Abstract
To produce stable mutants from Mankeumbyeo, a japonica rice (Oryza sativa L.) variety, we estimated the mutation efficiency of ethyl methane sulfonate (EMS) and N-methyl-N-nitrosourea (MNU) on fertilized egg cells using doubled haploids (DHs) derived from anther culture of M1 plants. M1 seed production and germination were higher in 1 mM MNU than in 94.2 mM EMS. A total of 68 DHs (35.4%) were regenerated by anther culture of M1 plants. Twenty-one DHs (30.9%) were stable mutants, 14 DHs (20.6%) were unstable mutants, and the remainder (48.5%) were normal. The frequencies of stable mutants following EMS and MNU treatments were 20.7% (three semidwarfs, one early maturation and one glabrous line) and 38.5% (three semidwarfs, two early maturation, four glabrous and one long grain line), respectively. In a field trial of seven stable mutants for yield potential, five mutants did not show a significant difference in yield as compared with the original variety. Among these five, three glabrous mutants (MK-MAC 1, MK-MAC 4 and MK-MAC 26) with a smooth leaf and hull may be considered to be improved mutant lines because of the health benefits (reduced skin damage and generation of less dust compared to the original variety) to farmers handling the plant materials. MK-MAC 26, a glabrous mutant, had also less shattering resistance than that of the original variety. These stable mutants could be used as new breeding materials.
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This work was supported by Wonkwang University in 2001.
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Communicated by P.P. Kumar
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Lee, S.Y., Cheong, J.I. & Kim, T.S. Production of doubled haploids through anther culture of M1 rice plants derived from mutagenized fertilized egg cells. Plant Cell Rep 22, 218–223 (2003). https://doi.org/10.1007/s00299-003-0663-0
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DOI: https://doi.org/10.1007/s00299-003-0663-0