Kyle D E, Nickell C D, Nelson R L, Pedersen W L
Graduate Research Fellow.
Professor of Plant Breeding.
Plant Dis. 1998 May;82(5):555-559. doi: 10.1094/PDIS.1998.82.5.555.
Phytophthora rot, caused by Phytophthora sojae, is a damaging disease of soybean (Glycine max (L.) Merr.) throughout the soybean-producing regions of the world. The discovery of new sources of resistance in soybean is vital in maintaining control of Phytophthora rot, because races of the pathogen have been discovered that can attack cultivars with commonly used resistance genes. The objectives of this study were to investigate the distribution and diversity of Phytophthora-resistant soybean in southern China and identify sources that confer resistance to multiple races for implementation into breeding programs. Soybean accessions obtained from southern China were evaluated for their response to races 1, 3, 4, 5, 7, 10, 12, 17, 20, and 25 of P. sojae using the hypocotyl inoculation technique in the greenhouse at Urbana, Illinois in 1996 and 1997. Accessions were identified that confer resistant responses to multiple races of the pathogen. These accessions may provide sources of resistance for control of Phytophthora rot of soybean in the future. The majority of the accessions with resistance to eight or more of the ten races tested were from the provinces of Hubei, Jiangsu, and Sichuan in southern China. Based on the evaluated accessions, these provinces appear to be valuable sources of Phytophthora-resistant soybean.
由大豆疫霉引起的疫霉根腐病是一种在世界大豆产区对大豆（Glycine max (L.) Merr.）具有破坏性的病害。在大豆中发现新的抗性来源对于持续控制疫霉根腐病至关重要，因为已发现该病原菌的一些生理小种能够侵染具有常用抗性基因的品种。本研究的目的是调查中国南方抗大豆疫霉大豆的分布和多样性，并鉴定对多个生理小种具有抗性的资源，以便应用于育种计划。1996年和1997年，利用下胚轴接种技术，在伊利诺伊州厄巴纳的温室中，对从中国南方获得的大豆种质进行了对大豆疫霉1、3、4、5、7、10、12、17、20和25号生理小种的抗性评价。鉴定出了对该病原菌多个生理小种表现出抗性反应的种质。这些种质可能为未来控制大豆疫霉根腐病提供抗性来源。对所测试的十个生理小种中的八个或更多小种具有抗性的种质大部分来自中国南方的湖北、江苏和四川等省份。基于所评价的种质，这些省份似乎是抗大豆疫霉大豆的宝贵来源。
