Influence of growth temperature and measuring temperature on isoprene emission, diffusive limitations of photosynthesis and respiration in hybrid poplars
Influence of growth temperature and measuring temperature on isoprene emission, diffusive limitations of photosynthesis and respiration in hybrid poplars
复制标题
DOI：
10.1016/j.atmosenv.2010.09.036
复制
发表时间：
2011-01-01
影响因子：
5
通讯作者：
Centritto, Mauro
中科院分区：
文献类型：
--
作者：
Fares, Silvano;Mahmood, Tariq;Centritto, Mauro
短句来源比较了25℃、35℃和35℃条件下生长1年的杨树和欧美树苗的光合作用(A)、气孔（g(s)）和叶肉（g(m)）导度、光（R-L）和暗（R-D）呼吸和异戊二烯排放在不同温度下的同化和直接响应，结果表明：35℃条件下A、g(s)和g(m)显著降低；比在其他生长温度下。这导致这些参数在测量温度范围内向下驯化。R-L和R-D也表现出明显的向下驯化。但随着温度的升高，呼吸与光合作用的比值逐渐增大，在所有测量温度下，R-L和R-D对生长温度的响应均大于A。在不断变化的气候条件下，这种类型的驯化将导致光合作用和呼吸作用之间的碳平衡发生变化。异戊二烯释放量受温度处理影响较大，表现出对高温的向下驯化。呼吸和异戊二烯排放率直接相关，独立于生长和测量温度。这些发现可能与预测在全球变化的环境条件下类异戊二烯的排放有关。(C) 2010 Elsevier Ltd.版权所有。
Acclimatory and direct responses of photosynthesis (A), stomatal (g(s)) and mesophyll (g(m)) conductance, light (R-L) and dark (R-D) respiration, and isoprene emission, measured at different temperatures, were compared in one-year-old Populus x euramericana saplings grown at 25 degrees C, 35 degrees C, and in the saplings grown initially at 35 degrees C and then exposed for two weeks at 25 degrees C. Results show that A, g(s) and g(m) were significantly lower at 35 degrees C, than at the other growth temperatures. This resulted in a downward acclimation of these parameters over the range of measuring temperatures. Both R-L and R-D also showed a considerable downward acclimation. However, the respiration to photosynthesis ratio increased with high temperatures, for R-L and R-D were more responsive to increasing growth temperatures than A at all measuring temperatures. This type of acclimation would lead to a shift in the carbon balance between photosynthesis and respiration under changing climatic conditions. Isoprene emission was greatly affected by temperature treatments and showed a downward acclimation to higher temperatures. Respiration and isoprene emission rates were directly related, independently of growth and measuring temperatures. These findings may be likely relevant to predict the emissions of isoprenoid in globally changing environmental conditions. (C) 2010 Elsevier Ltd. All rights reserved.