Biological N2 fixation represents the major source of N input in agricultural soils including
those in arid regions. The major N2-fixing systems are the symbiotic systems, which can play …

In eukaryotic cells, variations in the levels of cytosolic free calcium regulate processes as
important and disparate as chemotaxis, chromosome segregation, fertilization, ion transport …

The present review gives a critical assessment of the literature dealing with symbiosis
between rhizobia and legumes and between AM fungi and most plants. Associative N2 …

Inoculation of legumes under field conditions with superior nitrogen-fixing rhizobia does not
always result in the desired yield increase. Often it is observed that the inoculum strain fails …

An acid-sensitive mutant TG5-46, derived from Rhizobium meliloti WSM419 by Tn5
mutagenesis, fails to grow below pH 6.0 whereas the parent strain grows at pH 5.7. The …

We describe the isolation and characterization of alfalfa-nodulating rhizobia from acid soils
of different locations in Central Argentina and Uruguay. A collection of 465 isolates was …

The family Rhizobiaceae is comprised of six genera of plant-associating bacteria,
Rhizobium, Bradyrhizobium, Sinorhizobium, Azorhizobium, Agrobacterium, and …

Publisher Summary This chapter reviews the ways microorganisms respond to pH stress
focusing primarily on molecular aspects of adaptation in bacteria. The requirement for co …

Summary Two 'calcium‐irreparable'acid‐sensitive mutants were identified after
mutagenizing Rhizobium leguminosarum bv. viciae and Sinorhizobium meliloti with Tn5 …

Changes in various cell functions were examined during a shift of the cyanobacterium
Anabaena sp. strain PCC7120 to acidic external pH (pHex) in the presence and absence of …