What is the role and nature of programmed cell death in phytoplankton ecology?

Franklin, Daniel J.; Berges, John A.

doi:10.1080/09670260500505433

Cited by 169 publications

(162 citation statements)

References 113 publications

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“…This is supported by the observation that the greatest release of DOM occurs during the transition between different phases of phytoplankton growth (Granum et al 2002;Wetz & Wheeler, 2007), which was explained by Williams (1990) as a 'temporary loss of control' of the organic matter pools within the cell as growth rate slows down. It is rarely considered that other processes, such as phytoplankton cell death resulting in lysis (Franklin et al, 2006), may also affect the release of DOM in batch cultures. In addition, there may be taxonomic differences: Skeletonema costatum and Phaeocystis sp.…”

Section: Overflow Hypothesismentioning

confidence: 99%

“…The ecological significance of autocatalytic cell death of phytoplankton is unknown and there is much to be learnt about the physiology of the process (Bidle & Falkowski, 2004, Franklin et al, 2006. It is well established that cell membranes become more 'leaky' during cell death ( Fig.…”

Section: Physiology Of Phytoplankton Dom Releasementioning

confidence: 99%

“…Recent research has shown that phytoplankton also undergo the physiological process of autocatalytic cell-suicide, which can lead to lysis of the cells; this process is analogous to programmed cell death (PCD) in metazoans (Bidle & Falkowski, 2004;Franklin et al, 2006). Autocatalytic cell death is a process that is indicated by multiple changes within the phytoplankton cell and it is often difficult to characterize such cells as clearly dead or alive (Franklin et al, 2006(Franklin et al, , 2012. Cell membrane integrity is used as an early indicator of cell death (Veldhuis et al, 2001).…”

Section: Autocatalytic Cell Deathmentioning

confidence: 99%

“…It was generally assumed that individual phytoplankton cell lines were immortal unless an external factor (predation, viral infection or sinking into prolonged darkness) caused their death (Kirchman, 1999;Bidle & Falkowski, 2004;Franklin et al, 2006). Recent research has shown that phytoplankton also undergo the physiological process of autocatalytic cell-suicide, which can lead to lysis of the cells; this process is analogous to programmed cell death (PCD) in metazoans (Bidle & Falkowski, 2004;Franklin et al, 2006). Autocatalytic cell death is a process that is indicated by multiple changes within the phytoplankton cell and it is often difficult to characterize such cells as clearly dead or alive (Franklin et al, 2006(Franklin et al, , 2012.…”

Section: Autocatalytic Cell Deathmentioning

confidence: 99%

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Dissolved organic matter (DOM) release by phytoplankton in the contemporary and future ocean

Thornton

2014

European Journal of Phycology

365

311

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The partitioning of organic matter (OM) between dissolved and particulate phases is an important factor in determining the fate of organic carbon in the ocean. Dissolved organic matter (DOM) release by phytoplankton is a ubiquitous process, resulting in 2-50% of the carbon fixed by photosynthesis leaving the cell. This loss can be divided into two components: passive leakage by diffusion across the cell membrane and the active exudation of DOM into the surrounding environment. At present there is no method to distinguish whether DOM is released via leakage or exudation. Most explanations for exudation remain hypothetical; as while DOM release has been measured extensively, there has been relatively little work to determine why DOM is released. Further research is needed to determine the composition of the DOM released by phytoplankton and to link composition to phytoplankton physiological status and environmental conditions. For example, the causes and physiology of phytoplankton cell death are poorly understood, though cell death increases membrane permeability and presumably DOM release. Recent work has shown that phytoplankton interactions with bacteria are important in determining both the amount and composition of the DOM released. In response to increasing CO 2 in the atmosphere, climate change is creating increasingly stressful conditions for phytoplankton in the surface ocean, including relatively warm water, low pH, low nutrient supply and high light. As ocean physics and chemistry change, it is hypothesized that a greater proportion of primary production will be released directly by phytoplankton into the water as DOM. Changes in the partitioning of primary production between the dissolved and particulate phases will have bottom-up effects on ecosystem structure and function. There is a need for research to determine how these changes affect the fate of organic matter in the ocean, particularly the efficiency of the biological carbon pump.

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Section: Overflow Hypothesismentioning

confidence: 99%

Section: Physiology Of Phytoplankton Dom Releasementioning

confidence: 99%

Section: Autocatalytic Cell Deathmentioning

confidence: 99%

Section: Autocatalytic Cell Deathmentioning

confidence: 99%

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Dissolved organic matter (DOM) release by phytoplankton in the contemporary and future ocean

Thornton

2014

European Journal of Phycology

365

311

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“…However, it has become evident that phytoplankton can also be lost through several factors such as viral infection (Fuhrman, 1999;Castberg et al, 2001) and programmed cell death in response to environmental stress (Dunn et al, 2002;Bidle and Falkowski, 2004;Franklin et al, 2006). For example, van Boekel et al (1992) showed that nitrate depletion induced cell lysis of Phaeocystis, which led to the termination of their blooms in the North Sea.…”

Section: Introductionmentioning

confidence: 99%

Differences in cell viabilities of phytoplankton between spring and late summer in the northwest Pacific Ocean

Hayakawa¹,

Suzuki²,

Saito³

et al. 2008

Journal of Experimental Marine Biology and Ecology

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Enzymatic cell disruption of microalgae biomass in biorefinery processes

Demuez

Mahdy

Tomás‐Pejó

et al. 2015

Biotech & Bioengineering

150

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When employing biotechnological processes for the procurement of biofuels and bio-products from microalgae, one of the most critical steps affecting economy and yields is the "cell disruption" stage. Currently, enzymatic cell disruption has delivered effective and cost competitive results when compared to mechanical and chemical cell disruption methods. However, the introduction of enzymes implies additional associated cost within the overall process. In order to reduce this cost, autolysis of microalgae is proposed as alternative enzymatic cell disruption method. This review aims to provide the state of the art of enzymatic cell disruption treatments employed in biorefinery processes and highlights the use of endopeptidases. During the enzymatic processes of microalgae life cycle, some lytic enzymes involved in cell division and programmed cell death have been proven useful in performing cell lysis. In this context, the role of endopeptidases is emphasized. Mirroring these natural events, an alternative cell disruption approach is proposed and described with the potential to induce the autolysis process using intrinsic cell enzymes. Integrating induced autolysis within biofuel production processes offers a promising approach to reduce overall global costs and energetic input associated with those of current cell disruption methods. A number of options for further inquiry are also discussed.

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What is the role and nature of programmed cell death in phytoplankton ecology?

Cited by 169 publications

References 113 publications

Dissolved organic matter (DOM) release by phytoplankton in the contemporary and future ocean

Dissolved organic matter (DOM) release by phytoplankton in the contemporary and future ocean

Differences in cell viabilities of phytoplankton between spring and late summer in the northwest Pacific Ocean

Enzymatic cell disruption of microalgae biomass in biorefinery processes

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