种群内和种群间小拟南芥植株营养含量的变化及协变格局研究

Study on Variation and Covariation Pattern of Seedling Nutrient Concentrations within and between Populations of Arabidopsis pumila

以拟南芥(Arabidopsisthaliana)近缘种小拟南芥(A.pumila)为试材,研究了新疆玛河流域6个种群内和种群间植株N、P、K、Na、Ca、Mg、Fe、Zn、Cu、Mn含量的变化格局。发现10种元素含量在种群间达到极显著差异,Na、Ca、Mg、Fe、Zn含量在种群内和种群间均变化较大,是小拟南芥适应异质环境变化较大的一类元素,而N、P、K、Cu、Mn含量在种群内变化较稳定;种群内植株营养成分含量的双重协变数量3～6对,K与Ca、Na,Na与Zn在6个种群内均表现出正相关,其中K与Ca在5个种群中相关显著;主成分分析发现6个种群的植株营养成分含量都是由3个较大载荷构成,占原变量总方差的83.9%～91.4%,K与Ca、Na在5个种群统一表现出相似的整合格局,但共同主成分分析发现种群间营养成分含量协方差矩阵彼此独立,缺乏共性。认为K与Ca、Na的整合性可能是小拟南芥在新疆土壤类型多样条件下广布的重要原因,但这种整合格局是否是小拟南芥营养元素的普遍整合特点有待在更大尺度下进一步验证。

Patterns of within and between populations variation in concentrations of nutrients(N, P, K, Na, Ca, Mg, Fe, Cu, Mn, Zn) are reported in mature individual seedling of Arabidopsis pumila, the phylogenetic neighbourhood of A. thaliana from six populations in Mahe drainage basin Xingjiang Autonomous Region. Results show that difference of ten element concentrations of between-population is significant. There are various difference traits within and between populations in concentrations of nutrients because A. pumila has strong phenotypic plasticity to respond to the stress of a vary of habitants and local water, light and salina in soil, concentrations of Na, Ca, Mg, Fe, Zn show similar variation pattern within and between populations, which are key changeable elements to respond to heterogeneous environment for A. pumila. Differences of N, P, K, Cu, Mn concentration are stable relatively within population. The power for detec-ting significant correlations within population is limited, merely attain 3-6 pairs. The positive correlation between Na and Zn, K and Ca, K and Na concentrations consistently occur in all po-pulations,and K and Ca is significant correlation in five populations.Principle component analysis discovers the number of explanatory PCs are all compose of three loadings, account for supplementary 83.9%-91.4%. K, Ca and Na consistently indicate the positive correlation with PCs in five populations. From these results, it is inferred that this integration pattern may be main reason that A.pumila is abundance in Xinjiang area which is salina and drought. However,common principal component analysis indicates that nutrient covariance matrices were unrelated among populations, this multivariate pattern isn't regarded as common integration characters of A. pumila in all populations until research in larger scale.