Efficient and heritable transformation of Phalaenopsis orchids

Area of Science:

• Plant Biotechnology
• Molecular Biology
• Orchid Genetics

Background:

• Phalaenopsis orchids are economically important floriculture species with unique biological features.
• Limited efficient transformation methods hinder the investigation of these features and their functions.

Purpose of the Study:

• To develop an efficient and heritable Agrobacterium-mediated transformation method for Phalaenopsis orchids.
• To establish a stable transformation system for functional genomics and molecular breeding.

Main Methods:

• Agrobacterium-mediated transformation using protocorms from tetraploid or diploid Phalaenopsis orchids.
• T-DNA vector construct with eGFP reporter gene driven by a ubiquitin promoter.
• Confirmation of gene integration and expression using genomic PCR, Southern blotting, and Western blotting.

Main Results:

• Achieved a transformation rate of 1.2-5.2% with stable integration of HptII and eGFP genes.
• Demonstrated low T-DNA insertion numbers and confirmed eGFP protein expression.
• Transgenic traits, including hygromycin resistance and GFP expression, were successfully transmitted to BC1 progenies.

Conclusions:

• A stable and efficient transformation system for Phalaenopsis orchids has been established.
• This protocol facilitates functional genomics research and molecular breeding in Phalaenopsis orchids.