【摘要】 <正> 玉米小斑病(Helminthos porium maydis)是一个世界性的老病害。我国著名植物病理学家俞大绂先生早在本世纪二十年代,在江苏等地就已观察到此病,并于1933年发表详细的研究报告。但是,在过去几十年中,由于病害发生得不太严重,没有引起人们的重视。 1944年美国得克萨斯州农业试验站从天然杂交的玉米品种金黄六月中发现雄性不育株,后将这种细胞质雄性不育系定名为T型细胞质雄性不育系(以“T”Cms表示)。更多还原

【Abstract】 Further studies were carried out by inoculating seedlings and adult plants of corn inbred line with isolates 77-10 (Race T) and 77-11(Race O) of Helminthosporium maydis in the greenhouse as well as in the field. When 20 lesions of inbred line leaves with T cytoplasm for male sterility were inoculated by Race T and placed in a moist chamber for 6—24 hours, those lesions produced conidiospores. In the same way, when 20 lesions of inbred line leaves with regular (non-sterile) cytoplasm were inoculated by Race T and placed in a moist chamber for 36 —60 hours, these lesions produced conidiospores. The number of conidiospores per lesion was much greater on leaves with T cytoplasm than on those with regular cytoplasm. On the other hand, Race T attacks the ear and husk of corn line with T cytoplasm, but not those with regular cytoplasm. As far as experiment goes, Race T has been verified in 12 provinces but Race O is more widely distributed in 26 provinces of China.更多还原