DICOTYLEDON TRANSGENIC METHOD FOR INVADING GROWING POINTS OF SEED SPROUTS OR SEEDLING STEMS MINIMALLY AND FULLY

摘要

The present invention is a method of shoot apical meristem transformation for dicot plant via sufficient and micro wounding (SMW). The technical process includes: germinate the seeds in Petri dish or in the nutrient matrix which can be transplanted with the seedling; expose the shoot apical meristem by removing one cotyledon away; make sufficient and micro wounding transformation treatment in vivo to the apical meristem by stabbing and brushing for 2-3 times using the SMW brush having 100-5000 bristles which is 4-20 μm in diameter for each one and 0.5-3 mm in exposed length, and dipped with the Agrobacterium tumefaciens containing binary vector harboring exogenous genes; after co-cultivation, develop the treated objects directly to normal plants in the nutrient matrix and then transplant the matrix and seedling together into pot or field; promote the plant to develop more branches, pods, bolls, fruits, and seeds; harvest the seeds of each branch of individual T₀ plants separately; detect and identify the transformation results in T₁ generation from every T₀ plant. The advantages of the invention are independent of tissue culture, unlimited in genotype, no need to graft, unnecessary to carry resistant marker, high survival rate in transplantation and seedlings recovered rapidly, easy to manipulate and large scale to perform, and applicable to all dicot plants which can set seeds. The transformation efficiencies for cotton and soybean using this method are 50% and 76.5%, respectively.