病害是影响作物高产稳产的重要因素之一。植物抗病基因(R基因)在长期的进化过程中表现出复杂的进化模式。很多研究表明,植物R基因是以基因家族的形式存在,通常成簇排列从而形成复杂结构。经由旁系同源抗病基因间频繁的序列重组和交换的一类抗性基因叫I型R基因,而较少或没 Disease is one of the important factors that affect the high and stable crop yield. The plant disease resistance gene (R gene) shows a complex evolutionary pattern in the long-term evolutionary process. Many studies have shown that plant R genes exist in the form of gene families and are usually arranged in clusters to form complex structures. A class of resistance genes that undergo frequent sequence recombination and exchange between paralogs is called the type I R gene with little or no