Colgrove A L, Niblack T L
Department of Crop Sciences, University of Illinois, Urbana, IL 61801.
J Nematol. 2008 Mar;40(1):39-45.
A lack of diversity and durability of resistant soybean varieties complicates management of the soybean cyst nematode (SCN), Heterodera glycines, exemplified by the current overdependence on the PI 88788 source of resistance. Of interest is the effect of adaptation of a SCN population to a source of resistance on its subsequent ability to develop on others. Female indices (FI) from virulence assays (race, HG Type and SCN Type tests) for SCN field populations and inbred lines were analyzed. Female indices on PI 88788, PI 209332 and PI 548316 were highly correlated, as were those of PI 548402, PI 90763, PI 89772 and PI 438489B. Previous studies on resistant SCN-infected soybean roots indicated that the cellular resistance response was similar within these two groups of soybean genotypes. In field populations, highly significant correlations were also found between FI on PI 88788 and PI 548402 and those on PI 89772 and PI 437654. In inbred lines, FI on PI 437654 were correlated with PI 90763 and PI 438489B. To avoid further adaptation, rotation of cultivars with resistance from these groups should be carefully monitored, including those from the most promising source of resistance, PI 437654, such as CystX. In a separate test, 10 soybean varieties developed from CystX were tested against HG Type 0, HG Type 2.5.7 and HG Type 1-7. Female development occurred in all tests but one. Although identification and deployment of unique resistance is needed, management strategies to prevent and detect adaptation should be emphasized.
抗性大豆品种缺乏多样性和持久性，这使得大豆胞囊线虫（SCN，大豆异皮线虫）的管理变得复杂，当前对PI 88788抗性来源的过度依赖就是一个例证。值得关注的是，SCN群体对一种抗性来源的适应性对其随后在其他抗性来源上发育能力的影响。分析了SCN田间群体和自交系毒力测定（小种、HG类型和SCN类型测试）中的雌虫指数（FI）。PI 88788、PI 209332和PI 548316上的雌虫指数高度相关，PI 548402、PI 90763、PI 89772和PI 438489B上的雌虫指数也是如此。先前对抗性SCN感染大豆根的研究表明，这两组大豆基因型内的细胞抗性反应相似。在田间群体中，PI 88788和PI 548402上的FI与PI 89772和PI 437654上的FI之间也发现了高度显著的相关性。在自交系中，PI 437654上的FI与PI 90763和PI 438489B相关。为避免进一步适应，应仔细监测来自这些群体的抗性品种的轮作，包括来自最有前景的抗性来源PI 437654的品种，如CystX。在另一项试验中，对由CystX培育出的10个大豆品种进行了HG类型0、HG类型2.5.7和HG类型1 - 7的测试。除一项试验外，所有试验中均出现了雌虫发育。虽然需要鉴定和利用独特的抗性，但应强调预防和检测适应性的管理策略。
