RELATIONSHIP OF GROWTH AND PHOTOSYNTHESIS WITH COLONY SIZE IN AN EDIBLE CYANOBACTERIUM, GE‐XIAN‐MI <i>NOSTOC</i> (CYANOPHYCEAE)<sup>1</sup>

Gao, Kunshan; Ai, Hongxia

doi:10.1111/j.1529-8817.2004.03155.x

Cited by 27 publications

(22 citation statements)

References 19 publications

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“…Our results also confirmed previously presented data (GAo & Ai 2004), that smaller colonies lost their water faster than the larger ones, due to their higher surface/volume ratios. Although higher photosynthesis rates can be expected in smaller colonies such as in Nostoc sphaeroides (GAo & Ai 2004;Li & GAo 2004), no credibly higher photochemical parameters (F V /F M , Φ PSII , qP and NPQ) were observed in our experiments. In the field, the largest colonies could be metabolically active through relatively long dry periods.…”

Section: Discussionsupporting

confidence: 82%

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: Discussionsupporting

confidence: 82%

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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“…Such contact allows to slow down desiccation and prolong the time of photosynthetic activity. In the field, size of N. commune colony may play a role since a faster desiccation in small-area colonies is reported (Gao et Ai 2004). It has been demonstrated earlier that Nostoc colonies decrease their mean diameter from 150-250 µm to 50-100 µm during desiccation from wet to dry state (Belnap et Gardner 1993).…”

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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“…The thick surface of the thallus has significant shading effects on its inner structure (Raven and Kübler 2002). Dodds et al (1995) reported that 90 % of the incident light is absorbed by the 100 lm-thick algal filament on the surface of Nostoc while the inner algal filament was shown to receive only minimal light (Gao and Ai 2004).…”

Section: Introductionmentioning

confidence: 99%

Effects of light intensity and quality on phycobiliprotein accumulation in the cyanobacterium Nostoc sphaeroides Kützing

Lü

et al. 2015

Biotechnol Lett

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Objectives To assess the effects of light intensity and quality on the growth and phycobiliproteins (PBP) accumulation in Nostoc sphaeroides Kützing (N. sphaeroides). Results Dry weights, dry matter, protein, chlorophyll and PBP contents were higher under 90 lmol m -2 s -1 than under other intensities (both higher and lower). Phycocyanin and allophycocyanin increased with light intensity while phycoerythrin decreased. Fresh weights, protein and PBP contents increased at the highest rates under blue light. Red light resulted in higher values of dry matter, phycocyanin and chlorophyll a. Conclusion White light at 90 lmol m -2 s -1 or blue light 30 lmol m -2 s -1 were optimal for the growth and phycobiliprotein accumulation in N. sphaeroides.

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RELATIONSHIP OF GROWTH AND PHOTOSYNTHESIS WITH COLONY SIZE IN AN EDIBLE CYANOBACTERIUM, GE‐XIAN‐MI NOSTOC (CYANOPHYCEAE)¹

Cited by 27 publications

References 19 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

Effects of light intensity and quality on phycobiliprotein accumulation in the cyanobacterium Nostoc sphaeroides Kützing

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RELATIONSHIP OF GROWTH AND PHOTOSYNTHESIS WITH COLONY SIZE IN AN EDIBLE CYANOBACTERIUM, GE‐XIAN‐MI NOSTOC (CYANOPHYCEAE)1

Cited by 27 publications

References 19 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

Effects of light intensity and quality on phycobiliprotein accumulation in the cyanobacterium Nostoc sphaeroides Kützing

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RELATIONSHIP OF GROWTH AND PHOTOSYNTHESIS WITH COLONY SIZE IN AN EDIBLE CYANOBACTERIUM, GE‐XIAN‐MI NOSTOC (CYANOPHYCEAE)¹