Leaf respiration in light and darkness - A comparison of slow- and fast-growing Poa species
Leaf respiration in light and darkness - A comparison of slow- and fast-growing Poa species
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DOI：
10.1104/pp.113.3.961
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发表时间：
1997-03-01
期刊：
影响因子：
7.4
通讯作者：
Pons, TL
中科院分区：
文献类型：
--
作者：
Atkin, OK;Westbeek, MHM;Pons, TL
我们调查是否叶暗呼吸（非光呼吸线粒体CO2释放）抑制的权利，在几个早熟禾属物种，以及是否在光抑制物种之间的差异有关的差异，在叶片净光合速率。4个低地（Poa annua L.，扁穗早熟禾，草地早熟禾，和早熟禾（Poa trivialis L.），亚高山早熟禾（Poa alpina L.）和高山早熟禾Poa costiniana Vick.和Poa fawcettiae Vick.）在相同的控制条件下生长的早熟禾种不同的全株相对生长速率。根据Laisk方法估计光下非光呼吸线粒体CO2释放（R（d））。在环境CO2分压（35 Pa）和500 μ mol光子m（-2）s（-1）下测量光合作用。单位叶质量的光合速率与相对生长速率呈正相关，生长缓慢的高山早熟禾物种表现出最低的光合速率。在黑暗中的R（d）和呼吸速率也大大低于高山物种。所有物种在黑暗中的非光呼吸CO2释放量均高于R（d）。然而，尽管在光抑制呼吸的水平的物种之间的一些变化，没有观察到的抑制水平和光合速率之间的关系。同样，抑制水平与相对生长速率无关。我们的研究结果支持的建议，叶片呼吸率在光下是密切相关的速率在黑暗中。
We investigated whether leaf dark respiration (nonphotorespiratory mitochondrial CO2 release) is inhibited by right in several Poa species, and whether differences in light inhibition between the species ave related to differences in the rate of leaf net photosynthesis. Four lowland (Poa annua L., Poa compressa L., Poa pratensis L., and Poa trivialis L.), one subalpine (Poa alpina L.), and two alpine (Poa costiniana Vick. and Poa fawcettiae Vick.) Poa species differing in whole plant relative growth rates were grown under identical controlled conditions. Nonphotorespiratory mitochondrial CO2 release in the light (R(d)) was estimated according to the Laisk method. Photosynthesis was measured at ambient CO2 partial pressure (35 Pa) and 500 mu mol photons m(-2) s(-1). The rate of photosynthesis per unit leaf mass was positively correlated with the relative growth rate, with the slow-growing alpine Poa species exhibiting the lowest photosynthetic rates. Rates of both R(d) and respiration in darkness were also substantially lower in the alpine species. Nonphotorespiratory CO2 release in darkness was higher than R(d) in all species. However, despite some variation between the species in the level of light inhibition of respiration, no relationship was observed between the level of inhibition and the rate of photosynthesis. Similarly, the level of inhibition was not correlated with the relative growth rate. Our results support the suggestion that rates of leaf respiration in the light are closely associated with rates in darkness.