The Male Sterility-associated Pcf Gene and the Normal Atp9-1 Gene in Petunia Are Located on Different Mitochondrial DNA Molecules

Overview

Journal Genetics

Publisher Oxford University Press

Specialty Genetics

Date 1991 Nov 1

PMID 1836443

Citations 12

Authors

O Folkerts

M R Hanson

Affiliations

Soon will be listed here.

Abstract

A mitochondrial DNA (mtDNA) region termed the S-pcf locus has previously been correlated with cytoplasmic male sterility (CMS) in Petunia. In order to understand the relationship of the S-pcf locus to homologous sequences found elsewhere in mtDNAs of both CMS and fertile lines, the structure of the mitochondrial genome of CMS Petunia line 3688 was determined by cosmid walking. The S-pcf locus, which includes the only copies of genes for NADH dehydrogenase subunit 3 (nad3) and small ribosomal subunit protein 12 (rps12) was found to be located on a circular map of 396 kb, while a second almost identical circular map of 407 kb carries the only copies of the genes for 18S and 5S rRNA (rrn18 and rrn5), the only copy of a conserved unidentified gene (orf25), and the only known functional copy of atp9. Three different copies of a recombination repeat were found in six genomic environments, predicting sub-genomic circles of 277, 266 and 130 kb. The ratio of atp9 to S-pcf mtDNA sequences was approximately 1.5 to 1, indicating that sub-genomic molecules carrying these genes differ in abundance. Comparison of the mtDNA organization of the CMS line with that of the master circle of fertile Petunia line 3704 reveals numerous changes in order and orientation of ten different sectors.

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