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Endogenous IAA content (a) and relative expression of auxin response genes of white clover in different sets. ARF (b), GH3.1 (c), GH3.3 (d), GH3.5 (e), GH3.6 (f), GH3.9 (g), IAA8 (h), IAA27 (j) and Vertical columns represent Mean + STD (n = 4). The same letter indicates no significant difference and the different letters indicate a significant difference (Fisher’s LSD, P < 0.05) in a pairwise comparison between sets at the same time
