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Abstract

Summary.Light-induced tuber greening is one of the most important quality defects of potato.Although varietal and maturity factors are known to affect greening resistance, physiologicalmechanisms of resistance are poorly understood. We proposed that physiological and biochemical factors within the tuber periderm provide resistance and hypothesised that resistanceis primarily related to suberin content..We investigated differences in the tuber periderm between genotypes and tuber maturitiesthat varied in greening propensity. We examined suberin and light-induced pigment accumulation, and phellem cell development and studied greening propensity in mutant and chemically treated tubers with enhanced suberisation..Resistance to greening was strongly linked to increased suberin in the periderm, which varied with variety and tuber maturity. Furthermore, greening was reduced in mutant and chemically treated tubers with enhanced suberisation. Increases in phellem cell layers and lightinduced carotenoids and anthocyanins were identified as secondary resistance factors..Our work represents the first physiological mechanism of varietal and tuber maturity resistance to greening, expanding the known functionality of suberin and providing for the firsttime a biomarker that will aid producers and breeders in selection and improvement of potatovarieties for greening resistance.

Item Type:	Article
Authors/Creators:	Tanios, S and Thangavel, T and Eyles, A and Tegg, RS and Nichols, DS and Corkrey, R and Wilson, CR
Keywords:	anthocyanins, carotenoids, chlorophyll, phellem, potato, suberin, tuber greening resistance
Journal or Publication Title:	New Phytologist
Publisher:	Wiley-Blackwell Publishing Ltd.
ISSN:	1469-8137
DOI / ID Number:	https://doi.org/10.1111/nph.16334
Copyright Information:	Copyright 2019 the authors
Related URLs:	UTAS Profile: Eyles, A Google Scholar: Tegg, RS UTAS Profile: Tegg, RS Google Scholar: Nichols, DS UTAS Profile: Nichols, DS Google Scholar: Corkrey, R Google Scholar: Wilson, CR UTAS Profile: Wilson, CR
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