Marc Cohn

Title Professor Emeritus
Department Plant Pathology and Crop Physiology Department
E-mail MCohn@agcenter.lsu.edu
Address 1 LSU Campus 302 Life Sciences Bldg.
Baton Rouge, LA 70803
Phone 225-578-1322

Refereed Journal Articles
Chappell, J., F. D. Gatz, and M. A. Cohn. 2005. A viability test for Spartina alterniflora. Seed Science & Technology (in preparation).



Johnson, D., D. R. Gossett, S. W. Banks and M. A. Cohn. 2005. Seed dormancy in red rice. Changes in GSH, GSSG, cysteine, and cystine during dry afterripening. Seed Science Research (in preparation).



Gianinetti, A. and M. A. Cohn. 2004. Seed dormancy in red rice. Interaction of dry afterripening and incubation temperature. Seed Science Research (in peer review).


Gianinetti, A. and M. A. Cohn. 2004. Seed dormancy in red rice. Population-based analysis of afterripening with a hydrotime model. Seed Science Research (in peer review).



Cohn, M. A. 2004. Dormancy: an overview. pp. xxx-xxx in Black, M.; Bewley, J. D.; Halmer, P. (Eds) Encyclopedia of seeds. Science, Technology and Uses. Wallingford, CABI Publishing (in press).



Cohn, M. A. 2002. Seed dormancy in red rice. A balance of logic and luck. Weed Science 50:261 - 266.



Footitt, S. and M. A. Cohn. 2001. Developmental arrest: from sea urchins to seeds. Seed Science Research 11:3 - 16.



Doherty, L. C. and M. A. Cohn. 2000. Seed dormancy in red rice (Oryza sativa). XI. Commercial liquid smoke elicits germination. Seed Science Research 10: 415 - 421.



Oard, J.; M. A. Cohn; S. Linscombe; D. Gealy; K. Gravois. 2000. Field evaluation of seed production, shattering and dormancy in hybrid populations of transgenic rice (Oryza sativa) and the weed, red rice (Oryza sativa). Plant Science 157: 13 - 22.



Cohn, M. A. and H. W. M. Hilhorst. 2000. Alcohols that break seed dormancy: the anesthetic hypothesis, dead or alive? in J.D.Viemont and J.Crabbe (eds) Dormancy in Plants: From Whole Plant Behaviour to Cellular Control. CAB Publishing, Wallingford. pp 259 - 274.



Hilhorst, H. W. M. and M. A. Cohn. 2000. Are cellular membranes involved in the control of seed dormancy? in J.D.Viemont and J. Crabbe (eds) Dormancy in Plants: From Whole Plant Behaviour to Cellular Control. CAB Publishing, Wallingford. pp 275 - 289.



Other

Program Milestones (Reprints avaliable upon request)

