Impacts of elevated ozone and nitrogen on growth and photosynthesis of European aspen (Populus tremula) and hybrid aspen (P-tremula x Populus tremuloides) clones
Impacts of elevated ozone and nitrogen on growth and photosynthesis of European aspen (Populus tremula) and hybrid aspen (P-tremula x Populus tremuloides) clones
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DOI：
10.1139/x07-084
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发表时间：
2007-11-01
影响因子：
2.2
通讯作者：
Oksanen, Elina
中科院分区：
文献类型：
--
作者：
Haikio, Elina;Freiwald, Vera;Oksanen, Elina
对流层臭氧升高和土壤氮素添加对两种欧洲本土白杨（Populus tremula L.）和8种杂交白杨（P. tremula L.）x Populus tremuloides Michx.）在自由空气臭氧暴露系统中研究克隆。盆栽树苗暴露于环境（约。20 ppb）或1.5 x环境臭氧和两个水平的土壤氮（第一年低氮和高氮处理分别为39和78 kg N. ha（-1）. year（-1），第二年60和140 kg N. ha（-1）. year（-1）））。测量植物的光合作用、叶绿素荧光和生物量积累。臭氧降低叶级净光合作用（A（sat）），特别是在生长季节的早期和最大量子产率的光系统II（F-V/F-M）在生长季节结束。施氮促进了植物各部分的生长，减轻了臭氧的不利影响。有显着差异的克隆之间的臭氧反应，我们能够聚类的克隆到敏感性组的基础上，他们的生长反应。最耐臭氧的ggenotypes是杂交白杨克隆，表明人口已经经历了臭氧耐受基因型的选择，应用于杂交与臭氧敏感的人口，以实现对气候的耐受性与对流层臭氧浓度增加。
Impacts of elevated tropospheric ozone and soil nitrogen amendment on two native European aspen (Populus tremula L.) and eight hybrid aspen (P. tremula L. x Populus tremuloides Michx.) clones were studied in a free-air ozone exposure system. Potted saplings were exposed to ambient (ca. 20 ppb) or 1.5 x ambient ozone and two levels of soil nitrogen (39 and 78 kg N.ha(-1).year(-1) in the first year, 60 and 140 kg N.ha(-1).year(-1) in the second year for low-nitrogen and high-nitrogen treatments, respectively) over two growing seasons. The plants were measured for photosynthesis, chlorophyll fluorescence, and biomass accumulation. Ozone decreased leaf-level net photosynthesis (A(sat)) in particular early in the growing season and maximum quantum yield of photosystem II (F-v/F-m) at the end of the growing season. Nitrogen amendment increased the growth of all plant parts and mitigated the adverse ozone effects. There were significant differences in ozone responses among the clones, and we were able to cluster the clones into sensitivity groups based on their growth responses. The most ozone-tolerant ggenotypes were hybrid aspen clones, indicating that populations that have already experienced selection for ozone-tolerant genotypes should be used to cross-breed with ozone-sensitive populations to achieve tolerance of a climate with increasing tropospheric ozone concentrations.