Variations in the <i>CRABS CLAW</i> modulate fruit elongation in cucumber

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Figure 1.
The model depicting roles of CsCRC alleles associated with fruit length variation in cucumber. (a) Schematic diagram of the origin of the CsCRC^A allele in cucumber. The Xishuangbanna cucumber was domesticated from a primitive cultivated cucumber that carried an SNP change in CsCRC, resulting in shorter fruit. In cultivated cucumber, CsCRC^G expression shows a positive correlation with fruit length. (b) A proposed model for CsCRC fine-tuning fruit elongation in cucumber. CsCRC^G positively regulates cell expansion and fruit elongation through direct binding to the promoter of CsARP1 and enhancing CsARP1 activity. CsCRC^A protein is unable to activate CsARP1 expression, resulting in reduced cell expansion and decreased fruit elongation.