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对甘蓝型油菜波里马细胞质雄性不育系９０Ａ的研究表明，在一定的核背景条件下，不育系由于雄蕊不发育，雌蕊柱头在开花前外突，致使花瓣较难展开和推迟脱落，在中断或减少油菜菌核病病菌的传播媒介方面类似无花瓣油菜。该不育系在与保持系两行相间种植的情况下，不育系病株率比保持系至少减少５１．０８％，病情指数至少减少６５．１１％。这种柱头先突型雄性不育系的形态避病性，在油菜Ｆ１杂种生产中可减轻菌核病的为害，稳定制种产量。
Studies on the Cytoplasmic Male Sterile Line 90A in Brassica napus showed that under certain nuclear background conditions, the sterility of the male sterility line was not developed due to the stamen. The pistil stigma protruded before flowering, which made it difficult for the petals to unfold and delayed the detachment. Petal-like rape in the media that interrupts or reduces B. sclerotiorum. The sterile lines were planted with two rows of maintainer lines, the percentage of diseased lines in sterile lines decreased by at least 51.08% and the disease index decreased by at least 65.11%. This stigma first male sterile line of the form of disease-resistant, hybrid F1 can reduce sclerotinia damage, stable seed production.