Combined effects of light intensity and NH 4 + -enrichment on growth, pigmentation, and photosynthetic performance of Ulva prolifera (Chlorophyta)

Zhiguang Xu; Haiyi Wu; Dongmei Zhan; Fuxin Sun; Jianzhang Sun; Guangce Wang

doi:10.1007/s00343-014-3332-y

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Combined effects of light intensity and NH 4 + -enrichment on growth, pigmentation, and photosynthetic performance of Ulva prolifera (Chlorophyta)

Updated：2023-05-16

- Combined effects of light intensity and NH 4 + -enrichment on growth, pigmentation, and photosynthetic performance of Ulva prolifera (Chlorophyta)
- Journal of Oceanology and Limnology Vol. 32, Issue 5, Pages: 1016-1023(2014)
- Affiliations：
  
  1. Institute of Oceanology Chinese Academy of Sciences
  2. Marine Biology Institute of Shandong Province
  3. Macroalgae Engineering Technology Centre of Qingdao
  4. Yutian Group
- Author bio：
- Funds：
- DOI：10.1007/s00343-014-3332-y
  CLC：
- Online First：11 July 2014，
  
  Published：2014
- Accepted：
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Xu, Z., Wu, H., Zhan, D. et al. Combined effects of light intensity and NH, +4, , -enrichment on growth, pigmentation, and photosynthetic performance of Ulva prolifera (Chlorophyta)., Chin. J. Ocean. Limnol. 32, 1016–1023 (2014). https://doi.org/10.1007/s00343-014-3332-y
DOI：

Xu, Z., Wu, H., Zhan, D. et al. Combined effects of light intensity and NH, +4, , -enrichment on growth, pigmentation, and photosynthetic performance of Ulva prolifera (Chlorophyta)., Chin. J. Ocean. Limnol. 32, 1016–1023 (2014). https://doi.org/10.1007/s00343-014-3332-y DOI：

摘要

Abstract

The aim of this study was to investigate the effects of light intensity and enhanced nitrogen supply on the growth and photosynthesis of the green-tide macroalga

Ulva prolifera. Thalli of U. prolifera were grown in natural or NH 4 + -enriched seawater under two different light intensities for 7 days

and then the growth rate

pigmentation

and photosynthetic performance of the thalli were evaluated. The results show that the relative growth rate (RGR) was markedly higher under the high light level than under the low light level. Enrichment with NH 4 + enhanced the RGR under high light intensity

but did not affect RGR under low light intensity. In low light conditions

NH 4 + -enrichment resulted in a marked decrease in the maximal photosynthetic rate (P m) and the maximum carbon fixation rate (V max)

but it did not affect the half saturation constant for carbon (K 0.5) or the ratio of V max to K 0.5

which reflects the carbon acquisition efficiency. In high light conditions

P m

K 0.5

and the dark respiration rate (R d) increased under NH 4 + enrichment

but V max and the V max / K 0.5 ratio decreased. Regardless of the light intensity

NH 4 + -enrichment did not affect the apparent photosynthetic efficiency (α)

which reflects the ability of the alga to use light energy at low light levels. Under both low and high light intensities

the chlorophyll a (Chl a)

chlorophyll b (Chl b)

and carotenoids (Car) contents in thalli were higher in NH 4 + -enriched than in natural seawater

except that there was a decrease in the Chl b content of thalli in NH 4 + -enriched seawater under low light intensity. Therefore

NH 4 + enrichment improved the growth and photosynthetic performance of U. prolifera under high light intensity

but not under low light intensity. We discuss the possible mechanisms underlying these physiological responses.

关键词

Keywords

references

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