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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
Affiliation:
Dep. Plant Sci., Univ. Calif., One Shields Ave., Davis, CA 95616, USA. dmbeckles@ucdavis.edu ,
Nyan Hong
Affiliation:
Dep. Plant Sci., Univ. Calif., One Shields Ave., Davis, CA 95616, USA. dmbeckles@ucdavis.edu ,
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. dmbeckles@ucdavis.edu , 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.

Information

Type
Review
Copyright
© 2012 Cirad/EDP Sciences