The mechanism of auxin uptake and accumulation in moss protonemata

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Abstract
Protonemata of the moss Funaria hygrometrica Sibth. (L.) show a strong pH dependence for auxin accumulation. IAA uptake is enhanced when the pH of the incubation medium is lowered from 7.6 to 4. In low light intensity grown protonemata (0.56 W m−2) a component of IAA uptake could be saturated by IAA; efflux of IAA could be inhibited by 2,3,5‐triiodobenzoic acid. This is explained by the presence of influx and efflux carriers for IAA. In protonemata grown at high light intensity (2.00‐2.30 W m−2) these carriers could not be shown to be present. These results are discussed with regard to the different physiological behavior of moss protonemata grown under different light conditions.