01868naa a2200289 a 450000100080000000500110000800800410001910000160006024501000007626000090017652011130018565000220129865000230132065000100134365000140135365000140136765000130138165300130139465300130140765300120142065300120143270000170144470000180146170000190147970000190149877300610151714865612018-06-14       1995    bl uuuu     u00u1 u    #d1 aMORO, G. L.  aPhenotypic effects of opaque-2 modifier genes in normal maize endosperm.h[electronic resource]  c1995  aThe opaque2 modifier genes convert the soft, chalky endosperm, as found in maize opaque2 mutants, to a hard, vitreous phenotype. Modified opaque2 genotypes, also known as Quality Protein Maize (QPM), have increased levels of the essential amino acid Iysine and a normal appearing kernel. The development of vitreous endosperm in QPM is associated with a two-to threefold increase in the l'-zein storage protein. To determine whether an increased concentration of l'-zein can influence hardness and the formation of vitreous endosperm in normal genotypes, we derived 13 modified normal inbreds from a cross of the normalline W64A with Pool 34 QPM. Analysis of protein content, kernel density and hardness revealed variation among the 13 inbreds. The modified normal inbreds show an increased content of l'-zein in the endosperm, similar to that of QPM. But the high levei of l'-zein did not increase hardness and density above a threshold leveI. The modified normal inbreds did not have an increased Iysine content, suggesting modifier genes, per se, do not improve the nutritional quality of maize endosperm.  amolecular biology  aBiologia Molecular  aMilho  aProteína  aQualidade  aZea Mays  aOpaque 2  aOpaque-2  aProtein  aQuality1 aLOPES, M. A.1 aHABBEN, J. E.1 aHAMAKER, B. R.1 aLARKINS, B. A.  tCereal Chemistry, St. Paulgv. 72, n. 1, p. 94-99, 1995.