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D297优63和D297优67是粳粳型D297A不育系,分别与明恢63、明恢67两个不同恢复系配组选育而成的含有粳型血缘的灿稻杂优新组合。当前大面积推广的当家组合汕优63,已有八九年历史,开始表现出抗性减弱,优势降低。不同胞质组合交替轮换种植,不但对避免因组合单一化而造成的毁灭性病
D297 You 63 and D297 You 67 were Japonica-Japonica D297A sterile lines, which were composed of two different restorer lines Minghui63 and Minghui67, respectively. The current large-scale promotion of the combination of Shanyou 63, has 89 years of history, began to show resistance weakened, the advantage is reduced. Alternate rotation of different cytoplasmic combinations of planting, not only to avoid combination of monosomy caused by devastating disease