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Plant circadian clocks increase photosynthesis, growth, ..

In wild type and in long- and short-circadian period mutants of Arabidopsis thaliana, plants with a clock period matched to the environment contain more chlorophyll, fix more carbon, grow faster, and survive better than plants with circadian periods differing from their environment.

We show that a substantial photosynthetic advantage is conferred by correct matching of the circadian clock period with that of the external light-dark cycle.

Plant circadian clocks increase photosynthesis, growth, survival and competitive advantage.

Plant circadian clocks increase photosynthesis ..

Plant Circadian Clocks Increase Photosynthesis, Growth, Survival, and Competitive Advantage

Plants develop mechanisms of adaptations at multiple levels to track and cope with fluctuations in the light environment. At molecular level, the correct matching of circadian variation of gene expression with environmental rhythms allows plants to optimize the utilization of environmental light and to prevent damages due to light excess. Several studies highlighted that a correct matching of endogenous rhythms and external rhythms increases organismal fitness over a board geographic range. Indeed, latitudinal clines in circadian clock gene expression levels (and polymorphism in clock genes) were found in plants, suggesting that natural variation in clock parameters are required to synchronize organisms with their specific environment. Understanding the genetic and physiological mechanisms that plants develop for the seasonal and daily response to environmental conditions, could allow to predict their response to unexpected changes in environmental conditions that could happen in the future due to anthropogenic and climatic changes. Here we explore variations existing, in the daily phase, along a bathymetrical cline in the marine angiosperm Posidonia oceanica (L.) Delile, a key species in costal Mediterranean ecosystems. To do that, we measured modulation of genes expression, by RT-qPCR, at six time points during the day, in several genes related to photosynthesis and circadian rhythms regulation in plants growing at three target depths during the daily cycle along a bathymetrical cline (5 to 30 meter depth). Sampling was performed in a continuous meadow located in the Bay of Calvi, Corsica (thanks to the ESF Cost Action 0906). We analyze the effects of the distinct environmental light conditions on the circadian fluctuation of gene expression. Further, we assess the phenotypic variation among and between genotypes and we discuss its potential adaptive relevance on P. oceanica fitness and survival.

We show that a substantialphotosynthetic advantage is conferred by correct matching of thecircadian clock period with that of the external light-dark cycle.

Webb, AAR (2005) Plant circadian clocks increase photosynthesis, ..

Summary:
Plants develop mechanisms of adaptations at multiple levels to track and cope with fluctuations in the light environment. At molecular level, the correct matching of circadian variation of gene expression with environmental rhythms allows plants to optimize the utilization of environmental light and to prevent damages due to light excess. Several studies highlighted that a correct matching of endogenous rhythms and external rhythms increases organismal fitness over a board geographic range. Indeed, latitudinal clines in circadian clock gene expression levels (and polymorphism in clock genes) were found in plants, suggesting that natural variation in clock parameters are required to synchronize organisms with their specific environment. Understanding the genetic and physiological mechanisms that plants develop for the seasonal and daily response to environmental conditions, could allow to predict their response to unexpected changes in environmental conditions that could happen in the future due to anthropogenic and climatic changes. Here we explore variations existing, in the daily phase, along a bathymetrical cline in the marine angiosperm Posidonia oceanica (L.) Delile, a key species in costal Mediterranean ecosystems. To do that, we measured modulation of genes expression, by RT-qPCR, at six time points during the day, in several genes related to photosynthesis and circadian rhythms regulation in plants growing at three target depths during the daily cycle along a bathymetrical cline (5 to 30 meter depth). Sampling was performed in a continuous meadow located in the Bay of Calvi, Corsica (thanks to the ESF Cost Action 0906). We analyze the effects of the distinct environmental light conditions on the circadian fluctuation of gene expression. Further, we assess the phenotypic variation among and between genotypes and we discuss its potential adaptive relevance on P. oceanica fitness and survival.

