Effect of L-kynerunine (L-kyn) treatment on root elongation of different genotypes.

<p>(<i>A</i>) Representative images of 4-day-old seedlings, transferred onto media with indicated L-kyn concentration at 2 dag. (<i>B</i>) Quantification of root length after 2 days of indicated L-kyn treatment. (<i>C</i>) Representative Nomarski optics images of mature root portions formed during indicated L-kyn treatment. Arrowheads point out top and bottom of individual cells in the 3^rd cortex layer; (<i>D</i>) Quantification of mature cortex cell length after 2 days of indicated L-kyn treatment. (<i>E–F</i>) Relative root elongation of indicated mutants and their respective wild type backgrounds after 2 days of indicated 5-methyl-tryptophan treatment. Size bars are 1 cm (<i>A</i>) or 100 µm (<i>C</i>); differences as compared to wild type or mock are not significant unless indicated otherwise; error bars indicate standard error; * = p<0.05; ** = p<0.01; *** = p<0.001.