ArticlePlant physiology2013
The conserved chimeric transcript UPGRADE2 is associated with unreduced pollen formation and is exclusively found in apomictic Boechera species.
Article in Plant physiology, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers.
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Who cites it
21 citing papers in PubMed, 46 citations in OpenAlex.
- Basis of apomixis in flowering plants - state of the art and research perspectives.Plant reproduction · 2026Review
- Paradigm shift in apomixis research: Targeting mutants with elements of apomixis in sexual crops.Planta · 2026Review
- The Genus Boechera as a Model for Apomixis Research.Methods in molecular biology (Clifton, N.J.) · 2026Article
- The phenomenon of autonomous endosperm in sexual and apomictic plants.Journal of experimental botany · 2023Review
- Evolution of an Apomixis-Specific Allele Class in Supernumerary Chromatin of ApomicticFrontiers in plant science · 2022Article
- Apomixis: genetic basis and controlling genes.Horticulture research · 2022Article
- Transcriptomes and DNA methylomes in apomictic cells delineate nucellar embryogenesis initiation in citrus.DNA research : an international journal for rapid publication of reports on genes and genomes · 2021Article
- A study of the heterochronic sense/antisense RNA representation in florets of sexual and apomictic Paspalum notatum.BMC genomics · 2021Article
- Chasing the Apomictic Factors in theGenes · 2020Article
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- Review
- Global identification and analysis revealed differentially expressed lncRNAs associated with meiosis and low fertility in autotetraploid rice.BMC plant biology · 2020Article
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- TheFrontiers in plant science · 2019Review
- Establishing the cell biology of apomictic reproduction in diploid Boechera stricta (Brassicaceae).Annals of botany · 2018Article
- The Role of Microsatellites in Streptophyta Gene Evolution.Journal of molecular evolution · 2017Article
- Long non-coding RNA regulation of reproduction and development.Molecular reproduction and development · 2015Review
- Hybrid apomicts trapped in the ecological niches of their sexual ancestors.Proceedings of the National Academy of Sciences of the United States of America · 2015Article
- Beyond the thale: comparative genomics and genetics of Arabidopsis relatives.Nature reviews. Genetics · 2015Review
Corrections and comments
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Authors and funding
9 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
In apomictic Boechera spp., meiotic diplospory leads to the circumvention of meiosis and the suppression of recombination to produce unreduced male and female gametes (i.e. apomeiosis). Here, we have established an early flower developmental staging system and have performed microarray-based comparative gene expression analyses of the pollen mother cell stage in seven diploid sexual and seven diploid apomictic genotypes to identify candidate factors for unreduced pollen formation. We identified a transcript unique to apomictic Boechera spp. called UPGRADE2 (BspUPG2), which is highly up-regulated in their pollen mother cells. BspUPG2 is highly conserved among apomictic Boechera spp. genotypes but has no homolog in sexual Boechera spp. or in any other taxa. BspUPG2 undergoes posttranscriptional processing but lacks a prominent open reading frame. Together with the potential of stably forming microRNA-like secondary structures, we hypothesize that BspUPG2 functions as a long regulatory noncoding messenger RNA-like RNA. BspUPG2 has apparently arisen through a three-step process initiated by ancestral gene duplication of the original BspUPG1 locus, followed by sequential insertions of segmentally duplicated gene fragments, with final exonization of its sequence structure. Its genesis reflects the hybridization history that characterizes the genus Boechera.
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