Regulation of ethylene production by phosphate in Penicillium digitatum

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Inorganic phosphate regulated ethylene production in shake cultures of Penicillium digitatum. Decreasing the phosphate level of the medium from 100 to 0.01 mM markedly increased, about 100-fold, the rate of ethylene production, in 96 hr, which was confined entirely to the fungal mycelium. Exogenous addition of between 0.01 to 100 mM phosphate, to high ethylene producing, low-phosphate cultures strongly inhibited their ethylene production and increased the ATP content of the mycelium. Phosphate also inhibited ethylene production in apple slices. Addition of calcium ions to the incubation medium stimulated the production of ethylene in apple slices, subhook epicotyl segments of pea and shake cultures of P. digitatum. We suggest that this stimulatory effect was caused by the reduction of inhibitory levels of phosphate, which complexed with calcium. Thus, phosphate in conjunction with calcium may play an important role in regulating ethylene production not only in P. digitatum but also in higher plants.
日本植物生理学会の論文