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The acclimation of photosynthesis and respiration to temperature in the C 3 – C 4 intermediate S alsola divaricata : induction of high respiratory CO 2 release under low temperature
Author(s) -
GANDIN ANTHONY,
KOTEYEVA NURIA K.,
VOZNESENSKAYA ELENA V.,
EDWARDS GERALD E.,
COUSINS ASAPH B.
Publication year - 2014
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.12345
Subject(s) - photorespiration , photosynthesis , respiration , acclimatization , oxygen , botany , biophysics , chloroplast , chemistry , biology , biochemistry , organic chemistry , gene
Photosynthesis in C 3 – C 4 intermediates reduces carbon loss by photorespiration through refixing photorespired CO 2 within bundle sheath cells. This is beneficial under warm temperatures where rates of photorespiration are high; however, it is unknown how photosynthesis in C 3 – C 4 plants acclimates to growth under cold conditions. Therefore, the cold tolerance of the C 3 – C 4 S alsola divaricata was tested to determine whether it reverts to C 3 photosynthesis when grown under low temperatures. Plants were grown under cold (15/10 °C), moderate (25/18 °C) or hot (35/25 °C) day/night temperatures and analysed to determine how photosynthesis, respiration and C 3 – C 4 features acclimate to these growth conditions. The CO 2 compensation point and net rates of CO 2 assimilation in cold‐grown plants changed dramatically when measured in response to temperature. However, this was not due to the loss of C 3 – C 4 intermediacy, but rather to a large increase in mitochondrial respiration supported primarily by the non‐phosphorylating alternative oxidative pathway ( AOP ) and, to a lesser degree, the cytochrome oxidative pathway ( COP ). The increase in respiration and AOP capacity in cold‐grown plants likely protects against reactive oxygen species ( ROS ) in mitochondria and photodamage in chloroplasts by consuming excess reductant via the alternative mitochondrial respiratory electron transport chain.