CsNF-YC gene family function analysis. A) RT-qPCR analysis of CsNF-YCs gene expression in wild-type (WT) cucumber seedlings grown under light and dark conditions for 5 d. Data represent mean ± Sd of 3 biological replicates. B)CsNF-YCs expression following TRSV-CsNF-YCs treatment. Error bars represent mean ± Sd (n = 3). C) The phenotype of TRSV-CsNF-YCs-treated cucumber at 30 d post-treatment. Scale bar = 1 cm. D) The chlorophyll contents of CsNF-YCs gene-silenced cucumber plants. Error bars represent mean ± Sd (n = 9). Student's t-test was performed and statistically significant differences were indicated by *P < 0.05, **P < 0.01 A, B and D).