Mitochondrial DNA decreases during pollen development in rapeseed (Brassica napus L.), but mitochondrial linear-plasmid-encoded RNA polymerase persists in mature pollen View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2004-12

AUTHORS

H. Sato, C. Saito, H. Handa

ABSTRACT

Mitochondrial DNA in the male reproductive cells of rapeseed (Brassica napus L.) was monitored by fluorescence microscopy of Technovit 7100 resin sections double-stained with 4',6-diamidino-2-phenylindole and 3,3'-dihexyloxacarbocyanine iodide. Mitochondrial DNA progressively decreased during pollen development and disappeared in mature pollen. This result corresponds well with the maternal inheritance of mitochondria in rapeseed determined by previous genetic analyses. To better characterize the mode of inheritance of the mitochondrial linear plasmid in rapeseed, which is transmitted through pollen, we analyzed by indirect immunofluorescence microscopy the expression and localization of ORF6 protein, a putative RNA polymerase encoded by the plasmid. ORF6 protein was expressed in mature pollen and specifically localized in the cytoplasm of sperm cells in the mature pollen. This suggests that the genes encoded by the plasmid DNA are transcribed in the mature pollen by its own RNA polymerase (ORF6 protein) and that the gene expression in the generative cells may be needed for transmission of plasmid DNA through the pollen. More... »

PAGES

179-185

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00709-004-0071-5

DOI

http://dx.doi.org/10.1007/s00709-004-0071-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1005978645

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/15614478


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