January 2003

Actinorhizal, mycorhizal and rhizobial symbioses: how much do we know?

  In this review, we discuss the recent progress in research on symbiotic association of rhizobia, Frankia and fungi with plant roots. We compare infection processes of symbiotic establishment; structure, functioning and molecular biology of the symbiotic organ including the regulation of genes implicated in rhizobial, actinorhizial and arbuscularmycorhizal symbioses.   Key...

Author(s): Diaga Diouf,, Tahir A. Diop, and Ibrahima Ndoye,

January 2003

Effects of mixed nitrogen sources on biodegradation of phenol by immobilized Acinetobacter sp. strain W-17

  Using Ca-alginate immobilized cells of Acinetobacter sp. strain W-17, the effects of ammonium-N and nitrate-N on the biodegradation of phenol were investigated.Degradation experiments in three different culture media; minimal salts medium (MSM), simulated (SW) and modified simulated wastewater (MSW) were performed. With the freely suspended cells (cell dry weight 0.2 g/l),...

Author(s): Desouky Abd-El-Haleem, Usama Beshay, Abdou O. Abdelhamid , Hassan Moawad and Sahar Zaki

January 2003

Diversity of indigeneous bradyrhizobia associated with three cowpea cultivars (Vigna unguiculata (L.) Walp.) grown under limited and favorable water conditions in Senegal (West Africa)

  The diversity of Bradyrhizobium strains nodulating three cowpea (Vigna unguiculataL. Walp.) cultivars in favorable and water-limited conditions occuring at flowering was analysed. PCR- Restriction Fragment Length Polymorphism (PCR-RFLP) analysis of 16S-23S rDNA intergenic spacer region (IGS) directly applied on 85 crushed nodules distinguished four genetic profiles, IGS types I, II, III and IV....

Author(s): Tatiana Krasova-Wade, , , Ibrahima Ndoye, , Serge Braconnier, Benoit Sarr, Philippe de Lajudie and Marc Neyra

January 2003

Pre-harvest deterioration of Sour sop (Annona muricata) at Ibadan Southwestern Nigeria and its effect on nutrient composition

  The etiology of pre-harvest deterioration of Soursop (Annona muricata) fruit in Ibadan, southwestern Nigeria and the effects on its nutrient composition was investigated. Four fungal pathogens including Botryodiplodia theobromae, Fusariumsp., Rhizopus stolonifer and Aspergillus niger were found associated with the pre-harvest deteriorating soursop . B....

Author(s): N. A.  Amusa, O. A.  Ashaye,  M. O. Oladapo and O.O. Kafaru