Zinc Solubilizing Bacteria for Zinc Biofortification in Cereals: A Step Toward Sustainable Nutritional Security

Hussain, Azhar; Zahir, Zahir Ahmad; Asghar, Hafiz Naeem; Ahmad, Maqshoof; Jamil, Moazzam; Naveed, Muhammad; Akhtar, Muhammad

doi:10.1007/978-981-13-0044-8_7

Cited by 48 publications

(51 citation statements)

References 136 publications

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“…Soils with less than 0.5 mg kg −1 DTPA (diethylene triamine penta-acetic acid)-extractable Zn are commonly considered to contain too little bioavailable Zn for optimal crop growth [82]. More than 50% of the agricultural soils in India and Pakistan are Zn-deficient [83]. Physical properties, such as pH, percentage of organic matter, water and clay contents, soil texture, and soil microbes, are the most critical factors that determine the bioavailability of Zn in soils [84].…”

Section: Zinc (Zn) Deficiency Can Be Eradicated Using Soil Microbesmentioning

confidence: 99%

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Possible Roles of Rhizospheric and Endophytic Microbes to Provide a Safe and Affordable Means of Crop Biofortification

Rehman

Lam

2019

Agronomy

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Biofortification has been used to improve micronutrient contents in crops for human consumption. In under-developed regions, it is important to fortify crops so that people can obtain essential micronutrients despite the limited variety in their diets. In wealthy societies, fortified crops are regarded as a “greener” choice for health supplements. Biofortification is also used in crops to boost the contents of other non-essential secondary metabolites which are considered beneficial to human health. Breeding of elite germplasms and metabolic engineering are common approaches to fortifying crops. However, the time required for breeding and the acceptance of genetically modified crops by the public have presented significant hurdles. As an alternative approach, microbe-mediated biofortification has not received the attention it deserves, despite having great potential. It has been reported that the inoculation of soil or crops with rhizospheric or endophytic microbes, respectively, can enhance the micronutrient contents in various plant tissues including roots, leaves and fruits. In this review, we highlight the applications of microbes as a sustainable and cost-effective alternative for biofortification by improving the mineral, vitamin, and beneficial secondary metabolite contents in crops through naturally occurring processes. In addition, the complex plant–microbe interactions involved in biofortification are also addressed.

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Section: Zinc (Zn) Deficiency Can Be Eradicated Using Soil Microbesmentioning

confidence: 99%

“…Zn-solubilizing bacteria improve Zn bioavailability in soil through various mechanisms of action [83]. In general, reducing the soil pH is the key to unlocking many micro-and macro-nutrients in the rhizosphere.…”

Section: Zinc (Zn) Deficiency Can Be Eradicated Using Soil Microbesmentioning

confidence: 99%

Possible Roles of Rhizospheric and Endophytic Microbes to Provide a Safe and Affordable Means of Crop Biofortification

Rehman

Lam

2019

Agronomy

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“…The PGPR are the bacteria that inhabit either the rhizosphere, the soil in the immediate vicinity of plant roots, or inside the plant tissues, helping the plants with better growth through some direct and indirect mechanisms [20,21]. There are certain PGPR species which can solubilize insoluble mineral compounds in soil through the production of organic acids along with some other growth-promoting mechanisms [22,23]. Among these, phosphate solubilizing rhizobacteria [24], zinc solubilizing rhizobacteria [25], and potassium solubilizing rhizobacteria [26] are well documented.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Biochar-Microbe Synergies for Improved Growth, Yield of Maize, and Post-Harvest Soil Characteristics in a Semi-Arid Climate

et al. 2020

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Arid and semi-arid regions are characterized by high temperature and low rainfall, leading to degraded agricultural soils of alkaline calcareous nature with low organic matter contents. Less availability of indigenous nutrients and efficacy of applied fertilizers are the major issues of crop production in these soils. Biochar application, in combination with plant growth promoting rhizobacteria with the ability to solubilize nutrients, can be an effective strategy for improving soil health and nutrient availability to crops under these conditions. Experiments were planned to evaluate the impact of biochar obtained from different sources in combination with acid-producing, nutrient-solubilizing Bacillus sp. ZM20 on soil biological properties and growth of maize (Zea mays L.) crops under natural conditions. Various biochar treatments, viz. wheat (Triticum aestivum L.) straw biochar, Egyptian acacia (Vachellia nilotica L.) biochar, and farm-yard manure biochar with and without Bacillus sp. ZM20, were used along with control. Soil used for pot and field trials was sandy loam in texture with poor water holding capacity and deficient in nutrients. Results of the pot trial showed that fresh and dry biomass, 1000 grain weight, and grain yield was significantly improved by application of biochar of different sources with and without Bacillus sp. ZM20. Application of biochar along with Bacillus sp. ZM20 also improved soil biological properties, i.e., soil organic matter, microbial biomass carbon, ammonium, and nitrate nitrogen. It was also observed that a combined application of biochar with Bacillus sp. ZM20 was more effective than a separate application of biochar. The results of wheat straw biochar along with Bacillus sp. ZM20 were better as compared to farm-yard manure biochar and Egyptian acacia biochar. Maximum increase (25.77%) in grain yield was observed in the treatment where wheat straw biochar (0.2%) was applied in combination with Bacillus sp. ZM20. In conclusion, combined application of wheat straw biochar (0.2%) inoculated with Bacillus sp. ZM20 was the most effective treatment in improving the biological soil properties, plant growth, yield, and quality of maize crop as compared to all other treatments.

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“…Zinc deficiency is considered the fifth most important human-related death in less developed countries. Therefore, addressing Zn deficiency in agriculture is getting top priority among other minor nutrients [104][105][106]. Microbial inoculants have been identified to solubilize the complex form of zinc in soil [107].…”

Section: Zinc Solubilizing Biofertilizersmentioning

confidence: 99%

Microbes as Biofertilizers, a Potential Approach for Sustainable Crop Production

2021

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Continuous decline of earth’s natural resources and increased use of hazardous chemical fertilizers pose a great concern for the future of agriculture. Biofertilizers are a promising alternative to hazardous chemical fertilizers and are gaining importance for attaining sustainable agriculture. Biofertilizers play a key role in increasing crop yield and maintaining long-term soil fertility, which is essential for meeting global food demand. Microbes can interact with the crop plants and enhance their immunity, growth, and development. Nitrogen, phosphorous, potassium, zinc, and silica are the essential nutrients required for the proper growth of crops, but these nutrients are naturally present in insolubilized or complex forms. Certain microorganisms render them soluble and make them available to the plants. The potential microbes, their mode of action, along with their effect on crops, are discussed in this review. Biofertilizers, being cost effective, non-toxic, and eco-friendly, serve as a good substitute for expensive and harmful chemical fertilizers. The knowledge gained from this review can help us to understand the importance of microbes in agriculture and the ways to formulate these microbes as biofertilizers for sustainable crop production.

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Zinc Solubilizing Bacteria for Zinc Biofortification in Cereals: A Step Toward Sustainable Nutritional Security

Cited by 48 publications

References 136 publications

Possible Roles of Rhizospheric and Endophytic Microbes to Provide a Safe and Affordable Means of Crop Biofortification

Possible Roles of Rhizospheric and Endophytic Microbes to Provide a Safe and Affordable Means of Crop Biofortification

Evaluating Biochar-Microbe Synergies for Improved Growth, Yield of Maize, and Post-Harvest Soil Characteristics in a Semi-Arid Climate

Microbes as Biofertilizers, a Potential Approach for Sustainable Crop Production

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