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Dispersal and germination of winged seeds of Brandisia hancei,a shrub in karst regions of China

Plant Diversity 2021年第3期43卷 234-238页

作者： Yongquan Ren Chengling Huang Jiaming Zhang Yongpeng Ma Xiaoling Tian College of Eco-Environmental Engineering Guizhou Minzu UniversityGuiyang 550025China Yunnan Key Laboratory for Integrative Conservation of Plant Species with Extremely Small Populations Kunming Institute of BotanyKunming 650201China The College of Humanities and Science of Guizhou Minzu University Guiyang 550025China

Brandisia hancei(Paulowniaceae)is a widely distributed shrub in karst regions in southwestern *** seeds have a membranous wing,and they mature just before the rainy season *** assess the effect of the wing on seed dispersal and germination of ***,we measured the dispersal distance at varying wind speeds and release heights,falling duration from different release heights,floating duration on still water,rates of imbibition of water,and drying and soil adherence to *** experiments were conducted on intact and de-winged seeds immediately after *** wing increased the falling duration in still air and the floating ability on *** distance of winged and de-winged seeds did not differ at a wind speed of 2.8 m s1,but at 3.6 and 4.0 m s1 dispersal distances were greater for de-winged than for winged *** wing had little effect of absorption and retention of water,but significantly increased soil adherence to the *** seeds were non-dormant and germinated to over 90%with a mean germination time of about 10 *** combining the environmental conditions in karst habitat with the seed traits of ***,we conclude that dispersal and germination of winged seeds are adapted to the precipitation seasonality in heterogeneous habitats absence of soil.

关键词： Anemochory Hydrochory Membranous wing seed dispersal winged seed

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Effects of seed morphology and orientation on secondary seed dispersal by wind

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Journal of Plant Ecology 2022年第6期15卷 1257-1272页

作者： Jinlei Zhu Carsten M.Buchmann Frank M.Schurr Institute of Landscape and Plant Ecology University of Hohenheim70599 StuttgartGermany

Understanding how diaspore(hereafter‘seed’)morphology and orientation affect secondary seed dispersal by wind is important to link seed dispersal and post-dispersal processes,such as seed lodging,predation and *** study aims to describe the effects of seed morphology and orientation on secondary seed dispersal by wind via mechanistic *** extend the mechanistic model of Schurr et al.(2005)in order to describe how secondary seed dispersal by wind is affected by wind conditions,ground surface,seed morphology and *** model simulates the initial landing orientations,dispersal distances and stopping orientations of individual *** parameterize the model,we measured orientation-specific vertical seed projection and seed lift-off velocity(the wind speed at which a seed starts moving on the ground)of the asymmetric seeds of heterocarpous Zygophyllum xanthoxylon,and determined orientation-specific model parameters that depend on properties of seeds and/or the *** validate the model,we conducted wind channel experiments in which we released seeds of *** onto a sand-coated tar paper,and recorded the initial landing orientations,dispersal distances and stopping orientations of the *** extended model could precisely predict secondary dispersal distance,and explain up to 99%of variation in the observed proportions of seeds which stopped in various *** model predicts that secondary dispersal distance increases with wind speed and decreases with aerodynamic roughness length,and that there might be a positive correlation between dispersal distance and germination success.

关键词： Zygophyllum xanthoxyllon heterodiaspory mechanistic modelling phase II dispersal seed orientation tumbleweed winged seed

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