西北师范大学学报（自然科学版）2018，Vol.54Issue(1)：55-60,76,7.DOI:10.16783/j.cnki.nwnuz.2018.01.010
高山植物甘青铁线莲花冠下垂现象适应性意义
The adaptive significances of dow nw ard orientation flow ers in alpine species Clematis tangutica
摘要
Abstract
This study takes Clematis tangutica(Maxim .) Korsh. , which distributes in high altitude , as the research object . By changing corolla direction from facing down to up , we observe the pollinator attracting , the pollen quantity , pollen germination rate , seed setting ratio and the seed characters of this species under the two different directions ,aiming to find out the adaptive advantages of flowers drooping of C. tangutica . The results showed that after flowers artificially erected , the pollen quantity and pollen germination rate significantly decreased when exposed in rain wash condition ,and the pollen germination rate decreased sharply when presented in sunlight condition , indicating that the flower downward orientation might play an important role in protecting male function and increase male fitness by preventing flowers from rain wash and sunlight . After flowers artificially erected , the single flower seed yield and seed setting ratio of C. tangutica reduced which indicated that flower upward orientation may decrease female fitness .The main pollinators of C.tangutica were Bombus spp .and Apis cerana ,and their visit frequencies and stay time/visit/flower did not differ significantly between flowers of these two orientations (facing up and down) , suggesting that the flowers direction changing may not affect the reproductive contribution of the main pollinators . Our results suggested that the flower downward of C. tangutica could not influence the pollinator variety and efficiency , but could significantly improve the male and female fitness , which might act as an effective adaptation strategy to ensure reproductive success of C. tangutica .关键词
甘青铁线莲/高海拔/花下垂/繁育系统/花朝向改变Key words
Clematis tangutica(Maxim .) Korsh ./adaptive significances/downward orientation flowers/breeding system/flower orientation changing分类
农业科技引用本文复制引用
孙坤,范宝强,侯勤正,王思源,张世虎..高山植物甘青铁线莲花冠下垂现象适应性意义[J].西北师范大学学报（自然科学版）,2018,54(1):55-60,76,7.基金项目
国家自然科学基金资助项目(31270429 ) （31270429 ）
