An aerial green alga, Prasiola crispa (Lightf.) Menegh, which is known to form large colonies in Antarctic habitats, is subject to severe environmental stresses due to low temperature, draught and strong sunlight in summer. A considerable light-absorption by long-wavelength chlorophylls (LWC) at around 710 nm, which seem to consist of chlorophyll a, was detected in thallus of P. crispa harvested at a terrestrial environment in Antarctica. Absorption level at 710 nm against that at 680 nm was correlated with fluorescence emission intensity at 713 nm at room temperature and the 77 K fluorescence emission band from LWC was found to be emitted at 735 nm. We demonstrated that the LWC efficiently transfer excitation energy to photosystem II (PSII) reaction center from measurements of action spectra of photosynthetic oxygen evolution and P700 photo-oxidation. The global quantum yield of PSII excitation in thallus by far-red light was shown to be as high as by orange light, and the excitation balance between PSII and PSI was almost same in the two light sources. It is thus proposed that the LWC increase the photosynthetic productivity in the lower parts of overlapping thalli and contribute to the predominance of alga in the severe environment.

中文翻译：

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红移的叶绿素a带允许向上的能量转移到南极收获的空中绿藻Prasiola crispa中的光系统II反应中心。

空中绿藻Prasiola crispa（Lightf。）Menegh，已知在南极生境中形成大型殖民地，由于夏季的低温，吃水和强烈的阳光，会遭受严重的环境压力。在南极洲陆生环境中收获的P. crispa的all体中检测到大约710 nm处的长波叶绿素（LWC）吸收了相当多的光，该光似乎由叶绿素a组成。室温下710 nm处的吸收水平与680 nm处的吸收水平与713 nm处的荧光发射强度相关，并且发现LWC的77 K荧光发射带在735 nm处发射。我们证明了轻量级碳化物从光合作用氧释放和P700光氧化作用谱的测量有效地将激发能转移到光系统II（PSII）反应中心。研究表明，远红外光在th光中激发PSII的总体量子产率与橙光一样高，并且两种光源中PSII和PSI之间的激发平衡几乎相同。因此，有人提出，LWC可以增加重叠的塔利下部的光合生产力，并有助于在恶劣环境中藻类的优势。