Figure 11.

mor1-1 and rsw1-1 Morphological Phenotypes Are Additive.

Root elongation rates ([A] and [B]) and root diameters ([C] and [D]) were measured every 12 h for wild-type (squares), mor1-1 (diamonds), rsw1-1 (circles), and mor1-1 rsw1-1 (triangles) seedlings.

(A) Root elongation rates at 21°C. There is a gradual increase in elongation rates over time for all genotypes.

(B) Root elongation rates after transfer from 21 to 29°C at time 0. In response to the higher culture temperature, there is a transient increase in elongation rates in the wild type and, to a lesser extent, the mor1-1 and rsw1-1 mutants. By 72 h, wild-type elongation rates are similar to those measured in 21°C-grown roots but greatly diminished in mor1-1, rsw1-1, and the double mutant.

(C) Root diameters at 21°C remain constant for all genotypes.

(D) Root diameters after transfer from 21 to 29°C at time 0. Root diameter in the wild type remains unchanged but is increased greatly in all mutants. The increased root diameter of mor1-1 and rsw1-1 is additive in the double mutant.