The lack of enzymic browning in the wild potato species Solanum hjertingii compared with commercial Solanum tuberosum varieties |
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Authors: | I R GUBB J C HUGHES M T JACKSON J A CALLOW |
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Institution: | School of Biological Sciences, The University of Birmingham, P.O. Box 363, Birmingham, B15 2TT;A.F.R.C. Institute of Food Research, Norwich Laboratory, Colney Lane, Norwich, NR4 7UA |
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Abstract: | Enzymic browning of tuber tissue was evaluated quantitatively for 50 genotypes, representing seven accessions, of Solanum hjertingii, a wild potato species from north-east Mexico, together with five commercial varieties of Solanum tuberosum with a known range of enzymic browning. Ninety-four percent of S. hjertingii clones examined showed less browning than the commercial varieties, with 66% exhibiting half the ‘potential browning’ (a measure of the total enzymic browning resulting from disruption of cellular compartmentalisation in that system) of cv. Maris Piper, a low enzymic browning cultivar. Of these clones, 18 showed no visual discoloration when sliced. Results clearly indicate that the lack of enzymic browning in S. hjertingii is a ‘true’ character. The efficiency of one subjective and two objective methods for obtaining different measures of enzymic browning was assessed. Potential browning of a rehydrated freeze-dried powder was adopted as the most efficient technique for screening enzymic browning. |
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