Photosynthetic refixing of CO2 is responsible for the apparent disparity between mitochondrial respiration in the light and in the dark

• Autorzy: Kang H. , Li H. , Tao Y. , Ouyang Z.
• Języki publikacji: EN

Abstrakty

EN

The net photosynthetic rate (PN), the sample room CO₂ concentration (CO₂S) and the intercellular CO₂ concentration (Ci) in response to PAR, of C3 (wheat and bean) and C4 (maize and three-colored amaranth) plants were measured. Results showed that photorespiration (Rp) of wheat and bean could not occur at 2 % O₂. At 2 % O₂ and 0 µmol mol-1 CO₂, PN can be used to estimate the rate of mitochondrial respiration in the light (Rd). The Rd decreased with increasing PAR, and ranged between 3.20 and 2.09 µmol CO₂ m⁻² s⁻¹ in wheat. The trend was similar for bean (between 2.95 and 1.70 µmol CO₂ m⁻² s⁻¹), maize (between 2.27 and 0.62 µmol CO₂ m⁻² s⁻¹) and three-colored amaranth (between 1.37 and 0.49 µmol CO₂ m⁻² s⁻¹). The widely observed phenomenon of Rd being lower than Rn can be attributed to refixation, rather than light inhibition. For all plants tested, CO₂ recovery rates increased with increasing light intensity from 32 to 55 % (wheat), 29 to 59 % (bean), 54 to 87 % (maize) and 72 to 90 % (three-colored amaranth) at 50 and 2,000 µmol m⁻² s⁻¹, respectively.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2014
• Tom: 36
• Numer: 12
• Opis fizyczny: p.3157-3162,fig.,ref.

Twórcy

autor

Kang H.

• Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, People’s Republic of China
• Yucheng Comprehensive Experiment Station China Academy of Science, Beijing, 100101, People’s Republic of China
• Graduates University of Chinese Academy of Sciences, Beijing, 100101, People’s Republic of China
• Wenzhou Vocational and Technical College, Wenzhou, 325026, People’s Republic of China

autor

Li H.

• Wenzhou Vocational and Technical College, Wenzhou, 325026, People’s Republic of China

autor

Tao Y.

• College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, People’s Republic of China

autor

Ouyang Z.

• Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, People’s Republic of China
• Yucheng Comprehensive Experiment Station China Academy of Science, Beijing, 100101, People’s Republic of China
• Graduates University of Chinese Academy of Sciences, Beijing, 100101, People’s Republic of China

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Identyfikatory

DOI

10.1007/s11738-014-1679-5