Effect of sugars on auxin-mediated LeEXPA2 gene expression

The paper deals with the effect of sugars on LeEXPA2 expression in tomato (Lycopersicon esculentum) hypocotyl segments, which is a well-studied system for analysis of cell elongation. We tested the interactions between sugars and different plant hormones classically known to be involved in plant growth. We found the induction of LeEXPA2 transcript accumulation to be positively affected by the presence of sucrose and other metabolizable sugars. The effect mediated by sorbitol and by a non-metabolizable glucose analogue (3-O-methyl glucose) is lower, while the structural analogue of sucrose, turanose, leads to any auxin-induced increase in LeEXPA2 transcript abundance.