Summary
To obtain genetic materials to breed qualitatively improved rice storage proteins, we screened about 3,000 mutant lines induced by the treatment of rice fertilized egg cell with N-methyl-N-nitrosourea (MNU). The screening was performed by comparing the profiles of sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) with that of the original variety, Kinmaze, especially focussing on the changes in polypeptides present in two kinds of protein bodies, PB-I and PB-II. We selected 17 mutant lines and classified them into 4 types on the basis of variations of the relative contents of the polypeptides. Determination of extracted protein in the starchy endosperm of the mutants revealed changes in the content of prolamin and glutelin but not globulin. In some mutants there was marked accumulation of 57 kDa polypeptide concomitant with the remarkable reduction of glutelin subunits. Treatment of the fertilized egg cell with MNU was found to be an effective method to induce mutations for storage proteins in protein bodies of rice.
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Communicated by F. Salamini
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Kumamaru, T., Satoh, H., Iwata, N. et al. Mutants for rice storage proteins. Theoret. Appl. Genetics 76, 11–16 (1988). https://doi.org/10.1007/BF00288825
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DOI: https://doi.org/10.1007/BF00288825