Dynamic acclimation to sunlight in an alpine plant, Soldanella alpina L.
Dynamic acclimation to sunlight in an alpine plant, Soldanella alpina L.
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高山植物 Soldanella apina L. 对阳光的动态适应。
DOI：
10.1111/ppl.12982
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发表时间：
2020
影响因子：
6.4
通讯作者：
P. Streb
中科院分区：
文献类型：
--
作者：
Anne;S. Meyer;X. Baudin;P. Streb
在法国阿尔卑斯山，高山松藻Soldanella alpina（S.高山植物）在生长期在荫凉和阳光条件下生长。本种被调查的模式，在自然高山条件下，在光合作用和叶片解剖学的阴叶对太阳的动态驯化。阳生叶的光合活性仅略高于阴生叶。结果表明，阳坡叶片厚度、气孔密度和表皮类黄酮含量显著高于阴坡，叶绿素/类黄酮比值显著低于阴坡。阳生叶也有更多的氧化质体醌库，其PSII效率在光下更高，其非光化学猝灭（NPQ）能力高于阴生叶。与遮荫叶片相比，遮荫转阳叶片的叶片厚度、气孔密度和表皮类黄酮含量增加，但光合活性和叶绿素/类黄酮比值下降。参数表明保护高光和氧化胁迫，如NPQ和抗坏血酸过氧化物酶，增加阴阳转移叶片和叶片死亡率增加。结果表明，S.高山植物叶片在高山条件下对强光的适应主要涉及叶片的解剖特征和表皮黄酮类化合物的适应，以及抗氧化保护的增加。然而，这种增加不足以防止在胁迫条件下的损害和更换受损的叶片。
In the French Alps, Soldanella alpina (S. alpina) grow under shade and sun conditions during the vegetation period. This species was investigated as a model for the dynamic acclimation of shade leaves to the sun under natural alpine conditions, in terms of photosynthesis and leaf anatomy. Photosynthetic activity in sun leaves was only slightly higher than in shade leaves. The leaf thickness, the stomatal density and the epidermal flavonoid content were markedly higher, and the chlorophyll/flavonoid ratio was significantly lower in sun than in shade leaves. Sun leaves also had a more oxidised plastoquinone pool, their PSII efficiency in light was higher and their non-photochemical quenching (NPQ) capacity was higher than that of shade leaves. Shade-sun transferred leaves increased their leaf thickness, stomatal density and epidermal flavonoid content, while their photosynthetic activity and chlorophyll/flavonoid ratio declined compared to shade leaves. Parameters indicating protection against high light and oxidative stress, such as NPQ and ascorbate peroxidase, increased in shade-sun transferred leaves and leaf mortality increased. We conclude that the dynamic acclimation of S. alpina leaves to high light under alpine conditions mainly concerns anatomical features and epidermal flavonoid acclimation, as well as an increase in antioxidative protection. However, this increase is not large enough to prevent damage under stress conditions and to replace damaged leaves.