Show simple item record

The Rise of Apomixis in Natural Plant Populations

dc.contributor.authorHojsgaard, Diego
dc.contributor.authorHörandl, Elvira
dc.description.abstractApomixis, the asexual reproduction via seed, has many potential applications for plant breeding by maintaining desirable genotypes over generations. Since most major crops do not express natural apomixis, it is useful to understand the origin and maintenance of apomixis in natural plant systems. Here, we review the state of knowledge on origin, establishment and maintenance of natural apomixis. Many studies suggest that hybridization, either on diploid or polyploid cytotypes, is a major trigger for the formation of unreduced female gametophytes, which represents the first step toward apomixis, and must be combined to parthenogenesis, the development of an unfertilized egg cell. Nevertheless, fertilization of endosperm is still needed for most apomictic plants. Coupling of these three steps appears to be a major constraint for shifts to natural apomixis. Adventitious embryony is another developmental pathway toward apomixis. Establishment of a newly arisen apomictic lineage is often fostered by side- effects of polyploidy. Polyploidy creates an immediate reproductive barrier against the diploid parental and progenitor populations; it can cause a breakdown of genetic self- incompatibility (SI) systems which is needed to establish self-fertility of pseudogamous apomictic lineages; and finally, polyploidy could indirectly help to establish an apomictic cytotype in a novel ecological niche by increasing adaptive potentials of the plants. This step may be followed by a phase of diversification and range expansion, mostly described as geographical parthenogenesis. The utilization of apomixis in crops must consider the potential risks of pollen transfer and introgression into sexual crop fields, which might be overcome by using pollen-sterile or cleistogamous variants. Another risk is the escape into natural vegetation and potential invasiveness of apomictic plants which needs careful management and consideration of ecological
dc.description.sponsorshipOpen-Access-Publikationsfonds 2019
dc.rightsNamensnennung 4.0 International*
dc.subjectapomictic crops; grass cultivars; polyploidy; reproductive assurance; sexuality; speciation; triploid bridgede
dc.titleThe Rise of Apomixis in Natural Plant Populationsde
dc.bibliographicCitation.journalFrontiers in Plant Sciencede

Files in this item


This item appears in the following Collection(s)

Show simple item record

These documents are avalilable under the license: