Teores de açúcares e polissacarídeos solúveis em água em mutantes e combinações de mutantes que afetam o endosperma do milho
Palabras clave:
açúcares redutores, polissacarídeos solúveis, endosperma do milho, mutantes do milho, sacarose e PSAResumen
The effects of the genes ae, bt1, bta, bta, du, fi1, f, h, 03, shi, su1, sug and wr, and their double-mutant combinations with 02 and fI3 on the accumulation of reducing sugars, sucrose and water-soluble polysaccharides (WSP) in the endosperm of maize were investigated. With the exception of fIj and h, all single mutants accumulated more reducing sugars and sucrose than normal. Opaque-2 tended to increase reducing sugars and sucrose when combined with the other genes. Exceptions were the genotypes aeog and wzog, which decreased reducing sugars. and bt402, which reduced sucrose content, The gene fI3 interacted with the other genes (except 02 and su1) causing drastic increases 1n reducing sugars and sucrose.
Citas
ANDREW, R.H., R.A. BRINK & N.P. NEAL. Some effects of the waxy and sugary genes on endosperm development in maize. J. Agr. Res. 69:355-371. 1944.
AYERS, J.E. & R.G. CREECH. Genetic control of phytoglycogen accumula- tion in maize (Zea mays L.). Crop Sci. 6:739-741. 1969.
BARBOSA, H.M. & D.V. GLOVER. Genes and gene interactions affecting pro- tein and lysine content in the endosperm of maize. (Submetido para publicação).
BARBOSA, H.M. & D.V. GLOVER. Protein and lysine content in double mu- tant endosperm of maize involving the floury-2 gene. (Em preparo).
CAMERON, J.W. Chemico-genetic basic for the reserve carbohydrates in maize endosperm. Genetics 32:459-485. 1947.
CAMERON, J.W. & D.A. COLE, JR. Effects of the genes suj, su2, and du on carbohydrates in developing maize kernels. Agron. J. 51:424-427. 1959.
CAMERON, J.W. & H.J. TEAS. Carbohydrate relationships in developing and mature endosperms of brittle and related maize genotypes. Am. J. Botany 41: 50-55. 1954.
CREECH, R.G. Genetic control of carbohydrate synthesis in maize endosperm. Genetics 52:1175-1186. 1965.
CULPEPPER, C.W. & C.A. MAGOON. Studies upon the relative merits of sweet com varieties for canning purposes and the relation of maturity of corn to the quality of the canned product. J. Agr. Res. 28:403-443. 1924.
CULPEPPER, C.W. & C.A. MAGOON. A study of the factors determining qual- ity in sweet corn. J. Agr. Res. 34:413-433. 1927,
DUNN, G.M,, HH. KRAMER & R.L. WHISTLER. Gene dosage effects on corn endosperm carbohydrates. Agron. J. 45:101-104. 1953.
DVONCH, W., HH. KRAMER & R.L. WHISTLER. Polysaccharides of high amylose corn. Cereal Chem. 28:270-280. 1951.
HODGE, J.E. & B.T. HOFREITER. Determination of reducing sugars and car. bohydrates. In Methods in carbohydrate chemistry (R.L. WHISTLER & M.L. WOLFROM, Eds.). New York, N.Y., Acad. Press, Inc., 1962. Vol. I, p. 380-394.
MERTZ, E.T., L.S. BATES & O.E. NELSON. Mutant gene that changes pro- tein composition and increases lysine content of maize endosperm. Science 145:279-280. 1964.
NELSON, O.E, ET. MERTZ & L.S. BATES. Second mutant gene affecting the amino acid pattern of maize endosperm proteins. Science 150:1469-1470. 1965.
SHANNON, J.C. A procedure for the extraction and fractionation of carbohydrates from immature Zea mays kernels. Purdue Univ., 1968. 8 p. (AES Res. Bul. 842).
TEAS, H.J. & A.N. TEAS. Heritable characters in maize. Description and linkage of brittle endosperm-2. J. Hered. 44:156-158. 1953.
VINEYARD, M.L. & R.P. BEAR. Amylose content. Maize Genetic Coop. News Letter 26:5. 1952.
WATSON. S.A. & K.R. YAHL. Comparison of the wet-milling properties of opaque-2 high Iysine corn and normal corn. Cereal Chem. 44:488-498. 1967.
