Effects of desiccation and CO2 concentrations on emersed photosynthesis in Porphyra haitanensis (Bangiales, Rhodophyta), a species farmed in China
Effects of desiccation and CO2 concentrations on emersed photosynthesis in Porphyra haitanensis (Bangiales, Rhodophyta), a species farmed in China
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DOI：
10.1017/s0967026202003876
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发表时间：
2002-11
影响因子：
2.4
通讯作者：
D. Zou;K. Gao
中科院分区：
文献类型：
--
作者：
D. Zou;K. Gao
研究了CO2对海地紫菜光合作用和脱水的影响，以确定低潮时大气CO2增加对海地紫菜的影响。随着干燥程度的提高，净光合作用、暗呼吸作用、光合效率、表观羧化效率和光饱和点降低，光补偿点和CO2补偿点升高。出现的净光合作用未被当前大气CO2水平（约350 ml m - 3）饱和，并且在中等干燥水平下，CO2浓度加倍（700 ml m - 3）使光合作用增加31%至89%。在较高的温度和较高的干燥程度下，700 ml m - 3 CO2下出现的净光合作用的相对增强更大。海棠紫菜的光合作用可能受益于大气中CO2浓度的增加。
The effects on photosynthesis of CO2 and desiccation in Porphyra haitanensis were investigated to establish the effects of increased atmospheric CO2 on this alga during emersion at low tides. With enhanced desiccation, net photosynthesis, dark respiration, photosynthetic efficiency, apparent carboxylating efficiency and light saturation point decreased, while the light compensation point and CO2 compensation point increased. Emersed net photosynthesis was not saturated by the present atmospheric CO2 level (about 350 ml m−3), and doubling the CO2 concentration (700 ml m−3) increased photosynthesis by between 31% and 89% at moderate levels of desiccation. The relative enhancement of emersed net photosynthesis at 700 ml m−3 CO2 was greater at higher temperatures and higher levels of desiccation. The photosynthetic production of Porphyra haitanensis may benefit from increasing atmospheric CO2 concentration during emersion.