Genome-wide dissection of heterosis for yield traits in two-line hybrid rice populations
Abstract Heterosis has been widely utilized in agriculture and is important for world food safety. Many genetic models have been proposed as mechanisms underlying heterosis during the past century, yet more evidence is needed to support such models. To investigate heterosis in two-line hybrid rice,...
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Nature Portfolio
2017-08-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-017-06742-7 |
| _version_ | 1830287253902983168 |
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| author | Gang Zhen Peng Qin Kai Yu Liu Dong Yang Nie Yuan Zhu Yang Xing Wang Deng Hang He |
| author_facet | Gang Zhen Peng Qin Kai Yu Liu Dong Yang Nie Yuan Zhu Yang Xing Wang Deng Hang He |
| author_sort | Gang Zhen |
| collection | DOAJ |
| description | Abstract Heterosis has been widely utilized in agriculture and is important for world food safety. Many genetic models have been proposed as mechanisms underlying heterosis during the past century, yet more evidence is needed to support such models. To investigate heterosis in two-line hybrid rice, we generated a partial diallel crossing scheme, which consisted of approximately 500 F1 hybrids derived from 14 male sterile lines and 39 restorer lines. In this population, increased panicle number played the most important role in yield heterosis of hybrid rice. Genome-wide association studies identified many QTLs related to the yield traits of F1 hybrids, better paternal heterosis and special combining ability. Relevant genes, including Hd3a, qGL3, OsmiR156h, and LAX2, were identified as candidates within these QTLs. Nearly forty percent of the QTLs had only two genotypes in the F1 hybrids, mainly because the maternal lines were under intense selective pressure. Further analysis found male sterile lines and restorer lines made different superior allele contributions to F1 hybrids, and their contributions varied among different traits. These results extend our understanding of the molecular basis of heterosis in two-line hybrid rice. |
| first_indexed | 2024-12-19T04:14:46Z |
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| id | doaj.art-e5130bedc6f74e63912ef4e9fe2487c2 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-19T04:14:46Z |
| publishDate | 2017-08-01 |
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| spelling | doaj.art-e5130bedc6f74e63912ef4e9fe2487c22022-12-21T20:36:20ZengNature PortfolioScientific Reports2045-23222017-08-017111410.1038/s41598-017-06742-7Genome-wide dissection of heterosis for yield traits in two-line hybrid rice populationsGang Zhen0Peng Qin1Kai Yu Liu2Dong Yang Nie3Yuan Zhu Yang4Xing Wang Deng5Hang He6State Key Laboratory of Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences, School of Advanced Agriculture Sciences and School of Life Sciences, Peking UniversityAva Seed Academy of SciencesAva Seed Academy of SciencesAva Seed Academy of SciencesAva Seed Academy of SciencesState Key Laboratory of Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences, School of Advanced Agriculture Sciences and School of Life Sciences, Peking UniversityState Key Laboratory of Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences, School of Advanced Agriculture Sciences and School of Life Sciences, Peking UniversityAbstract Heterosis has been widely utilized in agriculture and is important for world food safety. Many genetic models have been proposed as mechanisms underlying heterosis during the past century, yet more evidence is needed to support such models. To investigate heterosis in two-line hybrid rice, we generated a partial diallel crossing scheme, which consisted of approximately 500 F1 hybrids derived from 14 male sterile lines and 39 restorer lines. In this population, increased panicle number played the most important role in yield heterosis of hybrid rice. Genome-wide association studies identified many QTLs related to the yield traits of F1 hybrids, better paternal heterosis and special combining ability. Relevant genes, including Hd3a, qGL3, OsmiR156h, and LAX2, were identified as candidates within these QTLs. Nearly forty percent of the QTLs had only two genotypes in the F1 hybrids, mainly because the maternal lines were under intense selective pressure. Further analysis found male sterile lines and restorer lines made different superior allele contributions to F1 hybrids, and their contributions varied among different traits. These results extend our understanding of the molecular basis of heterosis in two-line hybrid rice.https://doi.org/10.1038/s41598-017-06742-7 |
| spellingShingle | Gang Zhen Peng Qin Kai Yu Liu Dong Yang Nie Yuan Zhu Yang Xing Wang Deng Hang He Genome-wide dissection of heterosis for yield traits in two-line hybrid rice populations Scientific Reports |
| title | Genome-wide dissection of heterosis for yield traits in two-line hybrid rice populations |
| title_full | Genome-wide dissection of heterosis for yield traits in two-line hybrid rice populations |
| title_fullStr | Genome-wide dissection of heterosis for yield traits in two-line hybrid rice populations |
| title_full_unstemmed | Genome-wide dissection of heterosis for yield traits in two-line hybrid rice populations |
| title_short | Genome-wide dissection of heterosis for yield traits in two-line hybrid rice populations |
| title_sort | genome wide dissection of heterosis for yield traits in two line hybrid rice populations |
| url | https://doi.org/10.1038/s41598-017-06742-7 |
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