Mar 1, 1976

Zoospore chemotaxis in Australian isolates of Phytophthora species

Canadian Journal of Microbiology
D M Halsall

Abstract

Zoospores of Australian isolates of Phytophthora drechsleri, P. cryptogea, P. cinnamomi, P. nicotianae var. parasitica, and P. citricola were examined for their chemotactic responses to asparagine, glutamine, aspartate, glutamate, and structurally related compounds. Structural requirements for attraction include the alpha-amino-acid group with a short carbon chain terminating in an amide group. The one American isolate tested gave a different result and possible reasons for this are discussed. The pH of the environment was important, a neutral-charged molecule was more attractive than a negatively charged molecule, hence glutamine and aspartate were more attractive at pH 3.0 than pH 5.0. Zoospores tended to move away from regions with a high hydrogen ion concentration. Compounds other than amino acids were slightly attractive including several sugars and ethanol. Synergistic interactions between amino acids, ethanol, and sucrose were observed and may account for the high levels of attraction of zoospores to root exudates and extracts.

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Mentioned in this Paper

Asparagine
Phytophthora cinnamomi
Ethanol
Pentaleyrodes cinnamomi
Hydrogen Ion Concentration Measurement
Amides
Ethanol Measurement
Aspartic Acid, Magnesium-Potassium (2:1:2) Salt
Aspartate
Amino Acids, I.V. solution additive

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