Highlights of Nitrogen Fixation Research

1. Bacteriocins of Rhizobium Leguminosarum

   • Sunny Twelker, Ivan J. Oresnik, Michael F. Hynes

   Pages 105-108

2. Suppression of Plant Defence in the Medicago Sativa (Alfalfa)-Sinorhizobium meliloti Symbiosis

   • Karsten Niehaus, Anke Becker, Alfred Pühler

   Pages 109-113

3. Unique Aspects of Nod Gene Expression in Bradyrhizobium Japonicum

   • J. Loh, J. P.-Y. Yuen, M. G. Stacey, G. Stacey

   Pages 115-120

4. Control of Root Nodule Initiation in Medicago

   • A. Kondorosi, M. Crespi, C. Charon, C. Sousa, C. Johansson, C. Sautter et al.

   Pages 121-124

5. Differential Expression of Symbiosis-Related Genes in Yellow Lupine

   • M. M. Sikorski, T. Stepkowski, A. Swiderska, J. Biesiadka, B. Łotocka, J. Kopcinska et al.

   Pages 125-129

6. An Isoflavone from Soybean Roots Induces Sinorhizobium Fredii Strain USDA257 to Produce Pilus-Like Surface Appendages

   • Steven G. Pueppke, Margreet DeBoer, Xiao-Tong He, Hari B. Krishnan

   Pages 131-134

7. Rhizobium Etli (RE) Lipopolysaccharide (LPS) Structure

   • R. W. Carlson, E. L. Kannenberg, L. S. Forsberg, S. Xie

   Pages 135-140

8. Two Different Signal Peptidases and Their Possible Roles in the Biphasic Life Cycle of Bradyrhizobium Japonicum

   • Peter Müller, Andrea Bairl, Till Winzer

   Pages 141-144

9. Xylem Colonization of Sesbania Rostrata by Azorhizobium Caulinodans ORS571

   • K. J. O’Callaghan, M. R. Davey, E. C. Cocking

   Pages 145-147

10. Extracellular Calcium Flux in Root Hairs Responding to Nodulation Factors

    • L. Cárdenas, J. Feijó, J. G. Kunkel, L. Vidali, J. Domínguez, F Sánchez et al.

    Pages 149-152

11. Use of T Dna Tagging to Identify Plant Genes Involved in Symbiotic Nitrogen Fixation

    • Leif Skøt, K. Judith Webb, Margaret M. Nicholson, Bodil Jørgensen, Sue Mizen

    Pages 153-156

12. Physical and Gentic Organisation of pNGR234a

    • X. Perret, C. Freiberg, A. Rosenthal, W. J. Broughton

    Pages 157-161

13. The Symbiotic Plasmid of Rhizobium Etli

    • J. G. Dávila, P. Bustos, M. A. Cevallos, M. L. Girard, R. Palacios, O. Rodríguez

    Pages 163-165

14. The Dynamic Genome of Rhizobium

    • D. Romero, J. Martínez-Salazar, R. Palacios, C. Rodríguez, E. Valencia-Morales

    Pages 167-171

15. Functional Genomics of Legumes

    • P. M. Gresshoff, J. Stiller, A. Men, S. Radutoiu, S. Pillai, D. Landau-Ellis et al.

    Pages 173-176

16. Cloning Defined Regions of the pExo Megaplasmid of Rhizobium (Sinorhizobium) Meliloti

    • Patrick S. G. Chain, Ismael Hernández-Lucas, Brian Golding, Turlough M. Finan

    Pages 177-179

17. Cloning and Identification of Mobilizable DNA Regions in Rhizobium Meliloti

    • José A. Herrera-Cervera, Julio M. Sanjuan-Pinilla, José Olivares, Juan Sanjuan

    Pages 181-183

18. Heterocyst Differentiation and Nitrogen Fixation in the Cyanobacterium Anabaena

    • R. Haselkorn, K. Jones, W. J. Buikema

    Pages 185-188

19. Integration of Regulatory Networks for Different Physiological Functions in Bradyrhizobium Japonicum

    • H. M. Fischer, E. Bauer, R. Emmerich, A. Minder, F. Narberhaus, S. Schaeren et al.

    Pages 189-193

20. Mode of Action of the FixT Repressor Protein of Sinorhizobium Meliloti

    • Anne-Marie Garnerone, Marie Foussard, Pierre Boistard, Jacques Batut

    Pages 195-199

For 31 years, the North American Symbiotic Nitrogen Fixation Conference (for­ merly Rhizobium Conference) has been a forum for scientists and graduate students to discuss their research advances, extending from basic aspects to agricultural appli­ cations, and dealing with topics ranging from bacterial genetics and metabolism to plant genetics and physiology. Nitrogen fixation, being a major life-supporting process on this planet, has attracted the interest of researchers for more than one century. Nitrogen fixation is responsible for the conversion of "inert" dinitrogen (N ) gas from the atmos­ z phere into usable ammonia, replacing the fixed nitrogen constantly being lost to the atmosphere by the denitrification process. Worldwide agricultural productivity is deter­ mined by the availability of fixed nitrogen in all its forms, which the continually increas­ ing human population depends upon for survival. An international momentum is developing in the use of biofertilizers to improve legume and non-legume crop yields and in the study of genomics in this area. New studies are being undertaken in several laboratories to study novel nitrogen-fixing systems, including non-legume crops. The North American Conferences on Symbiotic Nitrogen Fixation have periodically chronicled the advances in our knowledge of this area. For the first time, this conference was held in Mexico. Thus, all three North Amer­ ican countries have been hosts for this event. This year conference brought nearly 200 scientists from 18 different countries presenting lectures and over 80 posters.

• Alanin
• Calcium
• Colon
• Cytosol
• DNA
• Expression
• Glutamin
• Polysaccharid
• Polysaccharide
• Xylem
• genetic engineering
• metabolism
• nitrogen
• physiology
• roots
• Systematic Botany

• Nitrogen Fixation Research Center, National University of Mexico, Cuernavaca, Morelos, México

  Esperanza Martĺnez, Georgina Hernández

Policies and ethics