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@article{568567,
author = {Bišová, Kateřina and Hendrychová, Jana and Cepák, Vladislav and Zachleder, Vilém},
article_location = {ČR},
article_number = {6},
keywords = {toxicity; Scenedesmus; growth; H1 kinases},
language = {eng},
issn = {0015-5632},
journal = {Folia Microbiologica},
title = {Cell growth and division processes are differentially sensitive to cadmium in Scenedesmus quadricauda},
volume = {48},
year = {2003}
}
TY - JOUR
ID - 568567
AU - Bišová, Kateřina - Hendrychová, Jana - Cepák, Vladislav - Zachleder, Vilém
PY - 2003
TI - Cell growth and division processes are differentially sensitive to cadmium in Scenedesmus quadricauda
JF - Folia Microbiologica
VL - 48
IS - 6
SP - 805-816
EP - 805-816
PB - Mikrobiologický ústav AV ČR Praha
SN - 00155632
KW - toxicity
KW - Scenedesmus
KW - growth
KW - H1 kinases
N2 - The effect of cadmium on growth processes (the accumulation of RNA, proteins and cell volume), cell cycle reproductive events (DNA replication, mitosis, protoplast fission and daughter?cell formation) and the regulatory activity of histone H1 kinases were monitored in synchronized cultures of the chlorococcal alga Scenedesmus quadricauda (Turp.) Bréb. Distinct dosage?dependent inhibitory effects of cadmium ions were found in individual growth and reproductive processes. At concentrations of about 60 mmol/L CdCl2, the growth processes were slowed after about half of the cell cycle but the cells grew to the same or larger size than did the untreated cells. At higher concentrations of CdCl2, the growth became progressively inhibited, being completely blocked at concentrations above 240 mmol/L CdCl2. Total RNA accumulation was the most sensitive growth process. Each of the reproductive events was a target for cadmium ions with increasing sensitivity in the following order: DNA replication, mitosis, protoplast fission, and daughter?cell formation. Throughout the entire experiment, the activity of "mitosis?specific" histone H1 kinases was negligible in the cadmium (60 mmol/L CdCl2) treated cultures, whilst that of the control culture varied, peaking just prior to nuclear divisions. The activity of "growth?associated" histone H1 kinases was not affected by cadmium ions. No effect was found if cadmium was present during the pre?commitment period. The longer the period in the presence of cadmium chloride, the more it caused the inhibition of reproductive events.
ER -
BIŠOVÁ, Kateřina, Jana HENDRYCHOVÁ, Vladislav CEPÁK and Vilém ZACHLEDER. Cell growth and division processes are differentially sensitive to cadmium in Scenedesmus quadricauda. \textit{Folia Microbiologica}. ČR: Mikrobiologický ústav AV ČR Praha, 2003, vol.~48, No~6, p.~805-816. ISSN~0015-5632.
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