Use of Microspore-Derived Calli As Explants for Biolistic Transformation of Common Wheat.

There are specific advantages of using microspores as explants: (1) A small number of explant donors are required to obtain the desired number of pollen embryoids for genetic transformation and (2) microspores constitute a synchronous mass of haploid cells, which are transformable by various means and convertible to doubled haploids therefore allow production of homozygous genotypes in a single generation. Additionally, it has been demonstrated in wheat and other crops that microspores can be easily induced to produce embryoids and biolistic approach to produce a large number of transformants. In view of these listed advantages, we optimized the use of microspore-derived calli for biolistic transformation of wheat. The procedure takes about 6 months to obtain the viable transformants in the spring wheat background. In the present communication, we demonstrated the use of this method to produce the reduced immunogenicity wheat genotypes.