01624naa a2200217 a 450000100080000000500110000800800410001910000180006024500710007826000090014952010580015865000170121665000170123365000240125065000140127465300110128865300090129970000170130870000200132577300610134516462392023-03-30       1978    bl uuuu     u00u1 u    #d1 aTORRES, A. M.  aLeaf isozymes as genetic markers in Citrus.h[electronic resource]  c1978  aThe genetic control fo isozymes from Citrus and its near relatives was determined for three gene/enzyme systems: glutamate oxaloacetate transaminase, phosphoglucose isomerase and phosphoglucose mutase. These enzymes are controlled by four genes having 19 codominant alleles, 12 of which occur in Citrus subg Citrus. Formal genetic studies were carried out with F1 biotypes and F1 populations of known origin. When biotypes were grouped into traditionally recognized species to examine genetic affinities within and between species, a remarkable patterm of uniformity of genotype combinations was found within a species, and every species had an unique combination. Because many economicaly important cultivars produce asexual(nucellar) as well as sexua(zygotic) embryos a central problem of the breeder is to distinguish these when plants are young, long before fruiting. Isozyme markers can be used with varying degrees of efficiency, depending on the genotypes of the particular parents, to distinguish nucellar seedlings from those of zygotic origin.  aEletroforese  aMelhoramento  aPoncirus Trifoliata  aTaxonomia  aCitros  aGens1 aSOOST, R. K.1 aDIEDENHOFEN, U.  tAmerican Journal of Botany.gv.65, N.8, p.869-881. 1978.