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2. DAWSON, R. F. 1945. An experimental analysis of alkaloid production in Nicotiana: the origin of nornicotine. Am. J. Botany 32: 416-23. 3. DAWSON, R. F. AND M. L. SOLT. 1959. Estimated contributions to root and shoot to the nicotine content of the tobacco plant. Plant Physiol. 34: 656-61. 4. JEFFREY, R. N. 1959. Alkaloid composition of species of Nicotiana. Tobacco Sci. 3: 89-93. D. JEFFREY, R. N. AND W. H. EOFF. 1955. Paper chromatographic method for determining alkaloids in tobacco. Anal. Chem. 27: 1903-05. 6. LADESIC, B. AND T. C. Tso. 1963. Methylation of Nl5-nornicotine with L-methionine-methyl-Cl4 in tobacco plants. 17th Tobacco Chemists Research Conference, Sept. 22, Montreal, Canada. (Biochemical Studies of tobacco alkaloids. VI. Biosynthesis of nicotine through nornicotine. Phytochemistry. in press). 7. MASHKOVTSEV, M. F. AND A. A. SIROTENKO. 1951. Ability of the above-ground part of N. tabaculm to synthesize nicotine. Dokl. Akad. Nauk, SSSR 79: 487-89. 8. MOTHES, K. AND A. ROMEIKE. 1951. The accumulation of alkaloids in the organs of storage and reproduction. Biol. Zentr. 70: 97-113. 9. SOLT, M. L. 1957. Nicotine production and growth of tobacco scions on tomato root stocks. Plant Physiol. 32: 484-90. 10. STEPKA, W. AND L. J. DEWEY. 1961. Conversion of nicotine to nornicotine in harvested tobacco: fate of the methyl group. Plant Physiol. 36: 592-97. 11. Tso, T. C. 1963. Nornicotine as a precursor of nicotine in Nicotiana plants. Botan. Bull. Acad. Sinica 4 No. 2: 75-79. 12. Tso, T. C. AND R. N. JEFFREY. 1953. Paper chromatography of alkaloids and their transformation products in Maryland tobacco. Arch. Biochem. Biophys. 43: 269-85. 13. Tso, T. C. AND R. N. JEFFREY. 1957. Studies on tobacco alkaloids. II. The formation of nicotine and nornicotine in tobacco supplied with N15. Plant Physiol. 32: 86-92. 14. Tso, T. C. AND R. N. JEFFREY. 1959. Biochemical studies on tobacco alkaloids. I. The fate of labeled tobacco alkaloids supplied to Nicotiana plants. Arch. Biochem. Biophys. 80: 46-56. 15. WILLITS, C. O., M. L. SWAIN, J. A. CONNELLY, AND B. A. BRICE. 1950. Spectrophotometric determination of nicotine. Anal. Chem. 22: 430-33.

Alteration of Oxidative Enzymes in Potato Tuber Tissue by Infection with Phytophthora infestans