Journal of Tropical Oceanography >
Comparative study on photophysiology of four macroalgae from the Zhongsha Atoll, with special reference to the effects of temperature rise*
Copy editor: LIN Qiang
Received date: 2021-08-18
Revised date: 2021-10-08
Online published: 2021-10-12
Supported by
National Science & Technology Fundamental Resources Investigation Program(2018FY100104)
National Natural Science Foundation(41890853)
Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)(GML2019ZD0407)
Natural Science Foundation of Guangdong Province(2022A1515011461)
Science and Technology Planning Project of Guangdong Province(2017B020217002)
Macroalgae, together with corals, provide faunal foods and habitats in clear tropical waters, maintaining the rich biological diversity in coral reefs. In this paper, we compared biochemical compositions and photosynthetic features, as well as photophysiological responses to temperature rise of two red algae (i.e., Grateloupia ellipitica and Liagora samaensis) and two green algae (i.e., Udotea flabellum and Halimeda discoidea), the dominating macroalgae species in the Zhongsha Atoll of the South China Sea. Results showed that the red algae contain less chlorophyll a and carotenoids than the green ones, but contain the unique phycoerythrin and phycocyanin. Both the light compensation point (EC) and dark respiration (Rd) of the red algae are lower than the green algae. The temperature rise enhances EC, Rd and light utilization efficiency (α), as well as the daily carbon fixation of both red and green algae; and it lowers the saturation irradiance (EK) of the former algae species but enhances the maximum photosynthetic oxygen evolution rate (Pmax) of the later species. Moreover, the temperature rise enhances the photosynthetic rate of the red algae under lower light, but reduces it under higher light, while such temperature-induced enhancement on the photosynthetic rate of the green algae occurs throughout the measured light range. Considering the inter-specific photophysiological characteristics of the four macroalgae as well as the effects of temperature, the temperature rise would benefit the photosynthesis of macroalgae in the Zhongsha Atoll and benefit the red algae better than the green algae.
LI Gang , WAN Mingyue , SHI Xiaohan , QIN Geng , MAI Guangming , HUANG Liangmin , TAN Yehui , ZOU Dinghui . Comparative study on photophysiology of four macroalgae from the Zhongsha Atoll, with special reference to the effects of temperature rise*[J]. Journal of Tropical Oceanography, 2022 , 41(3) : 101 -110 . DOI: 10.11978/2021105
表1 4种大型海藻藻体色素与蛋白含量Tab. 1 Pigments of chlorophyll a (Chl a), carotenoids (Car), phycoerythrin (PE), phycocyanin (PC), and soluble proteins (SP) contents (mg·g-1 FW) in G. ellipitica, L. samaensis, U. flabellum, and H. discoidea. Shown are the mean and standard deviation of three or four independent measurements (n=3 or 4) |
色素 | 蛋白含量/(mg·g-1 FW) | |||
---|---|---|---|---|
厚膜藻G. ellipitica | 粉枝藻L. samaensis | 钙扇藻U. flabellum | 仙掌藻H. discoidea | |
叶绿素a(Chl a) | 0.03±0.006a | 0.08±0.005a | 0.36±0.068b | 0.16±0.034c |
类胡萝卜素(Car) | 0.004±0.001a | 0.034±0.005b | 0.26±0.056c | 0.14±0.029d |
藻红蛋白(PE) | 0.65±0.021a | 0.010±0.008b | — | — |
藻蓝蛋白(PC) | 0.004±0.003a | 0.009±0.001b | — | — |
可溶性蛋白(SP) | 1.12±0.087a | 1.25±0.383a | 5.17±0.533b | 1.28±0.197a |
注: 上标不同字母表示差异性显著(P<0.05) |
图2 原位温度和升温条件下4种大型海藻的光响应(P-E)曲线a. 厚膜藻; b. 粉枝藻; c. 钙扇藻; d. 仙掌藻 Fig. 2 Photosynthetic oxygen evolution rate (µmol O2·g-1 FW·h-1) versus irradiance (µmol·photons·m-2·s-1) (P vs. E) curves under ambient (29.5℃) and elevated temperatures (33.5℃) for (a) G. ellipitica, (b) L. samaensis, (c) U. flabellum, and (d) H. discoidea. Symbols show the averaged values of three or four independent measurements; vertical bars indicate standard deviation (n=3 or 4), often fall within the symbols |
图3 原位温度(29.5℃)和升温(33.5℃)条件下4种大型海藻的光合生理参数不同字母表示差异性显著(P<0.05) Fig. 3 P vs. E curve-derived photosynthetic parameters under ambient (29.5℃) and elevated (33.5℃) temperatures for G. ellipitica, L. samaensis, U. flabellum, and H. discoidea. The letter above each bar indicates significant difference (P<0.05) |
图4 原位温度(29.5℃)和升温(33.5℃)条件下4种大型海藻光补偿点变化不同字母表示差异性显著(P<0.05) Fig. 4 Light compensation point (EC, µmol·photons·m-2·s-1) under ambient (29.5℃) and elevated temperatures (33.5℃) for G. ellipitica, L. samaensis, U. flabellum and H. discoidea. Vertical bar indicates a standard deviation (n=3 or 4); the letter on top of each bar indicates the significant difference (P<0.05) |
图5 原位温度(29.5℃)和升温(33.5℃)条件下4种大型海藻暗呼吸速率变化不同字母表示差异性显著(P<0.05) Fig. 5 Dark respiration (Rd; µmol O2·g-1 FW·h-1) of G. ellipitica, L. samaensis, U. flabellum, and H. discoidea under ambient (29.5℃) and elevated (33.5℃) temperatures. Vertical bar indicates standard deviation (n=3 or 4), and the letter indicates significant difference (P<0.05) |
图6 原位温度和升温条件下四种大型海藻的日净光合固碳量变化不同字母表示差异性显著(P<0.05) Fig. 6 Daily carbon fixation (mg C·g-1 FW·d-1) of G. ellipitica, L. samaensis, U. flabellum, and H. discoidea under ambient (29.5℃) and elevated (33.5℃) temperatures. Vertical bar indicates standard deviation (n = 3 or 4), and the letter indicates significant difference (P<0.05) |
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