Summary
Diallel cross hybrids obtained by crossing six opaque-2 (o 2) converted inbred lines were compared with a similar series of crosses made between the analogous normal inbred lines together with the parents, for a number of protein quality and oil traits. The results obtained show that there is only a minor decrease in percent protein or yield of protein per hectare caused by the presence of the o 2 gene in recessive homozygous condition, compared with its normal counterpart. On the other hand, percent lysine in the whole kernel, lysine yield per hectare and percent lysine in protein are increased by 53, 45 and 55 percent, respectively, in the o 2 inbred lines and hybrids compared with their normal analogues. Percent oil and oil yield remain almost unaltered by the presence or absence of the o 2 gene. As well as lysine, the content of other amino acids, such as aspartic acid, arginine, glycine, threonine, valine and histidine are also, in general, increased by the presence of the o 2 gene in recessive homozygous condition.
The results obtained have shown that a number of correlation coefficients between the protein quality traits and yield components related to kernel characteristics are negative and significant, especially in the presence of the o 2 gene in recessive homozygous condition. Only two correlation coefficients have been found that could be used with advantage by opaque-2 maize breeders. They are a stronger positive correlation of percent protein with percent lysine, and lysine yield per hectare with 1000 grain weight, in o 2 maize than in normal maize.
The results presented here also show that there is more heterotic dilution in the o 2 hybrids than in the normal analogues for traits like percent protein, percent lysine (whole kernel basis) and percent lysine in protein. It has been observed that the inbred lines with the o 2 gene in recessive homozygous condition and a superior protein quality tend to produce hybrids of superior quality.
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Literature
AACC: Cereal laboratory methods. St. Paul, Minnesota: American Association of Cereal Chemists, Inc. 1962.
Dudley, J. W., Lambert, R. J., Alexander, D. E.: Variability and relationships among characters in Zea mays L. synthetics with improved protein quality. Crop Sci. 11, 512–514 (1971).
Frey, K. J.: The interrelationships of protein and amino acids in corn. Cereal Chem. 28, 123–132 (1951).
Gupta, D., Kovács, I.: Inter-character relationships and heterosis observed in opaque-2 maize crosses and in their normal analogues. Theoret. Appl. Genetics 45, 64–71 (1974a).
Gupta, D., Kovács, I.: A physiological study of opaque-2 maize and its normal analogue. Proceedings of the VII meeting of the maize and sorghum section of Eucarpia joint physiology section, Stubicke Toplice, Yugoslavia, September 3–6, 1973 (1974b, in press).
Gupta, D., Kovács, I.: Kernel characteristics of opaque-2 maize and its normal analogue, ibid. (1974c, in press).
Hayes, H. K.: Production of high protein maize by Mendelian methods. Genetics 7, 237–257 (1922).
Mertz, E. T., Bates, L. S., Nelson, O. E.: Mutant gene that changes protein composition and increases lysine content of maize endosperm. Science 145, 279–280 (1964).
Moore, S., Stein, W. H.: Procedures for the chromatographic determination of amino acids on four percent cross linked sulfonated polystyrene resins. J. Biol. Chem. 211, 893–906 (1954).
MSz: Takarmányok táplálóértékének megállapitása:Kémiai vizsgálatok és számitások (Feed nutrient value determination: Chemical test methods and calculations). MSz 6830-66 Budapest: Magyar Szabványügyi Hivatal (Office of the Hungarian Bureau of Standards) 1972.
Osborne, T. B.: The amount and properties of the proteins of the maize kernels. J. Amer. Chem. Soc. 19, 525–532 (1897).
Osborne, T. B.: Amino acids in nutrition and growth. J. Biol. Chem. 18, 325–349 (1914).
Osborne, T. B., Mendel, L. B.: Nutrition properties of the maize kernel. J. Biol. Chem. 18, 1–16 (1914).
Paez, A. V., Zuber, M. S.: Protein quality study with the endosperm corn mutant genes opaque-2 and floury-2. Can. J. Plant Sci. 53, 715–720 (1973).
Snedecor, G. W.: Statistical methods. Ames, Iowa: Iowa State College Press 1956.
Sreeramulu, C., Bauman, L. F.: Yield components and protein quality of opaque-2 and normal diallels of maize. Crop Sci. 10, 262–265 (1970).
Weidner, K., Eggum, B. O.: Protein hydrolysis: A description of the method used at the Department of Animal Physiology in Copenhagen. Acta Agriculturae Scandinavica 16, 115–119 (1966).
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Communicated by L. Alföldi
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Gupta, D., Kovács, I. & Gáspár, L. Protein quality traits and their relationships with yield and yield components of opaque-2 and analogous normal maize hybrids and inbred lines. Theoret. Appl. Genetics 45, 341–348 (1974). https://doi.org/10.1007/BF00277674
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DOI: https://doi.org/10.1007/BF00277674