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Toughing it outódisease-resistant potato mutants have enhanced tuber skin defenses


Thangavel, T and Tegg, RS and Wilson, CR, Toughing it out disease-resistant potato mutants have enhanced tuber skin defenses, Phytopathology, 106, (5) pp. 474-483. ISSN 0031-949X (2016) [Refereed Article]

Copyright Statement

Copyright 2016 The American Phytopathological Society

DOI: doi:10.1094/PHYTO-08-15-0191-R


Common scab, a globally important potato disease, is caused by infection of tubers with pathogenic Streptomyces spp. Previously, disease-resistant potato somaclones were obtained through cell selections against the pathogenís toxin, known to be essential for disease. Further testing revealed that these clones had broad-spectrum resistance to diverse tuber-invading pathogens, and that resistance was restricted to tuber tissues. The mechanism of enhanced disease resistance was not known. Tuber periderm tissues from disease-resistant clones and their susceptible parent were examined histologically following challenge with the pathogen and its purified toxin. Relative expression of genes associated with tuber suberin biosynthesis and innate defense pathways within these tissues were also examined. The disease-resistant somaclones reacted to both pathogen and toxin by producing more phellem cell layers in the tuber periderm, and accumulating greater suberin polyphenols in these tissues. Furthermore, they had greater expression of genes associated with suberin biosynthesis. In contrast, signaling genes associated with innate defense responses were not differentially expressed between resistant and susceptible clones. The resistance phenotype is due to induction of increased periderm cell layers and suberization of the tuber periderm preventing infection. The somaclones provide a valuable resource for further examination of suberization responses and its genetic control.

Item Details

Item Type:Refereed Article
Keywords:suberin, potato, common scab, thaxtomin A, Streptomyces, scabies
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Horticultural production
Research Field:Horticultural crop protection (incl. pests, diseases and weeds)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural crops
Objective Field:Field grown vegetable crops
UTAS Author:Thangavel, T (Dr Tamil Thangavel)
UTAS Author:Tegg, RS (Dr Robert Tegg)
UTAS Author:Wilson, CR (Professor Calum Wilson)
ID Code:106490
Year Published:2016
Web of Science® Times Cited:24
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2016-02-11
Last Modified:2017-11-06

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