Novel vector and method of constructing transformant plant using the vector

A vector which comprises the following constitutional units A and B positioned on the same DNA molecule or on different DNA molecules, respectively, said vector comprising:

• a promoter, as Promoter 1, which shows its activity in at least a callus and a plant tissue where a desired gene should be expressed,
• a promoter, as Promoter 2, which shows its activity in at least a callus, and
• a promoter, as Promoter 3, which shows its activity in at least a plant tissue where Promoter 1 and Promoter 2 do not show their activities,
• A:
• a DNA sequence comprising Promoter 1, an expression inhibitory sequence and a desired gene in which expression is accelerated by Promoter 1 and expression is inhibited by the expression inhibitory sequence;
• B:
• a DNA sequence comprising Promoter 2, an expression inhibitory gene in which expression is accelerated by Promoter 2 to exert function of expression inhibition by the expression inhibitory sequence, Promoter 3, the expression inhibitory sequence, and a gene of a removal reaction-catalyzing enzyme in which expression is accelerated by Promoter 3 and expression is inhibited by the expression inhibitory sequence, wherein the DNA sequence is removed by expression of the gene of a removal reaction-catalyzing enzyme.