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用专门能恢复 T 组,S 组或 C 组的专效性恢复系分别对 Y 型不育系测交,仅有 T 组的恢复系对 Y 型表现恢复。用玉米小斑病 T 小种的病菌毒素对各组不育系接种,仅 Y 型和 T 型不育系表现感病。一系列自交系对 T型与 Y 型不育系有完全相同的恢保关系。初步确定 Y 型不育系应归类于 T 组,并对 Y 型不育系的来源、不育系的分组问题进行了分析讨论。
Y-type CMS lines were detected with special restorer lines that could restore T, S, or C groups respectively. Only the T-line restorers restored Y-shape. Inoculants were inoculated with each group of germs with pathogen toxin of T spot of corn spot blotch. Only Y and T genotypes were susceptible. A series of inbred lines have exactly the same conservation relationship with T-type and Y-type CMS lines. It was initially determined that Y type CMS should be classified into T group, and the origin of Y type CMS and grouping of CMS were analyzed and discussed.