Behavioral and physiological photoresponses to light intensity by intertidal microphytobenthos

Guoying DU; Hongmei YAN; Chunrong LIU; Yunxiang MAO

doi:10.1007/s00343-017-6099-0

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Behavioral and physiological photoresponses to light intensity by intertidal microphytobenthos

Ecology | Updated：2023-05-19

- Behavioral and physiological photoresponses to light intensity by intertidal microphytobenthos
- Chinese Journal of Oceanology and Limnology Vol. 36, Issue 2, Pages: 293-304(2018)
- Affiliations：
  
  Key Laboratory of Marine Genetics and Breeding, Ocean University of China, Ministry of Education, Qingdao 266003, China
- Author bio：
  
  MAO Yunxiang, yxmao@ouc.edu.cn
- Funds：
- DOI：10.1007/s00343-017-6099-0
  CLC：
- Received：28 April 2016，
  
  Accepted：14 July 2016，
  
  Online First：15 November 2016，
  
  Published：2018-03
- Accepted：
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Guoying DU, Hongmei YAN, Chunrong LIU, et al. Behavioral and physiological photoresponses to light intensity by intertidal microphytobenthos[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(2): 293-304.
DOI：

Guoying DU, Hongmei YAN, Chunrong LIU, et al. Behavioral and physiological photoresponses to light intensity by intertidal microphytobenthos[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(2): 293-304. DOI： 10.1007/s00343-017-6099-0.

摘要

Abstract

Behavioral and physiological responses to light are the two major mechanisms by which natural microphytobenthic assemblages adapt to the intertidal environment and protect themselves from light stress. The present study investigated these photoresponses with different light intensities over 8 h of illumination

and used a specific inhibitor (Latrunculin A

Lat A) for migration to compare migratory and non-migratory microphytobenthos (MPB). Photosynthetic activity was detected using rapid light curves and induction curves by chlorophyll fluorescence. It showed distinct variation in migratory responses to different light intensities; high light induced downward migration to avoid photoinhibition

and low and medium light (50-250 μmol/(m

·s)) promoted upward migration followed by downward migration after certain period of light exposure. No significant difference in non-photochemical quenching (NPQ) or PSⅡ maximal quantum yield (

) was detected between low and medium light irradiance

possibly indicating that only high light influences the photosynthetic capability of MPB. Decreased photosynthetic activity

indicated by three parameters

the maximum relative electron transport rate (rETR

max

)

minimum saturating irradiance (

) and light utilization coefficient (

)

was observed in MPB after exposure to prolonged illumination under low and medium light. Lat A effectively inhibited the migration of MPB in all light treatments and induced lower

under high light (500 and 100 μmol/(m

·s)) and prolonged illumination at 250 μmol/(m

·s)

but did not significantly influence

under low light (0-100 μmol/(m

·s)) or NPQ. The increase of NPQ in Lat A treatments with time implied that the MPB assemblages can recover their physiological photoprotection capacity to adapt to light stress. Non-migratory MPB exhibited lower light use efficiency (lower

) and lower maximum photosynthetic capacity (lower rETR

max

) than migratory MPB under light intensities above 250 μmol/(m

·s) after 4.0 h illumination.

关键词

Keywords

references

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