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Role of Sinorhizobium meliloti glutaredoxins in nitrogen-fixing symbiosis

100%
Benyamina S., Alloing G., Rouhier N., Jacquot J., Puppo A., Frendo P.
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
|
2013
|
tom 94
|
nr 2
2

Anaerobic processes in yellow lupin (Lupinus luteus L.) root nodules

84%
Mazurowa H., Ratajczak L.
Acta Biochimica Polonica
|
1989
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tom 36
|
nr 3-4
3

Ultra-structural studies on root nodules of Samanea saman [Jacq.] Merr. [Leguminosae]

84%
Quadri R., Mahmood A., Athar M.
Polish Journal of Microbiology
|
2007
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tom 56
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nr 3
Ultra-structural studies were conducted on root nodules of Samanea saman (Jacq.) Merr. collected from trees growing under natural conditions. Nodules were distributed singly as well as in clusters on the main and lateral roots. Mature nodules were elongated, branched and coralloid. Root hair curling was found but infection threads could not be observed. Rhizobia entered through the epidermis and moved intercellularly through the cortical region. Mature nodules of S. saman could be differentiated into meristem, cortex, vascular tissue and bacteroid tissue. The latter showed both infected and non-infected cells mixed together. Vascular bundles were inversely collateral and distributed around the bacteroid tissue. The bacteroids were enclosed in peribacteroid membrane in groups and showed prominent granules of polyhydroxybutyrate in their cytoplasm. Mycorrhizal hyphae were also observed along with rhizobia in the bacteroid tissue. S. saman with dual rhizobial and mycorrhizal infection is a potential tree for plantation in arid soils of Pakistan.
4

Changes in the activity and isozyme patterns of malate dehydrogenase in root nodules of yellow lupine

84%
Garnczarska M., Ratajczak L.
Acta Physiologiae Plantarum
|
1999
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tom 21
|
nr 2
The malate dehydrogenase present in the cytoplasmic fraction of plant origin and bacteroids from yellow lupine root nodules was investigated. The plant enzyme was 14 times more active in nodules than in roots and it contained 6 molecular forms in nodules compared with 3 forms detected in roots. The highest malate dehydrogenase activity in plant fraction and bacteroids was noted in 50-day old plants. Changes in the isoenzymatic patterns of malate dehydrogenase in plant fraction and bacteroids accompanying ageing of the lupine root nodules were observed. Possible physiological role of malate pathway in metabolism of lupine root nodules is discussed.
5

Respiratory activity of bacteroids and mitochondria in root nodules of yellow lupine

84%
Ratajczak L., Ratajczak W., Mazurowa H., Wozny A.
Biological Bulletin of Poznań
|
1996
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tom 33
6

A comparative developmental pattern of enzymes of carbon metabolism and pentose phosphate pathway in mungbean and lentil nodules

67%
Chopra J., Kaur N., Gupta A. K.
Acta Physiologiae Plantarum
|
2002
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tom 24
|
nr 1
7

Nitrate reduction and nitrogen fixation in symbiotic association Rhizobium - legumes

67%
Lucinski L., Polcyn W., Ratajczak L.
Acta Biochimica Polonica
|
2002
|
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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