Phenotypic and Genotypic Diversity of Rhizobia Nodulating Pterocarpus erinaceus and P. lucens in Senegal

Sylla, Samba Ndao; Samba, Ramatoulaye; Neyra, Marc; Ndoye, Ibrahima; Giraud, Éric; Willems, Anne; Lajudie, Philippe de; Dreyfus, B

doi:10.1078/07232020260517715

Cited by 35 publications

(20 citation statements)

References 34 publications

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“…Results of Shannon diversity index (H') showed that the genetic diversity of rhizobial strains was higher in Goudiry semiarid region than in Dahra arid region. However, Diouf et al (2007) and Sylla et al (2002) did not find any clear relationship between rhizobial strain diversity and ecogeographical origin.…”

Section: Distribution Of Rhizobial Strains In the Two Regionsmentioning

confidence: 89%

Distribution and Diversity of Rhizobial Populations Associated with <i>Acacia senegal</i> (L.) Willd. Provenances in Senegalese Arid and Semiarid Regions

Bakhoum¹,

Roux²,

Diouf³

et al. 2014

OJF

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Distribution and diversity of rhizobial strains associated with Acacia senegal (L.) Willd. in relation to seed provenances in soils from arid (Dahra) and semiarid (Goudiry) zones of Senegal were investigated. PCR-RFLP performed on 16S-23S rDNA intergenic spacer (IGS) of nodule crude extracts revealed a high genetic diversity of rhizobial strains, which was higher in the semiarid region than in the arid region. The distribution of rhizobial populations was influenced by soil physical and chemical characteristics, and by A. senegal provenances as shown by the analysis of correspondence. In contrast, the phenotypic diversity of rhizobial strains was not correlated with the soil origin. The phylogenetic tree (performed by the maximum likelihood algorithm) of IGS 16S-23S sequences showed that most of the rhizobial strains nodulating A. senegal were closely related to Mesorhizobium plurifarium. Our results showed that rhizobial taxa associated with A. senegal were mainly distributed according to soil physical and chemical characteristics, and A. senegal provenances. A large subset of A. senegal root-nodulating bacteria had high diversity that correlated with the most favourable environmental conditions. Understanding the diversity and distribution of rhizobial strains may be exploited in the formulation of A. senegal inoculants for different seed provenances for resilience to soil stresses in various environmental conditions.

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Section: Distribution Of Rhizobial Strains In the Two Regionsmentioning

confidence: 89%

Distribution and Diversity of Rhizobial Populations Associated with <i>Acacia senegal</i> (L.) Willd. Provenances in Senegalese Arid and Semiarid Regions

Bakhoum¹,

Roux²,

Diouf³

et al. 2014

OJF

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“…Although bradyrhizobia have largely been described as slowgrowing bacteria in culture (26,28,31,36,49,50), we distinguished two growing types in our study: almost all Bradyrhizobium isolates close to B. japonicum that were from the Acacia hybrid had fast growth, in comparison to those close to B. elkanii that were isolated from both parental Acacia species and were slow growing. Both growth types of bradyrhizobia also had distinct morphological aspects, with the former producing compact, convex, and firm colonies while the later formed very spread out, flat, and soft colonies.…”

Section: Discussionmentioning

confidence: 86%

Bradyrhizobia Nodulating the Acacia mangium × A. auriculiformis Interspecific Hybrid Are Specific and Differ from Those Associated with Both Parental Species

Roux

Tentchev

Prin

et al. 2009

Appl Environ Microbiol

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In the context of an increasing utilization of the interspecific hybrid Acacia mangium ؋ A. auriculiformis as a plantation tree in the tropical humid zone, its symbiotic characterization was carried out in comparison with that of its two parental species. Rhizobium strains of diverse geographical origins were isolated from root nodules of the hybrid and its parents. Almost all Acacia hybrid isolates were fast growing on yeast extractmannitol medium, in contrast to those isolated from both parental species, which were mostly slow growing. The rhizobium strains were characterized through partial sequencing of the rRNA operon. In the phylogenetic tree, almost all strains isolated from the hybrid were grouped together in a clade close to Bradyrhizobium japonicum, while all strains isolated from both parental species were close to Bradyrhizobium elkanii. Inoculation experiments performed under in vitro or greenhouse conditions showed that all strains were infective with their original hosts but exhibited very variable degrees of effectivity according to the host plant tested. Thus, homologous strain-host associations were more effective than heterologous ones. This shows that there is still a high potential for isolating and testing new strains from hybrids to be used as inoculants in the context of large-scale afforestation programs.

