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选用浙麦1号等5个带有Ta_1不育基因的农艺亲本和苏麦3号等15个赤霉病抗源,组建成抗小麦赤霉病轮回选择的基础群体。在对其进行二次表型轮回选择后,通过抗扩展性的改进,群体病穗的感病小穗率降低了9.55％,R和MR抗性级个体的频率分别提高了15.3％和12.8％,同时原群体的株高水平逐步降低,并在一定程度上削弱了株高与抗性间的不良连锁关系。从群体中选择的优良单株育成了120个纯系,经抗性鉴定,获得了23份抗赤霉病品系,其中2个品系的抗性超过了苏麦3号。本文还提出了利用Ta_1不育基因进行抗小麦赤霉病轮回选择育种的程序和方法。
Five Agronomic parents with Ta_1 sterile gene and 15 scab resistance sources such as Sumai No.3 were selected and used as the basic population for the resistance selection of wheat scab. After the second round of phenotypic reincarnation, the susceptible spikelet percentage of diseased panicles decreased by 9.55% and the frequency of R and MR resistant individuals increased by 15.3% and 12.8%, respectively. At the same time, the plant height of the original population gradually decreased, and to a certain extent weakened the bad linkage between plant height and resistance. A total of 120 pure lines were selected from the excellent individuals of the population, and 23 lines were screened for resistance to Fusarium head blight. The resistance of the two lines exceeded that of Sumai 3. This paper also proposed the use of Ta_1 sterile genes for resistance to wheat scab pathogen selection breeding programs and methods.