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2025, Number 1

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Rev Educ Bioquimica 2025; 44 (1)

Los transportadores SWEETS: proteínas esenciales en el transporte de azúcares en las plantas

López-Coria M, King-Díaz B, Sánchez-Nieto S

Language: Spanish
References: 45
Page: 10-23
PDF size: 1536.69 Kb.


ABSTRACT

Plants are a mosaic of autotrophic and heterotrophic tissues. The first are named source tissues and they can export sugars at the phloem at a concen-tration of 0.34 to 1.5 M. The heterotrophic tissues, named sink tissues, depend on the sugars that the source tissues export. Sugar transport between both tissues is vital for the plant and occurs by means of the symplastic and apoplastic pathways. In the symplastic pathway, sugars are mobilized through cell-cell connections named plasmodesmata. In the apoplastic pathway, the sugar influx and efflux from cells are mediated by membrane transporters like the SWEETs transporters which mobilize glucose, fructose, or sucrose down the concentration gradient. SWEETs are needed for the massive movement of sugars in phloem loading, nectar formation throughout embryogenesis, seed germination, and plant-pathogen interaction. Understanding the function of SWEETs may help increase the productivity of plants.


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