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 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Plant, Cell and Environment Année : 2014

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

Résumé

Photosynthesis in C-3-C-4 intermediates reduces carbon loss by photorespiration through refixing photorespired CO2 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 Salsola divaricata was tested to determine whether it reverts to C-3 photosynthesis when grown under low temperatures. Plants were grown under cold (15/10 degrees C), moderate (25/18 degrees C) or hot (35/25 degrees C) day/night temperatures and analysed to determine how photosynthesis, respiration and C-3-C-4 features acclimate to these growth conditions. The CO2 compensation point and net rates of CO2 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.

Dates et versions

hal-02992716 , version 1 (06-11-2020)

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Anthony Gandin, Nuria Koteyeva, Elena Voznesenskaya, Gerald Edwards, Asaph Cousins. 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. Plant, Cell and Environment, 2014, 37 (11), pp.2601-2612. ⟨10.1111/pce.12345⟩. ⟨hal-02992716⟩
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