Botanical Arabidopsis Leaf  SEM

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Research at Dartmouth College, using Arabidopsis thaliana
The following information is from the Biology Department web site and MCB web site .

Molecular Genetics of Metal Uptake:

Metal ions are critical nutrients yet overaccumulation of these same metals can be toxic. Our long-range goal is to define the molecular mechanism of metal ion uptake and its regulation in eukaryotic cells. We are using a combined genetic, molecular, and biochemical approach to examine iron and zinc uptake in the yeast Saccharomyces cerevisiae and the plant Arabidopsis thaliana.

Dr. Guerinot's web page
A complete list of selected publications  can be found at Dr. Guerinot's web page.

Guerinot, M.L. and D. Eide. Zeroing in on zinc uptake in yeast and plants. Current Opin. Plant Biol. 2: 244-249 (1999).

Molecular Genetic Analysis of Plant Circadian Rhythm:

The ability of an organism to measure time is the product of a cellular biological clock. Many phenomena controlled by the biological clock cycle on a daily basis and are called circadian rhythms. My goal is to understand the genetic and biochemical mechanisms by which an organism measures time and uses that temporal information to regulate gene expression and cellular physiology. Plants are richly rhythmic and the circadian clock regulates a number of key metabolic pathways and stress responses. In addition, the circadian clock plays a critical role in the photoperiodic regulation of the transition to flowering in many species.  My lab is taking genetic, molecular biological and biochemical approaches to investigate circadian rhythmicity in the model higher plant species, Arabidopsis thaliana.

 Dr. McClung's Home page
A complete list of selected publications and links to the actual journal articles can be found at Dr. McClung's web site.

McClung, C.R., Salomé, P.A., & T.P. Michael, 2002. The Arabidopsis Circadian System. In: The Arabidopsis Book, eds. C.R. Somerville and E.M. Meyerowitz, American Society of Plant Biologists, Rockville, MD, DOI/10.1199/tab.0044   (add link button)

Michael, T.P., P.A. Salomé, H.J. Yu, T.R. Spencer, E.L. Sharp, J.M. Alonso, J.R. Ecker & C.R. McClung. 2003. Enhanced fitness conferred by naturally occurring variation in the circadian clock. Science 302: 1049-1053.

Michael, T.P., P.A. Salomé & C.R. McClung. 2003. Two Arabidopsis circadian oscillators can be distinguished by differential temperature sensitivity. Proc. Natl. Acad. Sci. USA. 100: 6878-6883.

Langmead, C.J., A.K. Yan, C.R. McClung & B. R. Donald. 2003. Phase-Independent Rhythmic Analysis of Genome-Wide Expression Patterns. J. Comput. Biol. 10:521-536.

Pathway of Ethylene Signal Transduction in Arabidopsis

Plants make use of a diverse group of signaling compounds to regulate growth and development. My laboratory uses a combination of biochemical, molecular, and genetic strategies to analyze signaling pathways in Arabidopsis, in particular the hormone receptors and the initial steps in signal transduction. One of our focuses is on the pathway of ethylene signal transduction.  Ethylene serves as a gaseous hormone in plants and is most widely known for its role in fruit ripening.  A second focus of ours is upon plant two-component signaling systems.  These are evolutionarily ancient signaling systems, common in prokaryotes, which are now known to also play essential roles in plant signal transduction.

Dr. G. Eric Schaller's web page
A complete list of publications can be found at Dr. Schaller's web page.

Zhao, X.-C., X. Qu, D.E. Mathews and G.E. Schaller Effect of ethylene pathway mutations upon expression of the ethylene receptor ETR1 from Arabidopsis. Plant Physiol. 130:1983-1991 (2002).

Schaller, G.E. and J.J. Kieber. Ethylene. in The Arabidopsis Book (Somerville, C., and Meyerowitz, E., eds.) American Society of Plant Biologists. Rockville, MD, DOI/10.1199/tab.0071 (2002).  (add link button)

Gao, Z., Chen, Y.-F., Randlett, M.D., Zhao, X.-C., Findell, J.L., Kieber, J.J., and Schaller, G.E. (2003) Localization of the Raf-like kinase CTR1 to the endoplasmic reticulum of Arabidopsis through participation in ethylene receptor signaling complexes. J. Biol. Chem. 278: 34725-34732

Molecular Genetics of Flower Development in Arabidopsis:

Angiosperm flowers consist of four organ types: sepals, petals, stamens, and carpels. We are interested in understanding the specification of organ identity in flowers of the plant Arabidopsis thaliana.  In particular, we are concentrating our studies on the floral organ identity genes APETALA3 (AP3) and PISTILLATA (PI). In ap3 and pi mutants, the petals are converted into sepals, and the stamens into carpels.  AP3 and PI are members of the MADS transcription factor family.  MADS proteins bind to DNA as dimers.  One project in the lab is focused on genetic and biochemical characterization of components of the AP3/PI pathway.  A second project in the lab is focused on characterization of a moderate-sized gene family in Arabidopsis called the reproductive meristem gene family (REM).  We are utilizing reverse genetics techniques to elucidate the function of REM gene family members.  

 Dr. Jack's Home page

Some recent publications:

Jack, T.  (2001).  Relearning our ABCs: new twists on an old model. Trends in Plant Science 6, 311-316.

Jack, T.  (2002).  New members of the floral organ identity AGAMOUS pathway.   Trends in Plant Science 17, 286-287.

Yang, Y., Fanning, L., and Jack, T.  (2003).  The K domain mediates heterodimerization of the Arabidopsis floral organ identity proteins, APETALA3 and PISTILLATA.  Plant J. 33, 47-60.

Yang, Y., Xiang, H., and Jack, T.  (2003).  pistillata-5, an Arabidopsis floral organ identity mutant with defects in petal development.  Plant J. 33, 177-188.  **Contains SEM images of floral parts

Jack, T.  (2004).  Molecular and genetic mechanisms of floral control.  Plant Cell, special issue on Plant Reproduction (in press).