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.
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