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不育系龙特甫变异株有四种类型，矮秆密穗型（Ar）、高秆型（AR）、半育变异型（Af）和迟熟高秆型（fR）。抽穗前温度影响其育性的作用最大，r微效恢复基因的存在也是影响育性的因素。
There are four types of Longtefu mutants of CMS line, Ar, D, Af and fR. The effect of temperature before heading on fertility was greatest, and the presence of r-restorer gene was also a factor affecting fertility.