Variety of cell cycle patterns in the alga Scenedesmus quadricauda (Chlorophyta) as revealed by application of illumination regimes and inhibitors

Zachleder, Vilém; Bišová, Kateřina; Vítová, Milada; Kubín, Š.; Hendrychová, Jana

doi:10.1017/s0967026202003815

Cited by 36 publications

(25 citation statements)

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“…At the end of the precommitment period (3 h), the maximum efficiency of energy capture by PS II reaction centres occurred, whereas the effective quantum efficiency of PS II (ÈPS II) was maximal at the same time as the second commitment point after 6 h. Claquin et al (2004) found that, in a quite different organism (the marine diatom Cylindrotheca fusiformis), photosynthetic capacity was highest during the G 1 -phase of the cell cycle. Unfortunately, in organisms dividing by multiple fission such as Desmodesmus, it is very difficult to distinguish clearly between successive G 1 -phases because individual sequences of growth and reproductive steps overlap each other to an extent that is strongly dependent on the growth conditions (Tukaj et al, 1996;Zachleder et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…This means that cells of these algae can perform more than one sequence of growth and reproductive processes, so that the classical cell cycle model (binary fission) must be modified to take into account the overlapping or parallel courses of entire phases of consecutive sequences of growth and reproductive events (Sˇetlı´k & Zachleder, 1984). The individual sequences consist of a growth step leading to the doubling of the cell biomass (RNA, proteins, dry weight, cell volume), shortly followed by the duplication of the corresponding replication structures (DNA, nucleus, protoplasts, autospores;Zachleder et al, 2002). The extent of these partly overlapping sequences, as well as their number during one cell cycle, may be governed by the growth conditions, and particularly irradiance and light:dark regime (Tukaj et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

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Relationships between growth, development and photosynthetic activity during the cell cycle ofDesmodesmus armatus(Chlorophyta) in synchronous cultures

Matusiak-Mikulin

Tukaj

2006

European Journal of Phycology

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The ultrastructural changes observed under an electron microscope, growth and biomass production expressed as the dry matter:cell volume ratio (DM:CV), as well as the photosynthetic activity characterized by chlorophyll fluorescence, of Desmodesmus armatus have been monitored in a synchronized light:dark (14 h:10 h) regime cell cycle. The timing of the commitment points triggering the reproductive processes and their termination were characterized by the commitment and autospore release curves, respectively. During the light period, each cell attained three commitment points in the 3rd, 6th and 11th hour, which resulted in the formation of eight autospores released from the parent cell during the dark period of the cell cycle. The successive commitment points occurred at times when DM:CV reached extreme values. The maximum DM:CV in the middle of the light period (5-6 h) coincided with the maximum effective quantum efficiency of PS II (ÈPS II). At this time, bands of several thylakoids could be seen in some areas of chloroplast, which were closer to each other and more contrasted than in other phases of the cell cycle. The highest efficiency of PS II antennae (F (qP) increased slightly, whereas non-photochemical quenching (NPQ) rapidly decreased during the first 3 h of the cell cycle. The main contributor to NPQ was its energydependent component (qE). In the 11 th hour, cells started to accumulate starch grains and lipid droplets, which were partly (starch) or completely (lipids) utilized during the first few hours of the next cell cycle. In conjunction with the ultrastructural changes, two functionally different phases of the cell cycle could be distinguished: the vegetative (about 10 h) and the reproductive (about 4 h) phases, and the relationships between growth, reproduction and photosynthesis in the Desmodesmus cell cycle are discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relationships between growth, development and photosynthetic activity during the cell cycle ofDesmodesmus armatus(Chlorophyta) in synchronous cultures

Matusiak-Mikulin

Tukaj

2006

European Journal of Phycology

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“…temperature controls the size of the cells of Scenedesmus quadricauda: 14 (Komárek & Růžička, 1969;Komárek & Marvan, 1979). The number of cells in the cenobium is controlled by light intensity, from 2 (high temperature and low light) to 8 (optimal conditions), which controls the number of sequences of the cell cycle and reproductive events (Zachleder et al, 2002). Different sizes and the morphology of the cells and cenobia, of the same alga, were obtained in different combinations of temperature and light e.g., on a cultivation unit with a crossed gradients board (Lukavský, 1982).…”

Section: S487mentioning

confidence: 99%

Coelastrum pascheri sp. n., a new green alga from lakes of the Bohemian Forest

Lukavský

2006

Biologia

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Coelastrum pascheri sp. n. is described. It is similar to Coelastrum morus W. et G. S. West sensu Skuja (1930) in the morphology of the free processes, but differs from it in cell size (it is significantly smaller, 13-16 µm) and in the number of cells in a cenobium (usually 4). The new alga was found in the littoral of some lakes: Černé jezero (Černé Lake), Grosser Arbersee and Kleiner Arbersee in the Bohemian Forest (Šumava, Böhmerwald) and also in Sphagnum within a small puddle in the Upolínová meadow in the Slavkovský les Mts.

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“…Cycloheximide is an alicyclic glutarimide antibiotic inhibiting water and ion uptake by the roots, and the stomatal conductivity (Voicu & Zwiazek 2003). It was also used to disturb the coordination of growth and organelle reproductive processes in the studies of cell cycle in algae (Zechleder et al 2002). Pjon et al (1992) reported that cycloheximide promoted chlorophyll loss from detached komatsuna (Brassica campestris cv.…”

Section: Introductionmentioning

confidence: 99%

Changes in photosynthetic apparatus of mustard (Sinapis alba) cotyledons following cycloheximide and kinetin treatments

2008

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Biochemical and accompanying structural characteristics of the photosynthetic process were studied in mustard seedlings cultivated on medium with increasing concentrations of cycloheximide alone as well as in combination with various kinetin concentrations. After 7 days of cultivation the contents of total chlorophyll, carotenoids and content of Rubisco in mustard cotyledons were determined. The content of chlorophyll pigments and carotenoids decreased in dependence of cycloheximide concentration. Following antibiotic treatment the content of both Rubisco subunits markedly decreased. In addition cycloheximide caused disturbance in mesophyll organization and chloroplast ultrastructure. Kinetin applied with cycloheximide increased the amount of photosynthetic pigments as well as of Rubisco, compared to the cycloheximide alone. In the seedlings treated with cycloheximide+kinetin the structure of leaf mesophyll and chloroplast membrane system was similar to control. Our results indicate that kinetin diminished the negative effects of cycloheximide on photosynthetic pigments and Rubisco as well as on the structural traits of the cotyledons.

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Variety of cell cycle patterns in the alga Scenedesmus quadricauda (Chlorophyta) as revealed by application of illumination regimes and inhibitors

Cited by 36 publications

References 0 publications

Relationships between growth, development and photosynthetic activity during the cell cycle ofDesmodesmus armatus(Chlorophyta) in synchronous cultures

Relationships between growth, development and photosynthetic activity during the cell cycle ofDesmodesmus armatus(Chlorophyta) in synchronous cultures

Coelastrum pascheri sp. n., a new green alga from lakes of the Bohemian Forest

Changes in photosynthetic apparatus of mustard (Sinapis alba) cotyledons following cycloheximide and kinetin treatments

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