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. 2020 Oct 19;11:592596. doi: 10.3389/fgene.2020.592596

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Copyright © 2020 Ru, He, Zhu, Patrick and Ruan.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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A model of sugar transporters in response to elevated CWIN activity during tomato fruit development. CWIN degarades sucrose (Suc) into glucose (Glc) and fructose. CWIN activity could be tightly regulated by SlINVINHs and/or SldeCWIN1. Suc efflux may be facilitated by Suc-transporting SlSWEETs to the apoplasmic space. Elevated CWIN activity enhanced the expression of SlSWEET12c, which may unload extra Suc into cell wall space. Extra Glu produced through elevated CWIN activity is taken up by SlHT2 into the cytosol.