A mobile ELF4 delivers circadian temperature information from shoots to roots

Chen, Wei Wei; Takahashi, Nobuhiro; Hirata, Yoshito; Nusinow, Dmitri A.; Kay, Steve A.; Más, Paloma Díaz

doi:10.1101/612671

Cited by 23 publications

(47 citation statements)

References 81 publications

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“…In plants, plasmodesmata may be responsible for the mediation as gap junctions. Because circadian mediators that transmit the plasmodesmata, ions such as Ca 2+ , low molecular weight metabolites, and clock-related proteins such as ELF4 may have functions in local coupling [14,[27][28][29]. The amplitude of each oscillator is an element that modulates its angular velocity (and accordingly, its period length) in this model.…”

Section: Discussionmentioning

confidence: 99%

An endogenous basis for synchronization manners of the circadian rhythm in proliferatingLemna minorplants

Ueno

Oyama

2021

Preprint

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Endogenous circadian rhythms in plants play a role in adaptation to day-night cycles. The circadian clock is a cell-autonomous system that functions through the coordination of time information in the plant body. Synchronization of cellular clocks is based on coordination mechanisms; the synchronization manners in proliferating plants remain unclear. We performed spatiotemporal analysis of the circadian rhythm of fronds (leaf-like plant units) of proliferating Lemna minor plants carrying a circadian bioluminescence reporter, AtCCA1:LUC. Noninvasive observations of the bioluminescence of fast-growing two-dimensional plants allowed us to analyze the circadian rhythms at a cell-level resolution and obtain information regarding frond lineage. We focused on spontaneous circadian organization under constant light conditions for plants with light/dark treatment (LD-grown) or without it (LL-grown). Even fronds developing from an LL-grown parental frond showed coherent circadian rhythms among them. This allowed the maintenance of circadian rhythmicity in proliferating plants. Inside a frond, a centrifugal phase/period pattern was observed in LD-grown plants, whereas various phase patterns with traveling waves were formed in LL-grown plants. These patterns were model-simulated by local coupling of cellular circadian oscillators with different initial synchronous states in fronds. Taken together with similar patterning previously reported for detached leaves of Arabidopsis, it is strongly suggested that local coupling is the primary force for the development of these phase patterns in plants lacking long-distance communication. We propose a basic framework of spontaneous phase patterning with three stages of circadian organization: initial phasing, evolution of patterning, and desynchronization/randomizing of phase, in association with altering cell-cell coupling.

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Section: Discussionmentioning

confidence: 99%

An endogenous basis for synchronization manners of the circadian rhythm in proliferatingLemna minorplants

Ueno

Oyama

2021

Preprint

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“…Circadian studies are rapidly expanding our view on how the circadian system works in different parts of the plant, and how mobile signals are able to synchronize clocks in distal organs [ 109 , 110 , 111 , 112 , 113 ]. Over the past recent years, it has become increasingly clear that circadian information is shared through short- and long-distance communication.…”

Section: Future Perspectivesmentioning

confidence: 99%

“…For example, coupling is minimum among cotyledon cells [ 116 ], variable in leaves [ 117 , 118 , 119 ], high in roots [ 120 ] and between the vasculature and neighbor mesophyll cells [ 121 ], and very high within cells at the shoot apex [ 122 ]. Long-distance circadian synchronization on the other hand, seems to occur through shoot-to-root photosynthetic signaling [ 123 ], light piping down the root [ 124 ] and by the movement of ELF4 from shoots to regulate the period of the root clock in a temperature-dependent manner [ 113 ]. The studies highlight specific and autonomous circadian function, which urgently calls for studies on changes of the chromatin status not only with a temporal resolution (circadian or seasonal) but also with spatial definition in order to identify cell, tissue-, and organ-specific circadian chromatin landscapes.…”

Section: Future Perspectivesmentioning

confidence: 99%

Chromatin Dynamics and Transcriptional Control of Circadian Rhythms in Arabidopsis

