Apomixis in flowering plants: Developmental and evolutionary considerations

León-Martínez, Gloria; Vielle‐Calzada, Jean‐Philippe

doi:10.1016/bs.ctdb.2018.11.014

Cited by 32 publications

(33 citation statements)

References 188 publications

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“…Overall, the high conservation degree found in the three functional domains of the 12 SPL-like proteins analysed suggests a common role of this master gene in promoting megasporocytes differentiation both in monocotyledons and dicotyledons. Moreover, the identification of SPL-like sequences in A. trichopoda, N. colorata and N. thermarum and the lack of evidences of apomictic reproduction in these basalmost angiosperms species [29,93], support the hypothesis that apomixis may have evolved from sex. In the event that apomixis may not have stemmed from sexuality, the total absence of the SPL/NZZ gene was expected in apomictic species, as found for the Hypericum perforatum genome used as model, since the role of this gene in the initiation of the sexual pathway is now well consolidated.…”

Section: The Comparative Genomics Of Master Genesmentioning

confidence: 77%

“…Although originally thought to represent an ancient evolutionary predisposition manifested by specific taxa [19], a detailed phylogenetic analysis coupled with apomixis distribution recently performed by León-Martínez and Vielle-Calzada [29] suggests a multiple independent emergence and rapid spreading of apomixis among large families.…”

Section: The Comparative Genomics Of Master Genesmentioning

confidence: 99%

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A Reappraisal of the Evolutionary and Developmental Pathway of Apomixis and Its Genetic Control in Angiosperms

Barcaccia

Palumbo

Sgorbati

et al. 2020

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Apomixis sensu stricto (agamospermy) is asexual reproduction by seed. In angiosperms it represents an easy byway of life cycle renewal through gamete-like cells that give rise to maternal embryos without ploidy reduction (meiosis) and ploidy restitution (syngamy). The origin of apomixis still represents an unsolved problem, as it may be either evolved from sex or the other way around. This review deals with a reappraisal of the origin of apomixis in order to deepen knowledge on such asexual mode of reproduction which seems mainly lacking in the most basal angiosperm orders (i.e., Amborellales, Nymphaeales and Austrobaileyales, also known as ANA-grade), while it clearly occurs in different forms and variants in many unrelated families of monocots and eudicots. Overall findings strengthen the hypothesis that apomixis as a whole may have evolved multiple times in angiosperm evolution following different developmental pathways deviating to different extents from sexuality. Recent developments on the genetic control of apomixis in model species are also presented and adequately discussed in order to shed additional light on the antagonist theories of gain- and loss-of-function over sexuality.

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Section: The Comparative Genomics Of Master Genesmentioning

confidence: 77%

Section: The Comparative Genomics Of Master Genesmentioning

confidence: 99%

A Reappraisal of the Evolutionary and Developmental Pathway of Apomixis and Its Genetic Control in Angiosperms

Barcaccia

Palumbo

Sgorbati

et al. 2020

Genes

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“…Differences observed among plants in haploid and diploid parthenogenesis likely underly a combination of genetic redundancy and divergent evolution in regulatory factors ensuring egg cell quiescence prior fertilization [183].…”

Section: Parthenogenetic Mutantsmentioning

confidence: 99%

“…Even though the endeavor to get an apomictic crop is still technically demanding and challenging (e.g., underlying gene networks and regulatory pathways differ among apomicts, and hence, manipulating those to shift developmental pathways will present distinct hurdles [144,183]), it will help us realize whether implementing apomixis breeding in agroscience is a feasible task or not, a pending topic that is becoming critical and will help humanity resolving current and future needs on food supply, landscape management, and conservation of biodiversity areas.…”

Section: Current View and Prospectsmentioning

confidence: 99%

Apomixis Technology: Separating the Wheat from the Chaff

Hojsgaard

2020

Genes

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Projections indicate that current plant breeding approaches will be unable to incorporate the global crop yields needed to deliver global food security. Apomixis is a disruptive innovation by which a plant produces clonal seeds capturing heterosis and gene combinations of elite phenotypes. Introducing apomixis into hybrid cultivars is a game-changing development in the current plant breeding paradigm that will accelerate the generation of high-yield cultivars. However, apomixis is a developmentally complex and genetically multifaceted trait. The central problem behind current constraints to apomixis breeding is that the genomic configuration and molecular mechanism that initiate apomixis and guide the formation of a clonal seed are still unknown. Today, not a single explanation about the origin of apomixis offer full empirical coverage, and synthesizing apomixis by manipulating individual genes has failed or produced little success. Overall evidence suggests apomixis arise from a still unknown single event molecular mechanism with multigenic effects. Disentangling the genomic basis and complex genetics behind the emergence of apomixis in plants will require the use of novel experimental approaches benefiting from Next Generation Sequencing technologies and targeting not only reproductive genes, but also the epigenetic and genomic configurations associated with reproductive phenotypes in homoploid sexual and apomictic carriers. A comprehensive picture of most regulatory changes guiding apomixis emergence will be central for successfully installing apomixis into the target species by exploiting genetic modification techniques.

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“…The endosperm cells are derived from a fertilized central cell and provide nutrients to the embryo for the seed germination. The embryo cells with diploid genome are originated by gametic fusion between sperm and egg cells, both of which have a set of haploid genomes produced by a meiotic division (Leon‐Martinez and Vielle‐Calzada 2019). Previously, an important finding was reported that a simultaneous knock‐down of three genes related to meiosis, SPO11‐1 , REC8, and OSD1 , can turn from the process of meiosis of egg cells to that of mitosis (Mitosis instead of Meiosis; MiMe) in Arabidopsis and rice.…”

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confidence: 99%