Susceptibility to citrus canker caused by <Emphasis Type="Italic">Xanthomonas axonopodis</Emphasis> pv. <Emphasis Type="Italic">citri</Emphasis> depends on the nuclear genome of the host plant |
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Authors: | Hiroshi Shiotani Terutaka Yoshioka Masashi Yamamoto Ryoji Matsumoto |
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Institution: | (1) Kuchinotsu Citrus Research Station, National Institute of Fruit Tree Science, 954 Otsu, Minamishimabara, Nagasaki 859-2501, Japan;(2) National Institute of Fruit Tree Science, Ibaraki, Japan;(3) Faculty of Agriculture, Kagoshima University, Kagoshima, Japan;(4) Faculty of Agriculture, Saga University, Saga, Japan |
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Abstract: | Susceptibility to Xanthomonas
axonopodis pv. citri of a citrus cybrid, in which the nuclear and cytoplasmic genomes were derived from Citrus
sinensis and C. unshiu, respectively, was evaluated. Bacterial growth in the leaves of the cybrid was similar to that in C. sinensis after pin-prick inoculation throughout the experiment, whereas growth was greater than that in C. unshiu from 8 days after inoculation. Lesion expansion and pustules that later developed from the lesions on the cybrid and on C. sinensis also appeared to be greater than those on C. unshiu. The incidence of citrus canker disease caused by the bacteria on the cybrid trees was in the field was equivalent to that
on C. sinensis but was severer than on C. unshiu. These results indicate that the nuclear genome of the cybrid plays a critical role in susceptibility to citrus canker disease.
However, the pathogenicity gene pthA of the bacteria is not likely to be involved in the difference in susceptibility to the bacteria between C. unshiu and C. sinensis because their susceptibility to a pthA-deficient mutant of the bacteria also differs. |
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Keywords: | Xanthomonas axonopodis pv citri Citrus cybrid |
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