Expression and inheritance pattern of two foreign genes in petunia

Area of Science:

• Plant Biotechnology
• Molecular Genetics
• Agrobacterium-mediated Transformation

Background:

• Transgenic plants are crucial for crop improvement and functional genomics.
• Understanding gene expression and inheritance is vital for stable trait development.

Purpose of the Study:

• To generate transgenic petunia plants using Agrobacterium-mediated transformation.
• To analyze the phenotypic and molecular expression of NPT II and GUS genes.
• To investigate the inheritance patterns of these transgenes in subsequent generations.

Main Methods:

• Agrobacterium-mediated shoot apex transformation of Petunia hybrida.
• Phenotypic and molecular analysis (Southern hybridization) for gene presence and activity.
• Self-pollination and test crosses to study inheritance patterns.

Main Results:

• Twenty-nine primary transgenic petunia lines were established, showing varied expression of NPT II and GUS genes.
• Both Mendelian and non-Mendelian inheritance patterns were observed for individual genes.
• Poor transmission of foreign genes through pollen was noted, particularly with multiple gene copies.
• No transgenic plant exhibited Mendelian inheritance for both NPT II and GUS genes concurrently.

Conclusions:

• Agrobacterium-mediated transformation can produce transgenic petunias with NPT II and GUS genes.
• Transgene expression and inheritance are complex, influenced by gene copy number and transmission route.
• Achieving stable co-inheritance of multiple transgenes in petunia remains a challenge.