Variations in Circadian Clock Organization &amp; Function: A Journey from Ancient to Recent

Patnaik, Alena; Alavilli, Hemasundar; Rath, Jnanendra; Panigrahi, Kishore C. S.; Panigrahy, Madhusmita

doi:10.1007/s00425-022-04002-1

Cited by 8 publications

(7 citation statements)

References 208 publications

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“…In such cases, a temperature compensation mechanism may evolve to ensure that the rate does not change as the temperature changes. A well-known example is the temperature compensation of the circadian clock [15][16][17]. The phenomenon newly discovered with A. platensis is also a kind of temperature compensation in which the migration speed is kept almost constant in a wide temperature range.…”

Section: Discussionmentioning

confidence: 99%

Helicoid Morphology of Arthrospira platensis NIES-39 Confers Temperature Compensation in the Longitudinal Movement Velocity of Its Trichomes

Shiraishi,

Sasase,

Nakashima

2024

Phycology

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The velocity of the gliding movement of filamentous cyanobacteria on a solid surface usually has a strong temperature dependency, and the higher the temperature, the faster the speed. Former studies on this phenomenon were conducted using filamentous cyanobacteria with straight morphology. We examined the velocity of the gliding movement of Arthrospira platensis NIES-39 along its longitudinal axis to see if the same was true for this cyanobacterium with helicoid trichomes. Experimental results showed little temperature dependency in the velocity in a wide temperature range in this cyanobacterium. However, when we examined the velocity using mutants with straight trichomes, their velocity was strongly affected by temperature, like other formerly analyzed filamentous cyanobacteria. This result indicates that the helicoid morphology of A. platensis trichomes confers temperature compensation to their migration velocity, enabling them to keep a relatively constant velocity under various temperatures. Migration of wild-type trichomes is considerably suppressed compared to the straight-trichome mutants on solid media. The temperature compensation in the locomotion of this organism appears to be established as part of such a suppression. It was also found that the velocity of this cyanobacterium depended on the trichome length when they were atypically short (<250 µm); the shorter the trichomes, the slower the gliding movement tended to be. This result indicates that the coordinated action of a high number of cells constituting the trichome is required for efficient gliding movement.

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Section: Discussionmentioning

confidence: 99%

Helicoid Morphology of Arthrospira platensis NIES-39 Confers Temperature Compensation in the Longitudinal Movement Velocity of Its Trichomes

Shiraishi,

Sasase,

Nakashima

2024

Phycology

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“…The pure culture of F. oxysporum was taken by aseptically punching out 5 mm of F. oxysporum fungal colony from stock. It was allowed to grow for 15 days in a 250-ml conical flask containing 100 ml of potato dextrose broth (PDB) along with the inoculum, in a shaker maintained at 25°C and 60 rpm ( Patnaik et al., 2022 ). After the incubation period, the culture and the fungal mycelia were separated using a sterile nylon cloth, and the density of the conidial suspension was counted using a hemocytometer until it reached a concentration of ~ 6.5 ×10 6 spores/ml.…”

Section: Methodsmentioning

confidence: 99%

“…GI structural homology reveals that it lacks any conserved protein domains ( David et al, 2006 ; Mishra and Panigrahi, 2015 ). GI is diurnally regulated, and its transcript and protein levels are strictly controlled by the circadian clock ( Patnaik et al., 2022 ). Any change in the components of the circadian clock has been demonstrated to alter the transcription of GI.…”

Section: Introductionmentioning

confidence: 99%

GIGANTEA supresses wilt disease resistance by down-regulating the jasmonate signaling in Arabidopsis thaliana

Patnaik

Kumar²,

Behera³

et al. 2023

Front. Plant Sci.

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GIGANTEA (GI) is a plant-specific nuclear protein that plays a pleiotropic role in the growth and development of plants. GI’s involvement in circadian clock function, flowering time regulation, and various types of abiotic stress tolerance has been well documented in recent years. Here, the role of GI in response to Fusarium oxysporum (F. oxysporum) infection is investigated at the molecular level comparing Col-0 WT with the gi-100 mutant in Arabidopsis thaliana. Disease progression, photosynthetic parameters, and comparative anatomy confirmed that the spread and damage caused by pathogen infection were less severe in gi-100 than in Col-0 WT plants. F. oxysporum infection induces a remarkable accumulation of GI protein. Our report showed that it is not involved in flowering time regulation during F. oxysporum infection. Estimation of defense hormone after infection showed that jasmonic acid (JA) level is higher and salicylic acid (SA) level is lower in gi-100 compared to Col-0 WT. Here, we show that the relative transcript expression of CORONATINE INSENSITIVE1 (COI1) and PLANT DEFENSIN1.2 (PDF1.2) as a marker of the JA pathway is significantly higher while ISOCHORISMATE SYNTHASE1 (ICS1) and NON-EXPRESSOR OF PATHOGENESIS-RELATED GENES1 (NPR1), the markers of the SA pathway, are downregulated in the gi-100 mutants compared to Col-0 plants. The present study convincingly suggests that the GI module promotes susceptibility to F. oxysporum infection by inducing the SA pathway and inhibiting JA signaling in A. thaliana.

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“…The dynamic responsiveness of GI across various developmental stages underscores its active involvement in physiological processes such as seed dormancy, germination, hypocotyl emergence, circadian clock regulation, flower initiation, carbohydrate metabolism, and stress responses [16][17][18][19][20][21]. The intricate temporal regulation of GI during diurnal cycles highlights its interconnection with the circadian clock [22], showcasing its pivotal role in coordinating plant temporal responses. GI's influence extends from breaking seed dormancy to circadian clock regulation and stress responses.…”

Section: Introductionmentioning

confidence: 99%

GIGANTEA Unveiled: Exploring Its Diverse Roles and Mechanisms

Liu,

Xie,

Yahaya

et al. 2024

Genes

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GIGANTEA (GI) is a conserved nuclear protein crucial for orchestrating the clock-associated feedback loop in the circadian system by integrating light input, modulating gating mechanisms, and regulating circadian clock resetting. It serves as a core component which transmits blue light signals for circadian rhythm resetting and overseeing floral initiation. Beyond circadian functions, GI influences various aspects of plant development (chlorophyll accumulation, hypocotyl elongation, stomatal opening, and anthocyanin metabolism). GI has also been implicated to play a pivotal role in response to stresses such as freezing, thermomorphogenic stresses, salinity, drought, and osmotic stresses. Positioned at the hub of complex genetic networks, GI interacts with hormonal signaling pathways like abscisic acid (ABA), gibberellin (GA), salicylic acid (SA), and brassinosteroids (BRs) at multiple regulatory levels. This intricate interplay enables GI to balance stress responses, promoting growth and flowering, and optimize plant productivity. This review delves into the multifaceted roles of GI, supported by genetic and molecular evidence, and recent insights into the dynamic interplay between flowering and stress responses, which enhance plants’ adaptability to environmental challenges.

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Variations in Circadian Clock Organization & Function: A Journey from Ancient to Recent

Cited by 8 publications

References 208 publications

Helicoid Morphology of Arthrospira platensis NIES-39 Confers Temperature Compensation in the Longitudinal Movement Velocity of Its Trichomes

Helicoid Morphology of Arthrospira platensis NIES-39 Confers Temperature Compensation in the Longitudinal Movement Velocity of Its Trichomes

GIGANTEA supresses wilt disease resistance by down-regulating the jasmonate signaling in Arabidopsis thaliana

GIGANTEA Unveiled: Exploring Its Diverse Roles and Mechanisms

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