Abundance of native rhizobia nodulating cowpea in major production areas of Ethiopia as influenced by cropping history and soil properties

Kebede, Erana; Amsalu, Berhanu; Argaw, Anteneh; Tamiru, Solomon

doi:10.1080/27658511.2021.1889084

Cited by 4 publications

(1 citation statement)

References 38 publications

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“…The N de ciency could be attributed to low SOM which might have result from low input of plant residues in to the soil. This nding is in agreement with the work ofKebede et al (2021) who observed a strong correlation between SOM and soil N content. Following contamination and subsequent plant growth, N and P contents in the rhizosphere soil increased beyond its critical limits especially during the 12 week period Okalebo et al (2002).…”

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confidence: 93%

Cowpea induced physicochemical and biological rhizosphere changes in hydrocarbon contaminated soil

et al. 2022

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To understand the in uence of cowpea on its rhizosphere physicochemical and biological conditions. MethodsPristine soil samples were contaminated with Bonny-Light crude oil and viable seeds of cowpea were planted to establish rhizosphere soil. Cowpea root exudates were collected and characterized while soil metabolic activities, physicochemical properties and rhizosphere effect were monitored following plant emergence. ResultsCowpea root exudates were composed of organic acids, phenolics, carbohydrates and hydrocarbons. High rate of soil respiration and microbial biomass carbon were observed in the contaminated rhizosphere reaching its peak on 12th week (70.56 mgCO 2 g −1 day −1 ) and 10th week (23.18mg/Kg) respectively. Lower rates of soil respirations and microbial biomass carbon were observed in contaminated (10.28 mgCO 2 g −1 day −1 ; 1.24 mg/Kg) and uncontaminated (0.23 mgCO 2 g −1 day −1 ; 0.37 mg/Kg) non-rhizosphere control soils respectively. The metabolic properties were positively correlated with soil organic matter contents and microbial size (r = 0.98; p < 0.05). There was considerable improvement in soil physicochemical properties in the cowpea rhizosphere as compared to non-rhizosphere soil Microbial populations were generally improved with positive rhizosphere effect values (>1) presumably due to the presence of compounds in exudates that promote microbial growth. ConclusionThe results highlighted the in uence of cowpea on its rhizosphere conditions which is a good indication for its ability to promote plant growth and environmental cleanup. Therefore, there is the need to further understand the microbial community dynamics in cowpea rhizosphere using culture-independent techniques.

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confidence: 93%

Cowpea induced physicochemical and biological rhizosphere changes in hydrocarbon contaminated soil

et al. 2022

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Challenges to rhizobial adaptability in a changing climate: Genetic engineering solutions for stress tolerance

Zhang,

Ku,

Cheung

et al. 2024

Microbiological Research

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Characterization of Rhizobia Isolated from Tigray Soil and Assessment of Their Effect on Germination and Seedling Vigor of Wheat and Field Pea

Mesele,

Yaekob,

Kasegn

et al. 2024

International Journal of Agronomy

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Nowadays, the inoculation of plant growth-promoting rhizobia in leguminous and nonleguminous crops is given great emphasis as it improves germination and seedling vigor, resulting in increased yields. In this study, 32 rhizobia isolates were obtained from five different sampling sites in Tigray, Ethiopia. Based on morphological, biochemical, and confirmatory tests, including sugar fermentation, the isolates were identified as belonging to the rhizobia genera. In vitro assessment of plant growth-promoting properties revealed that all isolates produced indole-acetic-acid, ammonia, and solubilized phosphate, except TA8, which did not solubilize phosphate. Only 3 isolates (TA1, TA2, and TA8) produced hydrogen cyanide, so they can be used as biocontrol agents. Nineteen isolates showed a growth reduction activity against Fusarium oxysporum, with a percent inhibition range of 34.2%–65.8%. All isolates tolerated a pH range of 4.0–9.0. The isolates showed growth variations in various temperatures and salt concentrations. A few isolates were tolerant up to 45°C temperature and 6% (w/v) CaCl2 and NaCl concentrations. Inoculation of the isolates to wheat seeds increased seed germination, seedling shoot/root length, and seedling vigor index compared to the positive and negative controls. Isolates KO3, KO4, ME3, and TA5 increased seed germination by 4%. KO1 (11.60 cm) and TA7 (11.70 cm) showed a significantly enhanced shoot length, and ME3 showed a maximum root length (13.90 cm). SH1, KO2, and the positive control showed a significant (P≤0.05) increase in pea seed germination (by 20%) compared to the negative control. The positive control had the longest field pea shoot (5.70 cm), and isolate TA9 had the longest field pea root (5.32 cm) compared to the negative control. Generally, the wheat and field pea seedlings responded differently to the inoculation of different isolates. This study shows that Tigray soils harbor a variety of rhizobia species, which can be used as plant growth-promoting and biocontrol agents.

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Abundance of native rhizobia nodulating cowpea in major production areas of Ethiopia as influenced by cropping history and soil properties

Cited by 4 publications

References 38 publications

Cowpea induced physicochemical and biological rhizosphere changes in hydrocarbon contaminated soil

Cowpea induced physicochemical and biological rhizosphere changes in hydrocarbon contaminated soil

Challenges to rhizobial adaptability in a changing climate: Genetic engineering solutions for stress tolerance

Characterization of Rhizobia Isolated from Tigray Soil and Assessment of Their Effect on Germination and Seedling Vigor of Wheat and Field Pea

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