The corn is important in the agriculture production,so it seems to be important to carry on the corn heredity breeding and gene improvement in our country. In maize genetic engineering,however, undesirable problems still exist such as genotype-dependence, somaclonal variation of regenerants from long time in vitro culture, phenotypic aberrations such as albinism and reduced fertility.These weaknesses result in big difficulty to the corn seed selection and developments of the good cultivation species. Theref...