Effects of Sb16 bacterial strain and herbicides on endophytic bacterial populations and growth of aerobic rice

Nahi, Armita; Othman, Radziah; Omar, Dzolkhifli

doi:10.17221/289/2016-pse

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…It has also been found that application of 2,4-D (1.42, 2.84, and 5.68 mg a.i./g soil) had a negative effect on the physio-morphological parameters of aerobic rice (Oryza sativa) and reduced the number of plant endophytes [92]; however, inoculation of seeds with the endophytic bacteria strain Stenotrophomonas maltophilia improved plant characteristics under herbicide-stressed soils. S. maltophilia has previously been described as a plant growth-promoting endophytic strain with the ability to produce auxins and siderophores [92]. Bacterial endophyte-enhanced phytoremediation was also studied by Germaine et al [78] on the example of P. sativum: plants were inoculated with genetically tagged endophytic bacteria, which naturally possess the ability to biodegrade 2,4-D.…”

Section: Endophyte-enhanced Phytoremediationmentioning

confidence: 99%

Biological Remediation of Phenoxy Herbicide-Contaminated Environments

Urbaniak¹,

Mierzejewska²

2019

Environmental Chemistry and Recent Pollution Control Approaches

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Phenoxy herbicides such as 2,4-dichlorophenoxyacetic acid (2,4-D) and 2-methyl-4-chlorophenoxyacetic acid (MCPA) are widely used in agriculture to control broadleaf weeds. Although their application has helped to increase the yield and value of crops, they are also recognized as a source of emerging environmental contamination. Their extensive use may promote contamination of soil, surface, and groundwater and lead to increased inhibition of plant development and soil toxicity. Hence, there is an urgent need to identify nature-based methods based on appropriate biological remediation techniques, such as bio-, phyto-, and rhizoremediation, that enable the effective elimination of phenoxy herbicides from the environment. Bioremediation typically harnesses microorganisms and their ability to utilize recalcitrant contaminants in complete degradation processes, while phytoremediation is a cost-effective, environmentally friendly strategy that uses plants to transform or mineralize xenobiotics to less or nontoxic compounds. Rhizoremediation (microbe-assisted phytoremediation), in turn, is based on the interactions between plant roots, root exudates enriched in plant secondary metabolites, soil, and microorganisms. Based on the above, this chapter presents current knowledge on the properties of phenoxy herbicides, as well as the concentrations detected in the environment, their toxicity, and the biological remediation techniques used for safe removal of the compounds of interest from the environment.

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Section: Endophyte-enhanced Phytoremediationmentioning

confidence: 99%

Biological Remediation of Phenoxy Herbicide-Contaminated Environments

Urbaniak¹,

Mierzejewska²

2019

Environmental Chemistry and Recent Pollution Control Approaches

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“…To d a t e , t h e r e i s i n a d e q u a t e microorganism research in aerobic rice. Prior studies on aerobic rice only emphasized on useful microorganism for enhancing plant growth and as soil enrichment (Nahi et al, 2016;Nasarudin et al, 2018). On the other hand, constant flooding and raised water inputs are needed in the usual paddy rice field.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Peat Microbial Functional Diversity in Aerobic Rice Rhizosphere

Hassan¹,

Saud²

2020

JTAS

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Microorganisms in the rhizosphere possess numerous metabolic activities. The addition of inorganic substance such as fertilizer could affect the microbial functional diversity. This study was conducted to evaluate the effect of different rate of NPK fertilizer on microbial functional diversity in the rhizosphere of local aerobic rice variety. Aerobic rice variety MRIA 1 was used in this study. Peat was taken from a non-agricultural area in Klang, Malaysia. The effect of fertilizer rate was determined with 4 different rates (C = non-fertilized; T1 = 100 kg/ha NPK; T2 = 200 kg/ha NPK; T3 = 400 kg/ha NPK). Microbial functional diversity was performed using Biolog™ Ecoplate System and measured by microbial activities, such as average well color development (AWCD), species richness (R), Shannon-Weaver index (H index) and species evenness (E). As a result, microbial activity increased to 5.7% when fertilizer applied at T2, while fertilizer rate at T3 increased species richness by 3.2%. However, addition of fertilizer did not affect the H index while species evenness slightly decreased by 1.1% when applied at T3. Bacteria population was reduced when fertilizer added at T1. Fertilizer addition to the peat soil decreased the culturable population of nitrogen-fixing microbes while no effect was found on culturable fungal, actinomycetes and phosphate-solubilizing microbe population. Microbes in T2 utilized many carbon sources. Variation in carbon sources used by microbes was found when fertilizer was applied at different rates. D-cellobiose, pyruvic acid methyl ester, and L-serine were the carbon sources that influenced the microbial function in soil. It is concluded that fertilizer has an effect on microbial functional diversity in the peat rhizosphere of local aerobic variety. The recommended fertilizer rate (T2) increased the microbial activity while high fertilizer rate (T3) increased species richness and decreased species evenness.

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