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Phytochrome B regulates reactive oxygen signaling during stress in plants.

ABSTRACT: Phytochrome B regulates reactive oxygen signaling during stress in plants.

PROVIDER: PRJNA780007 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR16934629_1.fastq.gz	Fastqsanger.gz
	SRR16934629_2.fastq.gz	Fastqsanger.gz
	SRR16934630_1.fastq.gz	Fastqsanger.gz
	SRR16934630_2.fastq.gz	Fastqsanger.gz
	SRR16934631_1.fastq.gz	Fastqsanger.gz

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Phytochrome B regulates reactive oxygen signaling during stress in plants.

Project description:Plants are essential for life on Earth converting light into chemical energy in the form of sugars. To adjust for changes in light intensity and quality, and to become as efficient as possible in harnessing light, plants evolved multiple light receptors, signaling, and acclimation mechanisms. In addition to altering plant metabolism, development and growth, light cues sensed by some photoreceptors, such as phytochromes, are also impacting many plant responses to biotic and abiotic stresses. Central for plant responses to different stresses are reactive oxygen species (ROS) that function as key signaling molecules. Recent studies demonstrated that respiratory burst oxidase homolog (RBOH) proteins that reside at the plasma membrane and produce ROS at the apoplast play a key role in plant responses to different biotic and abiotic stresses. Here we reveal that phytochrome B (phyB) and RBOHs function as part of a key regulatory module that controls ROS production, transcript expression, and plant acclimation to excess light stress. We further show that phyB can regulate ROS production during stress even if it is restricted to the cytosol, and that phyB, RBOHD and RBOHF co-regulate thousands of transcripts in response to light stress. Surprisingly, we found that phyB is also required for ROS accumulation in response to heat, wounding, cold, and bacterial infection. Taken together, our findings reveal that phyB plays a canonical role in plant responses to biotic and abiotic stresses, regulating ROS production, and that phyB and RBOHs function in the same regulatory pathway.

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Project description:A specific protective mechanism against chloroplast photo-reactive oxygen species in phosphate-starved rice plants

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Project description:B. cenocepacia J2315 was exposed to heat stress and to stress form reactive oxygen species. <br>To expose the cultures to heat stress, cells were grown at 37ºC to an O.D. of 0.4 to 0.45 and then transferred into a different shaking incubator at 42.5ºC, incubated for 1 hour at 150 rpm and harvested.<br>To expose cultures to oxidative stress by reactive oxygen species, cells were grown at 37ºC to an OD of 0.5. Then t butyl hydroperoxide or hydrogen peroxide solution were added to the culture at 0.001% and 0.15% final concentration. The culture was further incubated for 15 min and then harvested. <br>The expression profiles were compared to cells grown in LB medium without exposure to stress.<br>

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A specific protective mechanism against chloroplast photo-reactive oxygen species in phosphate-starved rice plants [ChIP-seq]

Project description:Phosphorus (Pi) starvation prevents a good match between light energy absorption and photosynthetic carbon metabolism. Photosynthetic electron-transport chain switches to use molecular oxygen as an electron carrier, generating photo-reactive oxygen species (photo-ROS) in chloroplast. In rice (Oryza sativa), DEEP GREEN PANICLE1 (DGP1) is robustly up-regulated in response to Pi-deficiency stress. DGP1 decreases the DNA-binding activities of the photosynthetic activators GLK1/2 on the genes involved in chlorophyll biosynthesis, light harvesting and electron transport. This Pi-starvation-induced mechanism dampens electron transport rates (ETRI and ETRII) and alleviates the electron-excessive stress in mesophyll cells. Meanwhile, DGP1 hijacks glycolytic enzymes GAPC1/2/3, redirecting glucose metabolism toward pentose phosphate pathway with superfluous NADPH production. Phenotypically, light irradiation induces O2– accumulation in Pi-starved WT leaves, but was observably accelerated in dgp1 mutant and impaired in GAPCsRNAi line and glk1glk2 double mutant. Interestingly, overexpression of DGP1 in rice caused hyposensitivity to the ROS-inducers (catechin and methyl viologen) and dgp1 mutant shows a similar inhibitory growth with the WT plants. We conclude that DGP1 gene serves as a specific antagonizer against Pi-starvation-induced photo-ROS, which integrates light-absorbing and anti-oxidative systems by orchestrating transcriptional and metabolic regulations, respectively.

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A specific protective mechanism against chloroplast photo-reactive oxygen species in phosphate-starved rice plants [RNA-seq]

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Project description:A specific protective mechanism against chloroplast photo-reactive oxygen species in phosphate-starved rice plants [RNA-seq]

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A specific protective mechanism against chloroplast photo-reactive oxygen species in phosphate-starved rice plants [ChIP-seq]

Project description:A specific protective mechanism against chloroplast photo-reactive oxygen species in phosphate-starved rice plants [ChIP-seq]

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Project description:We were interested in investigating the transcriptome responses to exogenous applications of brassinosteroid hormone when Arabidopsis seedlings are pre-stressed with a reactive oxygen species, hydrogen peroxide. We were interested in seeing which subsets of BR-responsive gene transcripts were most affected and how BR-responsive gene transcripts responded to increasing concentrations of hydrogen peroxide both as a whole and individually. Liquid culture Arabidopsis seedlings are grown under standard conditions. Hydrogen peroxide is added at various concentrations to pre-stress the seedlings. Following this pretreatment, the seedlings are then treated with brassinosteroid (BR) hormone (epi-brassinolide, BL). Following this treatment, seedlings are harvested and total RNA is extracted for genome-wide transcriptome analysis.

2011-02-28 | E-GEOD-20756 | biostudies-arrayexpress

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