Influence of potassium nutrition on norflurazon activity in wheat

Wheat (Triticum aestivum L. cv Stacy) was grown hydroponically and 7‐day old seedlings were exposed to K⁺ (6, 12, 24, or 48mM) and/or norflurazon[4‐chloro‐5‐(methylamino)‐2‐(3‐(trifluoromethyl)phenyl)‐3(2H)‐pyrdazinone] (0, 0.05, 0.10, 0.20, 0.41, or 0.82 μM) for 14 days. Carotenoid content was decreased by high K⁺ nutrition (12–48 mM), but norflurazon‐induced inhibition of carotenogenesis was not observed at high K⁺ nutrition. Phytoene desaturation product concentrations were influenced by K⁺ nutrition.