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在四个小黑麦中鉴定的对叶锈培养菌7434-1-1T小种的遗传抗性,被选作潜在的小麦抗源基因。每个抗性小黑麦分别与感病小黑麦PI429007杂交,根据侵染型(IT)分离对其亲本、F_1、F_2和F_3代进行鉴评,确定各品种的抗性IT基因数及显性。抗性品种相互杂交,对F_2和F_3鉴评以便检测抗性基因的关系。对来自抗×感组合带有感病IT的F_8作出评价,确定长潜伏期基因的存在,因为这是慢锈抗性的一个重要因子。PI429120具有两个独立的不完全显性基因,它们在成株期共同授与(Confer)0;nIT。PI429155具有一个授与12cIT的不完全显性基因。PI429121表现0;1nIT,PI429215表现0;nIT。这些品种中有两个品种各有一个起主效作用的不完全显性基因和一个授与近似感病——中间型IT的加性微效基因。PI429121的微效基因是隐性的,PI429215的微效基因为部分显性。PI429120的基因与其它品种的基因是独立的。PI429215具有一个与PI429121相同的基因,这种微效基因与9个染色体图单位似有连锁关系。四个品种中,除了其抗性IT基因外,每个品种都具有一种数目未确定的长潜伏期部分隐性基因。这四个小黑麦品种无论作为小麦的叶锈抗源,还是作为低IT基因和慢锈抗性定向利用的范例,可能都是有用的。
Genetic resistance to the leaf rust cultivar 7434-1-1T races identified in the four triticeae was selected as a potential wheat resistance gene. Each resistant triticale was crossed with susceptible triticale PI429007, and their parents, F_1, F_2 and F_3 generations were identified according to the infection (IT) Sex. The resistant cultivars hybridized to each other, and the F 2 and F 3 were evaluated in order to examine the relationship of the resistant genes. F_8 from susceptible IT with susceptible IT was evaluated to determine the presence of long latency genes as this is an important factor for slow rust resistance. PI429120 has two independent imperfect dominant genes that co-confer 0 at the adult stage; nIT. PI429155 has an imperfect dominant gene that confers 12cIT. PI429121 performance 0; 1nIT, PI429215 performance 0; nIT. Two of these breeds each have an incompletely dominant gene that plays a major role and an additive microsatellite that confers proximity to susceptible-intermediate IT. The ploidy gene of PI429121 is recessive, and the minor gene of PI429215 is partially dominant. The gene for PI429120 is independent of the other species. PI429215 has the same gene as PI429121, and this minor gene has a linkage to 9 chromosomal units. Of the four cultivars, in addition to their resistant IT genes, each of the cultivars had a number of indeterminate long recessive recessive genes. These four triticale varieties may be useful both as a leaf rust source for wheat and as a paradigm for targeted utilization of low IT genes and slow rust resistance.