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. 2021 Apr 29;22(9):4704. doi: 10.3390/ijms22094704

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Sugar transporters are involved in environmental stress mitigation. Under stressed conditions, overexpression of sugar transporters (SWEETs, SUTs/SUCs) in plants (right) enhances the transport of soluble sugars, such as sucrose from source leaves to the sink organs for fruit development. Meanwhile, under the same conditions, increased sucrose accumulation in the leaves of nontransgenic plants (left) inhibits sucrose export from the source leaves, limiting sink (fruit) growth and development.