Sources of resistance to Pseudomonas syringae pv phaseolicola races in Phaseolus vulgaris
Sources of resistance to Pseudomonas syringae pv phaseolicola races in Phaseolus vulgaris
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DOI：
10.1046/j.1365-3059.1996.d01-148.x
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发表时间：
1996-06-01
期刊：
影响因子：
2.7
通讯作者：
Davis, JHC
中科院分区：
文献类型：
--
作者：
Taylor, JD;Teverson, DM;Davis, JHC
对1048份菜豆种质资源进行了抗假单胞菌（Pseudomonaserichingae pv.）菜豆生。这些种质来源于美洲和非洲地区，在这些地区，该病是重要的，包括野生型种质和一些已知的抗性来源。耐药性分为两种类型：定性和定量，定性是种族特异性的。在49.4%的材料中检测到小种特异性抗性基因（R基因），其基因频率如下：R1（10.3%），R2（0.3%），R3（25.0%），R4（35.0%）和R5在不存在特异性R基因的情况下，抗性的定量变化的证据通过感染评分的分布显示，76%的材料表现出最大感病性（4 - 5级），23%表现出中等抗性（2 - 4级），1%表现出高水平的数量抗性（1 - 2级）。最后1%的加入表现出相互作用，这不是种族特异性，这表明他们可能具有种族非特异性电阻。这类材料中有几个可能携带有来自PI 150414的隐性基因。其他加入未知的父母，可能代表新的来源的数量，潜在的种族非特异性，电阻。小种特异性和小种非特异性抗性的结合是建立持久抗性的有效策略。
One thousand and forty-eight Phaseolus bean accessions were evaluated for resistance to six races of Pseudomonas syringae pv. phaseolicola. The accessions originated from regions of the Americas and Africa where the disease is important and included wild type accessions and some known resistance sources. Resistance, graded on a five-point scale, was of two types: qualitative, which was shown to be race-specific, and quantitative. Race specific resistance genes (R-genes) were detected in 49.4% of accessions with the following gene frequencies: R1 (10.3%), R2 (0.3%), R3 (25.0%), R4 (35.0%) and R5 (0.2%).Evidence for quantitative variation in resistance, in the absence of specific R-genes, was shown by the distribution of infection scores, 76% of accessions showing maximum susceptibility (grades 4-5), 23% showing intermediate resistance (grades 2-4), and 1% showing high levels of quantitative resistance (grades 1-2). The last 1% of accessions showed interactions which were not race-specific and it is suggested that they may possess race non-specific resistance. It is possible that several of the accessions in this category carry the recessive gene derived from PI 150414. Other accessions were of unknown parentage and may represent new sources of quantitative, potentially race non-specific, resistance. It is suggested that the combination of race specific and race non-specific resistance could provide an effective strategy for establishing durable resistance.