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Biochemical factors contributing to tomato fruit sugar content:a review

Published online by Cambridge University Press:  22 December 2011

Diane M. Beckles ,
Nyan Hong ,
Liliana Stamova  and
Kietsuda Luengwilai
Diane M. Beckles
Affiliation:
Dep. Plant Sci., Univ. Calif., One Shields Ave., Davis, CA 95616, USA. [email protected] ,
Nyan Hong
Affiliation:
Dep. Plant Sci., Univ. Calif., One Shields Ave., Davis, CA 95616, USA. [email protected] ,
Liliana Stamova
Affiliation:
1632 Santa Rosa St., Davis, CA 95616, USA
Kietsuda Luengwilai
Affiliation:
Dep. Plant Sci., Univ. Calif., One Shields Ave., Davis, CA 95616, USA. [email protected] , Current address: Dep. Hortic., Fac. Agric. Kamphaeng Saen, Kasetsart Univ., Kamphaeng Saen Campus Kamphaeng Saen Nakhon Pathom, 73140, Thailand

Abstract

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Introduction. Consumers and processors value tomatoes with high fruit sugarcontent; however, most breeding and cultural practices negatively impact this trait. Wildtomato species can accumulate two- to three-fold more fruit sugar than cultivars and areproving to be valuable both as a source of high-sugar loci to broaden thegenetic base of currently produced cultivars, and as research material to understand thistrait. Synthesis. While cutting-edge genomic approaches have taught us muchabout fruit phenotypes, it is still important to assess fruit enzyme activities andmetabolic fluxes in lines with contrasting fruit sugar accumulation. These metabolicfunctions are closest to the ripe fruit sugar trait. In this review, we focus ourattention on the biochemical pathways, especially starch biosynthesis, that may influencetomato fruit sugars. We try where possible to put this information into a physiologicalcontext because together they influence yield. We compare and contrast sugar metabolism incultivars and wild tomato species and identify factors that may influence differences intheir fruit size. Conclusion. Although difficult, we show that it is possibleto develop fruit with high horticultural yield and use the breeding line ‘Solara’ as anexample. In addition, we suggest avenues of further investigation to understand theregulation and control of fruit carbohydrate content.

Keywords

USASolanum lycopersicumfruitssugarscarbohydrate metabolismcarbohydrate contentÉtats-UnisSolanum lycopersicumfruitssucresmétabolisme des glucidesteneur en glucidesEUASolanum lycopersicumfrutasazucaresmetabolismo de carbohidratoscontenido de carbohidratos
Type
Review
Information
Fruits , Volume 67 , Issue 1 , January 2012 , pp. 49 - 64
Copyright
© 2012 Cirad/EDP Sciences

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