EFFECTS OF GROWTH TEMPERATURE ON THE RESPONSES OF RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE, ELECTRON-TRANSPORT COMPONENTS, AND SUCROSE SYNTHESIS ENZYMES TO LEAF NITROGEN IN RICE, AND THEIR RELATIONSHIPS TO PHOTOSYNTHESIS
EFFECTS OF GROWTH TEMPERATURE ON THE RESPONSES OF RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE, ELECTRON-TRANSPORT COMPONENTS, AND SUCROSE SYNTHESIS ENZYMES TO LEAF NITROGEN IN RICE, AND THEIR RELATIONSHIPS TO PHOTOSYNTHESIS
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DOI：
10.1104/pp.105.4.1231
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发表时间：
1994-08-01
期刊：
影响因子：
7.4
通讯作者：
MAE, T
中科院分区：
文献类型：
--
作者：
MAKINO, A;NAKANO, H;MAE, T
研究了生长温度对水稻（Oryza sativa L.）幼叶光合气体交换速率及其生化特性的影响。植物在18/15 ℃、23/18 ℃和30/23 ℃的昼夜温度条件下水培生长，所有光合作用测量均在25 ℃的叶温和1800 μ mol quanta m（-2）s（-1）的辐照度下进行。生长温度影响光合CO2响应曲线。初始斜率与CO2饱和光合速率的相对比值随生长温度的升高而增大。这主要是由于增加CO2限制光合作用为一个给定的叶片氮含量与生长温度的上升。然而，核酮糖-1，5-二磷酸羧化酶（Rubisco）含量在任何给定的叶片氮含量之间的温度处理没有差异。此外，Rubisco的活化状态和催化转换速率不受生长温度的影响。随着生长温度的升高，CO2限制光合作用的增加是细胞间空气空间和羧化位点之间的CO2传递电导增加的结果。随着生长温度的升高，叶片氮含量相同的总叶绿素和捕光叶绿素蛋白II的量增加，但细胞色素f和偶联因子1的量以及细胞溶质果糖-1，6-二磷酸酶和蔗糖磷酸合成酶的活性在23/18摄氏度和30/23摄氏度生长的植物之间是相同的。同样，对于相同的叶片氮含量，这些处理之间的CO2饱和光合作用没有差异。对于18/15摄氏度生长的植物，细胞色素f和偶联因子1的量略有减少，细胞溶质果糖-1，6-二磷酸酶和蔗糖磷酸合酶的活性增加，但这些都没有反映在CO2饱和的光合作用。
Effects of growth temperature on the photosynthetic gas-exchange rates and their underlying biochemical properties were examined in young, fully expanded leaves of rice (Oryza sativa L.). The plants were grown hydroponically under day/night temperature regimes of 18/15 degrees C, 23/18 degrees C, and 30/23 degrees C and all photosynthetic measurements were made at a leaf temperature of 25 degrees C and an irradiance of 1800 mu mol quanta m(-2) s(-1). Growth temperature affected the photosynthetic CO2 response curve. The relative ratio of the initial slope to the CO2-saturated photosynthesis increased with rising growth temperature. This was caused mainly by an increase in CO2-limited photosynthesis for a given leaf nitrogen content with rising growth temperature. However, there was no difference in ribulose-1,5-bisphosphate carboxylase (Rubisco) content at any given leaf nitrogen content among temperature treatments. In addition, the activation state and catalytic turnover rate of Rubisco were not affected by growth temperature. The increase in CO2-limited photosynthesis with rising growth temperature was the result of an increase in the CO2 transfer conductance between the intercellular airspaces and the carboxylation sites. The amounts of total chlorophyll and light-harvesting chlorophyll alb protein II increased for the same leaf nitrogen content with rising growth temperature, but the amounts of cytochrome f and coupling factor 1 and the activities of cytosolic fructose-1,6-bisphosphatase and sucrose-phosphate synthase were the same between plants grown at 23/18 degrees C and those grown at 30/23 degrees C. similarly, CO2-saturated photosynthesis was not different for the same leaf nitrogen content between these treatments. For the 18/15 degrees C-grown plants, a slight decrease in the amounts of cytochrome f and coupling factor 1 and an increase in the activities of cytosolic fructose-1,6-bisphosphatase and sucrose-phosphate synthase were found, but these were not reflected in CO2-saturated photosynthesis.