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The Paradox of Self-Fertile Varieties in the Context of Self-Incompatible Genotypes in Olive
Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
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2019 (English)In: Frontiers in Plant Science, ISSN 1664-462X, E-ISSN 1664-462X, Vol. 10, article id 725Article, review/survey (Refereed) Published
Abstract [en]

Olive, representing one of the most important fruit crops of the Mediterranean area, is characterized by a general low fruit yield, due to numerous constraints, including alternate bearing, low flower viability, male-sterility, inter-incompatibility, and self-incompatibility (SI). Early efforts to clarify the genetic control of SI in olive gave conflicting results, and only recently, the genetic control of SI has been disclosed, revealing that olive possesses an unconventional homomorphic sporophytic diallelic system of SI, dissimilar from other described plants. This system, characterized by the presence of two SI groups, prevents self-fertilization and regulates inter-compatibility between cultivars, such that cultivars bearing the same incompatibility group are incompatible. Despite the presence of a functional SI, some varieties, in particular conditions, are able to set seeds following self-fertilization, a mechanism known as pseudo-self-compatibility (PSC), as widely reported in previous literature. Here, we summarize the results of previous works on SI in olive, particularly focusing on the occurrence of self-fertility, and offer a new perspective in view of the recent elucidation of the genetic architecture of the SI system in olive. Recent advances in research aimed at unraveling the molecular bases of SI and its breakdown in olive are also presented. The clarification of these mechanisms may have a huge impact on orchard management and will provide fundamental information for the future of olive breeding programs.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2019. Vol. 10, article id 725
Keywords [en]
Olea europaea L., pseudo-self-compatibility, pollen-pistil interaction, sporophytic system, self-incompatibility
National Category
Horticulture
Identifiers
URN: urn:nbn:se:umu:diva-161585DOI: 10.3389/fpls.2019.00725ISI: 000473047800001OAI: oai:DiVA.org:umu-161585DiVA, id: diva2:1338353
Available from: 2019-07-22 Created: 2019-07-22 Last updated: 2019-07-22Bibliographically approved

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Collani, Silvio
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