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1989年春，从大量的“寒青”新品系群体中发现了黄苗植株，经2代自交和选择，育成了由隐性基因控制的带有遗传标记的“黄苗寒青”小白菜新品系。通过在小白菜和十字花科其它作物的优势育种中应用黄苗遗传标记，可以在苗期准确地鉴定杂交种纯度和剔除伪杂种株。
In the spring of 1989, yellow seedling plants were found in a large number of new strains of “chilling green”. After selfing and selection for two generations, a new line of “Huang Miao Han Qing” cabbage with genetic markers controlled by recessive genes was bred. By using the yellow seedling genetic markers in the superior breeding of other Chinese cabbage and cruciferous crops, it is possible to accurately identify the purity of the hybrids at the seedling stage and to eliminate the pseudo-hybrids.