Differences In The Effects Of Trans-generational Plasticity Of Invasive Alien Species Wedelia Trilobata(L.) Hitchc And Their Native Species Wedelia.Chinensis(Osbeck.) Merr On Morphological And Physiological Characteristics

Plant mothers can transmit information about the living environment and its complex changes to their offspring,causing subsequent changes in their representativeness,which affect their offspring's fitness to the environment,which is called the adaptability of transgenerational plasticity.In the natural state,plants with the same genetic composition and potential independent viability offspring offspring produced by asexual reproduction are called cloned plants.At present,research on plant transgenerational plasticity is mainly focused on non-clonal plants that reproduce sexually,and focuses on plant growth and reproduction characteristics such as seed number,seed size,and seed quality.Related research are lacking of transgenerational plasticity affects the morphology and photosynthetic physiological performance of plant progeny.This study takes the stoloniferous clone plants Wedelia.Chinensis?Osbeck.?Merr and Wedelia trilobata?L.?Hitchc as research objects,and aims to answer the following scientific questions:?1?Are there difference in transgenerational plasticity between invasive species and their native species??2?Does the invasive species show greater transgenerational plasticity than their native species?Clonal plants produce asexual individuals with potential independent viability through asexual reproduction,ramets.Firstly,16 ramets of similar size and sage roots were collected from Chengdu,Sichuan,and half of them were treated with full light?labeled G?,and the other half were shaded?50%full light,labeled Z?.All the ramets produced within 10 weeks are regarded as the F₀ generation;Secondly,from the F₀ generation under full light treatment,rooting ramets of similar size were selected for full light and shade?50%full light?treatment,respectively.Similarly,from the F₀ generation under shade?50%full light?treatment,rooting ramets of similar size were selected for full light and shade?50%full light?treatments,respectively.All the ramets produced within 10 weeks were treated as F₁ generation;The experimental treatment combination includes:F₀ full light+F₁ full light?GG?,F₀ full light+F₁ shade?GZ?,F₀ shade+F₁ full light?ZG?,F₀ shade+F₁ shade?ZZ?.In this experiment,the following indicators were measured for the F₀and F₁ offsprings of the native species and the invasive species:Total number of ramets,total stolon length,total leaf number,and root,stolon,leaf biomass and distribution performance;Morphological characteristics such as leaf area,specific leaf area,total stolon length,and prostrate stem length,etc;photosynthetic physiological manifestations such as leaf nitrogen content,leaf chlorophyll content,and potential maximum net photosynthetic rate.The main results are as follows:There are no significant difference in stem,leaf,total biomass,leaf biomass/total biomass,leaf area,potential maximum net photosynthesis rate under native F₀ light+F₁shade?GZ?treatment and under F₀ shade+F₁ shade?ZZ?treatment;Compared with invasive species treated with F₀ light+F₁ shade?GZ?,stems biomass,leaves biomass,total biomass,leaf biomass/total biomass,leaf area,and potential maximum net photosynthetic rate under F₀ shade+F₁ shade?ZZ?treatment increased significantly;Compared with native species under F₀ generation light+F₁ shade?GZ?treatment,root biomass/above-ground biomass under F₀ generation shade+F₁ shade?ZZ?treatment increased significantly;Compared with the invasive species under F₀ generation light+F₁ shade?GZ?treatment,the root biomass/above-ground biomass under F₀ generation+F₁ shade?ZZ?treatment increased significantly,and the increase of invasive species is larger than native species.In this paper,different light treatments were used to study the transgenerational plasticity of stoloniferous herb Wedelia.Chinensis?Osbeck.?Merr and Wedelia trilobata?L.?Hitchc in two aspects,including morphological characteristics and photosynthetic physiological performance.Compared with F₁ generation F₀ plants that received full light treatment,F₀ generation shading treatment significantly enhanced F₁ generation plants'ability to capture light resources and use efficiency.The transgenerational plasticity of invasive species and their native species is different.Moreover,compared with native species of the same genus,invasive species show greater transgenerational plasticity,which significantly improves the fitness of F₁ generation in shade or full-light environments,which not only enriches and develops research on transgenerational plasticity of cloned plants.It also advances the understanding of the relationship between invasive plants and their transgenerational plasticity.