Algae Know the Time of Day: Circadian and Photoperiodic Programs

Suzuki, Lena; Johnson, Carl Hirschie

doi:10.1046/j.1529-8817.2001.01094.x

Cited by 87 publications

(55 citation statements)

References 73 publications

(104 reference statements)

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“…3b). While it has been demonstrated that virtually all stages of photosynthesis exhibit circadian control (Suzuki and Johnson, 2001), our results sug-gests that ETR RCII responds more directly to changes in light availability than the subsequent conversion of light energy into cellular organic carbon. It is important to note that the accumulation of photodamage and inhibition over the course of the light period is likely to impart some level of hysteresis to diurnal changes in ETR RCII .…”

Section: Diurnal Changes In Etr Rcii and The Conversionmentioning

confidence: 46%

Diurnal variation in the coupling of photosynthetic electron transport and carbon fixation in iron-limited phytoplankton in the NE subarctic Pacific

et al. 2016

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Abstract. Active chlorophyll a fluorescence approaches, including fast repetition rate fluorometry (FRRF), have the potential to provide estimates of phytoplankton primary productivity at an unprecedented spatial and temporal resolution. FRRF-derived productivity rates are based on estimates of charge separation in reaction center II (ETR RCII ), which must be converted into ecologically relevant units of carbon fixation. Understanding sources of variability in the coupling of ETR RCII and carbon fixation provides physiological insight into phytoplankton photosynthesis and is critical for the application of FRRF as a primary productivity measurement tool. In the present study, we simultaneously measured phytoplankton carbon fixation and ETR RCII in the iron-limited NE subarctic Pacific over the course of a diurnal cycle. We show that rates of ETR RCII are closely tied to the diurnal cycle in light availability, whereas rates of carbon fixation appear to be influenced by endogenous changes in metabolic energy allocation under iron-limited conditions. Unsynchronized diurnal oscillations of the two rates led to 3.5-fold changes in the conversion factor between ETR RCII and carbon fixation (K c /n PSII ). Consequently, diurnal variability in phytoplankton carbon fixation cannot be adequately captured with FRRF approaches if a constant conversion factor is applied. Utilizing several auxiliary photophysiological measurements, we observed that a high conversion factor is associated with conditions of excess light and correlates with the increased expression of non-photochemical quenching (NPQ) in the pigment antenna, as derived from FRRF measurements. The observed correlation between NPQ and K c /n PSII requires further validation but has the potential to improve estimates of phytoplankton carbon fixation rates from FRRF measurements alone.

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Section: Diurnal Changes In Etr Rcii and The Conversionmentioning

confidence: 46%

Diurnal variation in the coupling of photosynthetic electron transport and carbon fixation in iron-limited phytoplankton in the NE subarctic Pacific

et al. 2016

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“…Lu¨ning 1994aLu¨ning , 2001Granbom et al 2001;Suzuki and Johnson 2001;Jacobsen et al 2003). Seasonal growth pattern in Laminariales is shown to be environmentally as well as internally controlled (Lu¨ning 1993(Lu¨ning , 1994b.…”

Section: Discussionmentioning

confidence: 99%

“…In UVR-exposed Alaria sporophytes, higher growth rates even occurred during the dark phase, compared to the early morning and late afternoon light phase without UVR. It has been hypothesized that the driving force for the early evolution of circadian clocks could be an inherent advantage in phasing cellular events that are inhibited by sunlight to occur in the night (Suzuki and Johnson 2001). If this regulation by a circadian clock is adaptive, growth during the day in the absence of UV stress may be enhanced equal to but not greater than the growth at night.…”

Section: Discussionmentioning

confidence: 99%

Growth kinetics related to physiological parameters in young Saccorhiza dermatodea and Alaria esculenta sporophytes exposed to UV radiation

Roleda

Hanelt²,

Wiencke

2005

Polar Biol

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Young sporophytes of Saccorhiza dermatodea and Alaria esculenta cultured from Spitsbergen isolates were exposed in the laboratory to either only photosynthetically active radiation (PAR) or to a spectrum including UV-radiation (PAR+UVA+UVB) by use of cutoff glass filters. The plants were grown at 8±2°C and 16:8 h light-dark cycles with 6 h additional UV exposure in the middle of the light period. Growth was measured every 10 min using growth chambers with online video measuring technique for 18-21 days. Tissue morphology and absorption spectra were measured in untreated young sporophytes while tissue chlorophyll-a content and DNA damage were measured from treated thalli at the end of the experiment. Under UVR, growth rates of S. dermatodea were significantly reduced while A. esculenta have a potential to acclimate. Tissue chlorophyll-a contents in both species were not significantly different between treatments suggesting that these algae may acclimate to moderate UVR fluence. Higher DNA damage in S. dermatodea effectively diverted photosynthetic products for repair constraining growth. Tissue optics (opacity and translucence) was correlated to the tissue absorbance in the UVR region characteristics of phlorotannin, an important UV-absorbing compound in brown macroalgae. Growth rates of sporophytes of both species exposed to PAR without UV was similar during day and night. The results showed that both species can recruit and inhabit a similar coastal zone when appropriate strategies are expressed to minimize damage in response to the stress factor.

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“…3b). Circadian rhythms are well documented across the Tree of Life (Wijnen andYoung 2006, Rosbash 2009), and algae clearly can tell the time of day (Suzuki and Johnson 2001). Ascending swimming movements by these phytoflagellates often began before sunrise and before first light at depth (Fig.…”

Section: Discussionmentioning

confidence: 99%

A 21-year record of vertically migrating subepilimnetic populations of Cryptomonas spp.

deNoyelles

Smith

Kastens

et al. 2016

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The vertical distribution and diel migration of Cryptomonas spp. were monitored continuously for 21 years in mesotrophic Cross Reservoir, northeast Kansas, USA. The movements of these motile algae were tracked on multiple dates during July-October of each year using in situ fluorometry and optical microscopy of Lugol's iodine-preserved samples. Episodes of subepilimnetic diel vertical migration by Cryptomonas were detected and recorded on 221 different days between 1994 and 2014, with just 2 of these years (1998 and 2013) lacking any sampling events with deep peaks sufficiently large enough to track. Whenever a subepilimnetic layer of Cryptomonas was detectable, it was generally observed to ascend toward the bottom of the epilimnion beginning approximately at sunrise; to descend toward the lake bottom during the late afternoon and evening; and to remain as a deep-dwelling population until dawn of the following day. Moreover, there was high day-to-day consistency in the absolute water column depths at which the migrating algal cells would cease their ascending or descending movement. We believe this unique and remarkable dataset comprises the most detailed record of diel migratory behavior for any planktonic freshwater alga reported for a single freshwater lake.

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Algae Know the Time of Day: Circadian and Photoperiodic Programs

Cited by 87 publications

References 73 publications

Diurnal variation in the coupling of photosynthetic electron transport and carbon fixation in iron-limited phytoplankton in the NE subarctic Pacific

Diurnal variation in the coupling of photosynthetic electron transport and carbon fixation in iron-limited phytoplankton in the NE subarctic Pacific

Growth kinetics related to physiological parameters in young Saccorhiza dermatodea and Alaria esculenta sporophytes exposed to UV radiation

A 21-year record of vertically migrating subepilimnetic populations of Cryptomonas spp.

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