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Pathogen stress often significantly decreases cucumber production. However, knowledge regarding the molecular mechanism and signals of cucumber disease resistance is far from complete. Here, we report two translationally controlled tumor protein genes,  CsTCTP1  and  CsTCTP2 , that are both negative modulators in the  Cucumis sativus  defense response to  Sphaerotheca fuliginea . Subcellular localization analysis showed that CsTCTP1 and CsTCTP2 were both localized in the cytoplasm. Expression analysis indicated that the transcript levels of  CsTCTP1  and  CsTCTP2  were linked to the degree of cucumber resistance to  S. fuliginea . Transient overexpression of either  CsTCTP1  or  CsTCTP2  in cucumber cotyledons impaired resistance to  S. fuliginea , whereas silencing of either  CsTCTP1  or  CsTCTP2  enhanced cucumber resistance to  S. fuliginea.  The relationship of several defense-related genes and ABA and target of rapamycin (TOR) signaling pathway-related genes to the overexpressing and silencing of  CsTCTP1 / CsTCTP2  in non-infested cucumber plants was investigated. The results indicated that  CsTCTP1  participates in the defense response to  S. fuliginea  by regulating the expression of certain defense-associated genes and/or ABA signaling pathway-associated genes, and  CsTCTP2  participates through regulating the expression of TOR signaling pathway-associated genes. Our findings will guide enhancing the resistance of cucumber to powdery mildew.

frontiers in plant science

The Two Translationally Controlled Tumor Protein Genes, CsTCTP1 and CsTCTP2, Are Negative Modulators in the Cucumis sativus Defense Response to Sphaerotheca fuliginea