Interaction of Shrunken-2 and Sugary-1 in Dosage Series in Corn Endosperm
1974
Holder, D. G. | Glover, D. V. | Shannon, J. C.
The interaction of gone dosage on Zea mays L. endosperm carbohydrate composition was studied by quantifying carbohydrates from the 16 genotypes of 21-day-old endosperm resulting from all possible sib-pollinations and reciprocal crosses between lines homozygous for Su₁ Sh₂ (normal), su₁ Sh₂ (sugary-1), Su₁ sh₂ (shrunken-2), and su₁ sh₂ (sugary-l; shrunken-2). No dosage effects were produced by either the allele su₁ or the allele sh₂ for fructose and glucose sugars and starch content of the endosperm. There was a dosage effect of su₁ on sucrose content in the homozygous recessive sh₂ genotypes. Two and three doses of su₁ allele produced a 10 and 26% increase in sucrose content, respectively, over the zero or one dose level of su₁. Two doses of su₁ produced a very slight increase in water-soluble polysaccharide (WSP) and three doses produced large amounts of WSP typical of su₁. Two doses of sh₂ reduced the WSP content of the homozygous recessive su₁ genotype and the presence of three doses of sh₂ considerably decreased the amount of WSP accumulated at 21 days after pollination. The interaction effects suggested that WSP accumulation in homozygous su₁ may be affected by the dosage level of the sh₂ mutant. Starch synthesis was markedly decreased in homozygous recessive su₁, sh₂ and su₁ sh₂ genotypes.
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