Biochemical and Symbiotic Properties of the Rhizobia 1

Abstract

Few groups of bacteria have been so thoroughly studied as have the rhizobia.

Physiological and biochemical characteristics of fast‐and slow‐growing Rhizobium sp. pigeonpea (Cajanus cajan)

“…Rhizobium strains are able to form nitrogen-fixing symbioses with more than 1100 species of leguminous plants and exhibit specificity in association with their host plants (Vincent 1974). Metabolically, Rhizobium can be split into two broad groups: rapid and slow growers (Allen & Allen 1950). Rhizobia isolated from legumes of temperate region, e.g.…”

THE RHIZOBIUM REQUIREMENTS OF THE NON‐LEGUME PARASPONIA IN RELATIONSHIP TO THE CROSS‐INOCULATION GROUP CONCEPT OF LEGUMES

“…The bacteria isolated from nodules on P. parviflora and P. rigida and the previously studied species P. andersonii (Trinick, 1980) and P. rugosa (Trinick, 1976) are morphologically, nutritionally, culturally and serologically similar to slow-growing rhizobia (Trinick, 1976). Allen and Allen (1950) pointed out that the sole criterion for the recognition of the genus Rhizobium is the ability to invade the roots of leguminous plants and stimulate nodule production. From observations on the host specificity of Rhizobium, Fred, Baldwin and McKoy (1932) proposed the concept of cross-inoculation groups.…”

Control of Specificity in Legume‐Rhizobium Associations

“…Common fungi like Aspergillus (Robinson 1946) and Fusarium (Dorn 1956) and bacteria including Bacillus and Streptomyces sp. may be active antagonists (Allen & Allen 1950;Hely et al 1957;Wieringa 1963;van Schreven 1964) although rhizobia differ widely in their susceptibility to antibiotics (Graham 1 9 6 3~; Schwinghamer 1964;Pattison & Skinner 1974;. There are also reports of stimulation of rhizobia by various soil organisms (Krasilnikov 1958: Vincent 1962.…”