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1

Localization of nitrogenase and nitrate reductase in the Cycas-Anabaena cycadeae association

100%
Sharma A., Mishra P., Kumar A.
Acta Biologica Cracoviensia. Series Botanica
|
2004
|
tom 46
213-216
Induction of nitrate reductase (NR) activity in coralloid roots of Cycas revoluta was observed after 8 h incubation in 0.02 M KNO3. Other plants growing near Cycas showed a higher level of NR immediately when incubated in KNO3. In contrast to NR, intact coralloid roots showed very high nitrogenase activity (~1.2 to 1.6 µmol C2H4 g fresh wt-1 h-1) under both light and dark conditions as compared to transverse sections of roots. Localization of NR and nitrogenase was tested in coralloid roots using different sets of roots and also in the endophyte. Our results showed that NR activity was mainly due to the endophyte (Anabaena cycadeae); coralloid roots lacked it, as no NR activity was observed in chloramphenicol-treated intact root samples.
2

Ontogenic variation of nodulation, nitrogen fixation and nitrogen assimilation in lentil [Lens culinaris Medic]. II. Nitrogenase, nitrate reductase and glutamine synthetase activities

100%
Awan M. F. M.
Acta Physiologiae Plantarum
|
1994
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tom 16
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nr 4
3

Effect of active ingredients on Rhizobium and Bradyrhizobium legume dinitrogen fixation

100%
Sawicka A., Selwet M.
Polish Journal of Environmental Studies
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1998
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tom 07
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nr 5
In field experiment the effect of two active ingredients (imazethapyr and linuron) on symbiotic nitrogen fixation activity and microorganisms under legume crops (pea, horse bean, yellow lupine, white lupine, soybean) was determined. The studies indicated that both imazethapyr and linuron can cause decrease of root - nodule bacteria nitrogenase activity. They also can stimulate development of bacteria and inhibit growth of fungi.
4

Characterization of selected groups of microorganisms occurring in soil rhizosphere and phyllosphere of oats

80%
Rekosz-Burlaga H., Garbolinska M.
Polish Journal of Microbiology
|
2006
|
tom 55
|
nr 3
Studies were carried out on the microflora of phyllosphere and soil rhizosphere of hulled (Chwat variety) and naked (Akt variety) oats. The material taken for study embraced samples of leaves and soil rhizosphere taken from cultivations differing in extent of nitrogen fertilization. The studies involved determination of total number of aerobic heterotrophic bacteria belonging to the genus Pseudomonas and microscopic hyphal fungi. Qualitative determinations focused on bacteria belonging to the genera Azotobacter and Azospirillum were also made. Our results point to differences in number of microscopic hyphal fungi in the phyllosphere of both varieties of oats, depending on nitrogen fertilization dose. However, there were no significant differences in the number of bacteria of the different genera determined in the phyllosphere and rhizosphere. Strains of oligonitrophilic and diazotrophic bacteria were isolated from samples of the phyllosphere of oats and their N₂-fixing activity was determined by the acetylene reduction method using gas chromatography.
5

Nitrate reduction and nitrogen fixation in symbiotic association Rhizobium - legumes

80%
Lucinski L., Polcyn W., Ratajczak L.
Acta Biochimica Polonica
|
2002
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tom 49
|
nr 2
The inhibitory effect of nitrate on nitrogenase activity in root nodules of legume plants has been known for a long time. The major factor inducing changes in nitrogenase activity is the concentration of free oxygen inside nodules. Oxygen avail­ability in the infected zone of nodule is limited, among others, by the gas diffusion re­sistance in nodule cortex. The presence of nitrate may cause changes in the resistance to O2 diffusion. The aim of this paper is to review literature data concerning the effect of nitrate on the symbiotic association between rhizobia and legume plants, with special emphasis on nitrogenase activity. Recent advances indicate that symbiotic associations of Rhizobium strains characterized by a high nitrate reductase activity are less suscepti­ble to inhibition by nitrate. A thesis may be put forward that dissimilatory nitrate re­duction, catalyzed by bacteroid nitrate reductase, significantly facilitates the symbi­otic function of bacteroids.
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