Characterization of a New High-lysine Mutant in Barley (Hordeum vulgare L.)
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A chemical, MNU-induced hulless barley mutant line designated as ‘Mutant 98 (M98)’ was developed from a Korean hulless waxy barley cultivar, ‘Chalssalbori’. The objective of the study was to determine the genetic basis of ‘M98’ and the possibility of using ‘M98’ as breeding parent to improve lysine level. Compared to ‘Chalssalbori’, ‘M98’ had large embryo and higher lysine content in both the embryo and endosperm. Significantly different lysine content in ‘M98’ and the other high-lysine barley mutant stocks was observed for two years. However, the genotype by year interaction was not significant. ‘M98’ was higher than the other high-lysine barley mutant stocks in the percentage of lysine of total amino acid composition (0.75%). The trait of shrunken endosperm of ‘M98’, which was typical in the high-lysine mutants, was inherited by a single recessive gene. Based on seed morphology and lysine content of F_1 seeds, ‘M98’ had a genetically different gene from the other high-lysine mutants for shrunken endosperm. Segregation of F_2 for plump/shrunken endosperm did not fit the expected ratio of Mendelian inheritance except for only one cross combination (GSHO1784 (lys1)/M98). The amino acid analysis of F_5 and F_6 progenies from the cross between ‘M98’ and ‘Chalssalbori’ revealed that the attempt to increase the range of lysine content of plump lines did not go beyond the limit of the average high-lysine barley germplasm.
Abstract
A chemical, MNU-induced hulless barley mutant line designated as ‘Mutant 98 (M98)’ was developed from a Korean hulless waxy barley cultivar, ‘Chalssalbori’. The objective of the study was to determine the genetic basis of ‘M98’ and the possibility of using ‘M98’ as breeding parent to improve lysine level. Compared to ‘Chalssalbori’, ‘M98’ had large embryo and higher lysine content in both the embryo and endosperm. Significantly different lysine content in ‘M98’ and the other high-lysine barley mutant stocks was observed for two years. However, the genotype by year interaction was not significant. ‘M98’ was higher than the other high-lysine barley mutant stocks in the percentage of lysine of total amino acid composition (0.75%). The trait of shrunken endosperm of ‘M98’, which was typical in the high-lysine mutants, was inherited by a single recessive gene. Based on seed morphology and lysine content of F_1 seeds, ‘M98’ had a genetically different gene from the other high-lysine mutants for shrunken endosperm. Segregation of F_2 for plump/shrunken endosperm did not fit the expected ratio of Mendelian inheritance except for only one cross combination (GSHO1784 (lys1)/M98). The amino acid analysis of F_5 and F_6 progenies from the cross between ‘M98’ and ‘Chalssalbori’ revealed that the attempt to increase the range of lysine content of plump lines did not go beyond the limit of the average high-lysine barley germplasm.
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