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首页> 外文期刊>Flora >Photosynthetic acclimation and photoinhibition on exposure to high light in shade-developed leaves of Fagus crenata seedlings
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Photosynthetic acclimation and photoinhibition on exposure to high light in shade-developed leaves of Fagus crenata seedlings

机译：景天幼苗阴暗发育叶片的光合适应与光抑制。

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The physiological response of leaves developed in low light (L) on Fagus crenata seedlings exposed to different levels of high light (H: high light, M: medium light) was studied. Measurements were conducted on potted seedlings in the F crenata forest understory. The seedlings with leaves developed in L were transferred to H (L-H) and M (L-M) in summer. On exposure to high light, the photochemical efficiency of dark-adapted PSII (F-v/F-m) immediately decreased and was followed by a subsequent recovery in both L-H and L-M leaves. The mean value of F-v/F-m in L-H leaves was lower than that in L-M leaves through experiments, indicating that the degree of photoinhibition in L-H leaves was greater than that in L M leaves. About I month after transfer, 37% and 5% of leaves had fallen in L-H and L-M seedlings, respectively. This result also indicated the greater photoinhibition in L-H leaves. Moreover, the photosynthetic capacity (P-Nmax) of L H leaves decreased. In contrast, the P-Nmax of L-M leaves increased, although the P-Nmax was lower than that of M control leaves. An increase in the xanthophyll cycle pool (VAZ), indicating an increase of the photoprotective function, was found in both L-H and L-M leaves. Especially, the VAZ pool in L-M leaves was higher than that in M leaves by the end of experiments. L-M leaves may avoid photoinhibition effectively by the decrease in excess light with the increase of the P-Nmax or VAZ pool, compared to L-H leaves. Thus, the physiological acclimation on exposure to high light depended on the degree of high light. To achieve successful photosynthetic acclimation with slight photoinhibition, the variation of light intensity before and after exposure to high light would be an important factor because of the difference in excess light. (c) 2005 Elsevier GmbH. All rights reserved.
机译：研究了低光照（L）对暴露在不同水平的高光（H：高光，M：中光）下的青海杨幼苗的叶片的生理响应。在F Crenata森林底层的盆栽幼苗上进行测量。在L上长出叶子的幼苗在夏季移至H（L-H）和M（L-M）。暴露于高光下，适应深色的PSII（F-v / F-m）的光化学效率立即下降，随后在L-H和L-M叶片中均恢复。实验结果表明，L-H叶片的F-v / F-m平均值低于L-M叶片，表明L-H叶片的光抑制度大于L-M叶片。转移后约一个月，L-H和L-M幼苗的叶片分别下降了37％和5％。该结果还表明L-H叶片中更大的光抑制作用。此外，L H叶片的光合能力（P-Nmax）降低。相反，尽管L-M叶片的P-Nmax低于M对照叶片的P-Nmax，但P-Nmax有所增加。在L-H和L-M叶片中都发现叶黄素循环池（VAZ）的增加，表明光保护功能的增加。特别是，实验结束时，L-M叶片中的VAZ池高于M叶片中的VAZ池。与L-H叶片相比，L-M叶片可通过随P-Nmax或VAZ库的增加而减少过量光线来有效避免光抑制。因此，暴露于强光下的生理适应性取决于强光的程度。为了实现成功的光合作用和轻微的光抑制作用，由于过量光线的差异，暴露于强光之前和之后的光强度变化将是一个重要因素。 （c）2005 Elsevier GmbH。版权所有。

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