Botryosphaeria spp. isolated from apple and several deciduous fruit trees are divided into three groups based on the production of warts on twigs, size of conidia, and nucleotide sequences of nuclear ribosomal DNA ITS regions |
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Authors: | Tadashi Ogata Teruo Sano Yukio Harada |
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Institution: | (1) Fukushima Fruit Tree Experiment Station, Hirano, Iizaka, 960-0231 Fukushima, Japan;(2) Laboratory of Phytopathology, Faculty of Agriculture and Life Science, Hirosaki University, 036-8561 Hirosaki, Japan;(3) Present address: Fukushima Prefecture Agricultural Experiment Station, Wakamiyamae, Tomita, 963-8041 Koriyama, Japan |
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Abstract: | We examined the phytopathological and biological characters ofBotryosphaeria spp. isolated from apples and other deciduous fruit trees, and determined the nucleotide sequences of their rDNA ITS regions.
TheBotryosphaeria isolates from deciduous fruit trees can be divided into three groups based on their production of warts on twigs, size of
the conidia, and nucleotide sequences of rDNA ITS 1, ITS 2 and 5.8S rDNA. Isolates ofBotryosphaeria in ITS group A produced conidia of intermediate size and showed warts on infected twigs prior to the development of ring
rot on fruit. This group was common on deciduous fruit trees in Japan as a causal agent of ring rot and wart bark diseases
of apples and pears; and it appears similar to theB. dothidea from the US that was isolated from apple exhibiting white rot. The ITS group BBotryosphaeria produced small conidia and induced shoot blight without wart development prior to the development of ring rot on fruit. This
group was localized on pear, persimmon, and kiwi fruit in restricted areas of Japan. The ITS group CBotryosphaeria consisted ofB. obtusa, the causal agent of apple black rot in the US, which produced large dark brown conidia. |
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Keywords: | apple Botryosphaeria spp deciduous fruit trees rDNA ITS region |
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