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Polyploidization and sexual dimorphism of floral traits in a subdioecious population of Dasiphora glabra

Journal of Plant Ecology 2021年第2期14卷 229-240页

作者： Lin-Lin Wang Na-Cai Yang Min-Yu Chen Yong-Ping Yang Yuan-Wen Duan CAS Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650201YunnanChina Institute of Tibetan Plateau Research at Kunming Kunming Institute of BotanyChinese Academy of SciencesKunming 650201YunnanChina University of the Chinese Academy of Sciences Beijing 100049China

Aims Sexual dimorphism is a common trait in plants with sex separation,which could influence female and male functions *** a subdioecious population of Dasiphora glabra on the Qinghai-Tibet Plateau,we investigated sexual dimorphism of floral traits and their effects on pollinator visitation,pollen flow and seed *** also examined differences in genome size of hermaphroditic and dioecious *** We examined sexual dimorphism in flower number,flower size,and pollen and ovule production in a subdioecious population of *** compared pollinator visitation,pollen dispersal and seed production between *** also examined the genome size of three sex morphs using flow *** Findings The number of hermaphroditic plants was significantly more than that of male and female plants,and dioecious plants accounted for ca.40%in the study *** plants produced significantly more flowers than male and female *** size of male flowers was significantly larger than that of female and hermaphroditic *** flowers did not produce more pollen grains than hermaphroditic flowers,but female flowers produced more ovules than hermaphroditic *** were the most frequent flower visitors and preferred large flowers,but their movements between flowers did not show any preference to large *** pollen flows suggested that effective pollen transfer was generally low for both hermaphroditic and male flowers,corresponding to the low seed set of naturally pollinated *** contents of male and female plants were *** times than those of hermaphroditic *** results suggest male and female individuals have undergone polyploidy events and thus are not compatible with hermaphroditic *** dimorphism in floral traits in relation to pollination of dioecious plants might show an advantage in female and male functions,but this advantage is masked largely by low effectiveness o

关键词： natural selection flower traits polyploidy sex separation sexual dimorphism

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The flowerpiercers interactions with a community of high Andean plants

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Avian Research 2021年第2期12卷 181-194页

作者： Jairo Andrés Cuta-Pineda Luis Alejandro Arias-Sosa Roxibell C.Pelayo Research Group“Grupo Ecología de Organismos(GEO-UPTC)” TunjaColom-bia Maestría en Ciencia Biológicas Universidad Pedagógica y Tecnológica de ColombiaTunjaColombia Instituto de Ciencias Ambientales y Ecológicas(ICAE) Universidad de Los AndesMéridaVenezuela

Background:flowerpiercers(Diglossa)are traditionally considered as“parasites”of the pollination processes,as they can access the nectar without entering in contact with the reproductive structures of the ***,the effect of flowerpiercers seems to vary according to their behavior and the flower’s ***,in this work,we aimed to explore the floral characteristics that may determine the susceptibility to robbing and pollen transport by ***,we identified the potential types of interactions and studied interaction network ***:We collected the information of 16 ornithophilic plants regarding their floral traits and robbing ***,we captured 4 species of flowerpiercers and evaluated pollen transport(frequency and loads).We tested the correlation between floral traits,robbing frequency,and pollen ***,we used these variables in a cluster and principal component analyses to identify the potential types of ***,we analyzed and com-pared the structure of the plants-flowerpiercers interaction ***:Nectar production significantly influenced both nectar robbing and pollen *** the corolla length was only correlated to the robbing ***,we found that particular flowerpiercers species trans-ported higher loads of some plant pollen,which can be related to the differences in behavior and morphometric *** proposed the classification of five different types of plant-flowerpiercer interactions,that showed differ-ent potential mutualist or antagonist relations based on the affectation of nectar robbing and the service of pollen *** interaction networks consisted of 49 links,with 2.4 links per species,and presented indicators of a medium to high resilience,stability,and resistance(nestedness,connectance,and robustness).Also,the network presented medium to low specialization and substantial niche ***:The ecological role of

关键词： Diglossa flower traits Nectar robbing Nectivorous birds Pollen transport Pollination

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