Versatile Industrial Hemp
NAIHC - North American Industrial Hemp Council
A Renewable Industrial Fiber & Oil Crop

Dr. Paul G. Mahlberg's Cannabis Research
Enviro-Friendly Fields

NAIHC Board Member Dr. Paul G. Mahlberg is a Professor of Biology (plant biology) and Senior Fellow of the Institute of Molecular and Cellular Biology, Indiana University. He received his Ph.D. in Botany at the University of California, Berkeley and his MS and BS degrees in Botany at the University of Wisconsin, Madison. He has studied cannabis for over thirty years and has published over thirty articles on cannabis (Cannabis sativa), a tall annual dioecious plant group which includes both industrial hemp and marijuana. Wrote Laboratory Program in Plant Anatomy, and published two educational films. Served as a consulting editor to Academic Press in the preparation of ten monographs. Collaborated with Dr. Ivan Bocsa, Kompolt, Hungary, in a three-year USDA sponsored research study on hemp, and with Dr. Eun Soo Kim, Seoul, Korea, on organization and composition of glandular trichomes in cannabis and related plants. Served as a consultant to the United Nations Industrial Organization, Vienna, on industrial processing of raw opiates; to the University of Mississippi, School of Pharmacy, in its cannabis program; and to private companies in studies on secondary products of plants. Member of the board of directors of the Door County (Wisconsin) Land Trust which is dedicated to preservation of ecologically important land.  

One of only two federal DEA permits to grow cannabis in the United States is held by Dr. Mahlberg.  His research program began over thirty years ago and continues to the present, specializing in the ultra structure of the resin-producing gland and the biogenesis of its cannabinoids.  With his post-doctoral fellows and graduate students, he has explored these and other topics important to the definition of cannabis as either a drug or a fiber and food plant.

Dr. Mahlberg's most recent cannabis article, co-authored with his student Dr. Karl Hillig, is "A Chemotaxonomic Analysis of Cannabinoid Variation in Cannabis (Cannabaceae)." It was published in American Journal of Botany 91:966-975, 2004. A list of Dr. Mahlberg's technical reports on cannabis appears below, with Internet links where available. His studies were directed to analyses of various cannabinoids and related secretory products, and their subcellular localization during plant development.

As a teenager, Paul Mahlberg's decision to become a botanist was stimulated by summers at Door County's Kangaroo Lake in Wisconsin. Now retired from the biology faculty at Indiana University in Bloomington, he continues to do research on secretion by plant cells - and he has maintained his long-time connection with Door County. The latest example of this connection is that Dr. Mahlberg and his wife Marilyn Waite Mahlberg have co-authored Wildflowers of Door County, Wisconsin's Unique Floral Preserve, "A field guide to the wildflowers that can be found in one of the most unique and beautiful places in America."

------------------------------------------------

Cannabaceae Publications of Paul G. Mahlberg

39. Hillig, K. W., and P. G. Mahlberg. 2004. Chemotaxonomic analysis of cannabinoid variation in Cannabis (Cannabaceae). Amer. Jour. Bot. 91: 966-975. Link to Abstract, full text available for a subscription fee.

38. Mahlberg, P. G., and E. S. Kim. 2003. Accumulation of cannabinoids in the secretory cavity of Cannabis. Jour. Industr. Hemp 9: 15-36.

37. Kim, E. S., and P. G. Mahlberg. 2003. Secretory vesicle formation in the secretory cavity of glandular trichomes of Cannabis (Cannabaceae). Mol. Cells 15: 387-395. Link to Abstract which includes link to free full text.

36. Mahlberg, P. G. 2003. Reintroduction of industrial hemp into American agriculture. Wisconsin Flora 4:3-6.

35. Kim, E. S., and P. G. Mahlberg. 2000. Early development of the secretory cavity of peltate glands in Humulus lupulus L. (Cannabaceae). Mol. Cells 10:487-492.

