Survival of endophytic diazotrophic bacteria in soil under different moisture levels

Oliveira, André L.M.; Canuto, Erineudo Lima; Silva, Edmilson E.; Reis, Verônica Massena; Baldani, José Ivo

doi:10.1590/s1517-83822004000300005

Cited by 29 publications

(11 citation statements)

References 21 publications

(21 reference statements)

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“…Thermal treatment of sugarcane setts (30 minutes at 52 • C), applied to eliminate phytopathogenic bacteria responsible for the ratoon stanting disease, did not eliminate the endophyte , confirming that the setts are one way of dissemination of the bacteria. In addition, it has been observed that the bacteria have a very low rate of survival in soil (Baldani et al 1997a), although it has been demonstrated that the rate of cell death depends on the humidity at the time of inoculation into the soil (Oliveira et al 2004). It is already known that the bacterial population is also influenced by the nutritional stage of the sugarcane plants (Reis-Jr et al 2000) and that nitrogen fertilization also decreases the population of G. diazotrophicus associated with the sugarcane (Fuentes-Ramírez et al 1999).…”

Section: Plant Dependencementioning

confidence: 99%

History on the biological nitrogen fixation research in graminaceous plants: special emphasis on the Brazilian experience

Baldani

2005

An. Acad. Bras. Ciênc.

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233

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This review covers the history on Biological Nitrogen Fixation (BNF) in Graminaceous plants grown in Brazil, and describes research progress made over the last 40 years, most of which was coordinated by Johanna Döbereiner. One notable accomplishment during this period was the discovery of several nitrogen-fixing bacteria such as the rhizospheric (Beijerinckia fluminensis and Azotobacter paspali), associative (Azospirillum lipoferum, A. brasilense, A. amazonense) and the endophytic (Herbaspirillum seropedicae, H. rubrisubalbicans, Gluconacetobacter diazotrophicus, Burkholderia brasilensis and B. tropica). The role of these diazotrophs in association with grasses, mainly with cereal plants, has been studied and a lot of progress has been achieved in the ecological, physiological, biochemical, and genetic aspects. The mechanisms of colonization and infection of the plant tissues are better understood, and the BNF contribution to the soil/plant system has been determined. Inoculation studies with diazotrophs showed that endophytic bacteria have a much higher BNF contribution potential than associative diazotrophs. In addition, it was found that the plant genotype influences the plant/bacteria association. Recent data suggest that more studies should be conducted on the endophytic association to strengthen the BNF potential. The ongoing genome sequencing programs: RIOGENE (Gluconacetobacter diazotrophicus) and GENOPAR (Herbaspirillum seropedicae) reflect the commitment to the BNF study in Brazil and should allow the country to continue in the forefront of research related to the BNF process in Graminaceous plants.

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Section: Plant Dependencementioning

confidence: 99%

History on the biological nitrogen fixation research in graminaceous plants: special emphasis on the Brazilian experience

Baldani

2005

An. Acad. Bras. Ciênc.

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233

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“…Decreased soil moisture or increased soil pH loosens bacterial attachment to the soil particles surfaces. Under adequate soil moisture and in the absence of the host plant, different PGPR species are adsorbed loosely on the surfaces of soil particles and hence can move to the roots of other plants (Oliveira et al 2004). …”

Section: Introductionmentioning

confidence: 99%

Wheat (Triticum aestivum L.) growth enhancement by Azospirillum sp. under drought stress

Arzanesh¹,

Alikhani

Khavazi³

et al. 2010

World J Microbiol Biotechnol

261

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Plant growth promoting rhizobacteria (PGPR) can enhance plant growth by alleviating soil stresses. Although previously investigated, some new interesting details are presented regarding the alleviating affects of Azospirillum sp. on wheat growth under drought stress in this research work. We hypothesized that the isolated strains of Azospirillum sp. may alleviate the adverse effects of drought stress on wheat (Triticum aestivum L.) growth. Three different strains of Azospirillum lipoferum (B1, B2 and B3) were used to inoculate wheat seedlings under drought. During the flowering stage the seedlings were subjected to three drought levels with five different time longevity, including control. Pots were water stressed at 80% (S0), 50% (S1) and 25% (S2) of field capacity moisture in a 25 day-period. Soil and plant water properties including water potential and water content, along with their effects on bacterial inoculum and wheat growth, were completely monitored during the experiment. While stress intensity significantly affected bacterial population and wheat growth, stress longevity only affected wheat water potential and water content. Compared to uninoculated treatments strain B3 (fixing and producing the highest amounts of N and auxin, respectively, with P solubilizing and ACC-deaminase activities) increased wheat yield at S1 and S2 by 43 and 109%, respectively. However, strain B2 (producing siderophore) was the most resistant strain under drought stress. The results of this experiment may elucidate the more efficient strains of Azospirillum sp. for wheat inoculation under drought stress and the mechanisms by which they alleviate the stress.

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“…The amount of moisture present in soil at a particular time mostly depends on soil type. Plant wilting can be caused either by the plant or by the soil [18, 20] Soils having more water-holding capacity are more favorable for bacterial development and increase in soil moisture extended the survival of the endophytic bacteria [18]. Consistent with this notion, less disease severity was recorded for sandy loam soil as water holding capacity of sandy loam soil is less that silt loam and loam soil.…”

Section: Discussionmentioning

confidence: 97%

Effect of irrigation intervals and soil types on yield and yield components of tomato plants artificially inoculated with Clavibacter Michiganensis subsp. Michiganensis

Bibi¹,

Ahmad²

2016

PAB

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To determine the effect of irrigation interval and soil type on the severity of bacterial canker of tomato, a field experiment was carried out at Agricultural Research Institute (ARI) Tarnab in March to June 2013 and 2014. Five treatments: T1 = irrigation with 8 days interval, T2 = irrigation with 9 days interval, T3 = irrigation with 10 days interval, T4 = irrigation with 11 days interval and T5 = irrigation with 12 days interval were investigated for their effect on bacterial canker of tomato. In the same experiment, another factor i.e. soil types (S1 = Sandy Loam, S2 = Loam and S3 = Silt loam) were also investigated. Trials were replicated four times in a completely randomized design with split plot arrangement. Data were recorded for; survival percentage, number of flowers plant -1 , number of fruits plant -1 , fruiting percentage, disease severity and yield plant -1 . Results revealed that keeping irrigation interval at 12 days, the disease rating score reduced to its minimum (0.83), however the yield (1.88 kg.plant -1 ) was affected due to drought. For soil types less (1.67 and 1.77) disease severity was scored for sandy loam and silt loam soil respectively, whereas for the loam soil higher (2.10) disease ratings were observed. Highest (2.29kg) yield per plant was recorded for silt loam, followed by loam soil with 2.17kg.plant -1 . While 10 days irrigation interval was found to be the best with 2.48kg yield per plant. It was therefore, concluded, that ten days interval in irrigation was found to be optimum for obtaining the maximum yield, while silt loam soil is best due to its optimum water-holding capacities for tomato crop to tolerate the bacterial canker disease.

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Survival of endophytic diazotrophic bacteria in soil under different moisture levels

Cited by 29 publications

References 21 publications

History on the biological nitrogen fixation research in graminaceous plants: special emphasis on the Brazilian experience

History on the biological nitrogen fixation research in graminaceous plants: special emphasis on the Brazilian experience

Wheat (Triticum aestivum L.) growth enhancement by Azospirillum sp. under drought stress

Effect of irrigation intervals and soil types on yield and yield components of tomato plants artificially inoculated with Clavibacter Michiganensis subsp. Michiganensis

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