Mechanisms to Avoid Photoinhibition in a Desiccation-Tolerant Cyanobacterium, Nostoc commune

Fukuda, S.; Yamakawa, R.; Hirai, Manabu; Kashino, Yasuhiro; Koike, Hiroyuki; Satoh, Kazuhiko

doi:10.1093/pcp/pcn018

Cited by 67 publications

(36 citation statements)

References 15 publications

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“…Contrary to many previous studies on desiccation injuries in Nostoc (Scherer et al 1984;Scherer & Zhong 1991;HAwes et al 1992;GAo et al 1998b;GAo & Ye 2007;FuKudA et al 2008), our experiments lasted almost three weeks. Our results, similar to those of DAvey 1989; HAwes et al 1992;Novis et al 2007, suggest that even a partially hydrated Nostoc commune s.l.…”

Section: Discussioncontrasting

confidence: 56%

In situ response of Nostoc commune s.l. colonies to desiccation in Central Svalbard, Norwegian High Arctic.

Kvíderová¹,

Elster²,

imek³

2011

Fottea

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Abstract:The effects of desiccation on photochemical processes and nitrogenase activity were evaluated in Nostoc commune s.l. colonies in situ from a wet thufur meadow at Petuniabukta, Billefjorden, Central Svalbard, during the 2009 arctic summer. The colonies were collected in the fully hydrated state, and were subjected to slow desiccation at ambient temperatures (5 -8°C) and low light (30 -80 µmol.m ). For each colony the weight, area, photochemical performance, and nitrogenase activity were determined at the beginning, as well as on every day during the first four days of the experiment; thereafter, on every second day until desiccation was complete. The photochemical performance was evaluated from variable chlorophyll fluorescence parameters (F V /F M , Φ PSII , qP, and NPQ), and the nitrogenase activity was estimated by an acetylene-ethylene reduction assay. A significant decrease in the photochemically active area was recorded from the third day, when the colony had lost approximately 40% of its original weight indicating some changes in the extracellular matrix, and stopped on the 14 th to 18 th day. No effects of the desiccation on the main photochemical parameters (F V /F M , Φ PSII , qP) were observed up to the sixth to eighth days of desiccation. Slightly lower values of F V /F M and Φ PSII recorded in fullyhydrated colonies could be caused by impaired diffusion of CO 2 into cells. The steep reduction of photochemical activity occurred between the eighth and tenth day of the experiment, when the colony had lost approximately 80% of its fully-hydrated weight. The nitrogenase activity was highest on the first day, probably due to improved diffusion of N 2 into cells, then declined, but was detectable until the sixth day of the experiment. Since Nostoc commune s.l. colonies were capable of photosynthesis and nitrogen fixation to the level of ca. 60% of its fullyhydrated weight, even partly-hydrated colonies contribute substantially to carbon and nitrogen cycling in the High Arctic wet meadow tundra ecosystem.

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Section: Discussioncontrasting

confidence: 56%

In situ response of Nostoc commune s.l. colonies to desiccation in Central Svalbard, Norwegian High Arctic.

Kvíderová¹,

Elster²,

imek³

2011

Fottea

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“…1993), represent a strategy to cope with repeated drought stress. Specifically for N. commune, these mechanisms make the species extremely desiccation and photoinhibition tolerant (Fukuda et al 2008).…”

Section: Discussionmentioning

confidence: 99%

Dehydration-induced responses of primary photosynthetic processes and spectral reflectance indices in Antarctic Nostoc commune

Barták¹,

Hazdrová²,

Skácelová³

et al. 2016

Czech Polar Rep.

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In this study, we investigated the relationship between relative water content (RWC) of N. commune colonies recorded during gradual dehydration and (i) normalized difference vegetation index (NDVI), (ii) photochemical reflectance index (PRI), and (iii) primary photochemical processes of photosynthesis, effective quantum yield of photosynthetic processes ( PSII ) in photosystem II particular. PRI increased from -0.05 to 0.02 with RWC decrease from 100% (full hydration) to 0% (dry state). NDVI showed somewhat curvilinear relationship with desiccation with minimum value of 0.25 found at 10% RWC. Negative effect of suprasaturation of N. commune colony with water on effective quantum yield ( PSII ) was found at RWC range 80-100%. At the RWC range,  PSII reached only 50 % of maximum found at RWC of 30%. In general, desiccation-response curve of showed polyphasic character with three main phases (phase I -constant  PSII values, phase II -an increase with desiccation at RWC 80-30%, and phase IIIsigmoidal decrease with desiccation at RWC 0-30%). Non-photochemical quenching (qN) of absorbed light energy showed triphasic dependence on RWC as well. qN showed constant values in the phase I, an increase (phase II), and constant values at severe dehydration (phase III).

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“…Its thalli covered up to 50% of uncovered, moist soil in the analyzed habitats. In polar regions N. commune may occur in a water environment in associ− ation with mosses, but, above all, it is an obligatory taxon for surface habitats (Howard−Williams et al 1986;Fumanti et al 1995;Hirai et al 2004, Fukunda et al 2008, Komárek J. and Elster 2008Komárek O. and Komárek J. 2010).…”

Section: Resultsmentioning

confidence: 99%

Relationship of cyanobacterial and algal assemblages with vegetation in the high Arctic tundra (West Spitsbergen, Svalbard Archipelago)

Richter¹,

Pietryka²,

Matuła³

2015

Polish Polar Research

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Abstract:The paper presents the results of a study of cyanobacteria and green algae assem− blages occurring in various tundra types determined on the basis of mosses and vascular plants and habitat conditions. The research was carried out during summer in the years 2009-2013 on the north sea−coast of Hornsund fjord (West Spitsbergen, Svalbard Archipel− ago). 58 sites were studied in various tundra types differing in composition of vascular plants, mosses and in trophy and humidity. 141 cyanobacteria and green algae were noted in the research area in total. Cyanobacteria and green algae flora is a significant element of many tundra types and sometimes even dominate there. Despite its importance, it has not been hitherto taken into account in the description and classification of tundra. The aim of the present study was to demonstrate the legitimacy of using phycoflora in supplementing the descriptions of hitherto described tundra and distinguishing new tundra types. Numeric hierarchical−accumulative classification (MVSP 3.1 software) methods were used to ana− lyze the cyanobacterial and algal assemblages and their co−relations with particular tundra types. The analysis determined dominant and distinctive species in the communities in con− cordance with ecologically diverse types of tundra. The results show the importance of these organisms in the composition of the vegetation of tundra types and their role in the ecosystems of this part of the Arctic.

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Mechanisms to Avoid Photoinhibition in a Desiccation-Tolerant Cyanobacterium, Nostoc commune

Cited by 67 publications

References 15 publications

In situ response of Nostoc commune s.l. colonies to desiccation in Central Svalbard, Norwegian High Arctic.

In situ response of Nostoc commune s.l. colonies to desiccation in Central Svalbard, Norwegian High Arctic.

Dehydration-induced responses of primary photosynthetic processes and spectral reflectance indices in Antarctic Nostoc commune

Relationship of cyanobacterial and algal assemblages with vegetation in the high Arctic tundra (West Spitsbergen, Svalbard Archipelago)

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