Elevated CO2 and temperature alter nitrogen allocation in Douglas‐fir
Elevated CO2 and temperature alter nitrogen allocation in Douglas‐fir
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DOI：
10.1046/j.1365-2486.2003.00646.x
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发表时间：
2003-07
影响因子：
11.6
通讯作者：
D. Tingey;R. McKane;D. Olszyk;Mark G. Johnson;P. Rygiewicz;E. Henry Lee
中科院分区：
文献类型：
--
作者：
D. Tingey;R. McKane;D. Olszyk;Mark G. Johnson;P. Rygiewicz;E. Henry Lee
研究了CO2浓度升高和温度升高对花旗松针叶、木质部（茎、枝）和根组织中主要碳组分（PCC）及C、N分配的影响。佛朗哥幼苗确定。幼苗在含有原生土壤的阳光照射的受控环境室中生长。对灭菌室进行控制，以重现环境温度或环境温度+180 ppm CO2和环境温度或环境温度+3.5 ℃，持续4年。没有显著的CO2 ×温度相互作用;因此，提供了CO2和温度效应的数据。在最终收获时，升高的CO2降低了PCC的非极性部分，并增加了针叶中的极性部分和糖的量。相反，升高的温度增加了PCC的非极性部分，并降低了针叶中的糖。有没有CO2或温度对PCC组分在木质组织或根组织的影响。升高CO2和温度对任何植物组织或组分的C含量没有显着影响。与此相反，叶片氮含量下降，CO2浓度升高和升高温度下增加，有在其他组织中没有显着的影响。叶片氮浓度的变化是在纤维素和木质素组分，组分，其中含有蛋白质，是氮分配的变化的后果下的治疗。这些结果表明，N在植物器官之间的重新分配，以优化C同化，这是通过改变Rubisco的选择性和碳水化合物调节基因表达介导的。
The effects of elevated CO2 and temperature on principal carbon constituents (PCC) and C and N allocation between needle, woody (stem and branches) and root tissue of Pseudotsuga menziesii Mirb. Franco seedlings were determined. The seedlings were grown in sun‐lit controlled‐environment chambers that contained a native soil. Chambers were controlled to reproduce ambient or ambient +180 ppm CO2 and either ambient temperature or ambient +3.5 °C for 4 years. There were no significant CO2 × temperature interactions; consequently the data are presented for the CO2 and temperature effects. At the final harvest, elevated CO2 decreased the nonpolar fraction of the PCC and increased the polar fraction and amount of sugars in the needles. In contrast, elevated temperature increased the nonpolar fraction of the PCC and decreased sugars in needles. There were no CO2 or temperature effects on the PCC fractions in the woody tissue or root tissue. Elevated CO2 and temperature had no significant effects on the C content of any of the plant tissues or fractions. In contrast, the foliar N content declined under elevated CO2 and increased under elevated temperature; there were no significant effects in other tissues. The changes in the foliar N concentrations were in the cellulose and lignin fractions, the fractions, which contain protein, and are the consequences of changes in N allocation under the treatments. These results indicate reallocation of N among plant organs to optimize C assimilation, which is mediated via changes in the selectivity of Rubisco and carbohydrate modulation of gene expression.