Environmental factors affectingin vitro nitrogenase activity of cyanobacteria isolated from rice-fields

Prósperi, C.; Boluda, L.; Luna, Claudia Verónica; Fernández‐Valiente, Eduardo

doi:10.1007/bf02161205

Cited by 21 publications

(11 citation statements)

References 11 publications

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“…The changes of pH can reach values of about 10-10.5 at the moment of maximal photosynthetic activity (Whitton et al 1988;Prosperi et al 1992). So we considered two extreme light intensities and three different pH values.…”

Section: Resultsmentioning

confidence: 99%

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Variation of nitrogenase activity, photosynthesis and pigmentation of the cyanobacterium Fischerella ambigua strain FS18 under different irradiance and pH values

Soltani

Khavari-Nejad

Yazdi

et al. 2006

World J Microbiol Biotechnol

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Our objective was to evaluate the physiological response of Fischerella ambigua FS18 to the combined influence of pH (5, 7 and 9) and light intensity (3 and 300 lmol photon m )2 s )1 ). Growth rates were similar at pH 9 and pH 7. There was no growth at pH 5. Increasing light intensity did not have any considerable influence on growth rates. Chlorophyll concentration was higher at pH 7 at all light intensities. Chlorophyll concentration decreased with increasing light intensity from 3 to 300 lmol photon m )2 s )1 . Synthesis of the phycobiliproteins (PBP), phycocyanin (PC) and allophycocyanin (APC) had the highest rate in pH 7. Increasing irradiance decreased the concentrations of all PBPs. The light-saturated photosynthetic rate was clearly higher at high light intensity. With respect to nitrogenase activity, the highest rate was at pH 9 and 300 lmol photon m )2 s )1 . Irradiance did not affect significantly this activity at pH 7. This cyanobacterium seems to be alkalophilic with maximum nitrogenase activity and photosynthesis at pH 9. It can also adapt its photosynthetic apparatus to the variable factors that are found in rice fields.

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Section: Resultsmentioning

confidence: 99%

“…However, there is increasing evidence that the effects of one environmental factor can be modulated by variation of other factors (Legane´s & Ferna´ndez Valiente 1991;Prosperi et al 1992;Mu¨ller et al 1993;Poza-Carrio´n et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Variation of nitrogenase activity, photosynthesis and pigmentation of the cyanobacterium Fischerella ambigua strain FS18 under different irradiance and pH values

Soltani

Khavari-Nejad

Yazdi

et al. 2006

World J Microbiol Biotechnol

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“…Dehning and Tilzer (1989) reported that Scenedesmus acuminatus could survive during a prolonged period of darkness by reducing its catabolic reactions. Moreover, some soil chlorophytes and cyanophytes, including one isolate from rice fields, are known to grow by using organic compounds under dark and anaerobic conditions (Groover and Bold 1969;Metting 1980;Prosperi et al 1992). The results of this study show that a large number of microalgae survive under dark conditions in subsurface soil.…”

Section: Discussionmentioning

confidence: 70%

Variations in the microalgal structure in paddy soil in Osaka, Japan: comparison between surface and subsurface soils

Fujita

Nakahara

2006

Limnology

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“…Because of the high SRP concentrations found, it seems not to be growth-limiting in this ecosystem. On the contrary, N compounds are modulating nitrogen-fixing cyanobacterial populations, since nitrogenase activity is, at least partially, inhibited by high ambient DIN concentrations in rice fields [14].…”

Section: Discussionmentioning

confidence: 99%

Relationship between abundance of N2-fixing cyanobacteria and environmental features of Spanish rice fields

Quesada

Valiente

1996

Microb Ecol

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In order to estimate the potential utilization of N2-fixing (heterocystous) cyanobacteria as natural biofertilizers in the Valencian rice fields (Spain), the distribution and seasonal variation of these microorganisms in water and sediment samples were evaluated, and the relationships among cyanobacterial abundance and physical and chemical characteristics of soil and water were investigated. N2-fixing cyanobacteria were present in all the samples analyzed (25 sampling points sampled three times per year during two years). The relative cyanobacterial abundance in soil and water followed contrasting patterns, maximum presence in soil coincided with minimum abundance in water. Correlation analysis showed that cyanobacterial abundance in the two phases (water and sediment) was influenced more by water than by soil properties. Salinity, mineralization variables, and soluble reactive phosphate (SRP) correlated positively with heterocystous cyanobacteria presence. Furthermore, dissolved inorganic nitrogen (DIN) and the ratio DIN:SRP correlated negatively with cyanobacterial abundance. However DIN: SRP ratio better described the cyanobacterial distribution, with a threshold effect: below the Redfield ratio value (7.2 in mass units) cyanobacterial abundance was clearly higher.

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Environmental factors affectingin vitro nitrogenase activity of cyanobacteria isolated from rice-fields

Cited by 21 publications

References 11 publications

Variation of nitrogenase activity, photosynthesis and pigmentation of the cyanobacterium Fischerella ambigua strain FS18 under different irradiance and pH values

Variation of nitrogenase activity, photosynthesis and pigmentation of the cyanobacterium Fischerella ambigua strain FS18 under different irradiance and pH values

Variations in the microalgal structure in paddy soil in Osaka, Japan: comparison between surface and subsurface soils

Relationship between abundance of N2-fixing cyanobacteria and environmental features of Spanish rice fields

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