Algal density alleviates the elevated CO2-caused reduction on growth ofPorphyra haitanensis(Bangiales, Rhodophyta), a species farmed in China
Algal density alleviates the elevated CO2-caused reduction on growth ofPorphyra haitanensis(Bangiales, Rhodophyta), a species farmed in China
复制标题
藻类密度缓解了二氧化碳升高导致的坛紫菜（Bangiales，Rhodophyta）（一种在中国养殖的物种）生长的减少
DOI：
10.1111/are.14735
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发表时间：
2020
影响因子：
2
通讯作者：
Zou Dinghui
中科院分区：
文献类型：
--
作者：
Li Gang;Mai Guangming;Zhang Jiejun;Lin Qiang;Ni Guangyan;Tan Yehui;Huang Liangmin;Zou Dinghui
商业养殖的大型藻类--海坦比尔藻的生长通常会在自然生境中极大地增加它们的密度。为了探讨藻类密度的增加如何影响它们对二氧化碳增加的光合作用响应，我们比较了在pCO2水平(环境二氧化碳水平，400ppm；高二氧化碳水平，1000ppm)和生物量密度[低，1.0g鲜重(FW)L−1；中等，2.0g鲜重L−1；高，4.0g FW L−1]的情况下，海坦氏菌体的生长、细胞组成和光合作用。在低、中、高密度条件下，相对生长率分别为5.87%d−1、2.32%d−1和1.51%d−1，高浓度CO2使相对生长率分别降低27%、25%和12%。光系统II的最大光化学量子效率(Fv/Fm)、光利用效率(α)、饱和辐照度(EK)和最大相对电子传递速率(RETRmax)在低密度下均高于高密度下。CO2浓度升高使低密度组Fv/Fmin增加，但高密度组Fv/Fmin增加不明显，α、EK和rETRmax增加。此外，CO2浓度升高降低了叶绿素a的含量，提高了类胡萝卜素的含量，但对藻红蛋白、藻蓝蛋白和可溶性蛋白的影响不大。我们的结果表明，藻类密度的增加降低了藻类的生长和光合作用OFP，从而缓解了CO2升高对生长的负面影响和对光合作用的正面影响。此外，CO2浓度升高对植物生长的抑制和对光合作用的促进作用表明，CO2浓度升高可能通过释放有机物来增加光合作用产物的损失。
Growing ofPyropia haitanensis,a commercially farmed macroalga, usually increases their densities greatly during cultivation in natural habitats. To explore how the increased algal densities affect their photosynthetic responses to rising CO2, we compared the growth, cell components and photosynthesis of the thalli ofP. haitanensisunder a matrix of pCO2levels (ambient CO2, 400 ppm; elevated CO2, 1,000 ppm) and biomass densities [low, 1.0 g fresh weight (FW) L−1; medium, 2.0 g FW L−1; high, 4.0 g FW L−1]. Under ambient CO2, the relative growth rate (RGR) was 5.87% d−1, 2.32% d−1and 1.51% d−1in low, medium and high densities, and elevated CO2reduced the RGR by 27%, 25% and 12% respectively. Maximal photochemical quantum yield of photosystem II (FV/FM) was higher in low than in high densities, so were the light‐utilized efficiency (α), saturation irradiance (EK) and maximum relative electron transfer rate (rETRmax). Elevated CO2enhanced the FV/FMin low density but not in higher densities, as well as the α, EKand rETRmax. In addition, elevated CO2reduced the content of chlorophyll a and enhanced that of carotenoids, but unaffected phycoerythrin, phycocyanin and soluble proteins. Our results indicate that the increased algal densities reduced both the growth and the photosynthesis ofP. haitanensisand alleviated the elevated CO2‐induced negative impact on growth and positive impact on photosynthesis. Moreover, the elevated CO2‐induced reduction on growth and promotion on photosynthesis indicates that rising CO2may enhance the loss of photosynthetic products ofP. haitanensisthrough releasing organic matters.