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Mitochondrial dna analyses of fertile and sterile maize zea mays plants derived from tissue culture with the texas male sterile cytoplasm


Mitochondrial dna analyses of fertile and sterile maize zea mays plants derived from tissue culture with the texas male sterile cytoplasm



Theoretical and Applied Genetics 62(3): 213-218



ISSN/ISBN: 0040-5752

Maize plants carrying Texas (T) cytoplasm are male-sterile and sensitive to Drechslera maydis race T toxin, whereas plants carrying normal (N) cytoplasm are male-fertile and resistant to the toxin. Some plants regenerated from T cytoplasm tissue cultures exhibit a N cytoplasm-like phenotype with respect to male-fertility and toxin-resistance. Analysis of the high MW mitochondrial DNA (mtDNA) of such regenerants showed that the plants did not contain N cytoplasm mtDNA. However, their mtDNA show sequence differences from each other and from the mtDNA of plants possessing T cytoplasm. No single alteration detected correlates with the change to male-fertility or toxin resistance. Sequence alterations were also evident in high MW mtDNA isolated from a plant regenerated from N cytoplasm callus. No changes in low MW mtDNA molecules were observed in regenerants from N or T cytoplasm callus.

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Accession: 005905446

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Related references

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