B deficiency in rape(Brassica Napus L.) is a common micronutrient deficiency phenomenon in field. But the cultivate response to low B varied widely. So it is possible to get ideal B efficient rape cultivars through methods of breeding and molecular biology. To achieve this goal, it is essential to make clear the mechanisms of efficiency. Recently studies showed that pectin content of plant cell wall may be the main factor to determine plant B efficient. In this stud), two B efficient rape cultiva...