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The cucumber (Cucumis sativus) fruit is covered with bloom trichomes and warts (composed of spines and tubercules), which have an important impact on the commercial value of the crop. However, little is known about the regulatory mechanism underlying their formation. Here, we reported that the cucumber WD-repeat homolog CsTTG1, which is localized in the nucleus and cytomembrane, plays an important role in the formation of cucumber fruit bloom trichomes and warts. Functional characterization of CsTTG1 revealed that it is mainly expressed in the epidermis of cucumber ovary and that its overexpression in cucumber alters the density of fruit bloom trichomes and spines, thereby promoting the warty fruit trait. Conversely, silencing CsTTG1 expression inhibits the initiation of fruit spines. Molecular and genetic analyses showed that CsTTG1 acts in parallel to Mict/CsGL1, a key trichome formation factor, to regulate the initiation of fruit trichomes, including fruit bloom trichomes and spines, and that the further differentiation of fruit spines and formation of tubercules regulated by CsTTG1 is dependent on Mict Using yeast two-hybrid assay and bimolecular fluorescence complementation assay, we determined that CsTTG1 directly interacts with Mict. Collectively, our results indicate that CsTTG1 is an important component of the molecular network that regulates fruit bloom trichome and wart formation in cucumber.

plant physiology

CsTTG1 Encodes a WD-repeat Protein That Regulates Fruit Wart Formation in Cucumis sativus through Interaction with the Homeodomain-leucine Zipper I Protein Mict