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二氧化碳加富与阳光紫外辐射对球形棕囊藻的耦合效应

, PP. 155-162

Keywords: 二氧化碳,紫外辐射,生长,光化效率,球形棕囊藻

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Abstract:

在含有和滤除紫外(UV)辐射(UVR,280~400nm)的阳光条件下,向静止、恒温的培养体系中分别充含390×10-6和800×10-6体积CO2的空气,以期探讨CO2浓度升高与阳光UV辐射对球形棕囊藻(PhaeocystisglobosaScherffel)的生理生态学影响。结果显示,该藻对CO2加富和UVR的响应与细胞密度密切相关。在细胞密度较低时,CO2加富导致生长和有效光化学效率分别下降了11.0%和10.7%,UVR对两者的抑制率分别达19.2%和41.7%。在细胞密度较高时,CO2加富和UVR的影响明显减小,UVR的存在甚至导致生长速率的增加。UVR降低了该藻的最大电子传递速率及光能利用效率,在周围空气下分别达14.1%和21.0%,CO2加富使其进一步下降,分别达8.2%和17.6%。细胞Chla和Chlc及类胡萝卜素含量在高CO2条件下显著增加(达4.6%,5.9%和5.2%);UVR导致类胡萝素含量升高(达4.3%)。结果表明,在阳光辐射下,CO2加富导致球形棕囊藻抵御强光及UVR胁迫能力下降,其对此的生化响应是增加具有保护作用的类胡萝卜素的含量。

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