Journal
MOLECULAR PLANT
Volume 14, Issue 2, Pages 208-222Publisher
CELL PRESS
DOI: 10.1016/j.molp.2020.11.008
Keywords
hybrid speciation; genetic mechanism; reproductive isolation; alternate alleles; parental species
Categories
Funding
- National Natural Science Foundation of China [31590821, 91731301, 41471042, 31561123001]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB31010300]
- National Key Research and Development Program of China [2017YFC0505203]
- Second Tibetan Plateau Scientific Expedition and Research (STEP) program [2019QZKK0502]
- Fundamental Research Funds for the Central Universities [2020SCUNL207, SCU2018D006, SCU2019D013]
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This study reveals that reproductive isolation in a homoploid hybrid plant species originates from the inheritance of alternate alleles at genes that determine parental premating isolation. The hybrid species inherits isolating major genes related to flowering time from one parent and genes related to iron tolerance from the other, leading to reproductive isolation through different mechanisms.
It is increasingly realized that homoploid hybrid speciation (HHS), which involves no change in chromosome number, is an important mechanism of speciation. HHS will likely increase in frequency as ecological and geographical barriers between species are continuing to be disrupted by human activities. HHS requires the establishment of reproductive isolation between a hybrid and its parents, but the underlying genes and genetic mechanisms remain largely unknown. In this study, we reveal by integrated approaches that reproductive isolation originates in one homoploid hybrid plant species through the inheritance of alternate alleles at genes that determine parental premating isolation. The parent species of this hybrid species are reproductively isolated by differences in flowering time and survivorship on soils containing high concentrations of iron. We found that the hybrid species inherits alleles of parental isolating major genes related to flowering time from one parent and alleles of major genes related to iron tolerance from the other parent. In this way, it became reproductively isolated from one parent by the difference in flowering time and from the other by habitat adaptation (iron tolerance). These findings and further modeling results suggest that HHS may occur relatively easily via the inheritance of alternate parental premating isolating genes and barriers.
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