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Genetic Control of Phytoglycogen Accumulation in Maize (Zea mays L.)¹

Investigations of the role of the genes ae and su₂ in phytoglycogen accumulation in maize endosperms were conducted by quantitating and characterizing the watersoluble polysaccharides (WSP) from the 16 genotypes of endosperm resulting from all possible crosses betweenlines homozygoufso r normal(Ae Su), ae, su₁, and ae su₁. The WSP was extracted in a mercuric chloride solution and enzymatically hydrolyzed to glucose, then measured as reducing sugar.

Only the endosperms homozygous for su₁ contained phytoglycogen. Increased doses of ae decreased the amount of phytoglycogen at 20 days after pollination from 38.8 to 4.2% of the dry weight. The ß-amylolysis limit of the phytoglycogen from the double mutant suggested that it may be a more loosely branched polysaccharide.

Key Words: amylose-extender • sugary-one • dosage effectS • endosperm • water-soluble polysaccharides • corn mutations

² Formerly Graduate Fellow, now Assistant Professor of Plant Pathology, Departnrent of Plant Pathology and Associate Professor of Plant Breeding, Department of Horticulture, The Pennsylvania State University, University Park, Pa. 16802.

Received for publication April 10, 1969.