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Our initial studies have concentrated on the response of Arabidopsis thaliana (thale cress) to a sudden increase in light intensity. This is a continual problem that plants face, and as a consequence they often absorb more light energy than they can use for photosynthesis. To get around this problem, plants dissipate excess light energy (known as excitation energy) using a variety of processes. Some of these processes (such as the water-water cycle and photorespiration) generate reactive oxygen species (ROS) which are removed by a network of lower molecular weight antioxidants (eg. glutathione and ascorbate) and enzymes (such as superoxide dismutases and ascorbate peroxidases). If the production of ROS exceeds the capacity of the antioxidant network to deal with them, then cells suffer oxidative damage, which is often manifested as bleaching, paling or bronzing of leaves. Therefore a key part of how plants acclimate to such conditions is to adjust the functioning of their antioxidant network to suit their situation. The signal for making these adjustments is the ROS themselves and separate signalling routes controlled by the thiol antioxidant glutathione. An important part of acclimation to a changed environment may include the setting of thresholds for when such defences are deployed.
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Dipan Roy,Poonam Mehra,Vaishnavi Mukkawar,Lisa Clark, Kevin Bellande,Joop EM Vermeer, Raquel Martin Arevallilo,Teva VERNOUX, Kawinnat Sue ob,Andrew R Jones,Ulrike Bechtold,Philip Mark Mullineaux,
biorxiv(2024)
HORTSCIENCEno. 2 (2023): 180-196
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