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IlTorAlte

ABSTRACT: Tortricodes alternella (winter shade), genomic and transcriptomic data

PROVIDER: PRJEB57277 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	ERR10466813_1.fastq.gz	Fastqsanger.gz
	ERR10466813_2.fastq.gz	Fastqsanger.gz
	ERR10462079.fastq.gz	Fastqsanger.gz
	ERR12245531_1.fastq.gz	Fastqsanger.gz
	ERR12245531_2.fastq.gz	Fastqsanger.gz

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Specific thylakoid protein phosphorylations are prerequisites for overwintering of Norway spruce (Picea abies) photosynthesis

Project description:Coping of evergreen conifers of boreal forests with freezing temperatures on bright winter days puts the photosynthetic machinery in great risk of oxidative damage. To survive harsh winter conditions, conifers have evolved a unique but poorly characterised photoprotection mechanism, a sustained form of non-photochemical quenching (sustained NPQ). Here we focused on functional properties and underlying molecular mechanisms related to the development of sustained NPQ in Norway spruce (Picea abies). Data was collected during four consecutive years (2016-19) from trees growing in sun and shade habitats. When day temperatures dropped below -4°C, specific N-terminally triply phosphorylated LHCB1 isoform (3p-LHCII) and phosphorylated PSBS (p-PSBS) were detected in the thylakoid membrane. Development of sustained NPQ coincided with the highest level of 3p-LHCII and p-PSBS, occurring after prolonged combination of bright winter days and temperature close to -10°C. Artificial induction of both the sustained NPQ and recovery from naturally induced sustained NPQ provided information on differential dynamics and light-dependence of 3p-LHCII and p-PSBS accumulation and dephosphorylation as essential prerequisites of sustained NPQ. Data obtained collectively suggest three novel components related to sustained NPQ in spruce. (i) Freezing temperatures induce 3p-LHCII accumulation independently of light, which is suggested to initiate de-stacking of appressed thylakoid membranes due to increased electrostatic repulsion of adjacent membranes. (ii) p-PSBS accumulation is both light- and temperature-dependent and closely linked to the initiation of sustained NPQ, which (iii) in concert with PSII photoinhibition is likely to trigger sustained NPQ in spruce.

2020-07-27 | PXD018941 | Pride

PHYTOCHROME-INTERACTING FACTOR 7 and RELATIVE OF EARLY FLOWERING 6 act in shade avoidance memory in Arabidopsis

Project description:Shade avoidance helps plants maximize their access to light for growth under crowding. It is unknown, however, whether a priming shade avoidance mechanism exists that allows plants to respond more effectively to successive shade conditions. Here, we show that the shade-intolerant plant Arabidopsis can remember a first experienced shade event and respond more efficiently to the next event on hypocotyl elongation. The transcriptional regulator PHYTOCHROME-INTERACTING FACTOR 7 (PIF7) and the histone H3K27-demethylase RELATIVE OF EARLY FLOWERING 6 (REF6) were identified as being required for this shade avoidance memory. RNA-sequencing analysis revealed that shade induction of shade memory-related genes was impaired in the pif7 and ref6 mutants. Based on the enrichments of H3K27me3, REF6 and PIF7, we found that priming shade treatment induced PIF7 accumulation, which further recruited REF6 to demethylate H3K27me3 on the chromatin of certain memory-related genes, leading to a state poised for their transcription. Upon the second shade treatment, enhanced shade-mediated induction of these genes resulted in stronger hypocotyl growth responses. We conclude that the transcriptional memory mediated by epigenetic modification plays a key role in the ability of primed plants to remember previously experienced shade and acquire enhanced responses to recurring shade conditions.

2024-07-29 | GSE268785 | GEO

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