Expression of the genes related to cell wall biosynthesis and immunohistochemical localization of pectin and hemicellulose in fibers of the transgenic cotton plants. A, Quantitative RT-PCR analysis of genes related to cell wall biosynthesis in 10-DPA fibers of GhFLA1 overexpression and RNAi transgenic cotton plants (T2 generation). Three individual T2 plants were sampled for each transgenic line. Error bars show se (n = 3). Independent Student’s t tests demonstrated that there was a significant difference (*P < 0.05) or a very significant difference (**P < 0.01) between transgenic lines and the wild type (WT). Accession numbers in GenBank are as follows: GhUER1 (FJ415167), GhUGD1 (FJ415166), GhUGP1 (FJ415164), GhSUS1 (U73588), GhGT47c (ES807557), GhCESE1 (ES812699). B, Paraffin sections of 1-DPA cotton ovules were used for immunohistochemical assay. Immunolocalization was carried out with antibodies CCRC-M1, JIM5, and JIM7, using PBS as a negative control. OL1, OL2, and OL3 (OE L3), GhFLA1 overexpression transgenic lines; RL3, RL4, and RL6 (RNAi L6), GhFLA1
RNAi transgenic lines. Bars = 75 µm.