Differential Fertilization Involving Chromosome 6 Loci in Maize 1

MATERIALS AND METHODS A homozygous Y1 Su2 plant was pollinated by a homozygous y1 su2 plant (y is a mutable allele at the Y1 locus). An occasional white and yellow mosaic endosperm will occur. However, the mutation rate of the y stock used in this study is very low and the occasional mutant will be listed as white endosperm. The Y Su/ysu progeny were grown and individual plants crossed to homozygous y su and ysu plants. Some reciprocal crosses were made with either homozygous y su or ysu plants (or both, using first and second ears or tillers). Also six of the Y Su/ysu progeny were selfed. The homozygous ysu plant, used in the production of the above heterozygotes, was also selfed and the progeny used as the ysu stock in this experiment except in cases where the use of recovered ysu stocks is indicated. Progeny from three sib pollinations in a homozygous y su stock were used throughout this experiment except for recovered stocks as noted. The recovered homozygous ysu and y su stocks were obtained by crossing the above recessive stocks to inbred lines Oh5lA and Oh43 and recovering recessive homozygotes from selfed and sibbed progeny. Two recovered ysu and two recovered y su testers were used.