广西植物Issue(3)：331-337,7.DOI:10.11931/guihaia.gxzw201311053
基于根系形态可塑性的空心莲子草克隆分工特征
Division of labor in Alternanthera philoxeroides based root morphological plasticity
摘要
Abstract
The distribution of resources is uneven over space and time,which always leads to heterogeneous patches. Clonal plants usually occupy wider habitats because of powerful clonal growth and the physical connection between ramets promotes the adaptation to heterogeneous habitats.Clonal ramets can improve resource capture capacity in nu-trient-rich patches by the functional specializing of resource acquisition organs,then share these resources with the ramets in low nutrient patches through clonal integration,this pattern is called ‘division of labor’.Our study selected Alternanthera philoxeroides ,an invasive clonal weed,as the objective and studied on the morphological plasticity of roots in the heterogeneous patches of resources.Ramets were planted in the patches with heterogeneous distribution of light and soil nutrient and there were four treatments,e.g.①two ramets experienced high light and low nutrienttreatment(HL-HL); ② two ramets experienced low light intensity and high nutrient treatment (LH-LH );③proximal ramets experienced high light and low nutrient treatment,distal ramets experienced low light and high nutrient treatment(HL-LH);④proximal ramets experienced low light and high nutrient treatment,distal ramets experienced high light low nutrient treatment(LH-HL).Parameters of roots were analyzed with WinRHIZO Pro software and the effect of treatment on these parameters of proximal ramets,distal ramets and whole ramet pairs was tested with one-way ANOVA(SPSS 18.0).Our results were as follows:Ramets in high light and low nutrient patch allocated more biomass to aboveground parts,while ramets experienced low light and high nutrient allocated more bi-omass to the underground parts.A .philoxeroides ramets showed the division of labor by changing the root-shoot ratio of biomass.In heterogeneous environments,the root of A .philoxeroides ramets in the eutrophic patches had higher root biomass,root length,root surface area,root volume and branch coefficient,etc.A .philoxeroides in-creased nutrient uptake capacity through the form of root morphological plasticity in heterogeneity habitats.Thus,A . philoxeroides improved resource absorption capacity by specializing resource acquisition organs,which may play an important role in its successful invasion.关键词
空心莲子草/异质性斑块/克隆分工/根系/形态可塑性Key words
Alternanthera philoxeroides/heterogeneous patch/the division of labor/root/morphological plasticity分类
农业科技引用本文复制引用
郑朋秦,黄思倩,宋会兴..基于根系形态可塑性的空心莲子草克隆分工特征[J].广西植物,2015,(3):331-337,7.基金项目
国家“十二五”科技支撑计划项目(2011BAC09B05) （2011BAC09B05）
中国博士后基金(2013M531976) （2013M531976）
