FIGURE 6.

(A) Germination is retarded by carboxin. Wild type seeds were sown on half-strength MS agar plates without carboxin or with varying concentrations of this complex II inhibitor. Germination was scored at different times. Values are means ± SD of three replicates, each containing 50–90 seeds. (B,C) Post-germinative growth of double sdh2.3/sdh2.1 mutants is more sensitive to carboxin inhibition. Seeds were sown on half-strength MS agar plates supplemented with different concentrations of carboxin, stratified, and grown under long-day conditions. (B) Cotyledon expansion was recorded at 5 days and values are means ± SD (each replicate containing 40–90 seeds). (C) Photographs were taken after 8 days of growth.