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Delivering enhanced fruit quality to the UK tomato industry through implementation of partial root-zone drying.

Theobald, Julian C. and Bacon, Mark A. and Davies, William J. (2007) Delivering enhanced fruit quality to the UK tomato industry through implementation of partial root-zone drying. Comparative Biochemistry and Physiology Part A: Molecular and Integrative Physiology, 146 (4 Supp). S241-S241. ISSN 1095-6433

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Abstract

Partial root-zone drying (PRD) is a deficit irrigation technology that exploits early root sensing of soil drying prior to any hydraulic stress and the chemical signals (e.g. ABA) that are generated, to modify shoot physiology and growth. In Australia PRD has been implemented in vineyards with significant improvements in irrigation water-use efficiency, decreased vegetative vigour and enhanced grape (and resultant wine) flavour and quality. Not dissimilarly, a top priority for the UK tomato industry is the improvement of quality and flavour to enhance tomato as a functional food crop. A PRD trial was established in a commercial glasshouse adopting the standard industry practice of soil-less culture with drip fertigation. Treatments comprised (1) plants rooted in single Rockwool slabs representing a current practice control (SSC), (2) plants with roots split evenly between two slabs with equal fertigation to both (DSC), and (3) as (2) but with fertigation alternated between each slab so that root halves experienced cycles of wetting and drying (PRD). Typically the PRD treatment significantly decreased leaf conductance (up to 30%), total sap flow (22% at mid-day) and decreased leaf area (24%), fresh weight (18%) and dry weight (22%). Individual fruit fresh weight and mean weekly yield through the season were not significantly affected by PRD, but PRD significantly increased both dry matter allocation (20%) to the fruit and the degree Brix (16%) compared to SSC treatment, with DSC treatment intermediate in response. Most significantly, the putative anti-cancer carotenoid lycopene was increased by up to 27% in PRD fruit.

Item Type: Article
Journal or Publication Title: Comparative Biochemistry and Physiology Part A: Molecular and Integrative Physiology
Uncontrolled Keywords: Partial root-zone drying ; tomato ; fruit ; lycopene ; brix
Subjects: S Agriculture > SB Plant culture
Departments: Faculty of Science and Technology > Lancaster Environment Centre
Faculty of Science and Technology
VC's Office
ID Code: 33920
Deposited By: Dr Julian C Theobald
Deposited On: 28 Jul 2010 16:19
Refereed?: No
Published?: Published
Last Modified: 06 Sep 2013 20:16
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/33920

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