Diurnal variation in relative photosynthetic performance in giant kelp Macrocystis pyrifera (Phaeophyceae, Laminariales) at different depths as estimated using PAM fluorometry

被引:51
作者
Edwards, Matthew S. [1 ]
Kim, Kwang Young [2 ]
机构
[1] San Diego State Univ, Dept Biol, San Diego, CA 92182 USA
[2] Chonnam Natl Univ, Dept Oceanog, Kwangju 500757, South Korea
关键词
Light-adapted; Macrocystis pyrifera; Photo acclimation; Photosynthesis; Photosystem II; Pulse-amplitude modulated fluorescence (PAM); Shade-adapted; RAPID LIGHT CURVES; ELECTRON-TRANSPORT; ULTRAVIOLET-RADIATION; SPECIES COMPOSITION; PHOTOINHIBITION; MACROALGAE; RESPONSES; DESICCATION; POLAR;
D O I
10.1016/j.aquabot.2009.10.017
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Pulse-amplitude modulated (PAM) fluorometry allows instantaneous estimates of photosynthetic rates, but may well produce variable measurements of photosynthetic activity depending on time of day, recent light history, internal fluctuations, and environmental variability. To investigate this, we compare estimates of diurnal variability in relative photosynthetic performance for the giant kelp, Macrocystis pyrifera (L.) C. Agardh, obtained from PAM fluorometry at three depths during 3 days characterized by different light conditions, and for two different blade ages. Sampling in the mid morning, late morning, early afternoon and late afternoon, we examined diurnal changes in relative photosynthetic performance in meristematic tissue and older blades occurring near the bottom, in the mid water, and at the water surface. Measures of maximum relative electron transport rates (rETR(max)) minimum saturating irradiance (E-k), photosynthetic efficiency (alpha) and maximum quantum yield (F-v/F-m) show that giant kelp blades in the mid water and near the bottom exhibit little to no photosynthetic changes during the day. Near the surface, however, blades exhibit photosynthetic characteristics similar to light-adapted species in that they begin the day acclimated to low light, acclimate to increasing irradiance during the day, and end the day acclimated to low light. Consequently, while estimates of rETR(max) were highest during the midday for all sample depths and days, they were also always highest near the surface for both old blades (112.16 +/- 8.7, 98.6 +/- 14.7, 70.16 +/- 5.7) and meristematic tissue (109.0 +/- 9.0, 86.9 +/- 1.9, 59.2 +/- 11.6, surface, mid water and bottom, respectively). Similar patterns were observed for E-k for both old blades (169.2 +/- 5.4, 88.0 +/- 11.2, 83.8 +/- 5.2) and meristematic tissue (138.4 +/- 11.5, 96.6 +/- 4.69, 68.4 +/- 10.6). In contrast, estimates of F-v/F-m were lowest near the surface during the midday for both old blades (0.6 +/- 0.02, 0.73 +/- 0.69, 0.75 +/- 0.01) and meristematic tissue (0.58 +/- 0.02, 0.69 +/- 0.05, 0.74 +/- 0.01, surface, mid water and bottom, respectively). These patterns coincided with similar patterns in ambient light, which was most variable and reached its greatest values near the surface during the midday. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:119 / 128
页数:10
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