34. Kim, E. S., and P. G. Mahlberg. 1999. Immunochemical localization of tetrahydro cannabinol (THC) in chemically fixed glandular trichomes of Cannabis (Cannabaceae). Jour. Biol. Sci. 3: 215-219.

33. Hammond, C. T., and P. G. Mahlberg. 1999. Phloroglucinol as a natural phenolic constituent of Humulus lupulus (Cannabaceae). Amer. J. Bot. 87: 2105.

32. Kim, E. S., and P. G. Mahlberg. 1997. Cytochemical localization of cellulase activity associated with secretory cavity formation in glandular trichomes of Cannabis (Cannabaceae). Jour. Plant Biol. 40: 61-66.

31. Kim, E. S., and P. G. Mahlberg. 1997. Plastid development in glandular trichomes of Cannabis (Cannabaceae). Mol. Cells 7: 352-359.

30. Kim, E. S., and P. G. Mahlberg. 1997. Immunochemical localization of tetrahydrocannabinol (THC) in cryofixed glandular trichomes of Cannabis (Cannabaceae). Amer. J. Bot. 83: 336-342. Link to Abstract, full text available for a subscription fee.

29. Kim, E. S., and P. G. Mahlberg. 1995. Glandular cuticle formation in Cannabis (Cannabaceae). Amer. J. Bot. 82: 1207-1214.

28. Hammond, C.T., and P. G. Mahlberg. 1994. Phloroglucinol glucoside as a natural constituent of Cannabis sativa. Phytochemistry 37: 755-756.

27. Mahlberg, P. G., and E. S. Kim. 1992. Secretory vesicle formation in glandular trichomes of Cannabis sativa L. (Cannabaceae). Amer. J. Bot. 79:166-173.

26. Mahlberg, P. G., and E. S. Kim. 1991. Cuticle development on glandular trichomes of Cannabis L. (Cannabaceae). Amer. J. Bot. 78:1113-1122.

25. Kim, E. S., and P. G. Mahlberg. 1991. Secretory cavity development of glandular trichome of Cannabis sativa L. (Cannabaceae). Amer. J. Bot. 78:142-151.

24. Hammond, C. T., and P. G. Mahlberg. 1990. Thin-layer chromatographic identification of phenol in the glandular secretory system of Cannabis sativa L. (Cannabaceae). Ind. Acad. Sci. 98:201-209.

23. Turner, J., and P. G. Mahlberg. 1988. In vivo incorporation of labeled precursors into cannabinoids in seedlings of Cannabis sativa L. (Cannabaceae) pp. 263-270. In, G. Chesher, P. Consroe and R. Musty (eds.), Marihuana. Australian Gov't. Publ.

22. Vogelmann, A., J. Turner, and P. G. Mahlberg. 1988. Cannabinoid composition in seedlings compared to adult plants of Cannabis sativa. J. Nat. Prod. 51:1075-1079.

21. Vogelmann, A., J. Turner, and P. G. Mahlberg. 1987. Cannabinoid occurrence in seedlings of Cannabis sativa L.: Quantitation in seedlings of known age and primary leaf length. Bot. Gaz. 148:468-477.

20. Turner, J., P. G. Mahlberg, V. Lanyon, and J. Pleszczynska. 1985. A temporal study of cannabinoid composition in continual clones of Cannabis sativa L. (Cannabaceae). Bot. Gaz. 146:32-38.

19. Vogelmann, A., J. Turner, and P. G. Mahlberg. 1984. Sequential appearance of cannabinoids during seedling development in Cannabis sativa L., pp. 18-23. In: Marihuana, D. Harvey (ed.). IRL Press, Oxford, UK.

18. Turner, J., and P. G. Mahlberg. 1984. Effects of sample treatment on chromatographic analysis of cannabinoids in Cannabis sativa L. (Cannabaceae). J. Chromatogr. 283:165-171.

