Photosynthetic and fatty acid acclimation of four phytoplankton species in response to light intensity and phosphorus availability
Photosynthetic and fatty acid acclimation of four phytoplankton species in response to light intensity and phosphorus availability
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DOI：
10.1080/09670262.2015.1050068
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发表时间：
2015-06
影响因子：
2.4
通讯作者：
A. Wacker;Maike Piepho;E. Spijkerman
中科院分区：
文献类型：
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作者：
A. Wacker;Maike Piepho;E. Spijkerman
浮游植物对低辐射的光合适应可以通过增加对光的亲和力或增加天线尺寸和类囊体的堆叠等策略来实现。后者体现在较高比例的多不饱和脂肪酸（PUFAs）。此外，在弱光下，光合能力（Pmax）、呼吸损失和质子泄漏也会减少。本文研究了光强和磷有效性对四种浮游植物光合驯化和脂肪酸组成的影响。我们研究了温带湖泊浮游生物群落的重要组成部分——绿藻、隐藻和中藻的代表。在我们的分析中，除脂肪酸组成外，我们发现四尾绿藻、球形衣藻、卵形隐藻和meneghiniana绿藻的驯化策略不同。本研究观察了光磷条件对紫穗槐和紫穗槐光合能力的交互作用。ovata。哭了起来。卵形植物是一种弱光适应的物种，而四角草和Cyc则是一种弱光适应的物种。Meneghiniana可以最好地应对高光强和低磷供应的组合。主成分分析（PCA），包括脂肪酸组成，进一步显示了PUFAs和光照对Pmax调节的物种特异性模式。在四轴棘和环棘。meneghiniana， PUFAs负向影响Pmax与光的关系。的背影。较低的光照与较高的PUFAs和较低的Pmax相吻合，但PCA也表明PUFAs对Pmax没有直接影响。在Cry中，PUFAs和Pmax不受光的影响。ovata。我们没有观察到四个被测试物种的一般趋势，并得出结论，特别是，相互作用的影响突出了在评估光合适应低辐射时考虑多个环境因素的重要性。
Photosynthetic acclimation of phytoplankton to lower irradiation can be met by several strategies such as increasing the affinity for light or increasing antenna size and stacking of the thylakoids. The latter is reflected by a higher proportion of polyunsaturated fatty acids (PUFAs). Additionally, photosynthetic capacity (Pmax), respiratory losses, and proton leakage can be reduced under low light. Here we consider the effect of light intensity and phosphorus availability simultaneously on the photosynthetic acclimation and fatty acid composition of four phytoplankters. We studied representatives of the Chlorophyceae, Cryptophyceae and Mediophyceae, all of which are important components of plankton communities in temperate lakes. In our analysis, excluding fatty acid composition, we found different acclimation strategies in the chlorophytes Scenedesmus quadricauda, Chlamydomonas globosa, cryptophyte Cryptomonas ovata and ochrophyte Cyclotella meneghiniana. We observed interactive effects of light and phosphorus conditions on photosynthetic capacity in S. quadricauda and Cry. ovata. Cry. ovata can be characterized as a low light-acclimated species, whereas S. quadricauda and Cyc. meneghiniana can cope best with a combination of high light intensities and low phosphorus supply. Principal component analyses (PCA), including fatty acid composition, showed further species-specific patterns in their regulation of Pmax with PUFAs and light. In S. quadricauda and Cyc. meneghiniana, PUFAs negatively affected the relationship between Pmax and light. In Chl. globosa, lower light coincided with higher PUFAs and lower Pmax, but PCA also indicated that PUFAs had no direct influence on Pmax. PUFAs and Pmax were unaffected by light in Cry. ovata. We did not observe a general trend in the four species tested and concluded that, in particular, the interactive effects highlight the importance of taking into account more than one environmental factor when assessing photosynthetic acclimation to lower irradiation.