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. 2018 Jun 12;69(18):4323–4337. doi: 10.1093/jxb/ery219

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© The Author(s) 2018. Published by Oxford University Press on behalf of the Society for Experimental Biology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 5. — GhARF2 and GhARF18 genes are responsive to auxin in fibre cell initiation. (A) Endogenous IAA levels in wild-type and fl mutant ovules during seed fibre initiation. The bar represents the SD for three samples. (B) The expression level of GhARF2 and GhARF18 subfamily genes in wild-type and fl mutant ovules at 0 DPA. (C) Exogenous NAA promotes the transcription of GhARF2 and GhARF18. Relative expression levels of each gene were determined after normalizing to the expression level in CK ovules, which was set to 1.0. Statistical signiﬁcance was determined using one-way ANOVA combined with Tukey’s test. *P<0.05; **P<0.01; ***P<0.001.