Short‐ and long‐term acclimation patterns of the giant kelp Macrocystis pyrifera (Laminariales, Phaeophyceae) along a depth gradient
Short‐ and long‐term acclimation patterns of the giant kelp Macrocystis pyrifera (Laminariales, Phaeophyceae) along a depth gradient
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巨型海带Macrocystis Pyrifera（海带目、褐藻纲）沿深度梯度的短期和长期驯化模式
DOI：
10.1111/jpy.12394
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发表时间：
2016
影响因子：
2.9
通讯作者：
K. Bischof
中科院分区：
文献类型：
--
作者：
K. Koch;M. Thiel;W. Hagen;M. Graeve;I. Gómez;D. Jofre;L. Hofmann;F. Tala;K. Bischof
巨藻（Macrocystis pyrifera）暴露在其地理和垂直深度梯度中高度变化的辐照度和温度制度下。本研究的目的是将我们对不同时间尺度的藻类适应策略的理解扩展到不同水深的不同非生物条件下。不同采样时间（2012年1 / 2月和8 / 9月，长期驯化）对不同水深（0.2、2和4 m）的适应策略不同，移植14 d内对不同水深（0.2、2和4 m，短期驯化）的适应策略更快。不同的Chl - a荧光、色素组成（Chl - c、岩藻黄素）和叶黄素循环色素的去环氧化状态的调整是在不同太阳辐射和温度气候下形成不同生理状态的原因。有趣的是，研究结果表明，叶绿素单宁在长期驯化中起重要作用，而抗氧化剂在短期驯化中起关键作用。此外，总脂质和脂肪酸组成的变化也可能在深度驯化中起作用。8 / 9月（南方冬季），m . pyrifera对深度从4 m到0.2 m的移植有响应，饱和程度上升，脂肪酸从短链转向长链。这些变化似乎对类囊体膜的重新调整至关重要，因此可能促进在不断变化的光照和温度下进行有效的光合作用。太阳辐射、温度和其他非生物参数在观察到的生理变化中的相对贡献需要进一步的实验来解开。
The giant kelp, Macrocystis pyrifera, is exposed to highly variable irradiance and temperature regimes across its geographic and vertical depth gradients. The objective of this study was to extend our understanding of algal acclimation strategies on different temporal scales to those varying abiotic conditions at various water depths. Different acclimation strategies to various water depths (0.2 and 4 m) between different sampling times (Jan/Feb and Aug/Sept 2012; long‐term acclimation) and more rapid adjustments to different depths (0.2, 2 and 4 m; short‐term acclimation) during 14 d of transplantation were found. Adjustments of variable Chl a fluorescence, pigment composition (Chl c, fucoxanthin), and the de‐epoxidation state of the xanthophyll cycle pigments were responsible for the development of different physiological states with respect to various solar radiation and temperature climates. Interestingly, the results indicated that phlorotannins are important during long‐term acclimation while antioxidants have a crucial role during short‐term acclimation. Furthermore, the results suggested that modifications in total lipids and fatty acid compositions apparently also might play a role in depth acclimation. In Aug/Sept (austral winter), M. pyrifera responded to the transplantation from 4 m to 0.2 m depth with a rise in the degree of saturation and a switch from shorter‐ to longer‐chain fatty acids. These changes seem to be essential for the readjustment of thylakoid membranes and might, thus, facilitate efficient photosynthesis under changing irradiances and temperatures. Further experiments are needed to disentangle the relative contribution of solar radiation, temperature and also other abiotic parameters in the observed physiological changes.