Molecular characterization of the transgenic plants
The two transgenic lines R3 and R5 together with the non-transformed plants were identified by PCR, Southern hybridization and RT-PCR analyses,respectively. The experiments were repeated for other 2 times. The two transgenic lines gave positive results in PCR (Fig. 5-A), Southern hybridization (Fig. 5-B) and RT-PCR (Fig. 5-C). These results indicated that the AmGS gene has integrated into the genomic DNA sequence of the transgenic Photinia serrulata plants and expressed at least in transcriptional level.
In order to know the differential expression of the AmGS gene in different tissues of the transgenic Photinia serrulata plants, RT-PCR analysis was carried out with materials from roots, stems and leaves. Results indicated that the AmGS gene expressed in roots, stems and leaves. The expression in leaves and stems is much stranger than that in roots ( Fig. 6).