Miles M R, Pastor-Corrales M A, Hartman G L, Frederick R D
United States Department of Agriculture-Agricultural Research Service (USDA-ARS), National Soybean Research Center, University of Illinois, Urbana 61801.
USDA-ARS, Vegetable Laboratory, Beltsville, MD 20705.
Plant Dis. 2007 Jun;91(6):698-704. doi: 10.1094/PDIS-91-6-0698.
Soybean rust (Phakopsora pachyrhizi) has been reported on common bean (Phaseolus vulgaris) in Asia, South Africa, and the United States. However, there is little information on the interaction of individual isolates of Phakopsora pachyrhizi with common bean germplasm. A set of 16 common bean cultivars with known genes for resistance to Uromyces appendiculatus, the causal agent of common bean rust, three soybean accessions that were sources of the single gene resistance to P. pachyrhizi, and the moderately susceptible soybean 'Ina' were evaluated using seedlings inoculated with six isolates of P. pachyrhizi. Among the common bean cultivars, Aurora, Compuesto Negro Chimaltenango, and Pinto 114, were the most resistant to all six P. pachyrhizi isolates, with lower severity, less sporulation, and consistent reddish-brown (RB) lesions associated with resistance in soybean. A differential response was observed among the common bean cultivars, with a cultivar-isolate interaction for both severity and sporulation levels, as well as the presence or absence of the RB lesion type. This differential response was independent of the known genes that condition resistance to U. appendiculatus, suggesting that resistance to P. pachyrhizi was independent of resistance to U. appendiculatus.
据报道，亚洲、南非和美国的菜豆（Phaseolus vulgaris）上出现了大豆锈病（Phakopsora pachyrhizi）。然而，关于菜豆锈病菌（Phakopsora pachyrhizi）单个分离株与菜豆种质相互作用的信息却很少。使用接种了6个菜豆锈病菌分离株的幼苗，对一组16个具有已知抗菜豆锈病病原菌（Uromyces appendiculatus）基因的菜豆品种、3个作为对菜豆锈病菌单基因抗性来源的大豆种质以及中度感病的大豆品种‘Ina’进行了评估。在菜豆品种中，Aurora、Compuesto Negro Chimaltenango和Pinto 114对所有6个菜豆锈病菌分离株的抗性最强，病害严重程度较低，产孢较少，并且与大豆抗性相关的红棕色（RB）病斑一致。在菜豆品种间观察到了差异反应，在病害严重程度和产孢水平以及RB病斑类型的有无方面存在品种 - 分离株相互作用。这种差异反应与已知的决定对菜豆单胞锈菌抗性的基因无关，这表明对菜豆锈病菌的抗性与对菜豆单胞锈菌的抗性无关。
