Chinese Journal of Plant Ecology >

2014 , Vol. 38 >Issue 10: 1110 - 1116

DOI: https://doi.org/10.3724/SP.J.1258.2014.00105

Research Articles

Causes of decreasing mitochondrial respiration under light in four crops

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  • 1Wenzhou Vocational & Technical College, Wenzhou, Zhejiang 325006, China
    2Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
    3Yucheng Comprehensive Experiment Station, Chinese Academy of Sciences, Beijing 100101, China
    4University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2014-03-06

  Accepted date: 2014-06-04

  Online published: 2021-04-20

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Abstract

Aims Despite the increasing attention given to the rate of mitochondrial respiration under light (Rd), considerable confusion persists over whether mitochondrial respiration in the dark (Rn) is inhibited by light and whether Rd is affected by light intensity. The objective of this study is to test the hypotheses: 1)Rn is not inhibited by light; 2) the rate of Rd changes with light intensity; and 3) the photosynthetic refixation of CO2 produced by Rn accounts for the apparent disparity between Rd and Rn.
Methods In the present study, 0.02 mol·mol-1 O2 (i.e. 2% O2) was used to saturate Rn and to inhibit photorespiration (Rp). By using combined gas exchange measurements and a low O2 (2% O2) method, the post-illumination CO2 release rate of Rn, photosynthetic rate (Pn) in response to photosynthetically active radiation (PAR) in 2% O2 at either 380 or 0 μmol·mol-1 CO2, of C3 (Triticum aestivum and Glycine max) and C4(Zea mays and Amaranthus hypochondriacus) plants, were measured.
Important finding Rn was not inhibited by light. At 2% O2 and 0 μmol·mol-1 CO2, the measured parameters could be used to accurately estimate Rd when CO2 concentration was set for 0 μmol·mol-1. Rd decreased with increasing light intensity. Although Rd was lower in the dark, this could be accounted for by photosynthetic re-fixing of respiratory CO2. For all plants tested, CO2recovery rates increased with increasing light intensity (from 50 and 2 000 μmol·m-2·s-1).

Key words： CO2 re-fixed; inhibition; mitochondrial respiration in the light; photorespiration

Cite this article

KANG Hua-Jing, LI Hong, QUAN Wei, OUYANG Zhu . Causes of decreasing mitochondrial respiration under light in four crops[J]. Chinese Journal of Plant Ecology, 2014 , 38(10) : 1110 -1116 . DOI: 10.3724/SP.J.1258.2014.00105

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