Characteristics of Pollen from Transgenic Lines of Apple Carrying the Exogenous CpTI Gene
Theoretically, single gene insertion has a minor impact on the genome of the recipient, and the recipient should soon
regain genetic stability. However, more and more research has shown that genetic variation occurs in the first generation of transgenic plants or their progeny to some extent, with dwarfing and low fertility being typical phenomena (Fan et al., 2000; Cui et al., 2001; Ren et al., 2006). The phenotypic variation in transgenic plants could be due to the effect of T-DNA insertion
at different loci or the expression of the exogenous gene on the metabolic processes of the recipients (Benedict et al., 1996).