17. Turner, J., and P. G. Mahlberg. 1984. Separation of acid and neutral cannabinoids in Cannabis sativa L. using HPLC, pp. 79-88. In: "Biology of Cannabinoids," W. Dewey, S. Agurell, and R. Willette (eds.). Academic Press, N.Y.

16. Mahlberg, P. G., J. Turner, J. Hemphill, and C. Hammond. 1984. Ultrastructure, development and composition of glandular trichomes of Cannabis, pp. 23-51. In: Biology and Chemistry of Plant Trichomes, E. Rodriguez, P. Healey, and I. Mehta (eds.). Pergamon Press, New York.

15. Mahlberg, P. G., and J. Hemphill. 1983. The effect of light quality on cannabinoid composition of Cannabis sativa L. (Cannabaceae). Bot. Gaz. 144:43-48.

14. Turner, J. and P. G. Mahlberg. 1982. Simple high-performance liquid chromatographic method for separating acidic and neutral cannabinoids in Cannabis sativa L. Jour. Chromatogr. 253:295-303.

13. Turner, J., J. Hemphill, and P. G. Mahlberg. 1982. Interrelationships of glandular trichomes and cannabinoid content. II. Developing leaves of Cannabis sativa L. (Cannabaceae). Bull. on Narc. 33:63-71.

12. Furr, M. and P. G. Mahlberg. 1981. Histochemical analyses of unbranched non articulated laticifers and capitate glandular hairs in Cannabis sativa L. (Cannabaceae). Jour. Nat. Prod. 41:153-159.

11. Lanyon, V., J. Turner, and P. G. Mahlberg. 1981. Quantitative analysis of cannabinoids in the secretory product from capitate-stalked glands of Cannabis sativa L. (Cannabaceae). Bot. Gaz. 142:316-319.

10. Turner, J., J. Hemphill, and P. G. Mahlberg. 1981. Interrelationships of glandular trichomes and cannabinoid content. I: Developing pistillate bracts of Cannabis sativa L. (Cannabaceae). Bull. on Narc. 33:59-69.

9. Hemphill, J., J. Turner, and P. G. Mahlberg. 1980. Cannabinoid content of individual plant organs from different geographical strains of Cannabis sativa L. (Cannabaceae). Jour. Nat. Prod. 43:112-122.

8. Turner, J., J. Hemphill, and P. G. Mahlberg. 1980. Trichomes and cannabinoid content in developing leaves and bracts of Cannabis sativa L. (Cannabaceae). Amer. J. Bot. 67:1397 1406.

7. Hammond, C. and P. G. Mahlberg. 1978. Ultrastructural development of capitate glandular hairs of Cannabis sativa L. (Cannabaceae). Amer. J. Bot. 65:140-151.

6. Turner, J., J. Hemphill, and P. G. Mahlberg. 1978. Studies on growth and cannabinoid composition of callus derived of Cannabis sativa. Lloydia 41:453-462.

5. Turner, J., J. Hemphill, and P. G. Mahlberg. 1978. Quantitative determination of cannabinoids in individual glandular trichomes of Cannabis sativa L. (Cannabaceae). Amer. J. Bot. 65:1103-1106.

4. Turner, J., J. Hemphill, and P. G. Mahlberg. 1978. Cannabinoid composition and gland distribution in clones of Cannabis sativa L. Bull. on Narc. 30:55-65.

3. Hammond, C. and P. G. Mahlberg. 1977. Morphogenesis of capitate glandular hairs of Cannabis sativa L. (Cannabaceae). Amer. J. Bot. 64:1023-1031.

2. Turner, J., J. Hemphill, and P. G. Mahlberg. 1977. Gland distribution and cannabinoid content in clones of Cannabis sativa. Amer. J. Bot. 64:687-693.

1. Hammond, C. and P. G. Mahlberg. 1973. Morphology for glandular hairs of Cannabis sativa L. from scanning electron microscopy. Amer. J. Bot. 60:524-528.

Return to Research Index Page

® 2006 NAIHC All rights reserved.
For questions on this site, contact 
Webmaster