Analysis of GhFLA1 expression and function in overexpression and RNAi transgenic cotton plants. A, Maps of the GhFLA1 overexpression construct (top) and the RNAi construct (bottom). LB, Left border; ORF, open reading frame; RB, right border. B, Real-time RT-PCR analysis of the expression of GhFLA1 in overexpression plants (T2 generation). RNA was isolated from 10-DPA fibers. C, Real-time RT-PCR analysis of the expression of GhFLA1 in RNAi plants (T2 generation). RNA was isolated from 10-DPA fibers. D, Measurement of fiber length at 1 and 2 DPA (n ≥ 50 cotton ovules per line). E, Paraffin sections of 1- and 2-DPA cotton ovules. F, Measurement of fiber length at maturation (n ≥ 50 cotton ovules per line). G, Mature fibers of GhFLA1
RNAi plants. H, Mature fibers of GhFLA1 overexpression plants. Bars = 75 μm in E and 1 cm in G and H. Values shown are means ± sd. 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 fibers and the wild type (WT). OL, GhFLA1 overexpression transgenic lines; RL, GhFLA1
RNAi transgenic lines.