Pre-and post-pollination barriers between two exotic and five native Sagittaria species:Implications for species conservation  

作　　者：Ting-Ting Zou Sen-Tao Lyu Qi-Lin Jiang Shu-He Shang Xiao-Fan Wang 

机构地区：[1]Laboratory of Plant Systematics and Evolutionary Biology,College of Life Sciences,Wuhan University,Wuhan 430072,China

出　　处：《Plant Diversity》2023年第4期456-468,共13页植物多样性（英文版）

基　　金：This study was supported by the National Science Foundation of China(31970250).

摘　　要：Anthropogenic introduction of species has resulted in a breakdown of geographical barriers and hybridization in previously allopatric species.Thus,examining hybridization proneness of exotic species contributes to revealing its potential threat.Moreover,reproductive barriers may be strengthened or weakened due to long-term geographical isolation for these newly sympatric species.However,few studies have evaluated multiple barriers between alien and native species.In this study,we quantified the importance of four pre-pollination barriers(phenological,floral traits,pollen production,and floral constancy)and four post-pollination barriers(pollen-pistil incompatibility,seed set,seed viability,and seedling survival)between two introduced and five native Sagittaria species.Results showed that introduced S.platyphylla was cross-compatible with two native species,whereas introduced S.montevidensis was incapable of hybridizing with any native species.Different barriers were asymmetric within species pairs and multiple barriers acted in concert to maintain species boundaries.Postpollination barriers contributed more to total reproductive isolation in native species,whereas prepollination barriers played a stronger role in total reproductive isolation for two introduced species.Seed set was the only barrier that was positively correlated with genetic distance.Our results provide a perspective to better understand reproductive barriers for secondary contact species.We highlight the importance of monitoring hybridization events before human introduction and the possible conservation strategies to remove invasive species with hybridization proneness.

关 键 词：ALISMATACEAE Introduced species CONSERVATION HYBRIDIZATION Reproductive isolation Sagittaria 

分 类 号：Q948[生物学—植物学]