The role of carbohydrates in wound-healing of sweetpotato roots at low humidity

Rees, D. and van Oirschot, Q.A.E. and Aked, J. (2008) The role of carbohydrates in wound-healing of sweetpotato roots at low humidity. Postharvest Biology and Technology, 50. pp. 79-86.

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It has previously been shown that sweetpotato cultivars differ in the efficiency by which their roots can heal wounds at low humidity, although this does not appear to relate to rate of wound-healing at high humidity. It has also been shown previously that there is a negative relationship between cultivar root dry matter (DM) content and efficiency of root wound-healing at low humidity (assessed by a lignification score; LS). Root DM content tends to be negatively related to root sugar levels. The study presented here was undertaken to examine further the role of carbohydrates in root response and ability to heal wounds in the presence of water stress. Data from17 cultivars confirmed the negative correlation between LS and DM and the positive correlation between LS and root sugar levels. Measurement of sugar levels at the root surface both at the time of wounding and after complete healing (5 days) for 10 cultivars indicated a stronger relationship of LS with final sugar levels than initial DM content. This was confirmed in further experiments using a systemof adjacent tissue cuboids cut fromthe parenchymawhichwere able to exhibit lignification almost as efficiently as whole roots. With this system it was also possible to demonstrate a relatively rapid accumulation of sugars within 24 h of healing. The data were examined further by the development of linear regression models of LS. Comparison of the levels of variance accounted for by the models indicates that LS is strongly cultivar dependent, and most of the cultivar effect is related to cultivar differences in sugar levels during wound-healing. Differences in sugar levels between roots/cuboids of each cultivar also have an effect. Further, the similarity of the models for the whole roots and cuboids gives us confidence in the validity of using the cuboids to investigate wound-healing of whole roots.

Item Type: Article
Additional Information: This publication is an output froma research project funded by the United Kingdom Department for International Development (DFID) for the benefit of developing countries. The views expressed are not necessarily those of DFID [R7520: Crop Post-Harvest Research Programme].
Uncontrolled Keywords: Wound-healing, Sweetpotato, Carbohydrates, Water stress, Lignification
Author Affiliation: Natural Resources Institute, University of Greenwich, Central Avenue, Chatham, Kent ME4 4TB, United Kingdom
Subjects: Crop Improvement > Biotechnology
Divisions: General
Depositing User: Mr Siva Shankar
Date Deposited: 12 Dec 2012 06:25
Last Modified: 12 Dec 2012 06:25
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