Kouji Ishikawa

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We analyzed the avirulence gene AVR-Pita1 in Japanese rice blast isolates to determine how they gain virulence toward rice cultivars containing the Pita resistance gene. An avirulent isolate, OS99-G-7a (G7a), from a Japanese commercial field contained two paralogs of AVR-Pita1, designated as AVR-Pita1(JA) and AVR-Pita1(JB). Analysis of virulent, independent(More)
We collected 247 isolates of Cercospora kikuchii from soybean seeds with typical purple stain symptoms from 15 prefectures in Japan. Of the 247 isolates, 93 were sensitive to thiophanate-methyl, a benzimidazole used to control this soybean disease; the remaining 154 were highly resistant to the fungicide. To examine genetic variability among the population(More)
Azoxystrobin was recently registered in Japan for the control of purple seed stain of soybean caused by Cercospora kikuchii, because the pathogen has developed resistance to thiophanate-methyl. To investigate the effects of these fungicides on the frequency of C. kikuchii strains resistant to thiophanate-methyl and on the genotype structure of the(More)
In 2005, soybean plants with severe mosaic and leaf rugose symptoms were found in Japan. The plants contained flexuous and filamentous virus-like particles with a modal length of 500 nm. Double-stranded RNA analysis revealed a single major band of ~7000 bp. Reverse transcription-PCR for Potyviridae diagnosis generated a 1.5-kbp cDNA fragment, which(More)
Leaf blast suppression in multilines was evaluated based on the number of susceptible lesions observed in a pure stand of susceptible rice cultivar Sasanishiki, and in 1 : 1 and 1 : 3 mixtures of Sasanishiki and a resistant near-isogenic line, Sasanishiki BL4 or BL7, from 1998 to 2001. The number of lesions first observed in fields in the 1 : 1 and 1 : 3(More)
Please note that the next issue of Advance (Vol. 86), which would normally be published in March, 1999, will be delayed until June. We apologize for the delay. Prepaid subscriptions will be extended accordingly. Our cover illustration symbolizes the era of digital TV services in the home, where a wide choice of content, including studio and satellite news(More)
Our cover photographs show the GSM-type MT-30 digital mobile telephone. This lightweight (170g) and compact (135 x 48 x 26mm) unit provides up to two hours of continuous conversation and 120 hours in standby mode using standard batteries, performance that puts it in the top class worldwide.
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