FIGURE 1.

Auxin transport inhibition alters emergence, growth rate and angle of adventitious roots (ARs) in rice. (A) ARs were analyzed at the third node using stem sections kept in the dark for 3 days in the presence of NPA, 2,4-D or α-NAA at the concentrations indicated. Phenotypes of ARs exposed to the auxins 2,4-D or α-NAA or to the auxin transporter inhibitor NPA; bar=1 cm. (B) Percentage of penetrated ARs. (C) Average lengths of penetrated ARs. (D) Mean growth angles of ARs. Bars in B–D indicate means (±SE) of ARs measured from nine stems per treatment in three independent experiments. Different letters indicate statistically significant differences (P < 0.05; ANOVA with Tukey test).