scholarly journals Alfalfa Root Exudates and Compounds which Promote or Inhibit Induction of Rhizobium meliloti Nodulation Genes

1988 ◽  
Vol 88 (2) ◽  
pp. 396-400 ◽  
Author(s):  
N. Kent Peters ◽  
Sharon R. Long
Keyword(s):  
Root Exudates ◽  
Rhizobium Meliloti ◽  
Nodulation Genes ◽  
Alfalfa Root

Acid-Tolerant Species of Medicago Produce Root Exudates at Low pH Which Induce the Expression of Nodulation Genes in Rhizobium meliloti

1992 ◽  
Vol 19 (3) ◽  
pp. 287 ◽  
Author(s):  
JG Howieson ◽  
AD Robson ◽  
LK Abbott
Keyword(s):  
Root Exudates ◽  
Rhizobium Meliloti ◽  
Acid Stress ◽  
Gene Induction ◽  
Lacz Gene ◽  
Annual Species ◽  
Nodulation Genes ◽  
Tolerant Species ◽  
Acid Tolerant ◽  
Nod Gene Induction

An acid rhizosphere may interfere with the transcription of nodulation genes in Rhizobium spp. by modifying the production of legume root exudates, or the rhizobial response to them. Certain annual species of Medicago (M. murex, M. polymorpha) can nodulate better in acid soils and solutions than other species (M. truncatula, M. littoralis). The mechanisms of this acid tolerance in nodulation are poorly understood. Root exudates collected at pH 5.8 and pH 6.0 from acid-tolerant species of annual medics induced the expression of nodulation genes in Rhizobium meliloti as indicated from a lacZ gene fusion, whereas exudates from acid-sensitive species grown at these pH values displayed decreased induction activity. For the acid-sensitive host, M. truncatula, increasing the Ca concentration from 0.5 to 5.0 mM at pH 5.8 increased the nod-gene induction activity of its exudates, but there was no effect at higher pH. There was no effect of Ca or pH on the nod-gene induction activity of exudates collected from M. murex. These results indicate a likely mechanism underlying differences in ability to nodulate under acid stress among annual species of Medicago.

scholarly journals Interference between Rhizobium meliloti and Rhizobium trifolii nodulation genes: genetic basis of R. meliloti dominance.

1988 ◽  
Vol 170 (12) ◽  
pp. 5718-5727 ◽  
Author(s):  
F Debellé ◽  
F Maillet ◽  
J Vasse ◽  
C Rosenberg ◽  
F de Billy ◽  
...  
Keyword(s):  
Genetic Basis ◽  
Rhizobium Meliloti ◽  
Rhizobium Trifolii ◽  
Nodulation Genes

Invasion of Alfalfa Root Nodules by the Nitrogen-Fixing Bacterium Rhizobium meliloti

2000 ◽  
pp. 235-236
Author(s):  
Gordon R. O. Campbell ◽  
Brett Pellock ◽  
Kristin Le Vier ◽  
Lai-Xi Wang ◽  
Sara M. Bush ◽  
...  
Keyword(s):  
Rhizobium Meliloti ◽  
Root Nodules ◽  
Nitrogen Fixing ◽  
Alfalfa Root

A plant flavone, luteolin, induces expression of Rhizobium meliloti nodulation genes

Science ◽  
1986 ◽  
Vol 233 (4767) ◽  
pp. 977-980 ◽  
Author(s):  
N. Peters ◽  
J. Frost ◽  
S. Long
Keyword(s):  
Rhizobium Meliloti ◽  
Nodulation Genes

Six nodulation genes of nod box locus 4 in Rhizobium meliloti are involved in nodulation signal production: nodM codes for d-glucosamine synthetase

1991 ◽  
Vol 228 (1-2) ◽  
pp. 113-124 ◽  
Author(s):  
Nedelcho Baev ◽  
Gabriella Endre ◽  
György Petrovics ◽  
Zsofia Banfalvi ◽  
Adam Kondorosi
Keyword(s):  
Rhizobium Meliloti ◽  
Nodulation Genes ◽  
Signal Production

scholarly journals Rhizobium meliloti nodulation genes allow Agrobacterium tumefaciens and Escherichia coli to form pseudonodules on alfalfa.

1984 ◽  
Vol 158 (3) ◽  
pp. 1133-1143 ◽  
Author(s):  
A M Hirsch ◽  
K J Wilson ◽  
J D Jones ◽  
M Bang ◽  
V V Walker ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Agrobacterium Tumefaciens ◽  
Rhizobium Meliloti ◽  
Nodulation Genes

Nodulation Genes and Their Regulation in Rhizobium Meliloti

1989 ◽  
pp. 145-151 ◽  
Author(s):  
Sharon R. Long ◽  
Julie Schwedock ◽  
Thomas Egelhoff ◽  
Melanie Yelton ◽  
John Mulligan ◽  
...  
Keyword(s):  
Rhizobium Meliloti ◽  
Nodulation Genes

Interactions Between Rhizobium Meliloti and Rhizobium Trifolii Nodulation Genes: What is the Basis for Dominance by R. Meliloti?

1987 ◽  
pp. 229-231 ◽  
Author(s):  
Roger Innes ◽  
Michael Djordjevic ◽  
Barry Rolfe ◽  
Jean Denarie ◽  
Charles Rosenberg ◽  
...  
Keyword(s):  
Rhizobium Meliloti ◽  
Rhizobium Trifolii ◽  
Nodulation Genes
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