There are three main CMS types in maize: T, C and S. The S type of CMS (CMS-S) is a gametic sterility type, and its poll玉米主要有T、C、S三种CMS类型，其中S型CMS属于配子体雄性不育，其花粉的败育被认为与线粒体基因组内R区的表达相关。