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Cell type determines plastid transmission in tomato intergeneric somatic hybrids
Current Genetics
|August 1, 1992
Summary
In plant somatic hybridizations, mesophyll cell protoplasts preferentially transmit their chloroplast DNA (cpDNA) in Lycopersicon esculentum and Solanum lycopersicoides fusions. This biased transmission is linked to differential plastid multiplication, not initial plastid numbers.
Area of Science:
- Plant Biotechnology
- Somatic Hybridization
- Chloroplast Genetics
Background:
- Understanding chloroplast DNA (cpDNA) transmission is crucial for plant somatic hybridization.
- Parental cell type roles in cpDNA inheritance in intergeneric somatic hybrids remain unclear.
Purpose of the Study:
- To investigate the influence of parental cell types (mesophyll vs. suspension) on cpDNA transmission in somatic hybrid plants.
- To determine factors regulating cpDNA inheritance following protoplast fusion.
Main Methods:
- Fusion of mesophyll (M) and suspension culture (S) derived protoplasts from Lycopersicon esculentum (tomato) and Solanum lycopersicoides.
- Analysis of cpDNA transmission patterns in regenerated somatic hybrid plants (S+M, M+M, S+S combinations).
- Quantification of plastid and proplastid numbers and cpDNA content.
Main Results:
- Mesophyll cpDNA was preferentially transmitted in 96% of S+M and M+S somatic hybrids.
- M+M fusions showed an equitable distribution of cpDNA from both parents.
- Plastid number did not correlate with cpDNA transmission; differential multiplication is implicated.
Conclusions:
- Parental cell type significantly influences cpDNA transmission, with mesophyll cells showing preferential inheritance.
- Differential plastid multiplication, potentially due to unequal nucleoid input, drives biased cpDNA transmission.
- Further research is needed to explain cpDNA inheritance in S+S fusions.