BioControl (2004) 49, 455-465

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Ninfa M. Rosas-García, Benito Pereyra-Alférez, Katiushka Arévalo Niño, Luis J. Gal'n-Wong and Lilia H. Morales-Ramos (2004)
Novel toxicity of native and HD Bacillus thuringiensis strains against to the sugarcane borer Diatraea saccharalis
BioControl 49 (4), 455-465
Abstract: Diatraea saccharalis (F.) (Lepidoptera: Pyralidae) is a pest that causes great economic losses to sugarcane producers in Mexico. In order to obtain alternatives for control of this pest, several Bacillus thuringiensis strains (native and from the Howard Dulmage collection) were tested. In bioassays, strains HD-133, HD-551, GM-7, GM-10, and GM-34 caused more than 50% mortality with a 50 µg/ml spore-crystal complex concentration, and were selected as toxic strains. The lowest LC50 value corresponded to GM-34 (33.21 µg/ml). Cry1B and cry1C genes were detected by PCR analysis in the toxic strains. HD-133 and GM-10 habored cry1C gene, HD-551 and GM-7 strains harbored cry1B gene, while GM34 strain did not contain cry1B nor cry1C. An additional PCR analysis was performed to detect cry1A-type genes. All the toxic strains habor at least one cry1A-type gene. Immunoblotting revealed that all strains cross-reacted with an antiCry1A, and only the HD-551 gave a positive signal with antiCry1B polyclonal antisera. GM-7 crystal protein showed no cross-reaction with polyclonal Cry1B antiserum. The toxicity of these strains may be related to some member of the Cry1A toxin class.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Lilia H. Morales-Ramos, Ninfa María Rosas-García

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Diatraea saccharalis Sugarcane (Saccharum officinarum) Mexico
Bacillus thuringiensis Cry1A-toxin (entomopathogen) Diatraea saccharalis Mexico
Bacillus thuringiensis Cry1B-toxin (entomopathogen) Diatraea saccharalis Mexico
Bacillus thuringiensis Cry1C-toxin (entomopathogen) Diatraea saccharalis Mexico