Journal
SCIENCE CHINA-LIFE SCIENCES
Volume 62, Issue 11, Pages 1413-1419Publisher
SCIENCE PRESS
DOI: 10.1007/s11427-019-9833-3
Keywords
pollen tube attraction; peptide attractant; reproductive isolation
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Funding
- National Natural Science Foundation of China [31330053, 31622010, 31870295, 31270351]
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In flowering plants, pollen tubes are attracted to the ovule by secreted peptides to release the sperm cells for double fertilization. This process is species-specific and acts as an important stage of reproductive isolation between species. Here we identified a cysteine-rich peptide TICKET2 in Arabidopsis thaliana and its orthologs in Arabidopsis lyrata and Capsella rebella that can attract the conspecific pollen tubes, but not the pollen tubes of relative species in Brassicaceae. Genetic knockout of the AtTICKET subclade compromised the pollen tube attraction efficiency. This study identified a new pollen tube attracting signal and shed light on the molecular basis of reproductive isolation.
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