Background
Inoculation of plants to enhance yield of crops and performance of other plants is a century old, proven technology for rhizobia and a newer venue for plant growth-promoting bacteria and other plant symbionts. The two main aspects dominating the success of inoculation are the effectiveness of the bacterial isolate and the proper application technology.

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Advances in plant growth-promoting bacterial inoculant technology: formulations and practical perspectives (1998–2013)

Plant growth promotion in cereal and leguminous agricultural important plants: from microorganism capacities to crop production.

Inoculation of zinc solubilizing Bacillus aryabhattai strains for improved growth, mobilization and biofortification of zinc in soybean and wheat cultivated in Vertisols of central India

Use of commercial bio-inoculants to increase agricultural production through improved phosphrous acquisition

Arbuscular mycorrhizal (AM) symbioses are widespread in land plants but the extent to which they are functionally important in agriculture remains unclear, despite much previous research. We ask focused questions designed to give new perspectives on AM function, some based on recent research that is overturning past beliefs. We address factors that determine growth responses (from positive to negative) in AM plants, the extent to which AM plants that lack positive responses benefit in terms of nutrient (particularly phosphate: P) uptake, whether or not AM and nonmycorrhizal (NM) plants acquire different forms of soil P, and the cause(s) of AM ‘growth depressions’. We consider the relevance of laboratory work to the agricultural context, including effects of high (available) soil P on AM fungal colonisation and whether AM colonisation may be deleterious to crop production due to fungal ‘parasitism’. We emphasise the imperative for research that is aimed at increasing benefits of AM symbioses in the field at a time of increasing prices of P-fertiliser, and increasing demands on agriculture to feed the world. In other words, AM symbioses have key roles in providing ecosystem services that are receiving increasing attention worldwide.

What is the significance of the arbuscular mycorrhizal colonisation of many economically important crop plants

The scarcity of non-renewable resources such as soils and fertilizers and the consequences of climate change can dramatically influence the food security of future generations. Mutualistic root microorganisms such as plant growth-promoting rhizobacteria (PGPR) and arbuscular mycorrhizal fungi (AMF) can improve plant fitness. We tested the growth response of wheat (Triticum aestivum [L.]), rice (Oriza sativa [L.]) and black gram (Vigna mungo [L.], Hepper) to an inoculation of AMF and PGPR alone or in combination over two years at seven locations in a region extending from the Himalayan foothills to the Indo-Gangetic plain. The AMF applied consisted of a consortium of different strains, the PGPR of two fluorescent Pseudomonas strains (Pseudomonas jessenii, R62; Pseudomonas synxantha, R81), derived from wheat rhizosphere from one test region. We found that dual inoculation of wheat with PGPR and AMF increased grain yield by 41% as compared to un-inoculated controls. Yield responses to the inoculants were highest at locations with previously low yields. AMF or PGPR alone augmented wheat grain yield by 29% and 31%, respectively. The bio-inoculants were effective both at Zero and at farmers’ practice fertilization level (70 kg N ha−1, 11 kg P ha−1 in mineral form to wheat crop). Also raw protein (nitrogen × 5.7) and mineral nutrient concentration of wheat grains (phosphorus, potassium, copper, iron, zinc, manganese) were higher after inoculation (+6% to +53%). Phosphorus use efficiency of wheat grains [kg P grain kg−1 P fertilizer] was increased by 95%. AMF and PGPR application also improved soil quality as indicated by increased soil enzyme activities of alkaline and acid phosphatase, urease and dehydrogenase. Effects on rice and black gram yields were far less pronounced over two cropping seasons, suggesting that AMF and PGPR isolated from the target crop were more efficient. We conclude that mutualistic root microorganisms have a high potential for contributing to food security and for improving nutrition status in southern countries, while safeguarding natural resources such as P stocks.
(c) Elsevier

Inoculation of root microorganisms for sustainable wheat-rice and wheat-black gram rotations in India

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Inoculation of root microorganisms for sustainable wheat-rice and wheat-black gram rotations in India