Authors: Milada Vítová Kateřina Bišová Monika Hlavová Shigeyuki Kawano Vilém Zachleder Mária Čížková
Publish Date: 2011/05/15
Volume: 234, Issue: 3, Pages: 599-608
Abstract
Synchronized cultures of the green alga Chlamydomonas reinhardtii were grown photoautotrophically under a wide range of environmental conditions including temperature 15–37°C different mean light intensities 132 150 264 μmol m−2 s−1 different illumination regimes continuous illumination or alternation of light/dark periods of different durations and culture methods batch or continuous culture regimes These variable experimental approaches were chosen in order to assess the role of temperature in the timing of cell division the length of the cell cycle and its pre and postcommitment phases Analysis of the effect of temperature from 15 to 37°C on synchronized cultures showed that the length of the cell cycle varied markedly from times as short as 14 h to as long as 36 h We have shown that the length of the cell cycle was proportional to growth rate under any given combination of growth conditions These findings were supported by the determination of the temperature coefficient Q 10 whose values were above the level expected for temperaturecompensated processes The data presented here show that cell cycle duration in C reinhardtii is a function of growth rate and is not controlled by a temperature independent endogenous timer or oscillator including a circadian oneThis work was supported by grants from Agency of the Academy of Sciences of the Czech Republic the program of internal support of the projects of international cooperation No M200200904 Grant No A500200614 the Grant Agency of the Czech Republic Grant Nos 525/09/0102 204/09/0111 and the Institutional Research Concepts No AV0Z50200510 funded by the Academy of Sciences of the Czech Republic
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