HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Holder, D. G. Articles by Shannon, J. C. Search for Related Content PubMed Articles by Holder, D. G. Articles by Shannon, J. C. Agricola Articles by Holder, D. G. Articles by Shannon, J. C.

Interaction of Shrunken-2 and Sugary-1 in Dosage Series in Corn Endosperm¹

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.

Key Words: Corn • Physiological genetics • Sugars • Water-soluble polysaccharide • Starch

² Former Graduate Research Assistant (now Research Geneticist, U.S. Sugar Corporation, Clewiston, Florida); Professor of Agronomy, Purdue University, West Lafayette, IN 47907; and Associate Professor of Horticultural Sciences, The Pennsylvania State University, University Park, PA 16802.

Received for publication April 6, 1973.