed preferentially in the seed. These results would facilitate cloning of the major gene that affects germination rate, and provide an insight into the genetic basis of germination.
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This work was supported in part by grants from National Program on Key Basic Research Project, National Special Program for Research of Transgenic Plant of China, and the National Natural Science Foundation of China (30971750).
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Communicated by E. Guiderdoni.
M. Li and P. Sun contributed equally to the work.
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122_2011_1593_MOESM1_ESM.pdf
Fig. S1 Time course of germination of seeds incubated at 13°C (A), 18°C (B), 23°C (C) and 28°C (D) in three parental lines. Squares, triangles and circles represent the means of three replicates for ‘ZS97’, ‘CSSL29’ and ‘Nipponbare’ respectively, and vertical bars indicate standard deviation. (PDF 22 kb)
122_2011_1593_MOESM2_ESM.pdf
Fig. S2 Germination (%) of CSSLs containing different substitution fragments overlapping the genomic region of RM485–RM1211 on chromosome 2. The phenotype (means ± SD) and P value of Dunnett’s test against ‘ZS97’ are given for each line. ** Indicates significant difference at p < 0.01. (PDF 28 kb)
122_2011_1593_MOESM3_ESM.pdf
Fig. S3 Relative expression in microarray data of LOC_Os02g07420 and LOC_Os02g07430 at different developmental stages in ‘ZS97’. 1–14, the tissue samples collected and the methods for microarray analysis as described by Wang et al. (2010). (PDF 17 kb)
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Li, M., Sun, P., Zhou, H. et al. Identification of quantitative trait loci associated with germination using chromosome segment substitution lines of rice (Oryza sativa L.). Theor Appl Genet 123, 411–420 (2011). https://doi.org/10.1007/s00122-011-1593-9
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DOI: https://doi.org/10.1007/s00122-011-1593-9