Uptake, transport and metabolism of cytokinin in moss protonema

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Uptake, transport and metabolism of cytokinin in the protonema of Funaria hygrometrica were studied using labelled kinetin (6-furfurylamino [8-^<14>C]-purine). All cells of the protonema, chloronema and caulonema, were able to take up kinetin, which was carried in the symplastic transport system from cell to cell. Radioactivity was especially accumulated in growing cells of the protonema. Kinetin was metabolized immediately after uptake. While only very little kinetin (less than 1%) remained as free kinetin and one part was immobilized in chromatographic separation [e.g. attached to proteins and incorporated into nucleic acids (17)], most of the remaining kinetin was metabolized to adenine derivatives. Exogenously supplied adenosine changed the metabolism of kinetin. In the caulonema, adenosine reduced the turnover of kinetin to other adenine derivatives and enhanced the content of labelling in the start fraction. Thus adenosine can stimulate cytokinin-dependent bud formation in moss protonema.
日本植物生理学会の論文