Photosynthetic capacity and pigment distribution of a siphonous green alga, Dichotomosiphon tuberosus.

IF 2.9 3区 生物学 Q2 PLANT SCIENCES
Soichiro Seki, Koichi Kobayashi, Ritsuko Fujii
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引用次数: 0

Abstract

Dichotomosiphon tuberosus is one of the Bryopsidales, a siphonous, unicellular multinucleate ulvophyte. Bryopsidales typically occur in the ocean and contain unique carbonyl carotenoids siphonaxanthin (Sx) and its ester siphonein (Sn) in their major light-harvesting pigment-protein complexes, allowing them to utilize the green light available in the deep ocean for photosynthesis. However, unlike other Bryopsidales, D. tuberosus occurs in fresh water and is reported to contain Sn but not Sx. D. tuberosus inhabits deep lakes around the world, but in Okinawa, Japan, it inhabits very shallow waterways. Here, we measured the photosynthetic capacity of D. tuberosus collected from Okinawa waterway and compared it with another intertidal Bryopsidale Codium fragile. D. tuberosus had higher photosynthetic electron transport capacity and stronger non-photochemical quenching than C. fragile, consistent with the brighter growth environments for D. tuberosus than C. fragile. We also measured the absorption spectra and the pigment compositions within the photosynthetic pigment-protein complexes from D. tuberosus. Green light absorption of each complex in D. tuberosus was weaker than that in C. fragile. In contrast, Chl b absorption in LHCII was stronger in D. tuberosus than in C. fragile, whereas the opposite was true in photosystems. This implies that a large proportion of the irradiated energy is absorbed by LHCII complex and quenched more efficiently. Our results indicate that the photosynthetic capacity of D. tuberosus is further optimized for higher light environments compared with C. fragile.

一种虹吸绿藻的光合能力和色素分布。
双歧虫属是苔藓类植物之一,是一种虹吸、单细胞、多核的苔藓植物。苔藓植物通常生长在海洋中,其主要的光收集色素-蛋白质复合物中含有独特的羰基类胡萝卜素虹膜黄质(Sx)及其酯虹膜黄质(Sn),使它们能够利用深海中的绿光进行光合作用。然而,与其他苔藓植物不同,D. tuberosus存在于淡水中,据报道含有Sn而不含Sx。D. tuberosus生活在世界各地的深湖,但在日本冲绳,它生活在非常浅的水道。在这里,我们测量了从冲绳水道收集的D. tuberosus的光合能力,并将其与另一种潮间带苔藓藻Codium脆性进行了比较。与易碎香薷相比,龙须香薷具有更高的光合电子传递能力和更强的非光化学猝灭,这与龙须香薷比易碎香椿生长环境更亮一致。测定了紫苏光合色素-蛋白复合物的吸收光谱和色素组成。各复合物对绿光的吸收均弱于易碎草。相反,Chl b的LHCII吸收在D. tuberosus中强于C. fragile,而在光系统中则相反。这表明大部分辐照能量被LHCII配合物吸收并更有效地淬火。结果表明,在高光照环境下,龙须草的光合能力比易碎龙须草更优。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Photosynthesis Research
Photosynthesis Research 生物-植物科学
CiteScore
6.90
自引率
8.10%
发文量
91
审稿时长
4.5 months
期刊介绍: Photosynthesis Research is an international journal open to papers of merit dealing with both basic and applied aspects of photosynthesis. It covers all aspects of photosynthesis research, including, but not limited to, light absorption and emission, excitation energy transfer, primary photochemistry, model systems, membrane components, protein complexes, electron transport, photophosphorylation, carbon assimilation, regulatory phenomena, molecular biology, environmental and ecological aspects, photorespiration, and bacterial and algal photosynthesis.
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