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Annals of Botany 86: 1153-1160, 2000
© 2000 Annals of Botany Company

Accumulation of Hydroxycoumarins During Post-harvest Deterioration of Tuberous Roots of Cassava (Manihot esculenta Crantz)

Holger Buschmann+, Maria X. Rodriguez, Joe Tohme and John R. Beeching§

Department of Biology & Biochemistry, University of Bath, Bath, BA2 7AY, UK Centro International de Agricultura Tropical, CIAT, Cali, A.A. 6713, Colombia

Received: 8 May 2000 ; Returned for revision: 29 June 2000 . Accepted: 23 August 2000

The use of the root crop Cassava (Manihot esculenta Crantz) is constrained by its rapid deterioration after harvest. Chemical and spectroscopic examination revealed the accumulation of four hydroxycoumarins (esculin, esculetin, scopolin and scopoletin), compounds derived from the phenylpropanoid pathway, during the time course of post-harvest deterioration. Fluorescence-microscopy revealed their localization in the apoplast of the parenchyma. Scopoletin and scopolin showed the most dramatic increases in concentration, peaking by day 2 after harvesting. A smaller secondary peak of scopoletin tended to be more pronounced in cultivars showing lower susceptibility to deterioration. Evidence for the metabolism of scopoletin to an insoluble coloured product by means of a peroxidase is presented. This product may be the cause of the discolouration of the vascular tissue during storage. Copyright 2000 Annals of Botany Company

Cassava, hydroxycoumarins, Manihot esculenta, peroxidases, post-harvest physiological deterioration, wound response


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R. GOMEZ-VASQUEZ, R. DAY, H. BUSCHMANN, S. RANDLES, J. R. BEECHING, and R. M. COOPER
Phenylpropanoids, Phenylalanine Ammonia Lyase and Peroxidases in Elicitor-challenged Cassava (Manihot esculenta) Suspension Cells and Leaves
Ann. Bot., July 1, 2004; 94(1): 87 - 97.
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