Phenotypic and genotypic characteristics of Acacia senegal (L.) Willd. root-nodulating bacteria isolated from soils in the dryland part of Senegal

被引：31

作者：

Fall, D. ^{[1
,2
]}

Diouf, D. ^{[1
,2
]}

Ourarhi, M.

Faye, A. ^{[2
]}

Abdelmounen, H.

Neyra, M. ^{[3
]}

Sylla, S. N. ^{[1
,2
]}

El Idrissi, M. Missbah

机构：

[1] Univ Cheikh Anta Diop, Dept Biol Veg, Dakar, Senegal

[2] UCAD, IRD, ISRA, Lab Commun Microbiol, Dakar, Senegal

[3] USC INRA 1242, IRD UMR 113, IRD CIRAD AGRO M UM2, Lab Symbioses Trop & Mediterraneennes, Montpellier, France

来源：

LETTERS IN APPLIED MICROBIOLOGY | 2008年 / 47卷 / 02期

关键词：

acacia senegal; diversity; ecology; genotyping; molecular genetic; stress response symbiosis;

D O I：

10.1111/j.1472-765X.2008.02389.x

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

Aims: We characterized phenotypically and genotypically root-nodulating bacteria associated with Acacia senegal (L.) Willd. isolated from the soils surrounding A. senegal trees in the dry land area of Senegal. Methods and Results: The phenotypical and genotypical characterizations we carried out showed a high diversity of A. senegal root-nodulating bacteria. Phenotypic patterns showed adaptations of the rhizobial strains to many environmental stresses such as heat, drought, and salinity. Twelve molecular groups were distinguished by profiles obtained using polymerase chain reaction/restriction fragment length polymorphism techniques from intergenic spacer region rDNA. The highest genetic diversity was found around the A. senegal rhizosphere. Therefore, A. senegal seemed to have a positive influence on occurrence and genotypical diversity of rhizobial populations. Rhizobial isolates obtained in this study belonged phylogenetically to the genera Mesorhizobium and Rhizobium. Conclusions: Our results provided information about the genetic diversity of the rhizobial strains associated with A. senegal and suggested the adaptability of natural rhizobial populations to major ecological environmental stress within these soil environments. Significance and Impact of the Study: These results suggested a potential selection of compatible and well adapted strains under stress conditions as inoculants for successful A. senegal growth in arid lands.

引用

页码：85 / 97

页数：13

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