brazilian peppertree (schinus terebinthifolius) leaf extract was applied against two strains of the crown gall disease agent (agrobacterium tumefaciens); strains c58 and ar125. in vitro, we used the agar well diffusion method and the extract was tested in different solvents selected according to their polarity indices, at different concentrations and different incubation temperatures. in vivo, ...

Crown gall caused by Agrobacterium tumefaciens is the major limiting factor in raising healthy stone fruit plants in nurseries. The incidence of crown gall varies from 4 to 97.5 per cent at different locations resulting in out right rejection of an average of 30 per cent stone fruit plants in nurseries. Agrobacterium radiobacter strain K-84 has been reported to provide nearly complete control o...

G. Guzmán, B.A. Latorre, R. Torres, and W.F. Wilcox. 2007. Relative susceptibility of peach rootstocks to crown gall and Phytophthora root and crown rot in Chile. Cien. Inv. Agr. 34(1):31-40. Crown gall (Agrobacterium tumefaciens) and Phytophthora root and crown rot (PRCR), caused by P. cryptogea, are two major limiting factors affecting peach (Prunus persica) production in Chile. At present, N...

Seventeen samples consisting of purified compounds and various ethanol extracts from plant sources were tested for activity on the initiation of crown gall tumors on potato discs. The results demonstrated definite correlation between the ability of these samples to inhibit the formation of crown gall tumors and their activity on the P388 leukemia system in mice. Samples showing only cytotoxic e...

The habituation of soybean (Glycine max) callus can be induced rapidly, by exposing the tissue to small amounts (10(-9)molar) of compounds including 2.4-dinitrophenol and phenoxyisobutyric acid for brief periods of time. Such compounds reportedly exhibit antiauxin activity. Various soybean callus phenotypes have been isolated which continue to exhibit hormone habituation 14 months following the...