Figure 4.

The mutation in bri1^cnu4 negatively affects RECEPTOR-LIKE PROTEIN 44 (RLP44) function. A, Frequency of roots with the indicated number of metaxylem cells in Col-0, rlp44^cnu2, bri1^cnu4, and the rlp44^cnu2 bri1^cnu4 double mutant (left) and example of fuchsin-stained xylem cells in Col-0 and bri1^cnu4 (right). Asterisks indicate statistically significant difference from Col-0 based on Dunn’s post hoc test with Benjamini-Hochberg correction after Kruskal-Wallis modified U test (*P < 0.05); n = 28–45 as indicated. Scale bars = 10 µm. B, Morphological phenotype of Col-0, rlp44^cnu2, bri1^cnu4, and the rlp44^cnu2 bri1^cnu4 double mutant. Scale bar = 1 cm.