  1. First report of rapid seed acidification after contact with dormancy-breaking chemicals (Footitt, S.; M. A. Cohn. 1992. Seed dormancy in red rice. VIII. Embryo acidification during dormancy- breaking and subsequent germination. Plant Physiol 100:1196 - 1202).
  2. First report of rapid glycolytic activation after contact with dormancy-breaking chemicals. This is still the most rapid biochemical/molecular response to a dormancy-breaking chemical in the published literature (Footitt, S.; M. A. Cohn. 1995. Seed dormancy in red rice. IX. Levels of fructose 2,6-bisphosphate in red rice embryos during dormancy-breaking and germination. Plant Physiol 107:1365 - 1370).
  3. First to report that applied chemicals must be metabolized before they break dormancy. Kinetics of metabolites, inhibitor studies, enzymology (Footitt, S.; D. Vargas; M. A. Cohn. 1995. Seed dormancy in red rice. X. A 13-C NMR study of metabolism of dormancy-breaking chemicals. Physiol Plant 94:667 - 671).
  4. First use of computational chemistry to the model and design of dormancy-breaking chemicals (Cohn, M. A. 1997. QSAR modeling of dormancy-breaking chemicals. Pp. 289 - 295 in RH Ellis et al. (ed). Basic and Applied Aspects of Seeds. Proc 5th International Workshop on Seeds. Kluewer; Cohn, M. A.; K. L. Jones; L. A. Chiles; D. F. Church. 1989. Seed dormancy in red rice. Vll. Structure-activity studies of germination stimulants. Plant Physiol 89:879 - 882).
  5. First report of highly specific chemical structure requirements for dormancy-breaking chemicals (Cohn, M. A.; D. F. Church; J. Ranken; V. Sanchez. 1991. Hydroxyl group position governs activity of dormancy-breaking chemicals. Plant Physiol S-96:63;
  6. Cohn, M. A. 1993. Chemical structure versus physiological activity: studies of dormancy-breaking chemicals for seeds. SEARCH 28:1 - 6).
  7. First report of low-moisture content inhibition of dry-afterripening (Leopold, A. C.; R. Glenister; M. A. Cohn. 1988. Relationship between water content and afterripening in red rice. Physiol Plant 74:659 - 662).
  8. First successful demonstration of application of a dormancy-breaking chemical (nitrogen oxides) to unimbibed seeds (Cohn, M. A.; L. Castle. 1984. Dormancy in red rice. IV. Response of unimbibed and imbibing seeds to nitrogen dioxide. Physiol Plant 60:552 - 556).
  9. Discovered a new class of dormancy-breaking chemicals: monocarboxylic acids (Cohn, M. A.; L. A. Chiles; J. A. Hughes; K. J. Boullion. 1987. Seed dormancy in red rice. Vl. Monocarboxylic acids: a new class of pH-dependent germination stimulants. Plant Physiol 84:716 - 719).
  10. First report of chemical lipophilicity, nature of functional groups, or molecular size controlling the efficacy of dormancy-breaking chemicals (Cohn, M. A.; K. L. Jones; L. A. Chiles; D. F. Church. 1989. Seed dormancy in red rice. Vll. Structure-activity studies of germination stimulants. Plant Physiol 89:879 - 882).
  11. First reports of general principal of pH dependence for dormancy-breaking chemicals which are weak acids or bases (Cohn, M. A.; D. L. Butera; J. A. Hughes. 1983. Seed dormancy in red rice. III. Response to nitrite, nitrate, and ammonium ions. Plant Physiol 73:381 - 384; Cohn, M. A.; J. A. Hughes. 1986. Seed dormancy in red rice. V. Response to azide, cyanide, and hydroxylamine. Plant Physiol 80:531 - 533; Cohn, M. A.; L. A. Chiles; J. A. Hughes; K. J. Boullion. 1987. Seed dormancy in red rice. Vl. Monocarboxylic acids: a new class of pH-dependent germination stimulants. Plant Physiol 84:716 - 719).
  12. First report of long-term red rice seed survival under flooded conditions in the absence of soil under laboratory conditions (Cohn, M. A.; J. Hughes; D. Butera.1984. Dormancy and viability of red rice during maturation and storage. Plant Physiol S-75:68).

Teaching Experience:
PLHL/BIOS 4444. Seed Physiology. An integrated molecular/genetic, biochemical and physiological approach to germination, dormancy, vigor and viability, as well as recalcitrance and seed development.

PLHL 7067. Professional Development for Plant Scientists. An introduction to applications of the scientific method, navigating and evaluating the scientific literature, manuscript & grant preparation, preparing for oral presentations and exams, philosophy of graduate teaching and mentoring .

PLHL/BIOS 7061. Plant Growth & Development. 2 - 3 weeks of guest lectures about seed biology.



Miscellaneous Professional Activities:
Dr. Cohn received his Ph.D. from Cornell University in 1977 under the guidance of Dr. Ralph Obendorf and has devoted over a quarter century to seed physiology research. He has served as Associate Editor of Crop Science and a scientific reviewer for numerous other journals and grant panels. Dr. Cohn is the Editor of Seed Science Research, the premier international journal devoted to basic seed biology. He is a regular participant at the International Seed Biology and Plant Dormancy Workshops and is a member of the W-168 Regional Research Project, Seed Quality Investigations. He has authored or co-authored 55 research papers and book chapters, as well as 48 scientific abstracts. He has been an invited symposium speaker at the International Weed Science Congress, Weed Science Society of America national and regional meetings, as well as International Seed Science Society meetings and recently presented the keynote address at the 3rd International Plant Dormancy Workshop in the Netherlands. He has been an invited speaker at 40 universities and symposia worldwide.

Dr. Cohn has been a member of the Executive Committee of the American Society of Plant Physiologists-Southern Division since 1988 and an emeritus member of the parent society's Executive Committee. He received the ASPP-Southern Distinguished Service Award in 2001. He was the co-recipient of the LSU College of Agriculture Distinguished Dissertation Award for his work with Steve Footitt in 1993. Dr. Cohn is a member of the Weed Science Society of America, Crop Science Society of America, American Society of Official Seed Analysts, a life member of the American Society of Plant Biologists and a charter member of the International Seed Science Society.


Former students of Dr. Cohn have published their own work in EMBO Journal, The Plant Cell, and the Proceedings of the National Academy of Sciences (USA).

Dr. Cohn is a life-long jazz aficionado, has guest lectured in the Jazz History course at LSU, and was a volunteer jazz broadcaster for more than a quarter of a century. He is an accomplished French chef and dedicated servant of his cat.

B.A. in Biology, Northeastern University, Boston
M.S. in Plant Physiology, Cornell University
Ph.D. in Plant Physiology, Cornell University

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