Journal
ANNUAL PLANT REVIEWS ONLINE
Volume 2, Issue 2, Pages 619-658Publisher
WILEY
DOI: 10.1002/9781119312994.apr0616
Keywords
chloroplast; cytoplasmic inheritance; gynodioecy; mitochondria; organelles; paternal leakage; plastids; potential biparental inheritance
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Funding
- United States Department of Agriculture -National Institute of Food and Agriculture Award [2014-33522-21826]
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Heteroplasmy occurs when copies of an organellar genome (plastid or mitochondrial) differ from one another either within a cell or among cells within an individual. This phenomenon was first discovered in plastids over 100 years ago, though `heteroplasmy' was not formally defined until decades later. Mitochondrial and plastid heteroplasmy have since been discovered in diverse taxa, including numerous plants, particularly those with the gynodioecious breeding system. Though heteroplasmy can arise through mutations in organellar genomes, biparental inheritance of organelles often generates heteroplasmy. This article is intended to summarise the cytoploid nature of organellar genomes and different aspects ofmitochondrial and plastid heteroplasmy, fromits discovery, to the development of detection methods. We will also discuss the effects of heteroplasmy on individuals, populations, and species, with regard to fitness, cytonuclear interactions, and genome evolution. Finally, we highlight a few research questions which we consider in need of further investigation to understand the prevalence and effects of heteroplasmy in natural settings.
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