Is kingdom plantae aerobic or anaerobic?

Aerobic and anaerobic typically refer to microorganisms. Obligate anaerobes die in the presence of oxygen, and obligate aerobes die without it. Most plants occur in an oxygen-rich, terrestrial environment, and would thus be considered aerobic. Even totally aquatic plants, as those found in oceans, are exposed to some quantities of oxygen, thus it seems logical to surmise that if the terms aerobic and anaerobic are to be applied to macroscopic life such as plants, plants would be considered aerobic.