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高光, 吴红艳, 高坤山. 阳光紫外辐射对褐藻羊栖菜生长和光合作用的影响[J]. 水生生物学报, 2009, 33(2): 284-288.
引用本文: 高光, 吴红艳, 高坤山. 阳光紫外辐射对褐藻羊栖菜生长和光合作用的影响[J]. 水生生物学报, 2009, 33(2): 284-288.
GAO Guang, WU Hong-Yan, GAO Kun-Shan. EFFECTS OF SOLAR ULTRAVIOLET RADIATION ON GROWTH AND PHOTOSYNTHESIS OF HIZIKIA FUSIFORMIS[J]. ACTA HYDROBIOLOGICA SINICA, 2009, 33(2): 284-288.
Citation: GAO Guang, WU Hong-Yan, GAO Kun-Shan. EFFECTS OF SOLAR ULTRAVIOLET RADIATION ON GROWTH AND PHOTOSYNTHESIS OF HIZIKIA FUSIFORMIS[J]. ACTA HYDROBIOLOGICA SINICA, 2009, 33(2): 284-288.

阳光紫外辐射对褐藻羊栖菜生长和光合作用的影响

EFFECTS OF SOLAR ULTRAVIOLET RADIATION ON GROWTH AND PHOTOSYNTHESIS OF HIZIKIA FUSIFORMIS

  • 摘要: 为探讨经济褐藻羊栖菜对阳光紫外辐射变化的响应,我们在全波段阳光辐射(280-700nm),去除UV-B辐射(320-700nm)以及光合有效辐射PAR(400-700nm)3种辐射条件下对其进行培养,测定了其光合作用与生长的变化。羊栖菜的生长是通过每两天测量一次藻体的湿重来测定的,光合放氧是用Clark型氧电极测定的,为了测定藻体叶绿素a和紫外吸收物质的含量,从250nm到750nm对羊栖菜的甲醇提取液进行扫描,叶绿素a的浓度用Porra的公式计算,紫外吸收物质的计算是根据Dunlap的方法先计算紫外吸收物质和叶绿素a的比率,然后乘以每单位藻体叶绿素a的含量。结果表明,当藻体接收较多的日辐射量时有较高的相对生长速率,当滤除UVR后,较高的太阳辐射也导致了较高的光合放氧。然而太阳紫外辐射能够抑制藻体的光合放氧和生长速率,降低叶绿素a的浓度,并且这种抑制作用随着辐射水平的升高而增强。此外,阳光紫外辐射也诱导产生了一定量的紫外吸收物质,但并不足以抵抗紫外辐射对藻体的伤害作用。

     

    Abstract: Effects of solar ultraviolet radiation(UVR) on the growth and photosynthesis of the economic brown alga Hizikia fusiformis were investigated while exposed to full spectrum solar radiation(280-700 nm),solar radiation depleted of UV-B(320-700 nm) and solar radiation deprived of total UVR(400-700 nm) in order to understand its responses to changes in solar UVR.The growth of H.fusiformis was determined by weighting the fresh algae every two days and the photosynthetic oxygen evolution was assayed by a Clark-type oxygen electrode.To determine the contents of chlorophyll a and UV-absorbing compounds(UVAC),methanol extracts from H.fusiformis were scanned from 250 to 750 nm.The concentration of chlorophyll a was calculated using the equation of Porra and the contents of UVAC per fresh mass were estimated by determining the ratio of UVAC to chlorophyll a according to Dunlap et al and multiplying the ratio of chlorophyll a content to fresh weight of the sample used.It was found that the relative growth rate was higher when algae received more daily doses and higher levels of solar irradiances depleted of UVR also led to higher photosynthetic oxygen evolution.However,solar UVR could inhibit the photosynthetic oxygen evolution and growth rate and decrease the content of chlorophyll a of H.fusiformis and higher levels of solar UVR irradiances or doses led to higher inhibitory effects.Although ultraviolet-absorbing compounds were induced by solar ultraviolet radiation,they could not fully counteract the damage to H.fusiformis induced by UVR

     

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