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Relationships of Genetic Background Among Pyricularia Species, the Blast Pathogens on Gramineous Plants

禾本科植物稻瘟病菌与稻瘟病菌遗传背景的关系

基本信息

批准号：
02454053
负责人：
KATO Hajime
金额：
$ 4.48万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02454053/
关键词：
Magnaporthe grisea Mating type Mating ability Host range millets

项目摘要

Seeds and Pyricularia strains from Panicum miliaceum (Pm) and Setaria itarica (Si) collected from a mountainous area of Japan were used in order to examine the relationships of differentiation of pathogenicity.l. Host range : Seven tribes of gramineous plants were utilized for inoculation tests. 1) Pm-strain attacked eighteen species among twenty seven. No pathogenicity was found against rice, Si and Eleusine coracana (Ec). No differentiated races were detected to Panicum miliaceum from Japan. 2) Si-strain attacked fourteen species among thirty one. There were races to Setaria itarica from Japan and China and no pathogenicity against rice, Pm and Ec.2. Mating type : Standard isolates of mating types A and a of Ec were crossed with isolates of Pm and Si-strains to decide the mating type. 1) Pm-strain was classified into a-type (26 isoiates out of 39 isolates) and no A-type. 2) Si-strain was six A-type and nine a-type.3. Mating ability : 1) Pm-strain was mated with Ec-strain, but ascospores were incomplete. Pm-strain was not mated with either rice-strain or Si-strain. 2) Si-strain was mated with both rice -strain and wheat-strain and some ascospores were fertile. Laggingchromosomes appeared 27 to 46% in the cross between Si-strain and Ec-strain and 24 to 35% in the cross between Si-strain and wheat-strain.Based on these results, Pyricularia from Pm and Si has differentiated into two strains (forma specialis), though both plants have been raised in the same area.

利用日本山区收集的Panicum miliaceum （Pm）和Setaria itarica （Si）的种子和真菌菌株，研究了两者致病性分化的关系。寄主范围：利用7个禾本科植物族进行接种试验。1) pm菌株侵染了27种植物中的18种。对水稻、稻瘟病菌和coracana Eleusine （Ec）均无致病性。2) si菌株侵染31种中的14种。日本和中国产的日本芥有小种，对水稻、Pm和ec2均无致病性。配种方式：将Ec配种类型A和A的标准分离株与Pm和si分离株进行杂交，确定配种方式。1) 39株pm菌株分为a型（26株），无a型；2) si株为6株a型，9株a型。交配能力：1)pm -菌株与ec -菌株进行了交配，但子囊孢子不完整。pm -品系与水稻品系和si -品系均未交配。2)硅系与水稻品系和小麦品系均可交配，部分子囊孢子可育。si -品系与ec -品系杂交的滞后染色体比例为27% ~ 46%，si -品系与小麦品系杂交的滞后染色体比例为24% ~ 35%。基于这些结果，来自Pm和Si的稻瘟病菌已经分化为两个品系（特殊形式），尽管这两种植物都是在同一地区种植的。