A Sentinel Role for Plastids

Bouvier, Florence; Mialoundama, Alexis Samba; Camara, Bilal

doi:10.1007/7089_2008_42

Cited by 8 publications

(10 citation statements)

References 167 publications

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“…Regulation of the VAZ pool size was shown to be under control of plastid signals ( Kawabata and Takeda, 2014 ). Among the signals originating from high-light-exposed chloroplasts are redox changes and ROS, and metabolites or hormones synthesized in plastids ( Bouvier et al , 2008 ; Dietz, 2015 ). In comparison with wild-type plants, RNAi-W1 plants have an increased size of the VAZ pool and a reduced epoxidation state of these pigments ( Fig.…”

Section: Discussionmentioning

confidence: 99%

Acceleration of leaf senescence is slowed down in transgenic barley plants deficient in the DNA/RNA-binding protein WHIRLY1

Kucharewicz

Distelfeld

Bilger

et al. 2017

Journal of Experimental Botany

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Section: Discussionmentioning

confidence: 99%

Acceleration of leaf senescence is slowed down in transgenic barley plants deficient in the DNA/RNA-binding protein WHIRLY1

Kucharewicz

Distelfeld

Bilger

et al. 2017

Journal of Experimental Botany

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“…Photosynthetic activity is highly susceptible to environmental cues such as irradiance, temperature and water supply, and this feature makes chloroplasts excellent sensors of environmental information. Moreover, chloroplasts permanently transmit information about the functional state of the photosynthetic apparatus to the nucleus by various signaling molecules/factors, such as ROS, carotenoid‐derived oxidation products with signaling function (Ramel et al , Shumbe et al ) and hormones synthesized in chloroplasts (Bouvier et al ). Responses in the nucleus ensure that plants acclimate to the changing environmental situation and avoid oxidative stress (operational control; Pogson et al ).…”

Section: Retrograde Signaling In the Control Of Senescencementioning

confidence: 99%

The impact of photosynthesis on initiation of leaf senescence

Krieger‐Liszkay

Krupinska

Shimakawa

2019

Physiologia Plantarum

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Senescence is the last stage of leaf development preceding the death of the organ, and it is important for nutrient remobilization and for feeding sink tissues. There are many reports on leaf senescence, but the mechanisms initiating leaf senescence are still poorly understood. Leaf senescence is affected by many environmental factors and seems to vary in different species and even varieties of plants, which makes it difficult to generalize the mechanism. Here, we give an overview on studies reporting about alterations in the composition of the photosynthetic electron transport chain in chloroplasts during senescence. We hypothesize that alternative electron flow and related generation of the proton motive force required for ATP synthesis become increasingly important during progression of senescence. We address the generation of reactive oxygen species (ROS) in chloroplasts in the initiation of senescence, retrograde signaling from the chloroplast to the nucleus and ROS‐dependent signaling associated with leaf senescence. Finally, a few ideas for increasing crop yields by increasing the chloroplast lifespan are presented.

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“…These signals could potentially modulate the expression of nuclear genes via metabolic retrograde signaling pathways 2 . The metabolites produced in the chloroplast that function as signaling molecules including reactive oxygen species (ROS) 3 4 , sugars 5 6 , 12-oxo phytodienoic acid (OPDA) of the jasmonic acid (JA) biosynthesis pathway 7 8 , tetrapyrrole intermediates of chlorophyll biosynthesis pathway 9 and methylerythritol cyclodiphosphate of the methylerythritol phosphate (MEP) pathway 10 as well as phytohormones derived from chloroplast-produced precursors, such as gibberellin (GA), abscisic acid (ABA), salicylic acid (SA) and JA 11 12 .…”

mentioning

confidence: 99%

Accumulation of high OPDA level correlates with reduced ROS and elevated GSH benefiting white cell survival in variegated leaves

Sun

Hung

Qiu

et al. 2017

Sci Rep

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Variegated ‘Marble Queen’ (Epipremnum aureum) plant has white (VMW) and green (VMG) sectors within the same leaf. The white sector cells containing undifferentiated chloroplasts are viable, but the underlying mechanism for their survival and whether these white cells would use any metabolites as signal molecules to communicate with the nucleus for maintaining their viability remain unclear. We analyzed and compared phytohormone levels with their precursors produced in chloroplasts between VMW and VMG, and further compared their transcriptomes to understand the consequences related to the observed elevated 12-oxo phytodienoic acid (OPDA), which was 9-fold higher in VMW than VMG. Transcriptomic study showed that a large group of OPDA-responsive genes (ORGs) were differentially expressed in VMW, including stress-related transcription factors and genes for reactive oxygen species (ROS) scavengers, DNA replication and repair, and protein chaperones. Induced expression of these ORGs could be verified in OPDA-treated green plants. Reduced level of ROS and higher levels of glutathione in VMW were further confirmed. Our results suggest that elevated OPDA or its related compounds are recruited by white cells as a signaling molecule(s) to up-regulate stress and scavenging activity related genes that leads to reduced ROS levels and provides survival advantages to the white cells.

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A Sentinel Role for Plastids

Cited by 8 publications

References 167 publications

Acceleration of leaf senescence is slowed down in transgenic barley plants deficient in the DNA/RNA-binding protein WHIRLY1

Acceleration of leaf senescence is slowed down in transgenic barley plants deficient in the DNA/RNA-binding protein WHIRLY1

The impact of photosynthesis on initiation of leaf senescence

Accumulation of high OPDA level correlates with reduced ROS and elevated GSH benefiting white cell survival in variegated leaves

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