Maric

Más

2020

Genes

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Circadian rhythms pervade nearly all aspects of plant growth, physiology, and development. Generation of the rhythms relies on an endogenous timing system or circadian clock that generates 24-hour oscillations in multiple rhythmic outputs. At its bases, the plant circadian function relies on dynamic interactive networks of clock components that regulate each other to generate rhythms at specific phases during the day and night. From the initial discovery more than 13 years ago of a parallelism between the oscillations in chromatin status and the transcriptional rhythms of an Arabidopsis clock gene, a number of studies have later expanded considerably our view on the circadian epigenome and transcriptome landscapes. Here, we describe the most recent identification of chromatin-related factors that are able to directly interact with Arabidopsis clock proteins to shape the transcriptional waveforms of circadian gene expression and clock outputs. We discuss how changes in chromatin marks associate with transcript initiation, elongation, and the rhythms of nascent RNAs, and speculate on future interesting research directions in the field.

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“…From this analysis, ME2 appeared to represent a subnetwork of regulators that couples the acquisition of seed vigour with the induction of post-transcriptional regulation both in the embryo and endosperm. Also with the genes correlating with dormancy and longevity, we detected several homologues of genes connecting light, circadian rhythm and control of owering, such as PHYTOCHROME AND FLOWERING TIME 1 (PFT1, Solyc05g009710.4.1), EMBRYO DEFECTIVE 1507 (Solyc06g065300.4.1, a dead helicase implicated in the splicing of FLOWERING LOCUS C (FLC) [55] and EARLY FLOWERING 4, ELF4 (Solyc06g076960.2.1) that synchronizes the circadian clock with light and temperature [56], an homologue of FRIGIDA (Solyc04g072200.3.1) and PRMT5 mentioned above.…”

Section: Regulatory Network Associated With the Acquisition Of Seed mentioning

confidence: 99%

Gene co-expression analysis of tomato seed maturation reveals tissue-specific regulatory networks and hubs associated with the acquisition of desiccation tolerance and seed vigour

Bizouerne

Buitink

Ly-Vu

et al. 2020

Preprint

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Background During maturation seeds acquire several physiological traits to enable them to survive drying and disseminate the species. Few studies have addressed the regulatory networks controlling acquisition of these traits at the tissue level particularly in endospermic seeds such as tomato, which matures in a fully hydrated environment and does not undergo maturation drying. Using temporal RNA-seq analyses of the different seed tissues during maturation, gene network and trait-based correlations were used to explore the transcriptome signatures associated with desiccation tolerance, longevity, germination under water stress and dormancy. Results During maturation, 15,173 differentially expressed genes were detected, forming a gene network representing 21 expression modules, with 3 being specific to seed coat and embryo and 5 to the endosperm. A gene-trait significance measure identified a common gene module between endosperm and embryo associated with desiccation tolerance and conserved with non-endospermic seeds. In addition to genes involved in protection such LEA and HSP and ABA response, the module included antioxidant and repair genes. Dormancy was released concomitantly with increase in longevity throughout fruit ripening until 14 days after the red fruit stage. This was paralleled by an increase in SlDOG1-2 and PROCERA transcripts. The progressive increase in seed vigour was captured by three gene modules, one in common between embryo and endosperm and two tissue-specific. The common module was enriched with genes associated with mRNA processing in chloroplast and mitochondria (including penta- and tetratricopeptide repeat-containing proteins) and post-transcriptional regulation, as well several flowering genes. The embryo-specific module contained homologues of ABI4 and CHOTTO1 as hub genes associated with seed vigour, whereas the endosperm-specific module revealed a diverse set of processes that were related to genome stability, defence against pathogens and ABA/GA response genes. Conclusion The spatio-temporal co-expression atlas of seed maturation will serve as a valuable resource for the in-depth understanding of the dynamics of gene expression associated with the acquisition of seed vigour at the tissue level.

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A mobile ELF4 delivers circadian temperature information from shoots to roots

Cited by 23 publications

References 81 publications

An endogenous basis for synchronization manners of the circadian rhythm in proliferatingLemna minorplants

An endogenous basis for synchronization manners of the circadian rhythm in proliferatingLemna minorplants

Chromatin Dynamics and Transcriptional Control of Circadian Rhythms in Arabidopsis

Gene co-expression analysis of tomato seed maturation reveals tissue-specific regulatory networks and hubs associated with the acquisition of desiccation tolerance and seed vigour

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