Abstract
Most traits of agronomic importance in rice are quantitative in nature and are controlled by polygenes, called quantitative trait loci (QTL). Understanding the nature and effect of QTLs are important for rice breeding to achieve higher yield and stability. Single segment substitution lines (SSSLs or 3-S Lines) were developed through simple sequence repeats (SSR) marker-facilitated backcrossing methods for Hua-Jing-Xian 74 (HJX74) with the donor segment from six elite germplasm and was characterized. Complete genome survey was carried out with 258 polymorphic SSR markers. Polymorphism of the donors with the recurrent parent varied between 32.98 and 60.73% with an average of 47.81%. Japonica donors were more polymorphic than indica donors. Number of substitution segments per plant decreased with the advancement of backcross generations. In BC2F1, BC3F1, BC3F2 and BC3F3 the average number of substitution segment per plant were 12.5, 5.98, 1.69 and 1.46, respectively. Average size of substitution segments also decreased with the number of times plants were backcrossed and selfed. In BC2F1, BC3F1, BC3F2 and BC3F3, average size of the segments was 25.43, 22.38, 20.78 and 18.15 cM, respectively. The rate of reduction of segment size was more in backcross (11.99%) than selfing (7.15%) generations. Percent recovery of recurrent parent genome in BC2F1, BC3F1, BC3F2 and BC3F3 was 82.24, 92.55, 98.04 and 98.52%, respectively. A total of 111 SSSLs comprising of 43 unique types were developed in BC3F2 and BC3F3. The estimated length of the segments in SSSLs ranged from 2.00 to 64.80 cM with an average of 21.75 cM, and 6.05 to 48.90 cM with an average of 20.95 cM in BC3F2 and BC3F3, respectively. Total length of all substitution segments was 2367.5 cM that covered 704.50 cM (39.25%) of the entire rice genome. Effective development and successful utilization of 3-S Lines for analysis of QTLs and mapping of genes established the suitability of the SSR marker facilitated backcross breeding approach for 3-S Lines development and its utilization.
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Talukdar, A., Zhang, G. Construction and characterization of 3-S Lines, an alternative population for mapping studies in rice (Oryza sativa L.). Euphytica 156, 237–246 (2007). https://doi.org/10.1007/s10681-007-9370-1
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DOI: https://doi.org/10.1007/s10681-007-9370-1