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JXB Advance Access published online on June 27, 2007
Journal of Experimental Botany, doi:10.1093/jxb/erm126
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© 2007 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

Analysis of citrate accumulation during peach fruit development via a model approach

BH Wu1, M Génard2,*, P Lobit3, JJ Longuenesse2, F Lescourret2, R Habib2 and SH Li1

1Institute of Botany, Chinese Academy of Sciences, 100093 Beijing, PR China
2UR1115 Plantes et Systèmes de culture Horticoles, INRA, F-84000 Avignon, France
3Instituto de Investigaciones Agropecuarias y Forestales, Universidad Michoacana de San Nicolás de Hidalgo, Tarimbaro, Michoacán, CP. 58880, Mexico

* To whom correspondence should be addressed. E-mail: michel.genard{at}avignon.inra.fr

Based on the citrate model of Lobit and colleagues and measured data, a new model, which is able to reproduce the variation over time of citrate concentration in two peach cultivars, has been proposed. As in the original one, the new model calculates the rate of citrate synthesis or degradation as the product of a ‘synthesis potential’ and an ‘efficiency level’. While in the old model the ‘efficiency level’ was a simple linear function of temperature and respiration, in the new one its relationship with respiration is accounted for by a coefficient that decreases throughout fruit development. The differences in model parameters between the two cultivars were investigated: late-maturing cv. Suncrest had significantly lower citrate synthesis potential than mid-maturing cv. Fidelia. The responses of citrate concentration to model parameters, temperature, fruit respiration, and growth curves were studied. The most important parameter in the new model, k4,2, represented the date when the relationship between respiration and ‘efficiency level’ changed from positive to negative. Raising mean temperature increased the citrate concentration at the beginning and decreased it near maturity for cv. Suncrest, while citrate concentration increased throughout fruit development and more strongly for cv. Fidelia. An increase in the mesocarp dry weight increased both fruit respiration and citrate concentration at the beginning of fruit development, while near maturity it increased fruit respiration but decreased citrate concentration. The model was also able to reproduce the effect of assimilate supply (leaf:fruit ratio). Further potential uses of the model were discussed.

Key words: Citrate, fruit, leaf:fruit ratio, metabolism, model, peach

Received 15 February 2007; Revised 11 May 2007 Accepted 14 May 2007


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