|Calderon, Claudia -|
|Al-Faifi, Sulieman -|
Submitted to: Plant and Animal Genome Conference
Publication Type: Abstract Only
Publication Acceptance Date: October 10, 2010
Publication Date: December 16, 2010
Citation: Calderon, C., Al-Faifi, S., Havey, M.J. 2010. Fine Mapping of Paternal Sorting of Mitochondria (Psm) in Cucumber [abstract]. Plant and Animal Genome Conference. Paper No. W182. Technical Abstract: Cucumber is unique among plants because its mitochondrial DNA shows paternal transmission, is one of the largest known among all plants, due largely to short repetitive DNA motifs, and recombination among these repeats produces rearranged mitochondrial DNAs associated with strongly mosaic (MSC) phenotypes. We undertook a germplasm screen to identify cucumber accessions which produced relatively large frequencies of wild-type progenies when crossed with MSC plants as the male. We identified a unique nuclear locus (Psm) which controls sorting of wild-type versus MSC mitochondria transmitted by the male gametophyte. A large segregating family was produced and F2 plants were crossed as the female with MSC16. Over 450 testcross families were scored for numbers of wild-type versus MSC progenies and molecular markers, assigning Psm to a 2.7 cM region on chromosome 3. Eventual cloning of Psm should provide unique insights about nuclear-mitochondrial interactions that control the prevalence of specific mitochondrial DNAs.