Journal
SCIENCE
Volume 364, Issue 6443, Pages 851-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aau9564
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Funding
- National Natural Science Foundation of China [31830004, 31620103903, 31621001, 91331201]
- Peking-Tsinghua Joint Center for Life Sciences in-house grant
- German Research Council (DFG) via the Collaborative Research Center [SFB924]
- National Institutes of Health [R01GM109080]
- China Postdoctoral Science Foundation [2017M620509]
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Reproductive isolation is a prerequisite for speciation. Failure of communication between female tissues of the pistil and paternal pollen tubes imposes hybridization barriers in flowering plants. Arabidopsis thaliana LURE1 (AtLURE1) peptides and their male receptor PRK6 aid attraction of the growing pollen tube to the ovule. Here, we report that the knockout of the entire AtLURE1 gene family did not affect fertility, indicating that AtLURE1-PRK6-mediated signaling is not required for successful fertilization within one Arabidopsis species. AtLURE1s instead function as pollen tube emergence accelerators that favor conspecific pollen over pollen from other species and thus promote reproductive isolation. We also identified maternal peptides XIUQIU1 to -4, which attract pollen tubes regardless of species. Cooperation between ovule attraction and pollen tube growth acceleration favors conspecific fertilization and promotes reproductive isolation.
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