TICKET attracts pollen tubes and mediates reproductive isolation between relative species in Brassicaceae  

作　　者：Jiang-Guo Meng Meng-Xia Zhang Wei-Cai Yang Hong-Ju Li 

机构地区：[1]State Key Laboratory of Molecular Developmental Biology,Institute of Genetics and Developmental Biology,Chinese Academy of Sciences,Beijing 100101,China [2]Collage of Advanced Agricultural Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Science China(Life Sciences)》2019年第11期1413-1419,共7页中国科学（生命科学英文版）

基　　金：supported by the National Natural Science Foundation of China (31330053 to W.Y.; 31622010, 31870295 and 31270351 to H.L.)

摘　　要：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.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.

关 键 词：POLLEN tube ATTRACTION PEPTIDE ATTRACTANT REPRODUCTIVE isolation 

分 类 号：Q94[生物学—植物学]