沈农TR21快白菜是沈阳农业大学园艺系以两个性状相似的小白口品种自交系间杂交，经连续多代人工接种芜青花叶病毒（TuMV）筛选而有成的定型品种、该品种于1992年10月经省品种审定委员会审定通过。特征特性株高40～50厘米，株幅朋～40厘米，为直筒型品种。菜帮白色，外叶浅绿色 Shennong TR21 fast-growing cabbage is a type of cultivars screened by continuous multi-generational inoculation of TuMV with two traits of crossbreeds from two crossbreds with similar traits in Horticultural Department of Shenyang Agricultural University. In October 1992 by the provincial variety approval committee approved. Characteristics of the plant height of 40 to 50 cm, width Peng ~ 40 cm, straight-type varieties. Vegetables help white, outer leaves light green