Endemic Species Research Institute, Jiji, Nantou, Taiwan.
Tree Physiol. 2012 May;32(5):535-44. doi: 10.1093/treephys/tps037. Epub 2012 Apr 26.
We aimed to understand the relation of photosynthetic rate (A) with g(s) and electron transport rate (ETR) in species of great taxonomic range and light adaptation capability during photosynthetic light induction. We studied three woody species (Alnus formosana, Ardisia crenata and Ardisia cornudentata) and four fern species (Pyrrosia lingus, Asplenium antiquum, Diplazium donianum and Archangiopteris somai) with different light adaptation capabilities. Pot-grown materials received 100 and/or 10% sunlight according to their light adaptation capabilities. At least 4 months after light acclimation, CO(2) and H(2)O exchange and chlorophyll fluorescence were measured simultaneously by equipment in the laboratory. In plants adapted or acclimated to low light, dark-adapted leaves exposed to 500 or 2000 µmol m(-2) s(-1) photosynthetic photon flux (PPF) for 30 min showed low gross photosynthetic rate (P(g)) and short time required to reach 90% of maximum P(g) (). At the initiation of illumination, two broad-leaved understory shrubs and the four ferns, especially ferns adapted to heavy shade, showed higher stomatal conductance (g(s)) than pioneer tree species; materials with higher g(s) had short at both 500 and 2000 µmol m(-2) s(-1) PPF. With 500 or 2000 µmol m(-2) s(-1) PPF, the g(s) for the three woody species increased from 2 to 30 min after the start of illumination, but little change in the g(s) of the four ferns. Thus, P(g) and g(s) were not correlated for all material measured at the same PPF and induction time. However, P(g) was positively correlated with ETR, even though CO(2) assimilation may be influenced by stomatal, biochemical and photoinhibitory limitations. In addition, was closely related to time required to reach 90% maximal ETR for all materials and with two levels of PPF combined. Thus, ETR is a good indicator for estimating the light induction of photosynthetic rate of species, across a wide taxonomic range and light adaptation and acclimation capability.
我们的目的是了解光合速率（A）与 g(s) 和电子传递速率（ETR）在具有广泛分类范围和光适应能力的物种中的关系，在光合作用光诱导期间。我们研究了三种木本物种（Alnus formosana、Ardisia crenata 和 Ardisia cornudentata）和四种蕨类植物（Pyrrosia lingus、Asplenium antiquum、Diplazium donianum 和 Archangiopteris somai），它们具有不同的光适应能力。根据其光适应能力，盆栽材料接收 100 和/或 10%的阳光。在光驯化至少 4 个月后，通过实验室设备同时测量 CO(2)和 H(2)O 交换和叶绿素荧光。在适应或驯化到低光的植物中，黑暗适应的叶子暴露在 500 或 2000 µmol m(-2) s(-1) 光合光子通量 (PPF) 下 30 分钟，显示出低总光合速率 (P(g)) 和达到 90%最大 P(g)所需的时间短 ( )。在光照开始时，两种阔叶林下灌木和四种蕨类植物，尤其是适应重荫的蕨类植物，表现出比先锋树种更高的气孔导度 (g(s))；具有更高 g(s)的材料在 500 和 2000 µmol m(-2) s(-1) PPF 下均具有短时间。用 500 或 2000 µmol m(-2) s(-1) PPF，三种木本植物的 g(s)从光照开始后 2 到 30 分钟增加，但四种蕨类植物的 g(s)几乎没有变化。因此，在相同的 PPF 和诱导时间下测量的所有材料的 P(g)和 g(s)之间没有相关性。然而，即使 CO(2)同化可能受到气孔、生化和光抑制限制，P(g)也与 ETR 呈正相关。此外，与所有材料达到 90%最大 ETR 所需的时间密切相关，与两种 PPF 水平相结合。因此，ETR 是估计物种光合速率光诱导的良好指标，适用于广泛的分类范围和光适应和驯化能力。
