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The rhizosphere is the volume of soil under the influence of plants roots, where very important and intensive microbe–plant interactions take place. These interactions can both significantly influence plant growth and crop yields and have biotechnological applications. The rhizosphere harbors a diverse community of microorganisms that interact and compete with each other and with the plant root. The...
Plant growth promoting rhizobacteria (PGPR) have gained worldwide importance and acceptance for agricultural benefits. This is due to the emerging demand for dependence diminishing of synthetic chemical products, to the growing necessity of sustainable agriculture within a holistic vision of development and to focalize environmental protection. Scientific researches involve multidisciplinary approaches...
Plant growth promoting rhizobacteria (PGPR) are a group of free-living bacteria that colonize the rhizosphere and benefit the root growth in plants. Bacteria of diverse genera such as Azospirillium, Bacillus, Burkholderia, Klebsiella, Pseudomonas, etc., were identified as PGPR. These PGPR exert a direct effect on plant growth by inducing the production of phytohormones, supplying biologically fixed...
Among the diverse soil microflora, plant growth promoting rhizobacteria (PGPR) mark an important role in enhancing plant growth through a range of beneficial effects. This is often achieved by forming biofilms in the rhizosphere, which has advantages over planktonic mode of bacterial existence. However, the biofilm formation of PGPR has been overlooked in past research. This chapter focuses on new...
Bioformulations for plant growth promotion continue to inspire research and development in many fields. Increase in soil fertility, plant growth promotion, and suppression of phytopathogens are the targets of the bioformulation industry that leads to the development of ecofriendly environment. The synthetic chemicals used in the agriculture to increase yields, kill pathogens, pests, and weeds, have...
Plant growth promoting rhizobacteria (PGPR) are bacteria that colonize plant roots and then promote plant growth and/or reduce disease or insect damage via exudation of some active metabolites. Antagonistic PGPR have attracted much attention in their role in reducing plant diseases, especially strains of the genus Bacillus, Pseudomonas, and Burkholdeira, and there is now an increasing number of PGPR...
The management of plant diseases in the sustainable agriculture has become a challenge for plant pathologist. Increasing knowledge and growing concern of pesticide applications on environment have aroused interest in alternative methods of plant protection. Plant growth promoting rhizobacteria (PGPR) are the important group of microorganisms, which play a major role in the biocontrol of plant pathogens...
Plant diseases are caused mainly by fungi, bacteria, viruses, and nematodes, and their control is necessary to feed an increasing population. Control of plant diseases often rely on chemical pesticides, which have contributed to improvements in crop productivity and quality over the past years. However, the intensive use of agrochemical pesticides results in soil and groundwater pollution. Consequently,...
Soil-borne diseases are responsible for major crop losses worldwide. Alternatives to the use of synthetic chemicals for disease control are increasingly being sought due to among other reasons, the detrimental effects of these compounds on the environment. In this chapter, biological control of soil-borne plant diseases by means of plant growth promoting rhizobacteria (PGPR) is reviewed with emphasis...
Cajanus cajan (Pigeon pea) is an important crop of Indian subcontinent and African countries, cultivated in the tropics and subtropics. Fusarium wilt is one of the major yield and growth-limiting factors of pigeon pea. Along with nematodes such as Meloidogyne incognita and Heterodera cajani, F. udum result in highly destructive wilt disease complex, which is a major constraint for the successful...
The importance of the interactions between plants and bacteria is well known for plant development and success of agriculture. A number of succeeded examples are reported in the literature for the improvement of plant yields and protection against pathogens and pests. However, some specific niches where these interactions are essential are still unexplored, like the environments where the agriculture...
Cold-tolerant microorganisms are endowed with the ability to grow at 0°C, though their growth optima lie in the mesophilic range. To overcome the stress induced by low temperatures they have evolved a variety of adaptive responses at the cellular and molecular levels. Multiple cell membrane modifications ensure that solute transport is not impaired at low temperatures. Other mechanisms include the...
Plant growth stimulating rhizobacteria that improve the yield of graminaceous crops have been studied since the 1930s. Increases in crop yield have often been inconsistent, reflecting a lack of understanding by which PGPR exert their effects. Many PGPR are able to fix N2, which was initially assumed to boost crops by supplementing soil N. Subsequently, it became clear that for most free-living PGPR...
The extension of nitrogen-fixing symbioses to cultivated rice has been a long-standing goal in the field of biological nitrogen fixation. Endophytic bacteria have been found in virtually every plant studied, where they colonize the internal tissues of their host plant and do not cause any harmful effect to their host plant. Therefore, there is a need to use endophytic diazotrophic bacteria that can...
The Gram-positive aerobic endospore-forming bacteria (AEFB) belonging to the genus Bacillus and Paenibacillus are essentially ubiquitous and occur abundantly in most rhizospheric soils. In the rhizosphere, species of these two genera are involved in atmospheric nitrogen fixation, solubilization of soil phosphorus and uptake of micronutrients, and production of phytohormones and antimicrobial metabolites...
The plant rhizosphere is a multidimensional and dynamic ecological environment of complicated microbe–plant interactions for harnessing essential macro and micronutrients from a limited nutrient pool. Certain plant growth promoting rhizobacteria (PGPR) contain a vital enzyme, 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase (EC 4.1.99.4), which regulates ethylene production by metabolizing ACC...
Synergistic or additive interactions among the partners of the legume tripartite symbiotic association (Rhizobium–Arbuscular mycorrhizal fungi–legume) have been shown in most instances to increase legume productivity. Arbuscular mycorrhizal fungi (AMF) promote increased legume biomass production and photosynthetic rates by increasing the ratio of P to N accumulation. An increase in the P content in...
Formation and function of N2-fixing systems between bacteria from Rhizobiaceae family and legume plants from Fabaceae family are especially sensitive to molybdenum (Mo) deficiency. The hypothesis of the present work was that nitrogen fixation and assimilation in Mo deficient pea and alfalfa plants are enhanced when the nutrients were supplied through the foliage. It was established that foliar fertilization...
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