Synopsis
Individual endosperm genes which affect the amylose fraction of corn starch were found to vary in effect due to inherent difference of source stocks. Double and triple recessive combinations of these genes have varying effects on amylose content. The ae gene is involved in the higher amylose endosperm combinations although it shows no corresponding effect on the pollen starch.
Synopsis
Extensive selection on the basis of laboratory analyses is necessary when transferring high amylose characters from source stocks into agronomically sound amylomaize hybrids. The effects of various gene combinations on the amylose‐amylopectin ratio of corn starch are discussed. Amylose content is shown to be influenced considerably by modifying factors interacting within the various endosperm genotypes.
I there have been three waxy mutations and one sweet mutation in dent corn since 1936. All of these mutations occurred in inbred lines. Apparently they are the same type of mutation as reported by Mangel~dorf,~ but they can definitely be identified as mutations because of their occurrence in inbred lines. The first waxy mutation probably occurred in 1936, although it was not observed until 1938. When it was first noticed in 1938, all kernels of one ear of the 1938 ear-row were waxy, while other ears in the same row bred true for dent or segregated in the ratio of 3 dent: I waxy. The line in which this mutation occurred was a third year self from a cross between open-pollinated Champion White Pearl and a yellow inbred which had been selfed for 8 years. The second mutation was observed in 1939 in an ear of a yellow line which had been inbred ear-to-row for 7 years. This inbred line, Bear 13, is one developed by the writer's father, A. Linn Bear, from FIG. left, Waxy 38-11 X Bear 13; right, Dent 38-11 X Bear 13.
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