Protoplast-fusion-derived Solanum cybrids: application and phylogenetic limitations.

Area of Science:

• Plant genetics and breeding
• Somatic hybridization techniques
• Nuclear-cytoplasmic interactions

Background:

• Understanding intrageneric nuclear-organelle compatibility is crucial for potato breeding.
• Introgression of desirable traits via plasmone-coded breeding can enhance crop improvement.
• Somatic hybridization offers a pathway for combining genetic material from different Solanum species.

Purpose of the Study:

• To investigate nuclear-organelle compatibility within the Solanum genus.
• To explore the introgression of plasmone-coded traits into potato (Solanum tuberosum).
• To establish fertile and sterile interspecific Solanum cybrids for breeding applications.

Main Methods:

• Interspecific cybridization using protoplast-fusion between donor and recipient Solanum species.
• Transfer of plastomes and chondriomes from S. chacoense, S. brevidens, and S. etuberosum into S. tuberosum nuclear genomes.
• Regeneration and characterization of resulting cybrid plants.

Main Results:

• Successful transfer of plastomes and chondriomes from donor species into S. tuberosum cybrids.
• S. chacoense organelle transfer resulted in fertile, green potato-like cybrids.
• S. etuberosum organelle transfer yielded male-sterile cybrids with pigmentation abnormalities.
• S. brevidens organelle transfer produced non-viable albino regenerants.

Conclusions:

• Demonstrated feasibility of transferring functional plastomes and chondriomes between Solanum species.
• Established a method for de novo creation of male-sterile potato cybrids.
• Identified potential for utilizing cybrids in developing hybrid true-potato seed varieties.