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Plant and Cell Physiology, 1991, Vol. 32, No. 3 403-408
© 1991

Article

The Characteristics of the Adjustment in the pH of the Xylem Exudate of Segments of Vigna Hypocotyls during Xylem Perfusion

Akiko Mizuno1 and Kiyoshi Katou2

1Nihon Fukushi University, Mihama-cho Chita-gun Aichi, 470-32 Japan
2Biological Institute, Faculty of Science, Nagoya University Furo-cho, Chikusa-ku, Nagoya, 464-01 Japan

The xylem vessels of segments of Vigna hypocotyl were perfused with solutions of various pH values. With both acid and alkaline perfusion solutions, the pH of the xylem exudate tended to equilibrate at approximately 6 during the course of xylem perfusion. This phenomenon was observed both in air and under anoxia, and also in segments pretreated with methanol or preheated in a microwave oven. Therefore, the adjustment in pH does not depend on the respiratory metabolism but originates in the buffering action of the xylem wall apoplast. High concentrations of protons induced the release of other cations into the xylem exudate under anoxia, and high concentrations of K+ or Ca2+ ions induced the release of protons into the xylem under anoxia. These results indicate that a cation-exchange reaction on the xylem cell wall was responsible for the buffering effect. The physiological role of the high buffering capacity of the xylem wall apoplast is discussed in light of the role of the proton pump of the plasmalemma in elongation growth.

(Received September 25, 1990; Accepted January 21, 1991)
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