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利用中国水稻研究所保存的一份籼型紫叶稻（ＣＮ－ｐｌ）分别与正常绿叶籼、粳稻杂交，发现该紫叶稻的叶色遗传具有特异性：即杂种Ｆ１不表现紫色而呈绿色。Ｆ２群体中绿叶与紫叶之比为１３∶３、５５∶９，符合二至三对基因的分离模式。结果表明：一般正常绿叶稻品种均带有该紫叶抑制基因〔Ｉ－ｐｌ（ｔ）〕，用ＣＮ－ｐｌ作母本与几个广亲和品种杂交，Ｆ１表现出明显的杂种优势。ＣＮ－ｐｌ这种遗传特异性用于两系杂交稻制种，在苗期即可根据叶色，有效的鉴别因化学杀雄不彻底或光敏不育系育性不稳产生的假杂种，以保证杂交Ｆ１纯度。
Using a cross of indica-type purple rice (CN-pl) preserved in China National Rice Research Institute and normal green leaf indica rice and japonica hybrid rice, it was found that the leaf color of this purple rice is specific: that is, hybrid F1 does not show purple and green . F2 population of green leaves and purple leaves ratio of 13: 3,55: 9, in line with two to three pairs of gene isolation patterns. The results showed that the normal green leafy rice varieties all contained the purple leaf inhibitor [I-pl (t)], and F1 showed obvious heterosis when CN-pl was used as the female parent to cross with several wide compatibility varieties. CN-pl This genetic specificity for two-line hybrid rice seedlings, according to the leaf color at the seedling stage, the effective identification of chemical maleicide is not complete or photo-sensitive male sterile fertility instability pseudo-hybrids to F1 hybrids to ensure purity.