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Utilization of Octopine and Nopaline by Agrobacterium
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Tests for utilization of
d
-octopine and nopaline in defined media containing a carbon and nitrogen source were made on 60 strains of
Agrobacterium
representing four species and on a representative of each of five species of
Rhizobium
. Among 46 virulent strains of
Agrobacterium
, only two strains were found which utilized neither compound, while three strains were found which could utilize both. Of the remaining virulent strains, 27 utilized octopine and 14 utilized nopaline. Each of six strains of
A. rhizogenes
tested utilized only octopine but at a slower rate relative to growth than most
A. tumefaciens
. All eight of the
A. radiobacter
strains failed to utilize either compound, as did four of six nonvirulent strains of
A. tumefaciens
. The rhizobia did not utilize octopine or, with the possible exception of
R. japonicum
, nopaline. Virulence in the genus
Agrobacterium
is concluded to be highly correlated with the ability to utilize one or both of these compounds.
American Society for Microbiology
Title: Utilization of Octopine and Nopaline by
Agrobacterium
Description:
Tests for utilization of
d
-octopine and nopaline in defined media containing a carbon and nitrogen source were made on 60 strains of
Agrobacterium
representing four species and on a representative of each of five species of
Rhizobium
.
Among 46 virulent strains of
Agrobacterium
, only two strains were found which utilized neither compound, while three strains were found which could utilize both.
Of the remaining virulent strains, 27 utilized octopine and 14 utilized nopaline.
Each of six strains of
A.
rhizogenes
tested utilized only octopine but at a slower rate relative to growth than most
A.
tumefaciens
.
All eight of the
A.
radiobacter
strains failed to utilize either compound, as did four of six nonvirulent strains of
A.
tumefaciens
.
The rhizobia did not utilize octopine or, with the possible exception of
R.
japonicum
, nopaline.
Virulence in the genus
Agrobacterium
is concluded to be highly correlated with the ability to utilize one or both of these compounds.
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