The oily stains accompanying the yellowish rings on the leaves and pods of bean plants are some of the symptoms of the disease known as “Halo blight” – highly important in temperate zones like Spain. The seeds are one of the most important sources of transmission of the pathogen, which means the detection of this bacterium in seeds is one of the most efficient control methods. Nevertheless, agricultural engineer Arantza Rico Martínez has shown, in her PhD thesis, that this blight pathogen cannot be detected in Spain using routine techniques for the certification of bean seeds.
Halo blight is the common name for the disease caused by the bacteria Pseudomonas syringae pv. phaseolicola. One of the aims of this PhD was precisely to genetic characterisation of the bacteria in order to make advances in the control of the disease. To this end, 152 diseased beanstalks, obtained from commercial crop fields between 1993 and 2001.
Iñaki Casado Redin | Basque research
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