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The carbohydrate and protein composition of the endosperm, embryo and testa of the seed of Gleditsia triacanthos
Author(s) -
Mazzini María N.,
Cerezo Alberto S.
Publication year - 1979
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740300909
Subject(s) - endosperm , residue (chemistry) , polysaccharide , chemistry , cell wall , biochemistry , embryo , carbohydrate , composition (language) , mannose , galactose , amino acid , botany , biology , linguistics , philosophy , microbiology and biotechnology
The internal morphology of the seed of Gleditsia triacanthos (Leg.) was microscopically observed and the presence of secondary, lignified cell walls was determined in the testa; the embryo and the endosperm only contained primary cell walls. The analysis of the carbohydrates showed that the endosperm is composed only of galactomannans, with different mannose: galactose ratios. The carbohydrates of the embryo and testa are of two classes: polysaccharides, not extractable by boiling water and oligosaccharides, soluble in 75 % ethanol which, possibly, contain amino acids in their molecule. The amino acid composition of the seed is similar to the composition of the reserve proteins of Leguminosae seed. This happens also with the composition of the water‐insoluble residue of the embryo and with some proteins isolated from the embryo. The amino acid composition of the water‐insoluble residue of the testa showed characteristics of cell wall proteins. The composition of the water‐insoluble residue of the endosperm is intermediate between those mentioned.