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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Conner, Joann A. Chae, Keun Ozias-akins, Peggy Mookkan, Muruganantham Huo, Heqiang |
| Description | Author Affiliation: Conner JA ( Department of Horticulture, University of Georgia Tifton Campus, Tifton, GA 31973.); Mookkan M ( Department of Horticulture, University of Georgia Tifton Campus, Tifton, GA 31973.); Huo H ( Department of Horticulture, University of Georgia Tifton Campus, Tifton, GA 31973.); Chae K ( Department of Horticulture, University of Georgia Tifton Campus, Tifton, GA 31973.); Ozias-Akins P ( Department of Horticulture, University of Georgia Tifton Campus, Tifton, GA 31973 pozias@uga.edu.); |
| Abstract | Apomixis is a naturally occurring mode of asexual reproduction in flowering plants that results in seed formation without the involvement of meiosis or fertilization of the egg. Seeds formed on an apomictic plant contain offspring genetically identical to the maternal plant. Apomixis has significant potential for preserving hybrid vigor from one generation to the next in highly productive crop plant genotypes. Apomictic Pennisetum/Cenchrus species, members of the Poaceae (grass) family, reproduce by apospory. Apospory is characterized by apomeiosis, the formation of unreduced embryo sacs derived from nucellar cells of the ovary and, by parthenogenesis, the development of the unreduced egg into an embryo without fertilization. In Pennisetum squamulatum (L.) R.Br., apospory segregates as a single dominant locus, the apospory-specific genomic region (ASGR). In this study, we demonstrate that the PsASGR-BABY BOOM-like (PsASGR-BBML) gene is expressed in egg cells before fertilization and can induce parthenogenesis and the production of haploid offspring in transgenic sexual pearl millet. A reduction of PsASGR-BBML expression in apomictic $F_{1}$ RNAi transgenic plants results in fewer visible parthenogenetic embryos and a reduction of embryo cell number compared with controls. Our results endorse a key role for PsASGR-BBML in parthenogenesis and a newly discovered role for a member of the BBM-like clade of APETALA 2 transcription factors. Induction of parthenogenesis by PsASGR-BBML will be valuable for installing parthenogenesis to synthesize apomixis in crops and will have further application for haploid induction to rapidly obtain homozygous lines for breeding. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 36 |
| Volume Number | 112 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2015-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Apomixis Genetics Genes, Plant Ovule Parthenogenesis Poaceae Amino Acid Sequence Cenchrus Embryology Growth & Development Gene Expression Profiling Gene Expression Regulation, Developmental Gene Expression Regulation, Plant Molecular Sequence Data Oligonucleotide Array Sequence Analysis Pennisetum Phylogeny Plant Proteins Classification Plants, Genetically Modified RNA Interference Reverse Transcriptase Polymerase Chain Reaction Sequence Homology, Amino Acid Research Support, U.S. Gov't, Non-P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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