Relação entre peso relativo de sementes e teores de proteína e lisina no milho opaco-2
Palavras-chave:
gene opaco-2, qualidade milho, aminoácidos essenciais, peso relativo, composição químicaResumo
A study was made of the Fp generation of diallel crosses between different classes of relative weight of seeds of the corn variety 'Maya 50'. The influence of these various weights were analyzed using the Fj of the crosses and their reciprocals. Characteristics studied were percent protein and percent lysine in both the endosperm and the germ, and the ratio of lysine to protein in the endosperm.
In nome of the above characteristics was any important difference found between crosses and their reciprocals.
A negative association was observed between relative weight of seed of opaque-2 and its percent of protein, as well as lysine in the endosperm. There was a tendency for seed of greater relative weight to have a lower level of protein and lysine in the endosperm. These data suggest a possible problem in selecting opaque corn of greater relative weight.
No relationship was found between relative weight of opaque seed and protein or lysine level in the germ.
The opaque seeds had lower levels of protein in the endosperm and higher levels of protein in the germ than normal seeds on the same ears.
The opaque seeds had in their endosperms 81% more lysine in the protein than did normal seeds.
In the endosperm of the opaque seeds the lysine as percent of protein was always greater than that of normal endosperm indicating a superior quality of protein in the endosperm of opaque-2 seed.
Referências
ALVEY, D.D. & HAMILTON,J.R. Effect of genetic background on the lysine content of corn endosperm homosygous' for opaque-2 gene. Agronomy Abstracts, USA, p.3. 1966.
BEESON, W.M., PICKETT, R.A., MERTZ, E.T., CROMWELL, G.L, & NELSON, O0.E. Nutritional value of high-lysine corn. Lafayette, USA, Purdue University, 1966. 8 p. (Research Progress Report 227).
FEIST, W.A. & PATTERSON, E.B. Evaluation of six inbred lines of Zea mays during conversion to opaque. Agronomy Abstracts, USA, p. 7. 1968.
LENG, E.R., EARLE, F.R. & CURTIS, J.J. Direct effect of pollen parent on protein content of the corn kernel. Cereal Chemistry, USA, 28(6):479-482. 1951.
MERTZ, E.T., BATES, L.S. & NELSON, 0.E. Mutant gene that changes protein composition and increases lysine content of mayze endosperm. Science, USA, 145 (3629): 279-280.
NELSON, 0.E. Opaque-2, floury-2 and high protein maize. In: Proceedings of the High Lysine Corn Conference. Washington, USA, Corn Refiners Association, Inc., 1966. p. 156- 160.
NELSON, O.E. O programa de milho opaco-2 na Universidade de Purdue. In: Anais da VII Reunião Brasileira do Milho e I Simpósio sobre o Milho Opaco, Viçosa, Universidade Federal, 1971. p. 160-183.
NEUFFER, M.G., JONES, L. & ZUBER, M.S. The mutants of maize. Wisconsin, Crop Science Society of America, 1968. 74p.
PAEZ, A.V., USSARY, J.P., HELM, J.L. & ZUBER, M.S. Survey of maize strains for lysine content. Agronomy Journal, USA, 61(6): 886-889. 1969.
WICHSER, W.R. Comparison of the dry milling properties of opaque-2 and normal dent corn. In: Proceedings of the High Lysine Corn Conference. Washington, USA, Corn Refiners Asociation, Inc., 1966. p. 104-116.
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