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Responses of dark respiration in the light to desiccation and temperature in the intertidal macroalga, Ulva lactuca (Chorophyta) during emersion
Zou, Dinghui; Gao, Kunshan; Xia, Jianrong; Xu, Zhiguang; Zhang, Xin; Liu, Shuxia; Zou, DH, Shantou Univ, Inst Marine Biol, Ctr Sci, Guangdong 515063, Peoples R China
2007-07-01
Source PublicationPHYCOLOGIA
ISSN0031-8884
Volume46Issue:4Pages:363-370
AbstractDark respiration (nonphotorespiratory mitochondrial CO2 release) in the light (R-L) of the intertidal macroalga Ulva lactuca (Chorophyta) during emersion was investigated with respect to its response to variations in temperature and desiccation. R-L was estimated by CO2 gas-exchange analysis using the Kok effect method, whereas dark respiration in darkness (R-D) was determined from CO2 release at zero light. Rates of R, were significantly and consistently lower than those of R-D in emersed U. lactuca across all the temperature and desiccation levels measured. This demonstrated that dark respiration was partially depressed in the light, with the percentage inhibition ranging from 32 to 62%. Desiccation exerted a negative effect on R-L and R-D at a high temperature, 33 degrees C, whereas it had much less effect on respiration at low and moderate temperatures, 23 and 28 degrees C. In general, R-L and R-D increased with increasing temperature in U. lactuca during all stages of emersion but responded less positively to temperature change with increasing desiccation. Additionally, the Q(10) value (i.e. the proportional increase of respiration for each 10 degrees C rise in temperature) for R-L calculated over the temperature range of 23 to 33 degrees C was significantly higher than that for R-D in U. lactuca during the initial stages of emersion. Respiratory carbon loss as a percentage of gross photosynthetic carbon gain increased with increasing temperature and/or desiccation but was significantly reduced when estimated using R-L rather than R-D. It is suggested that measurements of R-L and how it changes in a variable environment are as important as estimates of R-D and photosynthesis in determining simultaneous balance between photosynthetic carbon uptake and respiratory carbon loss and in modeling the net daily carbon gain for an intertidal macroalga.; Dark respiration (nonphotorespiratory mitochondrial CO2 release) in the light (R-L) of the intertidal macroalga Ulva lactuca (Chorophyta) during emersion was investigated with respect to its response to variations in temperature and desiccation. R-L was estimated by CO2 gas-exchange analysis using the Kok effect method, whereas dark respiration in darkness (R-D) was determined from CO2 release at zero light. Rates of R, were significantly and consistently lower than those of R-D in emersed U. lactuca across all the temperature and desiccation levels measured. This demonstrated that dark respiration was partially depressed in the light, with the percentage inhibition ranging from 32 to 62%. Desiccation exerted a negative effect on R-L and R-D at a high temperature, 33 degrees C, whereas it had much less effect on respiration at low and moderate temperatures, 23 and 28 degrees C. In general, R-L and R-D increased with increasing temperature in U. lactuca during all stages of emersion but responded less positively to temperature change with increasing desiccation. Additionally, the Q(10) value (i.e. the proportional increase of respiration for each 10 degrees C rise in temperature) for R-L calculated over the temperature range of 23 to 33 degrees C was significantly higher than that for R-D in U. lactuca during the initial stages of emersion. Respiratory carbon loss as a percentage of gross photosynthetic carbon gain increased with increasing temperature and/or desiccation but was significantly reduced when estimated using R-L rather than R-D. It is suggested that measurements of R-L and how it changes in a variable environment are as important as estimates of R-D and photosynthesis in determining simultaneous balance between photosynthetic carbon uptake and respiratory carbon loss and in modeling the net daily carbon gain for an intertidal macroalga.
SubtypeArticle
KeywordDark Respiration Desiccation Emersion Intertidal Macroalgae Kok Effect Temperature Ulva
DepartmentShantou Univ, Inst Marine Biol, Ctr Sci, Guangdong 515063, Peoples R China; Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
Subject AreaPlant Sciences ; Marine & Freshwater Biology
DOI10.2216/06.98.1
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI
Language英语
WOS Research AreaPlant Sciences ; Marine & Freshwater Biology
WOS SubjectPlant Sciences ; Marine & Freshwater Biology
WOS IDWOS:000247855900002
WOS KeywordPYRUVATE-DEHYDROGENASE COMPLEX ; LEAF RESPIRATION ; PLANT RESPIRATION ; COLPOMENIA-PEREGRINA ; ALTERNATIVE OXIDASE ; THERMAL-ACCLIMATION ; XANTHIUM-STRUMARIUM ; FUCUS-VESICULOSUS ; MARINE MACROALGAE ; CO2 CONCENTRATION
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Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/8500
Collection期刊论文
Corresponding AuthorZou, DH, Shantou Univ, Inst Marine Biol, Ctr Sci, Guangdong 515063, Peoples R China
Affiliation1.Shantou Univ, Inst Marine Biol, Ctr Sci, Guangdong 515063, Peoples R China
2.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
Recommended Citation
GB/T 7714
Zou, Dinghui,Gao, Kunshan,Xia, Jianrong,et al. Responses of dark respiration in the light to desiccation and temperature in the intertidal macroalga, Ulva lactuca (Chorophyta) during emersion[J]. PHYCOLOGIA,2007,46(4):363-370.
APA Zou, Dinghui.,Gao, Kunshan.,Xia, Jianrong.,Xu, Zhiguang.,Zhang, Xin.,...&Zou, DH, Shantou Univ, Inst Marine Biol, Ctr Sci, Guangdong 515063, Peoples R China.(2007).Responses of dark respiration in the light to desiccation and temperature in the intertidal macroalga, Ulva lactuca (Chorophyta) during emersion.PHYCOLOGIA,46(4),363-370.
MLA Zou, Dinghui,et al."Responses of dark respiration in the light to desiccation and temperature in the intertidal macroalga, Ulva lactuca (Chorophyta) during emersion".PHYCOLOGIA 46.4(2007):363-370.
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