Developments in plant breeding for improved nutritional quality of soya beans I. Protein and amino acid content

Clarke, E. ORCID: 0000-0003-2784-6922 and Wiseman, J., 2000. Developments in plant breeding for improved nutritional quality of soya beans I. Protein and amino acid content. Journal of Agricultural Science, 134 (2), pp. 111-124.

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Abstract

Soya beans, like other legumes, contain low concentrations of the nutritionally essential sulphur amino acid, methionine. Cysteine, although not an essential amino acid because it can be synthesized from methionine, also influences the nutritional quality of soya bean products when it is only present in low levels. A low cysteine content will also aggravate a methionine deficiency. Soya bean lines deficient in 7S protein subunits have been identified. The 7S proteins contain substantially less methionine and cysteine than the 11S proteins. With the myriad of genetic null alleles for these subunits it may be possible to tailor the 7S/11S storage protein ratio and their total composition in seeds to include only those subunits with the richest sulphur amino acid composition. Cotyledon feeding experiments, using isolated soya bean cotyledons, demonstrated that addition of methionine to the culture media caused increased synthesis of both proteins and free amino acids but the mechanism by which this takes place is not clear.

Item Type: Journal article
Publication Title: Journal of Agricultural Science
Creators: Clarke, E. and Wiseman, J.
Publisher: Cambridge University Press
Date: 2000
Volume: 134
Number: 2
Rights: © Cambridge University Press 2000
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Depositing User: EPrints Services
Date Added: 09 Oct 2015 11:05
Last Modified: 09 Jun 2017 13:49
URI: http://irep.ntu.ac.uk/id/eprint/22674

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