In search of a biological hour

Koukkari, Willard L.; Bingham, C. Raymond; Hobbs, Johnna D.; Duke, Stanley H.

doi:10.1016/s0176-1617(97)80264-7

Cited by 9 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, the RLMs appeared in a random or ultradian pattern—with a 1.5–2.5 h interval (Table S1); therefore, it can be assumed that the phenomena may be tuned by an internal clock similar to nyctinastic movements (Moran 2007) and circumnutations (Darwin & Darwin 1880; Johnsson 1997; Stolarz & Dziubińska 2017b). Physiological processes such as leaf and shoot movement, stem growth, and respiration have an ultradian pattern as well (Engelmann & Johnsson 1998; Johnsson 2007; Koukkari et al 1997). The present new results showed the usefulness of continuous long‐term time‐lapse photography observation in investigations of plant movements.…”

Section: Discussionmentioning

confidence: 99%

Spontaneous rapid leaf movements and action potentials in Mimosa pudica L.

Stolarz

Trębacz

2021

Physiologia Plantarum

View full text Add to dashboard Cite

Movements and action potentials of Mimosa pudica L. plants, commonly known for their sensitivity to touch, were measured using time‐lapse photography and extracellular electrical potential recording methods in 4‐day experiments. In intact plants, spontaneous rapid leaf movements (RLMs) were revealed. The rapid downward movement of the leaf lasted approx. 1 s and the return to the previous position took approx. 17 min. Additionally, spontaneous action potentials (SAPs) with amplitudes of 3–100 mV and half‐time of approx. 15 s were observed for the first time in M. pudica. Spontaneous APs propagated basipetally or acropetally with a velocity of 3–75 cm min−1. 36% of SAPs passing along the shoots were accompanied by RLMs. There was a delay between the appearance of SAP and RLM, indicating that SAPs may trigger the RLMs.

show abstract

Section: Discussionmentioning

confidence: 99%

Spontaneous rapid leaf movements and action potentials in Mimosa pudica L.

Stolarz

Trębacz

2021

Physiologia Plantarum

View full text Add to dashboard Cite

show abstract

“…The redox poise is considered as an overarching aspect. Koukkari et al (1997) have searched among ultradian rhythms for a "biological hour". Among ultradian oscillations in bacteria, amoebae, yeast, higher plants and mammals they found periods ranging from 30 to 240 min averaging 95 min.…”

Section: Ultradian Rhythmsmentioning

confidence: 99%

Rhythms in Plants

Mancuso¹,

Shabala²

2015

View full text Add to dashboard Cite

“…More recently, circumnutations have been investigated using a photo-diode containing apparatus [ 7 ] and currently by time-lapse images [ 8 - 10 ]. Some investigations search the core mechanism [ 11 - 13 ] and ultradian pacemaker of circumnutation [ 14 ]. The circumnutation analysis also accompanies investigations of gravitropic responses [ 10 , 15 , 16 ], growth mechanisms [ 17 - 20 ], ethylene signalling [ 21 ], IP 3 signalling [ 22 ], and glutamate signalling pathways [ 23 ] as well as investigations of aluminium treatment [ 9 ] and circadian clock [ 24 - 26 ].…”

Section: Introductionmentioning

confidence: 99%

Circumnutation Tracker: novel software for investigation of circumnutation

et al. 2014

View full text Add to dashboard Cite

BackgroundAn endogenous, helical plant organ movement named circumnutation is ubiquitous in the plant kingdom. Plant shoots, stems, tendrils, leaves, and roots commonly circumnutate but their appearance is still poorly described. To support such investigations, novel software Circumnutation Tracker (CT) for spatial-temporal analysis of circumnutation has been developed.ResultsCT works on time-lapse video and collected circumnutation parameters: period, length, rate, shape, angle, and clockwise- and counterclockwise directions. The CT combines a filtering algorithm with a graph-based method to describe the parameters of circumnutation. The parameters of circumnutation of Helianthus annuus hypocotyls and the relationship between cotyledon arrangement and circumnutation geometry are presented here to demonstrate the CT options.ConclusionsWe have established that CT facilitates and accelerates analysis of circumnutation. In combination with the physiological, molecular, and genetic methods, this software may be a powerful tool also for investigations of gravitropism, biological clock, and membrane transport, i.e. processes involved in the mechanism of circumnutation.

show abstract

In search of a biological hour

Cited by 9 publications

References 22 publications

Spontaneous rapid leaf movements and action potentials in Mimosa pudica L.

Spontaneous rapid leaf movements and action potentials in Mimosa pudica L.

Rhythms in Plants

Circumnutation Tracker: novel software for investigation of circumnutation

Contact Info

Product

Resources

About