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Singlet oxygen-triggered chloroplast-to-nucleus retrograde signalling pathways: an emerging perspective

Authors
Dogra, Vivek
Kim, Chanhong
Published in Plant, Cell and Environment. 2018, vol. 41, no. 8, p. 1727-1738
Abstract Singlet oxygen (¹O₂) is a prime cause of photo-damage of the photosynthetic apparatus. The chlorophyll molecules in the photosystem II reaction center and in the light-harvesting antenna complex are major sources of ¹O₂ generation. It has been thought that the generation of ¹O₂ mainly takes place in the appressed regions of the thylakoid membranes, namely, the grana core, where most of the active photosystem II complexes are localized. Apart from being a toxic molecule, new evidence suggests that ¹O₂ significantly contributes to chloroplast-to-nucleus retrograde signalling that primes acclimation and cell death responses. Interestingly, recent studies reveal that chloroplasts operate two distinct ¹O₂-triggered retrograde signalling pathways in which β-carotene and a nuclear-encoded chloroplast protein EXECUTER1 play essential roles as signalling mediators. The coexistence of these mediators raises several questions: their crosstalk, source(s) of ¹O₂, downstream signalling components, and the perception and reaction mechanism of these mediators towards ¹O₂. In this review, we mainly discuss the molecular genetic basis of the mode of action of these two putative ¹O₂ sensors and their corresponding retrograde signalling pathways. In addition, we also propose the possible existence of an alternative source of ¹O₂, which is spatially and functionally separated from the grana core.
Keywords AcclimationEXECUTER1PhotoinhibitionProgrammed cell deathRetrograde signallingSingletOxygenβ-carotene
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PMID: 29749057
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DOGRA, Vivek, ROCHAIX, Jean-David, KIM, Chanhong. Singlet oxygen-triggered chloroplast-to-nucleus retrograde signalling pathways: an emerging perspective. In: Plant, Cell and Environment, 2018, vol. 41, n° 8, p. 1727-1738. https://archive-ouverte.unige.ch/unige:111386

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Deposited on : 2018-11-23

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