云南野生稻对稻瘟病的抗性评价

 以Tetep、B40为抗、感对照品种,在湖南省烟溪病区病圃,采用自然诱发,鉴定云南普通野生稻(Oryza rufipogon Griff.)、疣粒野生稻(Oryza meyeriana Baill.)、药用野生稻(Oryza officinalis Wall.)以及小粒野生稻对稻瘟病的抗性。结果表明:药用野生稻发病最早,叶瘟病级严重度达到7级,病斑孢子层级达5级;云南普通野生稻中,景洪普通野生稻病级严重度达7级,病斑孢子层级5级,元江普通野生稻病级严重度达8级,病斑孢子层级7级;疣粒野生稻发病最迟, 病级发展缓慢,病级严重度为3级,病斑孢子层级1级。同田的小粒野生稻高抗稻瘟病。三种云南野生稻对稻瘟病的抗性评价为普通野生稻高感,药用野生稻感,而疣粒野生稻为中抗。

Resistance Assessment of Yunnan Wild Rices to Blast

ln contrast with Tetep (resistant) and B4o(susceptible), the blast resistance of three Yunnan wild rices (oryzaoffcinalis Wall., oryza rufipogon Griff., and oryza meyeriana Baill. ) were identified. The results indicated that o.offcinalis was infected at first,and its leaf blast severities and spore layer scales of lesions at seedIing stage were 7 and 5grade, respectively. Jinhong common wild rice's were 8 and 7 grade, Yuanjiang common wild rice's were 9 and 7, respectively. o. meyeriana was infected late and scattered slowly, and at 3 and l grade, respectively. on the other hand, o. minuta resisted the blast in the same field. Thus,the blast resistance types of Yunnan wild rices were assessed as follow: o. rufipogonhighly susceptible ; o. officinalis susceptible, and o. meyeriana moderately resistant.