高CO_(2)浓度下经济海藻羊栖菜与附生石莼的光合特性比较  

Photosynthetic comparison between economic seaweed Sargassum fusiforme and epiphytic Ulva lactuca under high CO_(2)concentration

作　　者：曹聪 马增岭[1,2] 吴明江[1,2] 徐丽丽 陈斌斌 CAO Cong;MA Zengling;WU Mingjiang;XU Lili;CHEN Binbin(College of Life and Environmental Science,Wenzhou University,Wenzhou Zhejiang 325035,China;Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection,Sargassum Fusiforme Research Institute,Wenzhou University,Wenzhou Zhejiang 325035,China)

机构地区：[1]温州大学生命与环境科学学院,浙江温州325035 [2]温州大学羊栖菜研究所,浙江省水环境与海洋生物资源保护重点实验室,浙江温州325035

出　　处：《海洋渔业》2024年第4期459-472,共14页Marine Fisheries

基　　金：国家重点研发计划项目(No.2018YFD0901500);国家自然科学基金项目(No.41706147,No.41876124)。

摘　　要：为了解大气CO_(2)浓度升高和附生杂藻竞争对羊栖菜(Sargassum fusiforme)生长与光合作用的影响,选择羊栖菜主要附生海藻石莼(Ulva lactuca)为对照,比较了在单独培养与共培养条件下两者的光合特性。结果显示,在单独培养条件下,高CO_(2)浓度提高了羊栖菜的最大电子传递速率(rETRm),降低了羊栖菜的暗呼吸速率(Rd)与总光合速率(Pg)的比值,但对石莼的Rd与Rd/Pg的比值无显著影响。瞬时高温(25℃)对羊栖菜的最大量子产率(Fv/Fm)和rETRm的抑制作用均显著高于石莼。在共培养条件下,羊栖菜的光合活性受到抑制,并显著低于石莼,而石莼的rETRm受到的影响并不显著;而且在共培养时,羊栖菜的Fv/Fm、rETRm和净光合速率(Pn)在瞬时高温(25℃)时均明显下降,而Rd达到最大,且其Q10值要高于石莼;瞬时温度变化对石莼rETRm无显著影响。研究表明,高CO_(2)浓度可以提高羊栖菜的光合作用,但是对石莼的影响不显著。羊栖菜光合作用与呼吸作用对温度变化更为敏感,而石莼有较强的适应温度变化的能力,特别是在共培养条件下表现出种间竞争优势。To understand the effects of elevated atmospheric CO_(2)concentration and competition of epiphytic algae on the growth and photosynthesis of Sargassum fusiforme,S.fusiforme and its main epiphytic macroalgae Ulva lactuca were used to compare their photosynthetic characteristics after monoculture and bi-culture treatments.The results showed that,in monoculture,high CO_(2)concentration increased the maximum electron transfer rate(rETRm)of S.fusiforme,but decreased its dark respiration rate(Rd)and ratio of dark respiration rate to total photosynthetic rate(Pg),whereas the Rd and Rd/Pg ratio of U.lactuca was not significantly affected.Additionally,the inhibitory effect of transient high temperature(25℃)on the maximum quantum yield(F v/F m)and rETRm of photosystemⅡ(PSⅡ)of S.fusiforme was significantly higher than that of U.lactuca.In bi-culture,the photosynthetic activity of S.fusiforme was inhibited and significantly lower than that of U.lactuca,and the rETRm of U.lactuca was not significantly affected.Moreover,when the transient temperature was 25℃,S.fusiforme grown in biculture condition had the lowest values of rETRm,Fv/Fm and net photosynthetic rate(Pn)and the highest values of Rd.Moreover,the Q 10 value of Rd of S.fusiforme was higher than that of U.lactuca.In bi-culture,the change of transient temperature exhibited no significant effect on the rETRm of U.lactuca.This study showed that high CO_(2)concentration improved the photosynthetic capacity of S.fusiforme but had no significant effect on the photosynthetic capacity of U.lactuca.The photosynthesis and respiration of S.fusiforme were sensitive to temperature changes,while U.lactuca had ability to adapt to temperature rising,showing interspecific competitive advantage under bi-culture condition.

关 键 词：羊栖菜 石莼 光合作用 气候变化 海藻养殖 

分 类 号：S917[农业科学—水产科学]