Photosynthetic downregulation in leaves of the Japanese white birch grown under elevated CO(2) concentration does not change their temperature-dependent susceptibility to photoinhibition.
Photosynthetic downregulation in leaves of the Japanese white birch grown under elevated CO(2) concentration does not change their temperature-dependent susceptibility to photoinhibition.
复制标题
在升高的 CO(2) 浓度下生长的日本白桦叶片的光合下调不会改变其对光抑制的温度依赖性敏感性。
DOI：
10.1111/j.1399-3054.2012.01651.x
复制
发表时间：
2013
影响因子：
6.4
通讯作者：
M. Kitao
中科院分区：
文献类型：
--
作者：
Masabumi Komatsu;H. Tobita;Makoto Watanabe;K. Yazaki;T. Koike;M. Kitao
为了确定CO(2)浓度升高对光合作用特性的影响，测定了不同叶温(15、20、25、30、35和40℃)下一年生白桦幼苗的气体交换和叶绿素荧光。在自然日光下的人工气候室中，生长在两个[CO(2)]水平(环境：400微克分子(-1)和升高：800微克分子(-1))和有限的氮素有效性(90毫克氮素植物(-1))下。生长在高[CO(2)]下的植物表现出光合作用的下调，这表现为Rubisco的羧化能力降低。在30℃以上的温度下，CO(2)浓度升高的植株的净光合速率高于生长在环境[CO(2)]下的植株。在低于25℃的温度下，高CO(2)处理植株的电子传递速率显著低于常温CO(2)处理植株，但在整个温度范围内，不同CO(2)处理之间的过剩光能比例[(1-Q(P))×F(V)‘/F(M)’]没有显著差异。当CO(2)浓度低于25℃时，CO(2)浓度升高引起的非光化学能量损失的量子效率显著高于环境温度。这些结果表明，浓度升高的CO(2)诱导的光抑制效应可能不会加剧光抑制的温度敏感性，因为低温下增加的热能耗散补偿了由电子传递减少的能量消耗。
To determine the effects of elevated CO(2) concentration ([CO(2)]) on the temperature-dependent photosynthetic properties, we measured gas exchange and chlorophyll fluorescence at various leaf temperatures (15, 20, 25, 30, 35 and 40°C) in 1-year-old seedlings of the Japanese white birch (Betula platyphylla var. japonica), grown in a phytotron under natural daylight at two [CO(2)] levels (ambient: 400 µmol mol(-1) and elevated: 800 µmol mol(-1)) and limited N availability (90 mg N plant(-1)). Plants grown under elevated [CO(2)] exhibited photosynthetic downregulation, indicated by a decrease in the carboxylation capacity of Rubisco. At temperatures above 30°C, the net photosynthetic rates of elevated-CO(2)-grown plants exceeded those grown under ambient [CO(2)] when compared at their growth [CO(2)]. Electron transport rates were significantly lower in elevated-CO(2)-grown plants than ambient-CO(2)-grown ones at temperatures below 25°C. However, no significant difference was observed in the fraction of excess light energy [(1 - q(P))× F(v)'/F(m)'] between CO(2) treatments across the temperature range. The quantum yield of regulated non-photochemical energy loss was significantly higher in elevated-CO(2)-grown plants than ambient, when compared at their respective growth [CO(2)] below 25°C. These results suggest that elevated-CO(2)-induced downregulation might not exacerbate the temperature-dependent susceptibility to photoinhibition, because reduced energy consumption by electron transport was compensated for by increased thermal energy dissipation at low temperatures.
影响因子：
6.9
作者：
Hikosaka, K;Ishikawa, K;Onoda, Y
通讯作者：
Onoda, Y
CO_2升高和营养限制限制日本白桦(Betula platyphylla var. japonica)叶片光系统II激发能量耗散
DOI：
--
发表时间：
2005
期刊：
Physiological Plantarum 125
影响因子：
--
作者：
Kitao;M.;Koike;T.;Tobita;H.;Maruyama;Y.
通讯作者：
Y.
影响因子：
6.4
作者：
Kitao, M;Utsugi, H;Lihpai, S
通讯作者：
Lihpai, S