Somatic hybridization in higher plants.

Area of Science:

• Plant Biotechnology
• Somatic Hybridization
• Cell Biology

Background:

• Somatic hybridization techniques have advanced with established methods for protoplast fusion and foreign DNA/organelle uptake.
• Polyethylene glycol (PEG) is an effective agent for inducing protoplast fusion, yielding 5-30% heterospecific fusion products.
• Protoplasts from different plant species, genera, and families demonstrate compatibility during fusion.

Purpose of the Study:

• To investigate the feasibility and outcomes of somatic hybridization in higher plants using protoplast fusion.
• To explore the compatibility of protoplasts from diverse plant taxa for successful fusion and hybrid formation.
• To identify methods for recognizing, isolating, and selecting somatic hybrid cells and potentially developing hybrid plants.

Main Methods:

• Protoplast isolation and fusion induced by Polyethylene glycol (PEG).
• Observation of heterokaryocyte formation, cell division, and callus development.
• Demonstration of nuclear fusion in heterospecific heterokaryons (e.g., soybean + pea, carrot + barley).

Main Results:

• Successful fusion and subsequent cell division/callus formation observed in various protoplast combinations (e.g., soybean + corn, soybean + pea).
• Heterokaryocytes exhibited random mitotic nuclear distribution, multiple wall formation, and chimeral callus development.
• Evidence of heterospecific interphase nuclei fusion confirmed in soybean + pea and carrot + barley heterokaryons.

Conclusions:

• Somatic hybridization via protoplast fusion is a viable method for creating interspecific and intergeneric plant hybrids.
• Selective systems, such as gene complementation, are crucial for isolating and cloning somatic hybrid cells.
• The regeneration of hybrid plants from protoplast fusion products is feasible, as demonstrated in tobacco.