Figure 9.

Higher nitrate uptake in SDH1-1/sdh1-1 mutant plants. Wild-type (gray bar) and SDH1-1/sdh1-1 mutant (black bar) seedlings were grown for 2 weeks on solid medium containing 3 mm KNO₃ and 1% Suc. Nitrate uptake was then measured by incubating seedlings for 2 h in a solution with the same medium (3 mm KNO₃) containing 20% K¹⁵NO₃. Values are means ± se of six replicates, each containing 15 to 31 seedlings. Asterisks indicate a value that was determined by t test to be significantly different from the wild type (*** P < 0.01).