Variations in bulk leaf carbon isotope discrimination, growth and related leaf traits among three Populus nigra L. populations
Variations in bulk leaf carbon isotope discrimination, growth and related leaf traits among three Populus nigra L. populations
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DOI：
10.1093/treephys/tpr089
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发表时间：
2011-10-01
期刊：
影响因子：
4
通讯作者：
Brignolas, Franck
中科院分区：
文献类型：
--
作者：
Chamaillard, Sylvain;Fichot, Regis;Brignolas, Franck
正在进行的全球变化可能是对欧洲黑杨的建立和长期生存的另一个威胁，一种象征性的欧洲河岸物种。为了深入了解该物种的适应潜力，我们（i）量化了三个法国黑猩猩种群内部和之间的关键生理属性的变化，即，水分利用效率（评估从散装叶片碳同位素歧视，Δ C-13），生长性能和相关的叶片性状，（ii）研究基因型和人口环境的相互作用，和（iii）探讨Δ C-13和生长之间的关系。在三个自然建立的种群中的每一个中取样30种基因型，并在两个不同的地点，奥尔良（ORL）和Guemene-Penfao（GMN）生长。在ORL中，建立了两个类似的地块，并采用不同的浇水制度，以测试干旱反应。观察到显着的变化，所有性状的种群内和种群之间，无论网站和浇水。群体内的性状变异大于群体间的性状变异。干旱的影响既不是基因型，也不依赖于人口，相反的网站的效果。人口排名保持在所有网站和浇水制度的两个最复杂的性状：三角洲C-13和增长。此外，这两个性状是不相关的，这表明（i）水分利用效率和生长在很大程度上是解耦的，在这个物种，和（ii）环境因素驱动的遗传结构的三角洲C-13和生长独立的行为。在种群内发现的大的变异与种群间的一致差异相结合，表明黑猩猩具有很大的适应潜力。
The ongoing global change could be an additional threat to the establishment and the long-term survival of Populus nigra L., an emblematic European riparian species. With the general aim of gaining insights into the adaptive potential of this species, we (i) quantified variations within and among three French P. nigra populations for key physiological attributes, i.e., water-use efficiency (assessed from bulk leaf carbon isotope discrimination, delta C-13), growth performance and related leaf traits, (ii) examined genotype and population by environment interactions, and (iii) explored the relationship between delta C-13 and growth. Thirty genotypes were sampled in each of three naturally established populations and grown in two different sites, Orleans (ORL) and Guemene-Penfao (GMN). In ORL, two similar plots were established and different watering regimes were applied in order to test for the drought response. Significant variations were observed for all traits within and among populations irrespective of site and watering. Trait variation was larger within than among populations. The effect of drought was neither genotype- nor population-dependent, contrary to the effect of site. The population ranking was maintained in all sites and watering regimes for the two most complex traits: delta C-13 and growth. Moreover, these two traits were unrelated, which indicates that (i) water-use efficiency and growth are largely uncoupled in this species, and (ii) the environmental factors driving genetic structuration for delta C-13 and growth act independently. The large variations found within populations combined with the consistent differences among populations suggest a large adaptive potential for P. nigra.