Manipulation of rhizobia microflora for improving legume productivity and soil fertility: A critical assessment

Brockwell, J; Bottomley, Peter J.; Thies, Janice E.

doi:10.1007/978-94-011-0055-7_7

Cited by 8 publications

(2 citation statements)

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“…Legumes are important crops in agriculture, not only because they are a protein-rich food source, but also because of their contribution to soil fertilization through symbiotic nitrogen fixation (SNF) as a result of their association with nitrogenfixing PGPR, i.e., rhizobia (Zahran, 1999). Each year, legumes can provide more than 70 million tonnes of N to soil (Brockwell et al, 1995). The symbiosis between legume and rhizobium is responsible for a substantial part of global N flux in which atmospheric N 2 is fixed to form ammonia, nitrate, and organic nitrogen.…”

Section: Introductionmentioning

confidence: 99%

The Impacts of Domestication and Agricultural Practices on Legume Nutrient Acquisition Through Symbiosis With Rhizobia and Arbuscular Mycorrhizal Fungi

Liu

Contador

et al. 2020

Front. Genet.

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Legumes are unique among plants as they can obtain nitrogen through symbiosis with nitrogen-fixing rhizobia that form root nodules in the host plants. Therefore they are valuable crops for sustainable agriculture. Increasing nitrogen fixation efficiency is not only important for achieving better plant growth and yield, but it is also crucial for reducing the use of nitrogen fertilizer. Arbuscular mycorrhizal fungi (AMF) are another group of important beneficial microorganisms that form symbiotic relationships with legumes. AMF can promote host plant growth by providing mineral nutrients and improving the soil ecosystem. The trilateral legume-rhizobia-AMF symbiotic relationships also enhance plant development and tolerance against biotic and abiotic stresses. It is known that domestication and agricultural activities have led to the reduced genetic diversity of cultivated germplasms and higher sensitivity to nutrient deficiencies in crop plants, but how domestication has impacted the capability of legumes to establish beneficial associations with rhizospheric microbes (including rhizobia and fungi) is not well-studied. In this review, we will discuss the impacts of domestication and agricultural practices on the interactions between legumes and soil microbes, focusing on the effects on AMF and rhizobial symbioses and hence nutrient acquisition by host legumes. In addition, we will summarize the genes involved in legume-microbe interactions and studies that have contributed to a better understanding of legume symbiotic associations using metabolic modeling.

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Section: Introductionmentioning

confidence: 99%

The Impacts of Domestication and Agricultural Practices on Legume Nutrient Acquisition Through Symbiosis With Rhizobia and Arbuscular Mycorrhizal Fungi

Liu

Contador

et al. 2020

Front. Genet.

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“…Hence, it reduces the amount of inorganic nitrogen fertilizer required in smallholder farming systems where the use of inorganic fertilizers is limited. However, N uptake by soybean plant through N 2 fixation is often limited by many factors including environmental conditions, absence of adequate population of compatible, efficient and competitive indigenous rhizobia (Thies et al, 1991;Brockwell et al, 1995;Giller, 2001). It is difficult for smallholder farmers to apply the required external inputs such as N and P fertilizers since they are expensive and unaffordable (Kyei-Boahen et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Symbiotic effectiveness of Bradyrhizobium strains on soybean growth and productivity in Northern Mozambique

Kyei-Boahen

Savala

Muananamuale

et al. 2023

Front. Sustain. Food Syst.

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Inoculation of soybean [Glycine max (L.) Merr.] with rhizobia strains is a low-cost investment which can increase yields of smallholder farmers in Mozambique. The performance of four Bradyrhizobium strains was evaluated to identify the best strain to inoculate soybean grown in different agro-ecologies. Field experiments were conducted in three ecological zones in 2018 and 2019 using soybean variety Zamboane inoculated with Bradyrhizobium diazoefficiens strain USDA 110, B. japonicum strains USDA 136, USDA 442 and WB74, and a non-inoculated control in a randomized complete block design with four replications. Indigenous rhizobia populations at the sites ranged from 9.0 x 101 to 2.2 x 103 cells g−1 soil. All four strains increased nodulation, but USDA 110 was superior at two sites with low native rhizobia population, whereas USDA 442 and WB74 were the best at the site with relatively high native rhizobia population. On an average, the strains doubled the number of nodules and increased the dry weight up to 5.8-fold. Inoculation increased shoot dry weight and N content at podding, plant biomass, and number of pods plant−1 across sites but the effects of the strains on seeds per pod, and 100-seed weight were inconsistent. Shoot N content did not differ among inoculant strains and ranged from 15.70 g kg−1 in the control to 38.53 g kg−1 across inoculation. All four strains increased soybean grain yield across sites in 2018 but USDA 110 outperformed the other strains and was also the best at one of the two sites in 2019. Grain yield responses associated with USDA 110 ranged from 552 kg ha−1 (56%) to 1,255 kg ha−1 (76%). Positive correlations between nodule dry weight plant−1 and seed yield, and number of pods plant−1 and grain yield were observed. The gross margin ranged from $343.50–$606.80 ha−1 for the control, but it increased to $688.34–$789.36 when inoculants were applied. On an average, inoculation increased gross margin by $182.57-$395.35 ha−1 over that of non-inoculated control in 2018 but drought stress in 2019 reduced the benefit. The results demonstrate that USDA 110 was the best inoculant strain and has the potential of increasing smallholder productivity and net returns.

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Biological Nitrogen Fixation for Sustainable Agriculture

Saha

Das

et al. 2017

Agriculturally Important Microbes for Sustainable Agriculture

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Manipulation of rhizobia microflora for improving legume productivity and soil fertility: A critical assessment

Cited by 8 publications

References 323 publications

The Impacts of Domestication and Agricultural Practices on Legume Nutrient Acquisition Through Symbiosis With Rhizobia and Arbuscular Mycorrhizal Fungi

The Impacts of Domestication and Agricultural Practices on Legume Nutrient Acquisition Through Symbiosis With Rhizobia and Arbuscular Mycorrhizal Fungi

Symbiotic effectiveness of Bradyrhizobium strains on soybean growth and productivity in Northern Mozambique

Biological Nitrogen Fixation for Sustainable Agriculture

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