Mahuku George S, Jara Carlos E, Cajiao César, Beebe S
Centro Internacional de Agricultura Tropical (CIAT), A. A. 6713, Cali, Colombia, South America.
Plant Dis. 2002 Dec;86(12):1383-1387. doi: 10.1094/PDIS.2002.86.12.1383.
Use of genetic resistance is the most practical and economic way to manage anthracnose of common bean. Colletotrichum lindemuthianum, the causal agent of bean anthracnose, is a highly variabile pathogen, and there are no host resistance genes that are effective against all known races of the pathogen. To diversify sources of resistance, we screened the core collection of the secondary gene pool of Phaseolus spp. and interspecific lines derived from simple and complex crosses of primary and secondary genotypes for their resistance to anthracnose. High levels of resistance were observed in the secondary gene pool. None of the 162 accessions tested was susceptible to C. lindemuthianum. Of the two species composing the secondary gene pool, P. polyanthus displayed higher levels of resistance than P. coccineus, and all accessions tested were resistant. The response of P. coccineus was more variable, with six genotypes showing an intermediate reaction. Among the 75 lines from interspecific crosses, 49 were resistant to the three races (races 6, 15, and 3481) used in this study, and higher levels of resistance were found in lines that had P. polyanthus as one of the parents in the crosses than in the lines derived from P. coccineus. These lines constitute a valuable source of resistance and may aid in the development of stable resistance to anthracnose.
利用遗传抗性是防治普通菜豆炭疽病最实用、最经济的方法。菜豆炭疽病的病原菌菜豆炭疽菌是一种高度可变的病原体，目前尚无对该病原体所有已知小种均有效的寄主抗性基因。为了使抗性来源多样化，我们筛选了菜豆属二级基因库的核心种质以及由初级和次级基因型的简单和复杂杂交产生的种间品系对炭疽病的抗性。在二级基因库中观察到了高水平的抗性。所测试的162份种质中没有一份对菜豆炭疽菌敏感。在构成二级基因库的两个物种中，多花菜豆比红花菜豆表现出更高水平的抗性，所有测试种质均具有抗性。红花菜豆的反应更具变异性，有6个基因型表现出中间反应。在75个种间杂交品系中，49个对本研究中使用的三个小种（小种6、15和3481）具有抗性，并且在杂交中以多花菜豆作为亲本之一的品系中发现了比源自红花菜豆的品系更高水平的抗性。这些品系构成了宝贵的抗性来源，可能有助于培育对炭疽病的稳定抗性。
