ASSIMILATION OF NITROGEN IN ROOT NODULES OF ALDER (ALNUS GLUTINOSA)

1981 ◽  
Vol 89 (2) ◽  
pp. 321-326 ◽  
Author(s):  
JAN BLOM ◽  
WIM ROELOFSEN ◽  
ANTOON D. L. AKKERMANS
Keyword(s):  
Root Nodules ◽  
Alnus Glutinosa

An overview of actinorhizal plants in Africa

2011 ◽  
Vol 38 (9) ◽  
pp. 653 ◽  
Author(s):  
Maher Gtari ◽  
Jeffrey O. Dawson
Keyword(s):  
Native Species ◽  
Root Nodules ◽  
Alnus Glutinosa ◽  
Wildlife Habitat ◽  
Actinorhizal Plants ◽  
Current Status ◽  
Arid Zones ◽  
African Countries ◽  
Climatic Regions ◽  
Actinorhizal Species

A compilation and synthesis of information derived from plant databases and other sources on the occurrence, diversity and geographic distribution of actinorhizal plants in Africa is presented in this review. Actinorhizal plants are a specific group of non-leguminous, woody dicots having symbiotic, nitrogen-fixing root nodules that are induced on roots of actinorhizal plant species by soil actinomycetes of the genus Frankia. There is a lack of basic information on actinorhizal plants in Africa compared with other major land masses in the world. Results indicate that most, if not all, African countries and climatic regions have native or introduced actinorhizal species. A synthesis of available information indicates that there are six families, nine genera and 38 reported species of actinorhizal plants in Africa. Of these, 21 species are native and 17 are exotic. The families and corresponding number of species in each genus are: Betulaceae (native Alnus glutinosa (1), exotic Alnus (2)); Casuarinaceae (exotic Casuarina (5), exotic Allocasuarina (3), exotic Gymnostoma deplancheana (1)); Coriariaceae (native Coriaria myrtifolia (1)); Myricaceae (native Morella (19), exotic Morella cerifera (1)); Rhamnaceae (exotic Ceanothus caeruleus (1), exotic Colletia paradoxa (1)); and Elaeagnaceae (exotic Eleaegnus angustifolia (1)). Four reports of native, actinorhizal Ceanothus species in Africa found in the database were determined to be false, instead, being non-actinorhizal species. Widespread plantings of exotic Casuarinaceae have been introduced into tropical and arid zones of Africa as multipurpose trees, especially in arid regions where native species do not occur. There is a diverse assemblage of native species of Morella in Africa, mostly shrubs or small trees, which provide medicine, other useful chemicals and wildlife habitat. Many native Morella species are isolated in montane islands, apparently leading to greater speciation than in Eurasia from where the genus migrated into Africa. The current status and knowledge of African actinorhizal plants indicates a need to focus research on their biogeography, biology, ecology, genetics and use.

The occurrence of amoeboid plastids in the actinorhizal root nodules of Alnus glutinosa (L.) Gaertn.

1989 ◽  
Vol 12 (2) ◽  
pp. 205-211 ◽  
Author(s):  
I. C. GARDNER ◽  
H. ABBAS ◽  
A. SCOTT
Keyword(s):  
Root Nodules ◽  
Alnus Glutinosa

Phylogenetic studies on uncultured Frankia populations in nodules of Datisca cannabina

1994 ◽  
Vol 40 (4) ◽  
pp. 313-318 ◽  
Author(s):  
M. Sajjad Mirza ◽  
Dittmar Hahn ◽  
Svetlana V. Dobritsa ◽  
Antoon D. L. Akkermans
Keyword(s):  
16S Rrna ◽  
Root Nodules ◽  
Alnus Glutinosa ◽  
Rrna Gene ◽  
16S Rrna Sequence ◽  
Phylogenetic Studies ◽  
Close Relationship ◽  
16S Rrna Sequence Analysis ◽  
Relationship Of ◽  
The 16S Rrna Gene

Part of the 16S rRNA gene was amplified directly from uncultured endophyte populations within the root nodules of Datisca cannabina and three strains isolated from nodules of Alnus glutinosa (AgKG′84/4), Coriaria nepalensis (Cn3), and D. cannabina (Dc2). Sequence comparison based on 930 nucleotides indicated that the endophyte of D. cannabina nodules belongs to the genus Frankia and is highly related to the endophyte of C. nepalensis root nodules. The relatedness of the endophytes of C. nepalensis and D. cannabina nodules was also reflected by closely related nifH sequences amplified from the nodules. 16S rRNA sequence analysis of the noninfective strains obtained from both D. cannabina (Dc2) and C. nepalensis (Cn3) nodules also revealed the close relationship of these strains to the genus Frankia.Key words: nitrogen fixation, Frankia, 16S rRNA, nifH.

Occurrence of hemoglobin in the nitrogen-fixing root nodules of Alnus glutinosa

1995 ◽  
Vol 95 (2) ◽  
pp. 247-252 ◽  
Author(s):  
Usman K. J. Suharjo ◽  
John D. Tjepkema
Keyword(s):  
Root Nodules ◽  
Alnus Glutinosa ◽  
Nitrogen Fixing

Carbon metabolism of Frankia spp. in root nodules of Alnus glutinosa and Hippophae rhamnoides

1982 ◽  
Vol 54 (4) ◽  
pp. 461-466 ◽  
Author(s):  
Kerstin Huss-Danell ◽  
Wim Roelofsen ◽  
Antoon D. L. Akkermans ◽  
Piet Meijer
Keyword(s):  
Carbon Metabolism ◽  
Root Nodules ◽  
Alnus Glutinosa ◽  
Hippophae Rhamnoides ◽  
Hippophaë Rhamnoides
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