RESISTANCE AGAINST THE POTATO CYST-NEMATODE GLOBODERA-PALLIDA SYSTEMICALLY INDUCED BY THE RHIZOBACTERIA AGROBACTERIUM-RADIOBACTER (G12) ANDBACILLUS-SPHAERICUS (B43)
K. Haskygunther et al., RESISTANCE AGAINST THE POTATO CYST-NEMATODE GLOBODERA-PALLIDA SYSTEMICALLY INDUCED BY THE RHIZOBACTERIA AGROBACTERIUM-RADIOBACTER (G12) ANDBACILLUS-SPHAERICUS (B43), Fundamental and applied nematology, 21(5), 1998, pp. 511-517
Bacillus sphaericus strain B43 and Agrobacterium radiobacter strain G1
2, selected from the potato rhizosphere, significantly reduced Globode
ra pallida juvenile penetration into potato roots. To better understan
d the basis of antagonism, the mode-of-action of the bacterial antagon
ists was investigated. The ability of the rhizobacteria to stimulate i
nduced systemic resistance against the nematode was demonstrated in sp
lit-root-trials, where the root system of a single potato plant was sp
atially divided into two separate parts. Induced systemic resistance i
n the split root system was caused by live and heat-killed bacterial c
ells of both bacteria strains. Culture filtrates of B43 had the same e
ffect but G12-culture filtrates did not. Therefore, it was not possibl
e to demonstrate the presence on the leaf surface of a basipetal syste
mic mechanism affecting the root system. (C) Orstom/Elsevier, Paris.