期刊
TREES-STRUCTURE AND FUNCTION
卷 21, 期 4, 页码 433-442出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00468-007-0135-1
关键词
acropetal water transport; diurnal oscillation of trans-root electric potential; transpiration; xylem electrogenic ion pump; xylem pressure
类别
To investigate the seasonal changes in the physiological activity of the roots in field trees, Diospyros kaki, we carried out simultaneous and continuous measurements of the trans-root electric potential (TRP), of the rate of sap-flow with transpiration and of the xylem pressure (Px) through several years. The amplitude of the diurnal change and its temperature dependency of both TRP and Px began to increase in late January. These parameters attained their maxima in the late defoliate phase just before unfolding of new leaves at the end of March, thereafter rapidly went down to their minimal levels with increasing transpiration. The low levels continued during the foliate stage until December, and the pattern of the seasonal change in Px was inverse of that in the sap-flow rate. The role of the electrogenic ion pump activity across the interface between root-symplast and xylem vessel as a driving force for acropetal water transport is discussed in relation to those seasonal changes.
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