Taxis in Euglena

Bowne, S. W.; Bowne, G.D.

doi:10.1016/0014-4827(67)90010-9

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…Mabx (1927) notes weak accumulation responses into dilute HC1 and weak responses to acetate. Aggregatory (accumulation) behavior has also been reported for acetic acid-acetate mixtures (Bowne and Bowne 1967) and weak acid conditions (Robbins 1952). The acetate response observed in the present study, as with several other aggregatory responses of Euglena (Wager 1911 ;Robbins 1952;Colombetti and Diehn 1978) is influenced by light and thus may not be due to acetate directly.…”

Section: Discussionsupporting

confidence: 83%

Anion sensitivity of motility and step-down photophobic responses of Euglena gracilis

Doughty

Diehn

1984

Arch. Microbiol.

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The motility and step-down photophobic re-sp6nses of Euglena are influenced by inorganic and organic anions. Persistent motility (with Ca 2 +, Mg 2+ and K + present) is supported with chloride or sulfate but not with acetate, nitrate or propionate as the only added anions. Cells in media containing acetate displayed a cell aggregation (clumping) behavior that was both red light sensitive and, under some conditions, was accompanied by suppression of the step-down photophobic response. Addition of sodium salts (C1-, SOl-, acetate or propionate) to cells in C1-or SO~-based media had differential effects on the duration of the step-down photophobic responses induced by blue light removal: anions alter the response. In addition, cells in all C1-containing media showed constant photophobic response duration following repeated stimulation. Cells in some SO4 2-containing media, however, showed response summation to repeated stimulation. This latter effect was reversible and was overcome by the addition of chloride anions.

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Section: Discussionsupporting

confidence: 83%

Anion sensitivity of motility and step-down photophobic responses of Euglena gracilis

Doughty

Diehn

1984

Arch. Microbiol.

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“…Diverse eukaryotes from distinct phyla use helical klinotaxis to track chemical gradients (such as diffusing from a food source) [52]. Helical klinotaxis has been described in various ciliates, the gametes of brown and green algae [53,54], the nonphotosynthetic green alga Polytomella magna [55], animal sperm [56], fungal zoospores [57], the heterotrophic flagellates Cafeteria [52] and Euglena [58], and the dinoflagellate Peridiniopsis berolinensis [59]. The gametes of many organisms are also guided by helical chemotaxis for external fertilization [60].…”

Section: Deterministic Steering By Temporal Comparisonmentioning

confidence: 99%

Origins of eukaryotic excitability

Wan

Jékely

2021

Phil. Trans. R. Soc. B

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All living cells interact dynamically with a constantly changing world. Eukaryotes, in particular, evolved radically new ways to sense and react to their environment. These advances enabled new and more complex forms of cellular behaviour in eukaryotes, including directional movement, active feeding, mating, and responses to predation. But what are the key events and innovations during eukaryogenesis that made all of this possible? Here we describe the ancestral repertoire of eukaryotic excitability and discuss five major cellular innovations that enabled its evolutionary origin. The innovations include a vastly expanded repertoire of ion channels, the emergence of cilia and pseudopodia, endomembranes as intracellular capacitors, a flexible plasma membrane and the relocation of chemiosmotic ATP synthesis to mitochondria, which liberated the plasma membrane for more complex electrical signalling involved in sensing and reacting. We conjecture that together with an increase in cell size, these new forms of excitability greatly amplified the degrees of freedom associated with cellular responses, allowing eukaryotes to vastly outperform prokaryotes in terms of both speed and accuracy. This comprehensive new perspective on the evolution of excitability enriches our view of eukaryogenesis and emphasizes behaviour and sensing as major contributors to the success of eukaryotes. This article is part of the theme issue ‘Basal cognition: conceptual tools and the view from the single cell’.

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Bewegungen

Haupt¹

1968

Fortschritte Der Botanik

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Taxis in Euglena

Cited by 6 publications

References 11 publications

Anion sensitivity of motility and step-down photophobic responses of Euglena gracilis

Anion sensitivity of motility and step-down photophobic responses of Euglena gracilis

Origins of eukaryotic excitability

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