Efficacy of Pyramiding Greenbug (Homoptera: Aphididae) Resistance Genes in Wheat
Efficacy of Pyramiding Greenbug (Homoptera: Aphididae) Resistance Genes in Wheat
复制标题
小麦中金字塔绿虫（同翅目：蚜科）抗性基因的功效
DOI：
10.1603/0022-0493-93.4.1315
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
J. A. Webster
中科院分区：
文献类型：
--
作者：
D. Porter;J. Burd;K. Shufran;J. A. Webster
摘要小麦对麦二叉蚜（Schizaphis graminum）的持久抗性是小麦改良团队的目标，也是一个因经常发生破坏性生物型而复杂化的目标。模拟建模研究表明，抗除草剂基因，即，在单个栽培品种或杂交种中组合一个以上的抗性基因，可以提供比单个基因的顺序释放更持久的抗性。我们通过鉴定小麦中的抗性基因和测试一系列绿蝽生物型来检验这一理论。测试了抗性基因Gb 2、Gb 3和Gb 6以及经修饰的基因Gb 2/Gb 3、Gb 2/Gb 6和Gb 3/Gb 6对生物型E、F、G、H和I的有效性。通过比较具有单抗性基因的植物与具有单抗性基因的植物的反应，我们发现，单抗性基因所赋予的单抗性基因没有提供额外的保护。基于该测试的结果，我们得出结论，单个抗性基因的顺序释放，结合对绿虫种群生物型的仔细监测，是小麦中绿虫抗性的最有效的基因部署策略。
Abstract Durable resistance to greenbug, Schizaphis graminum (Rondani), in wheat is a goal of wheat improvement teams, and one that has been complicated by the regular occurrence of damaging biotypes. Simulation modeling studies suggest that pyramiding resistance genes, i.e., combining more than one resistance gene in a single cultivar or hybrid, may provide more durable resistance than sequential releases of single genes. We examined this theory by pyramiding resistance genes in wheat and testing a series of greenbug biotypes. Resistance genes Gb2, Gb3, and Gb6, and pyramided genes Gb2/Gb3, Gb2/Gb6, and Gb3/Gb6 were tested for effectiveness against biotypes E, F, G, H, and I. By comparing reactions of plants with pyramided genes to those with single resistance genes, we found that pyramiding provided no additional protection over that conferred by the single resistance genes. Based on the results of this test, we concluded that the sequential release of single resistance genes, combined with careful monitoring of greenbug population biotypes, is the most effective gene deployment strategy for greenbug resistance in wheat.