TRV-mediated VIGS of the CsPOR1 gene in tea seedling leaves. (A,B) WT, wild-type tea seedlings; pTRV2, infected seedlings with pTRV1 + pTRV2 Agrobacterium; pTRV2-CsPOR1-1 and pTRV2-CsPOR1-2, infected seedlings with pTRV1 + pTRV2-CsPOR1 Agrobacterium. (C) The expression of CsPOR1 was down-regulated in the photo-bleached leaves of tea seedlings. WT, wild-type tea seedlings; pTRV2, infected with pTRV1 + pTRV2 Agrobacterium; pTRV2-CsPOR1-1 and pTRV2-CsPOR1-2, infected with pTRV1 + pTRV2-CsPOR1 Agrobacterium. The error bars represent the mean ± SE of the three independent experiments. Different lowercase letters indicate a significant difference at p < 0.05 by Duncan’s multiple range test. SE, standard error; TRV, tobacco rattle virus; WT, wild type.