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从500余个稻瘟病菌单孢菌株中选出在与标准菌株交配时能较多地产生子囊壳及子囊孢子的26个菌株和10个子囊孢子菌株,通过其中A交配型的20个菌株与a交配型的16个菌株相互交配,证明YL90—84、YL90—71等4个分离自西双版纳陆稻上的菌株及子囊孢子菌株A—1具有较高的有性世代形成能。此外,笔者还根据云南省南部稻区的稻瘟病菌多能形成有性世代,并具有较高有性世代形成能,单株培养时能产生子囊壳的事实推论:Pericularia菌是从同宗配合菌演化到异宗配合菌,再演化到失去有性世代形成能而单营无性世代的寄生菌;其寄生性从野生植物、杂粮作物到水稻(或陆稻)的分化可能是在水稻起源地带及其附近完成的,有性机能是在寄生物—寄主的共同演化过程中逐渐丧失的。
From more than 500 isolates of Magnaporthe grisea, 26 strains and 10 ascospore strains that can produce more ascospore and ascospore gene more when mating with standard strains were selected. Among them, 20 strains of mating type A a mating type of 16 strains inter-mating, proving YL90-84, YL90-71 and other four isolates from Xishuangbanna Upland Rice and Ascosporogenous Strain A-1 has a higher sex generation ability. In addition, the author also according to the southern rice province of Yunnan Province, the Magnaporthe oryzae can form a sexual generation, and has a high sexual generation can produce single plant culture can produce ascus shell fact: Pericularia bacteria Evolved into heterosexual mating bacteria, and then evolved to the loss of sexual generation can form a single camp asexual parasites; its parasitic from wild plants, cereals crops to rice (or upland rice) differentiation may be in the rice areas and Completed near, the sexual function is gradually lost in the parasite-host co-evolution process.