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“…L'absence d'individus jeunes, particulièrement dans les aires protégées tel le Parc W où la pression anthropique est absente, pourrait être liée aux facteurs climatiques. Sylla et al (2002) suggèrent que, malgré le statut protégé de l'espèce dans les forêts classées et parcs nationaux du Sénégal, des peuplements ont disparu sous l'effet de la sécheresse. Plusieurs auteurs ont mis en évidence la bonne capacité de germination des graines de P. erinaceus et l'incapacité des plantules à franchir les différents stades de développement jusqu'à l'âge adulte à cause des agents perturbateurs tels que les facteurs climatiques, l'herbivorie, les feux de végé-tation et le défrichement (Bationo et al, 2001 ;Ouédraogo et al, 2006 ;Nacoulma, 2012).…”

Section: éVolution Des Structures En Diamètre Et En Hauteurunclassified

Structure Des Peuplements Naturels De Pterocarpus Erina- Ceus Poir. Dans Le Domaine Souda- Nien, Au Niger Et Au Burkina Faso

Rabiou¹,

Diouf²,

Bationo³

et al. 2015

Bois for. trop.

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Structure des peuplements naturels de Pterocarpus erinaceus Poir.dans le domaine soudanien, au Niger et au Burkina Faso erinaceus augmente de manière significative (P < 0,003) de la zone sahélo-soudanienne à la zone soudano-guinéenne : 1,2 ± 0,7 pied/ha dans la zone sahélo-soudanienne ; 2,6 ± 2,2 pieds/ha dans la zone nord-soudanienne ; 6,1 ± 4,6 pieds/ha dans la zone sud-soudanienne ; 15,0 ± 1,1 pieds/ha dans la zone soudano-guinéenne. L'analyse des structures en diamètre et en hauteur révèle une augmentation de la fréquence des individus jeunes suivant le gradient pluviomé-trique. Par contre, l'intensité de l'exploitation est plus élevée dans les zones les moins arrosées, où l'espèce s'avère menacée.B o i s e t f o r ê t s d e s t r o p i q u e s , 2 0 1 5 , n° 3 2 5 ( 3 ) PTEROCARPUS ERINACEUS 71 B o i s e t f o r ê t s d e s t r o p i q u e s , 2 0 1 5 , n° 3 2 5 ( 3 )

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Phenotypic and Genotypic Diversity of Rhizobia Nodulating Pterocarpus erinaceus and P. lucens in Senegal

Cited by 35 publications

References 34 publications

Distribution and Diversity of Rhizobial Populations Associated with <i>Acacia senegal</i> (L.) Willd. Provenances in Senegalese Arid and Semiarid Regions

Distribution and Diversity of Rhizobial Populations Associated with <i>Acacia senegal</i> (L.) Willd. Provenances in Senegalese Arid and Semiarid Regions

Bradyrhizobia Nodulating the Acacia mangium × A. auriculiformis Interspecific Hybrid Are Specific and Differ from Those Associated with Both Parental Species

Structure Des Peuplements Naturels De Pterocarpus Erina- Ceus Poir. Dans Le Domaine Souda- Nien, Au Niger Et Au Burkina Faso

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Phenotypic and Genotypic Diversity of Rhizobia Nodulating Pterocarpus erinaceus and P. lucens in Senegal

Cited by 35 publications

References 34 publications

Distribution and Diversity of Rhizobial Populations Associated with &lt;i&gt;Acacia senegal&lt;/i&gt; (L.) Willd. Provenances in Senegalese Arid and Semiarid Regions

Distribution and Diversity of Rhizobial Populations Associated with &lt;i&gt;Acacia senegal&lt;/i&gt; (L.) Willd. Provenances in Senegalese Arid and Semiarid Regions

Bradyrhizobia Nodulating the Acacia mangium × A. auriculiformis Interspecific Hybrid Are Specific and Differ from Those Associated with Both Parental Species

Structure Des Peuplements Naturels De Pterocarpus Erina- Ceus Poir. Dans Le Domaine Souda- Nien, Au Niger Et Au Burkina Faso

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Distribution and Diversity of Rhizobial Populations Associated with <i>Acacia senegal</i> (L.) Willd. Provenances in Senegalese Arid and Semiarid Regions

Distribution and Diversity of Rhizobial Populations Associated with <i>Acacia senegal</i> (L.) Willd. Provenances in Senegalese Arid and Semiarid Regions