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用来自肯尼亚、马拉维和安哥拉不同咖啡基因型和浆果病菌株进行了下胚轴测验。用肯尼亚和马拉维的菌株对哥伦比亚咖啡品种后代的下胚轴接种，其结果表现出特异的交互效应，这表明了生理小种的存在。
Hypocotyl tests were performed with different coffee genotypes and berry disease strains from Kenya, Malawi and Angola. Inoculation of hypocotyls of offspring of Colombian coffee cultivars with strains from Kenya and Malawi showed specific interaction effects indicating the presence of physiological races.