‘Yongxue No.4’ is a new leaf-edible mustard F₁ hybird developed by crossing cytoplasmic male
sterile line‘ 07-50A’ as female parent and inbred line‘ 07-10’ as male parent．Its growing period is about 105
days from sowing to harvest．The plant is of opened type．It has strong growth vigor．Its leaf is light green in color
with double serrate and shallow sawtooth．The average effective tiller number is 27．The single fruit weight is 1.4
kg．It can yield about 75 t·hm^-2．It has good yielding ability．It is resistant to virus disease．After processing，
it is yellow and bright in color with good quality．It is suitable to be cultivated in the Yangtze River valley in
spring，autumn and winter．