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首页> 外文期刊>American Journal of Experimental Agriculture >Gene Pyramiding Improved Resistance to Angular Leaf Spot in Common Bean
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Gene Pyramiding Improved Resistance to Angular Leaf Spot in Common Bean

机译：基因金字塔提高了对菜豆角叶斑病的抵抗力

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Aims: The study was conducted to determine the effectiveness of pyramided genes in improving angular leaf spot (ALS) resistance in susceptible common bean cultivars. Study Design: The experiment was set in randomized block design with three replications. Place and Duration of Study: The experiment was conducted at International Centre for Tropical Agriculture (CIAT) at Kawanda, Uganda in 2010-2014. Methodology: Crosses among three Pseudocercospora griseola resistant lines of common bean ( Phaseolus vulgaris ) were developed. The crosses involved five inbred lines, AND277, Mexico 54, G5686 and two susceptible cultivars, K132 and Kanyebwa. The resistant lines were crossed in cascading pyramiding scheme to develop triple crosses (TC). The TC F1 and each of the resistant parents were crossed with each of the two susceptible cultivars to generate four parent crosses (FPC) and single crosses (SC), respectively. All the population developed was inoculated with 61:63 P. griseola isolate under screenhouse conditions and their reaction was elucidated. Results: The SC exhibited resistance segregation ratios of 15:1 and 61:3 while TC best fitted for 249:7 and 247:9 ratios. This suggested that two or three genes were present in SC and four genes in the TC. The resistance present in the three sources to ALS race 61:63 is complex; with epistatic mode of inheritance. The four genes in FPC provided more effective resistance against isolate 61:63 than two or three genes in SC. Conclusion: The FPC lines with combined resistance were more effective than the individual sources for transferring resistance to susceptible cultivars. Future studies needs to be conducted to determine how broad and effective combined resistances in these newly developed lines have against the variability of the ALS pathogen sampled in Uganda.
机译：目的：进行这项研究以确定金字塔型基因在改善易感普通豆品种的角叶斑病（ALS）抗性方面的有效性。研究设计：实验设置为具有三个重复的随机区组设计。研究的地点和持续时间：该实验于2010-2014年在乌干达卡瓦达国际热带农业中心（CIAT）进行。方法：开发了三个普通豆（菜豆）抗性品系之间的杂交。杂交涉及五个自交系，AND277，墨西哥54，G5686和两个易感品种，K132和Kanyebwa。在级联金字塔方案中交叉抗性株系以形成三叉杂交（TC）。 TC F 1 和每个抗性亲本分别与两个易感品种杂交，分别产生四个亲本杂交（FPC）和单亲杂交（SC）。在筛选条件下，所有发育的人群均接种了61:63的灰霉菌隔离菌株，并阐明了它们的反应。结果：SC的电阻偏析比为15：1和61：3，而TC最适合249：7和247：9。这表明SC中存在两个或三个基因，TC中存在四个基因。这三种来源对ALS种族61:63的抵抗都很复杂。具有上位的继承模式。与SC中的两个或三个基因相比，FPC中的四个基因对分离株61:63的抗性更高。结论：具有组合抗性的FPC品系比将单个抗性转移到易感品种的效果更好。需要进行进一步的研究，以确定这些新开发的品系对乌干达采样的ALS病原体的变异性具有广泛而有效的综合抗性。

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