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Plant and Cell Physiology, 1985, Vol. 26, No. 2 325-330
© 1985

Article

Nitrate and Other Anions in the Rice Phloem Sap

Hiroaki Hayashi and Mistsuo Chino

Department of Agricultural Chemistry, Faculty of Agriculture, University of Tokyo Bunkyo-ku, Tokyo 113, Japan

The anionic composition was determined for pure rice phloem sap which had been collected from brown planthopper stylets by cutting them with a YAG laser beam. The most abundant inorganic anion was Cl– at 52.1 mM. PO43– and SO42– were found at 8.1 mM and 1.8 mM, respectively. NO3– was present at 1.9 mM when the rice had been grown with nutrient solution containing 0.35 m of NO3– The phloem sap also contained malic, succinic and citric acid at 7.3, 3.0 and 3.2 mM respectively. Small amounts of other organic acids were also found.

(Received October 4, 1984; Accepted December 14, 1984)
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