Plant circadian clocks increase photosynthesis, growth, survival, and competitive advantage

AB - Circadian clocks are believed to confer an advantage to plants, but the nature of that advantage has been unknown. We show that a substantial photosynthetic advantage is conferred by correct matching of the circadian clock period with that of the external light-dark cycle. In wild type and in long- and short-circadian period mutants of Arabidopsis thaliana, plants with a clock period matched to the environment contain more chlorophyll, fix more carbon, grow faster, and survive better than plants with circadian periods differing from their environment. This explains why plants gain advantage from circadian control.

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Plant circadian clocks increase photosynthesis, ..


Plant circadian clocks increase photosynthesis, growth, survival,

AB - Circadian clocks are believed to confer an advantage to plants, but the nature of that advantage has been unknown. We show that a substantial photosynthetic advantage is conferred by correct matching of the circadian clock period with that of the external light-dark cycle. In wild type and in long- and short-circadian period mutants of Arabidopsis thaliana, plants with a clock period matched to the environment contain more chlorophyll, fix more carbon, grow faster, and survive better than plants with circadian periods differing from their environment. This explains why plants gain advantage from circadian control.

clocks increase photosynthesis, growth, ..

N2 - Circadian clocks are believed to confer an advantage to plants, but the nature of that advantage has been unknown. We show that a substantial photosynthetic advantage is conferred by correct matching of the circadian clock period with that of the external light-dark cycle. In wild type and in long- and short-circadian period mutants of Arabidopsis thaliana, plants with a clock period matched to the environment contain more chlorophyll, fix more carbon, grow faster, and survive better than plants with circadian periods differing from their environment. This explains why plants gain advantage from circadian control.

of how the circadian clock affects plant growth and ..

Since our data suggest that the effects of photosynthesis on the circadian clock are mediated by sugars, we investigated the role for sugars in circadian function in more detail. We first tested whether the effects of exogenous sucrose represent a general response to sugar. Circadian period of CCA1:LUC, PRR7:LUC and TIMING OF CAB1 (TOC1):LUC were on average 4.2 h shorter in seedlings grown in media containing 90 mM sucrose (3% w/v), glucose or fructose compared to mannitol-treated controls in continuous low light (). Similarly, exogenous sucrose, glucose or fructose, but not mannitol or a non-metabolisable glucose analog 3-O-methyl glucose, were able to sustain circadian rhythms in continuous dark (). These data suggest that the effects of exogenous sucrose on circadian rhythms represent a general response to metabolically active sugars.

2005) Plant circadian clocks increase photosynthesis, ..

N2 - Circadian clocks are believed to confer an advantage to plants, but the nature of that advantage has been unknown. We show that a substantial photosynthetic advantage is conferred by correct matching of the circadian clock period with that of the external light-dark cycle. In wild type and in long- and short-circadian period mutants of Arabidopsis thaliana, plants with a clock period matched to the environment contain more chlorophyll, fix more carbon, grow faster, and survive better than plants with circadian periods differing from their environment. This explains why plants gain advantage from circadian control.

Plant circadian clocks increase photosynthesis

In light-dark cycles there are robust endogenous rhythms of soluble sugars, which peak ~4-8 h after dawn, (). Inhibition of photosynthesis by either CO2-depletion or DCMU treatment reduced endogenous sugar concentrations (). To test whether the effects of inhibition of photosynthesis on the circadian oscillator were due to reduced sugar production, we re-supplied exogenous sucrose to CO2-depleted or DCMU-treated seedlings. Period lengthening by either treatment was suppressed by addition of exogenous sucrose (). The effects of DCMU treatment on CCA1:LUC rhythms were reversed by addition of as little as 5 mM (0.15 % w/v) exogenous sucrose to the growth media (, ). We also tested the effect of norflurazon or lincomycin, which both trigger retrograde signalling from the chloroplast to the nucleus. Neither treatment lengthened circadian period of PRR7:LUC () or inhibited CCA1:LUC activity () in the presence or absence of exogenous sucrose. Furthermore, we did not find evidence that photosynthesis might affect clock function through mechanisms associated with reactive oxygen species (ROS) production (), consistent with a recent report.

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