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Interaction of Shrunken ‐2 and Sugary ‐1 in Dosage Series in Corn Endosperm 1
Author(s) -
Holder D. G.,
Glover D. V.,
Shan J. C.
Publication year - 1974
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1974.0011183x001400050011x
Subject(s) - endosperm , sucrose , starch , fructose , biology , reciprocal cross , carbohydrate , allele , genotype , mutant , botany , horticulture , zoology , biochemistry , hybrid , gene
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 Su 1 Sh 2 ( normal ), su 1 Sh 2 ( sugary‐1 ), Su 1 sh 2 ( shrunken‐2 ), and su 1 sh 2 ( sugary‐1 ; shrunken‐2 ). No dosage effects were produced by either the allele su 1 or the allele sh 2 for fructose and glucose sugars and starch content of the endosperm. There was a dosage effect of su 1 on sucrose content in the homozygous recessive sh 2 genotypes. Two and three doses of su 1 allele produced a 10 and 26% increase in sucrose content, respectively, over the zero or one dose level of su 1 . Two doses of su 1 produced a very slight increase in water‐soluble polysaccharide (WSP) and three doses produced large amounts of WSP typical of su 1 . Two doses of sh 2 reduced the WSP content of the homozygous recessive su 1 genotype and the presence of three doses of sh 2 considerably decreased the amount of WSP accumulated at 21 days after pollination. The interaction effects suggested that WSP accumulation in homozygous su 1 may be affected by the dosage level of the sh 2 mutant. Starch synthesis was markedly decreased in homozygous recessive su 1 , sh 2 and su 1 sh 2 genotypes.