Elevational and temporal patterns of pollination success in distylous and homostylous buckwheats(Fagopyrum)in the Hengduan Mountains  

作　　者：Ling-Yun Wu Shuang-Quan Huang Ze-Yu Tong 

机构地区：[1]Faculty of Resources and Environmental Science,Hubei University,Wuhan 430062,China [2]Institute of Evolution and Ecology,School of Life Sciences,Central China Normal University,Wuhan 430079,China

出　　处：《Plant Diversity》2024年第5期661-670,共10页植物多样性（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.31900204,32071671,32030071);the Postdoctoral Research Foundation of China(grant no.2019M652674);the Fundamental Research Funds for the Central Universities(grant no.CCNU22LJ003).

摘　　要：Reproductive strategies of sexually dimorphic plants vary in response to the environment.Here,we ask whether the sexual systems of Fagopyrum species(i.e.,selfing homostylous and out-crossing distylous)represent distinct adaptive strategies to increase reproductive success in changing alpine environments.To answer this question,we determined how spatial and temporal factors(e.g.,elevation and peak flowering time)affect reproductive success(i.e.,stigmatic pollen load)in nine wild Fagopyrum species(seven distylous and two homostylous)among 28 populations along an elevation gradient of 1299-3315 m in the Hengduan Mountains,southwestern China.We also observed pollinators and conducted hundreds of hand pollinations to investigate inter/intra-morph compatibility,self-compatibility and pollen limitation in four Fagopyrum species(two distylous and two homostylous).We found that Fagopyrum species at higher elevation generally had bigger flowers and more stigmatic pollen loads;lateflowering individuals had smaller flowers and lower pollen deposition.Stigmatic pollen deposition was more variable in distylous species than in homostylous species.Although seed set was not pollenlimited in all species,we found that fruit set was much lower in distylous species,which rely on frequent pollinator visits,than in homostylous species capable of autonomous self-pollination.Our findings that pollination success increases at high elevations and decreases during the flowering season suggest that distylous and homostylous species have spatially and temporally distinct reproductive strategies related to environment-dependent pollinator activity.

关 键 词：Biodiversity hotspot Elevation gradient FAGOPYRUM Stigmatic pollen load Temporal pattern 

分 类 号：S517[农业科学—作物学]