INHIBITION OF PHOTOSYNTHESIS BY CARBOHYDRATES IN WHEAT LEAVES
INHIBITION OF PHOTOSYNTHESIS BY CARBOHYDRATES IN WHEAT LEAVES
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DOI：
10.1104/pp.73.3.681
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发表时间：
1983-01-01
期刊：
影响因子：
7.4
通讯作者：
AZCONBIETO, J
中科院分区：
文献类型：
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作者：
AZCONBIETO, J
在低于25 ℃的温度下，成熟小麦叶片在环境空气（21%O2，340微巴[μ B] CO2）中的净CO2同化率随光照时间而下降。C，但在更高温度下则不然，并且当保持在具有更高CO2浓度（700-825 μ B）的空气中时，下降速率增加。在后一种情况下，净CO2同化率的下降也发生在高温下。气孔导度也随着时间的推移而下降，在某些情况下，气孔对CO2变得更加敏感，但这不是CO2同化减少的主要原因，因为CO2的内部分压保持不变。降低易位率的处理（例如，较低的温度，冷却的基础叶）产生了显着下降，在大气中的CO2和高CO2浓度的叶片的CO2同化。在每种情况下，减少净CO2同化与碳水化合物的积累，表明光合作用的最终产物抑制。在高碳水化合物叶片中的CO2同化作为细胞间CO2分压的函数的分析显示曲线的上部减少。然而，该曲线的初始斜率不受影响。在此曲线的上部的光合速率一般恢复后，在黑暗中的碳水化合物从叶中被删除的短时间。2%O2（瓦尔堡效应）对净CO2同化的刺激和表观量子产率在光照几小时后下降。
The rate of net CO2 assimilation of mature wheat leaves in ambient air (21% O2, 340 microbars [.mu.b] CO2) declined with time of illumination at temperatures lower than 25.degree. C, but not at higher temperatures, and the rate of decline increased when maintained in air with higher CO2 concentration (700-825 .mu.b). In this latter case, the decline in the rate of net CO2 assimilation also occurred at high temperatures. Stomatal conductance also declined with time in some cases and stomata became more sensitive to CO2, but this was not the primary cause of the decrease in CO2 assimilation because internal partial pressure of CO2 remained constant. Treatments which reduced the rate of translocation (e.g., lower temperatures, chilling the base of the leaf) produced a marked decline in CO2 assimilation of leaves in atmospheric and high CO2 concentrations. The decreased net CO2 assimilation was correlated with carbohydrate accumulation in each case, suggesting end product inhibition of photosynthesis. Analysis of CO2 assimilation in high carbohydrate leaves as a function of intercellular CO2 partial pressure showed reduction in the upper part of the curve. The initial slope of this curve, however, was not affected. Photosynthetic rates in the upper part of this curve generally recovered after a short period in darkness in which carbohydrates were removed from the leaf. The stimulation of net CO2 assimilation by 2% O2 (Warburg effect), and the apparent quantum yield, decreased after several hours of light.