Studies on the environmental and endogenous factors which control the annual rhythm of root functions in deciduous tree

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Since the concentrations of K, Ca, glucose and protein have been shown to annually fluctuate in xylem sap of poplar, a deciduous tree, analysis of the exp ression of genes related to xylem sap substances was performed in root of Poplus maximowiczii, a native poplar in Japan. The homologous gene of K transporter, PmGORK-like1, was expressed constitutively after short day treatment, but the homologous genes fo r Ca transporter, PmACA-like1, and xylem sap proteins, PmXSP24 and PmXSP25 were induced by short day treatment and more strongly induced by following low temperature treatment. On the other hand, when the plant grown in long day condition was treated with ABA or low temperature, only PmGORK-like1 was strongly induced in root.