Photosynthetic responses of Halophila stipulacea to a light gradient. II. Acclimations following transplantation

Sharon, Yoni; Silva, João; Santos, Rui; Runcie, John W.; Chernihovsky, Mark; Beer, Sven

doi:10.3354/ab00148

Cited by 44 publications

(44 citation statements)

References 17 publications

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“…Consequently, resources used for chloroplast movement in shallow plants can be reallocated to other processes. This capacity to acclimate during the day to elevated irradiance appears to be inducible, as shown by Sharon et al (2009), where translocated seagrasses assumed similar responses to those resident at each depth.…”

Section: Discussionmentioning

confidence: 97%

“…The specific objectives of the present study were to determine how excitation energy is allocated within H. stipulacea to photochemistry, down-regulation and basal intrinsic non-radiative decay processes when exposed to different irradiances (at various depths), and how the allocation to these processes varies during the onset of irradiance stress and recovery. A parallel study was also conducted to examine acclimatory responses of H. stipulacea transplanted across the 3 depths (Sharon et al 2009, this Theme Section).…”

Section: Introductionmentioning

confidence: 99%

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Photosynthetic responses of Halophila stipulacea to a light gradient. I. In situ energy partitioning of non-photochemical quenching

et al. 2009

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The quantum yield of photosystem II (φ II , also termed ΔF /F m ' or F v /F m in light-or darkacclimated plants, respectively) of the tropical seagrass Halophila stipulacea was measured in situ using modulated fluorescence techniques over diel periods at a range of depths. Photosynthetic electron transport rates (ETRs), as derived from φ II values at specific ambient photosynthetically available radiation (PAR) irradiances, increased in direct proportion to increasing irradiance in the morning and, at shallow sites (7 to 10 m), reached saturating rates and then declined in the afternoon with lower PAR-specific ETRs. On the other hand, plants at 32 to 33 m showed no saturation even at midday, and the percentage reduction in PAR-specific afternoon ETRs was less than that of the shallower plants. The use of an automated shutter in the measuring device enabled non-photochemical quenching due to down-regulation and basal intrinsic non-radiative decay to be distinguished. While midday values of down-regulation were lower in deeper water, basal intrinsic non-radioactive decay remained fairly constant at 30 to 40% at all depths, with more variation in shallow waters. The maximal φ II (i.e. F v /F m ) reached similar values at midnight regardless of depth. H. stipulacea acclimates to the widely varying irradiances across this depth gradient by regularly modulating down-regulationbased non-photochemical quenching processes, while dissipating a large proportion of light energy through intrinsic decay regardless of depth.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Photosynthetic responses of Halophila stipulacea to a light gradient. I. In situ energy partitioning of non-photochemical quenching

et al. 2009

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“…Commencing mixing 1 h prior to sunrise allowed the culture to be fully mixed at sunrise. This was done to investigate culture's response if it is fully mixed at the time of sunrise, when photosynthetic efficiency starts to rise until noon (Kurzbaum et al 2010;Sharon et al 2009). The three modes of operation were then maintained until the experiment concluded.…”

Section: Methodsmentioning

confidence: 99%

Comparison of continuous and day time only mixing on Tetraselmis suecica (Chlorophyta) in outdoor raceway ponds

et al. 2014

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The mixing of microalgae bioreactors is important as it circulates cells in and out of the light zone and reduces boundary layers, benefiting photosynthesis and nutrient uptake. However, mixing is also a major economical factor, impacting on power consumption and operating costs, and it remains a barrier for those locations where no electrical supply is available. Combining solar panels with algae ponds can help to alleviate the power cost burden, but if solar panels are the sole source of generated electricity for a regional raceway pond system, the paddle wheels will only operate during day time. This study investigated the growth of halophilic green alga Tetraselmis suecica, in outdoor paddle wheel-driven open ponds under three different mixing regimes. The first experimental condition was a continuously mixed regime, while in the second and third conditions, the paddle wheels were stopped overnight and restarted 1 h after sunrise or 1 h before sunrise, respectively. Growth rate, biomass productivity and cell weight showed no statistically significant difference during the period when the culture was growing under optimal environmental conditions. Chlorophyll fluorescence measurements of photosystem II maximum quantum yield in the light (F v ′/F m ′) over a 24-h period found no significant differences between cultures, further suggesting that under favourable conditions ceasing mixing overnight may have no undesirable impact on Tetraselmis health or productivity. These findings imply a potential 37 % power saving and a 33 % reduction in energy-associated costs. During a heat stress event, Tetraselmis was negatively impacted in all ponds to the same degree; however, the continuously mixed pond recovered faster than ponds that were not mixed overnight.

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“…In seagrasses, pulse amplitude modulated (PAM) fluorometry has been commonly used for studying the effects of environmental stressors on a suite of photophysiological parameters (Ralph et al 1998, Campbell et al 2006, Sharon et al 2009). Using PAM fluorometry, Massa et al (2009) correlated reductions in photosynthetic performance and survival of shoots following exposures to thermal stress.…”

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confidence: 99%

Effects of a simulated heat wave on photophysiology and gene expression of high- and low-latitude populations of Zostera marina

Winters¹,

Nelle²,

Fricke³

et al. 2011

Mar. Ecol. Prog. Ser.

105

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Photosynthetic responses of Halophila stipulacea to a light gradient. II. Acclimations following transplantation

Cited by 44 publications

References 17 publications

Photosynthetic responses of Halophila stipulacea to a light gradient. I. In situ energy partitioning of non-photochemical quenching

Photosynthetic responses of Halophila stipulacea to a light gradient. I. In situ energy partitioning of non-photochemical quenching

Comparison of continuous and day time only mixing on Tetraselmis suecica (Chlorophyta) in outdoor raceway ponds

Effects of a simulated heat wave on photophysiology and gene expression of high- and low-latitude populations of Zostera marina

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