A sugar-inducible protein kinase, VvSK1, regulates hexose transport and sugar accumulation in grapevine cells.

Plant Physiology
Fatma LecourieuxSerge Delrot

Abstract

In grapevine (Vitis vinifera), as in many crops, soluble sugar content is a major component of yield and economical value. This paper identifies and characterizes a Glycogen Synthase Kinase3 protein kinase, cloned from a cDNA library of grape Cabernet Sauvignon berries harvested at the ripening stage. This gene, called VvSK1, was mainly expressed in flowers, berries, and roots. In the berries, it was strongly expressed at postvéraison, when the berries accumulate glucose, fructose, and abscisic acid. In grapevine cell suspensions, VvSK1 transcript abundance is increased by sugars and abscisic acid. In transgenic grapevine cells overexpressing VvSK1, the expression of four monosaccharide transporters (VvHT3, VvHT4, VvHT5, and VvHT6) was up-regulated, the rate of glucose uptake was increased 3- to 5-fold, and the amount of glucose and sucrose accumulation was more than doubled, while the starch amount was not affected. This work provides, to our knowledge, the first example of the control of sugar uptake and accumulation by a sugar-inducible protein kinase.

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Citations

May 4, 2012·Journal of Experimental Botany·Mohammad Reza Bolouri Moghaddam, Wim Van den Ende
Sep 7, 2012·Plant & Cell Physiology·Jérémy PilletDavid Lecourieux
Nov 19, 2011·BMC Plant Biology·Grant R CramerKazuo Shinozaki
Jan 15, 2013·Journal of Experimental Botany·Philippe NicolasFatma Lecourieux
Dec 11, 2013·Journal of Experimental Botany·Fatma LecourieuxSerge Delrot
Oct 10, 2012·Plant Biotechnology Journal·John W PatrickRobert G Birch
Jun 24, 2020·International Journal of Molecular Sciences·Jingjue ZengJianmin Tao
Dec 19, 2019·Frontiers in Plant Science·Muriel QuinetStanley Lutts
Jan 31, 2020·BMC Plant Biology·Chong RenZhenchang Liang
Sep 29, 2020·Frontiers in Plant Science·Sara Durán-SoriaJosé G Vallarino
Jan 29, 2021·Frontiers in Plant Science·You-Mei LiZhao-Sen Xie
Mar 2, 2021·Horticulture Research·Chong RenZhenchang Liang

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