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A TILLING Rice Population Induced by Gamma-ray Irradiation and its Genetic Diversity  

Cho, Hyun Yong (Plant Genomics Lab, Dept of Applied Plant Sciences, Kangwon Natl University)
Park, Seo Jung (Plant Genomics Lab, Dept of Applied Plant Sciences, Kangwon Natl University)
Kim, Dong Sub (Advaned Radiation Technology Institute, Korea Atomic Energy Research Institute)
Jang, Cheol Seong (Plant Genomics Lab, Dept of Applied Plant Sciences, Kangwon Natl University)
Publication Information
Korean Journal of Breeding Science / v.42, no.4, 2010 , pp. 365-373 More about this Journal
Abstract
TILLING (Targeting Induced Local Lesions IN Genomes) is broadly regarded as an excellent methodology for reverse genetics applications. Approximately 15,000 $M_3$ TILLING lines have been developed via the application of gamma-ray irradiation to rice seeds (cv. Donganbyeo), followed by subsequent selections. In an effort to evaluate the genetic diversity of the TILLING population, we have employed the AFLP multiple dominant marker technique. A total of 96 (0.64%) TILLING lines as well as Donganbyeo were selected randomly and their genetic diversity was assessed based on AFLP marker polymorphisms using 5 primer combinations. An average of 100.4 loci in a range of 97 to 106 was detected using these primer combinations, yielding a total of 158 (31.4%) polymorphic loci between Donganbyeo and each of the 96 lines. A broad range of similarity from 80% to 96% with an average of 89.4% between Donganbyeo and each of the 96 lines was also observed, reflecting the genetic diversity of the TILLING population. Approximately 28 polymorphic loci have been cloned and their sequences were BLAST-searched against rice whole genome sequences, resulting in 20 matches to each of the gene bodies including exon, intron, 1 kb upstream and 1 kb downstream regions. Six polymorphic loci evidenced changes in the coding regions of genes as compared to the rice pseudomolecules, 4 loci of which exhibited missense mutations and 2 loci of which exhibited silent mutations. Therefore, the results of our study show that the TILLING rice population should prove to be a useful genetic material pool for functional genomics as well as mutation breeding applications.
Keywords
Functional genomics; Gamma ray irradiation; Genetic diversity; Rice; TILLING;
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