Mating system and pollination biology of a high-mountain perennial plant,Rhodiola dumulosa(Crassulaceae)  

作　　者：Lin Zhu Anru Lou 

机构地区：[1]State Key Laboratory of Earth Surface Processes and Resource Ecology,College of Life Sciences of Beijing Normal University,Beijing 100875,China

出　　处：《Journal of Plant Ecology》2010年第3期219-227,共9页植物生态学报（英文版）

基　　金：National Natural Science Foundation of China(30770356).

摘　　要：Aims Rhodiola dumulosa is a perennial herb growing in a naturally fragmented habitat of high-mountain rocks.This research aims to(i)investigate the mating system characteristics and pollination biology of R.dumulosa,(ii)study the effects of ecological factors on the mating system and pollination biology of R.dumulosa and(iii)assess the relationship between its pollination and mating system.Methods Mating system parameters were analysed using allozyme markers.Growth of pollen tubes from artificial self-and cross-pollination was also examined.Field investigations were conducted on insect flower visitation during the blooming period of R.dumulosa.Relationships among mating system,insect flower visitation frequency and environmental factors were assessed.Important Findings The results showed that(i)R.dumulosa has a mixed-mating system:it is self-compatible and primarily outbreeding,with the multilocus outcrossing rate(tm)ranging from 0.58960.078(6 standard deviation)to 0.84660.077;inbreeding coefficients of maternal parents(F)were zero,indicating that inbreeding depression was intense.(ii)Light intensity and temperature impacted the visitation of the principal pollinators,the syrphid Eristalis tenax and the bumblebee Bombus pyrosoma.(iii)Population size plays an important role in the mating system and pollination.Populations received more frequent visits by the principal pollinators usually had higher outcrossing rates.Pollination to some extent affects the mating system of R.dumulosa and it is important to maintain large populations to prevent further inbreeding and to maintain pollinators to facilitate outcrossing.

关 键 词：ALLOZYME mating system pollen tube growth POLLINATION Rhodiola dumulosa 

分 类 号：R31[医药卫生—基础医学]