Symbiotic efficiency of autochthonous arbuscular mycorrhizal fungus (G. mosseae) and Brevibacillus sp. isolated from cadmium polluted soil under increasing cadmium levels

Vivas, A.; Vörös, I.; Bíró, Borbála; Campos, Edmundo Mario Rodríguez; Barea, J. M.; Azcón‐Aguilar, Concepción

doi:10.1016/s0269-7491(03)00195-7

Cited by 105 publications

(30 citation statements)

References 24 publications

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“…The two Bacilli genera identified in sugarcane have been identified before as endophytes: Staphylococcus was found to be associated with sweet pepper (Rasche et al, 2006) and Brevibacillus was found in cadmium-contaminated soils and associated with soybean (Sarkar et al, 2002;Vivas et al, 2003). Curtobacterium, the only representative of the Actinobacteria, was identified in orange, grape, and Pinus (Bell et al, 1995;Araújo et al, 2002;Idris et al, 2004), and interacting with the phytopathogenic bacterium Xylella fastidiosa (Lacava et al, 2004).…”

Section: Discussionmentioning

confidence: 96%

Diversity of endophytic bacteria in Brazilian sugarcane

Magnani

Didonet²,

Cruz³

et al. 2010

Genet. Mol. Res.

122

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ABSTRACT. Endophytic bacteria live inside plant tissues without causing disease. Studies of endophytes in sugarcane have focused on the isolation of diazotrophic bacteria. We examined the diversity of endophytic bacteria in the internal tissues of sugarcane stems and leaves, using molecular and biochemical methods. Potato-agar medium was used to cultivate the endophytes; 32 isolates were selected for analysis. DNA was extracted and the 16S rRNA gene was partially sequenced and used for molecular identification. Gram staining, catalase and oxidase tests, and the API-20E system were used to characterize the isolates. The strains were divided into five groups, based on the 16S rRNA sequences. Group I comprised 14 representatives of the Enterobacteriaceae; group II was composed of Bacilli; group III contained one representative, Curtobacterium sp; group IV contained representatives of the Pseudomonadaceae family, and group V had one isolate with an uncultured bacterium. Four isolates were able to reduce acetylene to ethylene. Most of the bacteria isolated from the sugarcane stem and leaf tissues belonged to Enterobacteriaceae and Pseudomonaceae, respectively, demonstrating niche specificity. Overall, we found the endophytic bacteria in sugarcane to be 251 ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 9 (1): 250-258 (2010) Microbial diversity in sugarcane more diverse than previously reported.

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Section: Discussionmentioning

confidence: 96%

Diversity of endophytic bacteria in Brazilian sugarcane

Magnani

Didonet²,

Cruz³

et al. 2010

Genet. Mol. Res.

122

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“…The symbiosis of mycorrhizal fungus and plant roots produce mycorrhiza, which can effectively decrease metal toxicity to plants. Meanwhile, the microbial strains isolated from Cd-contaminated soils are more tolerant to Cd and have developed resistance (Vivas et al 2003). On the other hand, soil disestablished due to the presence of high amounts of metals usually produce changes in the diversity and abundance of the population of mycorrhizal fungi (del Val et al 1999), which may expect to interfere with the possible beneficial effects of this symbiotic association.…”

Section: Microorganisms Induced By Root Secretion and CD Bioavailabilmentioning

confidence: 99%

Root excretion and plant tolerance to cadmium toxicity - a review

Dong¹,

Mao²,

Zhang³

et al. 2007

PLANT SOIL ENVIRON

197

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Significant quantities of Cd have been added to soils globally due to various anthropogenic activities, posing a serious threat to safe food production and human health. Rhizosphere, as an important interface of soil and plant, plays a significant role in the agro-environmental system. This article presents a review of relationship between root excretion and microorganisms and plant resistance to Cd toxicity and possible mechanisms. Root exudates markedly altered in species and quantity under Cd stress. Root exudates can affect Cd absorption by plants through changing the physical and chemical characteristics of rhizospheres. The influence of root exudates on Cd bioavailability and toxicity may include modifying the rhizosphere pH and Eh, chelating/complexing and depositing with Cd ions, and altering the community construction, the numbers and activities of rhizospheric microbes. In this paper, the methods to reduce the transfer of Cd in soil-plant system by adjusting rhizosphere environment are discussed, and some aspects are also proposed that should be emphasized in the future research work.

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“…Apart from mycorrhizas and from the mycorrhizospheres, these bacteria have been isolated from ECMF fruiting bodies, AMF spores, galls, termite mounds, and heavy metal-contaminated soils (Garbaye and Bowen 1989;Founoune et al 2002;Xavier and Germida 2003;Gamalero et al 2003;Vivas et al 2003d). Because endocellular bacteria have been reported for a long time in different AM fungi (Bianciotto et al 1996;Bianciotto and Bonfante 2002) and more recently also in the ectomycorrhizal basidiomycete Laccaria bicolor and the ascomycete Tuber borchii (Barbieri et al 2000;Bertaux et al 2003), one should wonder if these bacteria can harbor mycorrhiza helper activity.…”

Section: Helper Strains: Origin and Taxonomymentioning

confidence: 99%

“…Lateral root production can be positively influenced by MHB (Garbaye 1994;Poole et al 2001;Vivas et al 2003d;Schrey et al 2005), probably due to the production of auxins or auxin-related substances by the bacteria. The formation of novel root tips may lead to the establishment of more mycorrhizas, as the density of colonization sites per soil volume increases.…”

Section: Host Recognition and Changes In Root System Architecturementioning

confidence: 99%