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Plant Physiology 43:1931-1934 (1968)
© 1968 American Society of Plant Biologists

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Diurnal Pattern of Water Potential in Woody Plants

Betty Klepper1

Commonwealth Scientific and Industrial Research Organization, Division of Irrigation Research, Griffith, N. S. W. 2680, Australia

The dynamic relationship between the rates of water loss and uptake controls plant water status. Marked diurnal variations in water potential of both leaves and fruit occurred in all plants studied. Variations in water status during the day were most clearly related to changes in evaporative demand of the air and were different for the east and west sides of a tree. At night, the plant water potential reflected the soil moisture status.

Changes in the water potential of pear fruit were correlated with changes in fruit diameter. Since water loss from fruit occurred mostly through the pedicel into the xylem of the tree, the fruit could be used as a crude gauge of xylem water potential, which also showed dramatic changes during the day.

1 Present address: Department of Botany and Plant Pathology, Auburn University, Auburn, Alabama 36830.






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Copyright © 1968 by the American Society of Plant Biologists