論文 - 詳細
| RRC ID | 65971 |
|---|---|
| 著者 | Takisawa R, Nakazaki T, Nunome T, Fukuoka H, Kataoka K, Saito H, Habu T, Kitajima A. |
| タイトル | The parthenocarpic gene Pat-k is generated by a natural mutation of SlAGL6 affecting fruit development in tomato (Solanum lycopersicum L.). |
| ジャーナル | BMC Plant Biol |
| Abstract |
BACKGROUND:Parthenocarpy is a desired trait in tomato because it can overcome problems with fruit setting under unfavorable environmental conditions. A parthenocarpic tomato cultivar, 'MPK-1', with a parthenocarpic gene, Pat-k, exhibits stable parthenocarpy that produces few seeds. Because 'MPK-1' produces few seeds, seedlings are propagated inefficiently via cuttings. It was reported that Pat-k is located on chromosome 1. However, the gene had not been isolated and the relationship between the parthenocarpy and low seed set in 'MPK-1' remained unclear. In this study, we isolated Pat-k to clarify the relationship between parthenocarpy and low seed set in 'MPK-1'. RESULTS:Using quantitative trait locus (QTL) analysis for parthenocarpy and seed production, we detected a major QTL for each trait on nearly the same region of the Pat-k locus on chromosome 1. To isolate Pat-k, we performed fine mapping using an F4 population following the cross between a non-parthenocarpic cultivar, 'Micro-Tom' and 'MPK-1'. The results showed that Pat-k was located in the 529 kb interval between two markers, where 60 genes exist. By using data from a whole genome re-sequencing and genome sequence analysis of 'MPK-1', we could identify that the SlAGAMOUS-LIKE 6 (SlAGL6) gene of 'MPK-1' was mutated by a retrotransposon insertion. The transcript level of SlAGL6 was significantly lower in ovaries of 'MPK-1' than a non-parthenocarpic cultivar. From these results, we could conclude that Pat-k is SlAGL6, and its down-regulation in 'MPK-1' causes parthenocarpy and low seed set. In addition, we observed abnormal micropyles only in plants homozygous for the 'MPK-1' allele at the Pat-k/SlAGL6 locus. This result suggests that Pat-k/SlAGL6 is also related to ovule formation and that the low seed set in 'MPK-1' is likely caused by abnormal ovule formation through down-regulation of Pat-k/SlAGL6. CONCLUSIONS:Pat-k is identical to SlAGL6, and its down-regulation causes parthenocarpy and low seed set in 'MPK-1'. Moreover, down-regulation of Pat-k/SlAGL6 could cause abnormal ovule formation, leading to a reduction in the number of seeds. |
| 巻・号 | 18(1) |
| ページ | 72 |
| 公開日 | 2018-4-27 |
| DOI | 10.1186/s12870-018-1285-6 |
| PII | 10.1186/s12870-018-1285-6 |
| PMID | 29699487 |
| PMC | PMC5921562 |
| MeSH | Chromosome Mapping Flowers / growth & development Flowers / ultrastructure Fruit / genetics* Fruit / growth & development Genes, Plant / genetics* Genes, Plant / physiology Genome, Plant / genetics Lod Score Mutation / genetics Parthenogenesis / genetics* Polymorphism, Single Nucleotide / genetics Quantitative Trait Loci / genetics Seeds / growth & development Sequence Analysis, DNA Solanum lycopersicum / genetics* Solanum lycopersicum / growth & development |
| IF | 3.497 |
| リソース情報 | |
| トマト | TOMATOMICS研究利用 |