Fox- and Fix- mutants of Anabaena 7120 defective in heterocyst development and nitrogen fixation

2003 ◽  
Vol 108 ◽  
pp. 75-85
Author(s):  
Arun K. Mishra
Keyword(s):  
Nitrogen Fixation ◽  
Anabaena 7120 ◽  
Heterocyst Development

Monitoring energy conversion in photosystem I of cyanobacterial heterocysts by photoacoustic spectroscopy

1986 ◽  
Vol 64 (9) ◽  
pp. 1136-1138 ◽  
Author(s):  
Robert Carpentier ◽  
Hans C. P. Matthijs ◽  
Roger M. Leblanc ◽  
Geoffrey Hind
Keyword(s):  
Nitrogen Fixation ◽  
Electron Transport ◽  
Energy Conversion ◽  
Gas Phase ◽  
Photosystem I ◽  
Photoacoustic Spectroscopy ◽  
Cyclic Electron Transport ◽  
Optimal Conditions ◽  
Anabaena 7120 ◽  
Cyanobacterium Anabaena

Photoacoustic spectroscopy was used to monitor photosynthetic energy storage in heterocysts isolated from the cyanobacterium Anabaena 7120. Three main energy-conversion pathways have been identified in these specialized cells: cyclic electron transport in photosystem I, nitrogen fixation, and respiration. The aim of this study was to define the conditions for estimating their interdependence. The gas phase (air, Ar, N2, H2) under which the sample was prepared or incubated, as well as the presence of electron donors (NADPH, NADH, H2) and KCN (an inhibitor of respiration), determined the relative flux through the pathways. Heterocysts in which respiration and nitrogen fixation are inhibited have afforded a useful system for specific study of cyclic electron transport around photosystem I. Under optimal conditions for photosystem I turnover, photochemical losses of above 20% were found.

Factors controlling nitrogen fixation in temperate seagrass beds

2015 ◽  
Vol 525 ◽  
pp. 41-51 ◽  
Author(s):  
PLM Cook ◽  
V Evrard ◽  
RJ Woodland
Keyword(s):  
Nitrogen Fixation ◽  
Seagrass Beds

NEW CLOVER CULTIVARS FOR WAIKATO DAIRY PASTURE: ESTABLISHMENT, PRODUCTION AND NITROGEN FIXATION DURING THE FIRST YEAR

1988 ◽  
pp. 207-211
Author(s):  
S.F. Ledgard ◽  
G.J. Brier ◽  
R.N. Watson
Keyword(s):  
Nitrogen Fixation ◽  
White Clover ◽  
Dairy Cow ◽  
Red Clover ◽  
First Year ◽  
Buried Seed

Clover cultivars grown with ryegrass were compared in an establishment year under dairy cow grazing. There was no difference in total annual productton but summer production was greater with Pawera red clover and with Kopu or Pitau white clovers. Clovers differed little in the proportion of nitrogen fixed, except during summer when values were highest for Pawera. Pawera was less prone to nematode attack than white clover cultivars but was more susceptible to clover rot. Resident clovers and high buried seed levels (e.g., 11-91 kg/ha) made introduction of new clover cultivars difficult. Sown clovers established best (50-70% of total clover plants) when drilled into soil treated with dicamba and glyphosate. Keywords: white clover, red clover, nematodes. nitrogen fixation, pasture renovation

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