Bradyrhizobium japonicum check for this species in other resources , Pseudomonas syringae check for this species in other resources , rhizosphere"/>
 
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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 10, No. 2, 2002, pp. 145-156
Bioline Code: cs02014
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 10, No. 2, 2002, pp. 145-156

 fr
Ahonsi, M.O.; Berner, D.K.; Emechebe, A.M.; Sanginga, N. & Lagoke, S.T.O.

Résumé

Trois souches de Pseudomonas syringae check for this species in other resources pathovar glycinea (Psg), connues pour leur capacité de produire l'ethylene en grande quantité, ont été etudiées en laboratiore afin d'evaluer leur efficacite de germer les grains de Striga hermonthica check for this species in other resources (Del.). Trois cent douze isolats rhizosphaeriques non-pathogene de Pseudomonas spp fluorescent et 38 isolats de Bradyrhizobium japonicum check for this species in other resources etaient egalement evalués. Les isolats de Psg etaient 67% aussi effective que GR-24 , et 31 et 38% plus effective que la gase ethylene (2.5 mg / Petri plat) et les pieces racinaire de la meilleure variete de soja (SAMSOY-2), respectivement. Aucun des isolats de pseudomonas non-pathogene et des isolats rhizobien n'a été effectif à induire la germinaison des grains de Striga hermonthica en comparaison avec les isolats de Psg. Ces resultats indiquent que les isolats bacterien produisant l'ethylene peuvent être hautement effective pour la germinaison des semences de S. hermonthica et suggèrent que de tel bacteries pourraient potentielement jouer un role important comme agents de lutte biologique contre cette plante parasitaire d'Afrique. Cependant, la production d'ethylene semble être liées génétiquement au pouvoir pathogène des isolats. Ceci suggère que la modification du gene et la technologie de transfer du gene pourraient être necessaire dans l'expoitation de telles bacteries produisant l'ethylene comme agent potentiel pour la lutte biologique contre S. hermonthica.

Mots Clés
Lutte Biologique, Bradyrhizobium japonicum check for this species in other resources , Pseudomonas syringae check for this species in other resources , rhizosphaerique

 
 en Selection Of Non-Pathogenic Ethylene-Producing Rhizobacteria For Acceleated Depletion Of Striga Hermonthica check for this species in other resources Seed Bank
Ahonsi, M.O.; Berner, D.K.; Emechebe, A.M.; Sanginga, N. & Lagoke, S.T.O.

Abstract

Three Pseudomonas syringae check for this species in other resources pathovar glycinea (Psg) strains known to produce large amounts of ethylene were tested for efficacy in germinating seeds of Striga hermonthica check for this species in other resources (Del.) Benth. in a laboratory, as were 312 rhizosphere isolates of non-pathogenic fluorescent Pseudomonas spp. and 38 Bradyrhizobium japonicum check for this species in other resources isolates. Strains of Psg were 67% as effective as GR-24, and 31 and 38% more effective than ethylene gas (2.5 mg per Petri dish) and root pieces of the best soybean cultivar (SAMSOY-2), respectively. None of the non-pathogenic pseudomonas and rhizobial isolates effectively germinated S. hermonthica seeds compared with Psg strains. Our results indicate that ethylene producing bacterial strains can be highly effective in germinating S. hermonthica seeds and suggest that such bacteria have potential as bio-control agents of this parasitic plant in Africa. However, ethylene production by bacteria may be linked with pathogenic ability. This suggests that gene modification and transfer technology may be necessary to exploit the potential usefulness of ethylene-producing bacteria for S. hermonthica control.

Keywords
Biological control, Bradyrhizobium japonicum check for this species in other resources , Pseudomonas syringae check for this species in other resources , rhizosphere

 
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