Dispersal of rice sheath blight fungus,Rhizoctonia solani AG-1(IA), and subsequent disease development in paddy fields, from survey of vegetative compatibility groups |
| |
Authors: | Kimiharu Inagaki |
| |
Institution: | (1) Faculty of Agriculture, Meijo University, Shiogamaguchi, 468-8502 Tenpaku, Nagoya, Japan |
| |
Abstract: | The rice sheath blight fungus,Rhizoctonia solani AG-1(IA), was isolated from surface soil and stubble in the pretrans-planting season (early March) and from sheath blight
lesions on plants at the maturing stage (late September) in two paddy fields (TW and TM:8 a). Isolates were classified into
vegetative compatibility groups (VCG) based on the formation of a barrage zone (or interaction zone) at the colony interface
between isolates on paired cultures. In field TW surveyed in 1991 and 1992, 128–142 isolates obtained in the pretransplanting
season and 82–85 isolates from lesions on mature plants were classified into 27–29 and 28–30 VCGs, respectively. Seven to
10 VCGs (26–35%) were common between both samples, and of 30 VCGs from mature plants 12 (40%) survived the winter 1991/1992
and recovered from stubble and/or soil. In field TM in 1992, 111 isolates in the pretransplanting season and 99 from mature
plants were divided into 18 and 14 VCGs, respectively. Seven (39%) out of 18 VCGs in the pretransplanting season were recovered
again from mature plants. Occurence of common VCGs throughout the year indicated that ca. one third of VCGs found in the pretransplanting
season caused sheath blight on rice plants about 6 mo later in the same field. Further, it was shown that about the same rate
of VCGs which had caused disease overwintered on stubble and/or surface soil until the following pretransplanting season. |
| |
Keywords: | dispersal paddy field Rhizoctonia solani AG-1(IA) vegetative compatibility groups |
本文献已被 SpringerLink 等数据库收录! |
|