摘要
环境和遗传分化共同影响植物功能性状的种内变异,其研究对预测物种应对气候变化的适应性以及制定长期的保护策略至关重要.本研究利用同质园试验,分析了 14个不同种源鬼箭锦鸡儿幼苗的根、叶功能性状差异及其与种源地气候和地理因子的关系.结果表明:叶组织密度、比叶面积、叶长宽比、形态因子、叶绿素含量和叶片氮浓度以及根平均直径、比根长、比根面积、根氮浓度均存在显著的种内差异.其中,叶组织密度与根氮浓度是解释种源间叶片功能性状和根系功能性状分化的主要性状指标.根、叶功能性状间存在显著权衡关系,表现为比叶面积与叶组织密度、比根长与根组织密度、叶片氮浓度与根系氮浓度均呈显著负相关.种源地年均降水量、生长季降水量、海拔和地理因子(经度、纬度)是影响种内叶片功能性状变异的主要因素,海拔是影响种内根系功能性状变异的关键因素.
Abstract
Environmental and genetic differentiation jointly influence intra-specific variations of plant functional traits.Research on this topic is of great importance for the assessment plant adaptation to climate change and for developing long-term conservation strategies.In a common garden experiment,we investigated the variations in root and leaf functional traits of Caragana jubata across 14 provenances,as well as their relationships with the climatic and geographic factors of seed origin.The results showed that there were significant intraspecific differences in leaf tissue density,specific leaf area,leaf length to width ratio,leaf shape factor,leaf chlorophyll content,leaf nitrogen concentration,as well as root average diameter,specific root length,specific root area,and root nitrogen concen-tration.Leaf tissue density and root nitrogen concentration were key indicators explaining the differentiation of leaf and root functional traits across the various provenances.There were significant trade-offs among leaf and root func-tional traits,as indicated by the significant negative correlation between leaf area and leaf tissue density,between specific root length and root tissue density,as well as between leaf nitrogen concentration and root nitrogen concen-tration.Mean annual precipitation,growing season precipitation,altitude and geographical factors(longitude and latitude)of the seed origin played crucial roles in influencing intraspecific variation of leaf functional traits,while altitude dominantly accounted for the intraspecific variation of root functional traits.
维普
万方数据