eChapters

Introduction

Lithosphere, including the earth’s crust, is helpful in providing the base or medium for sustenance of most life processes and forms, interwoven in fine network interdependencies within themselves and the environment surrounding them i.e. ecosystems. Terrestrial ecosystem contains an important dynamic living matrix termed soil, which is critical for agricultural production and food security. Soil forms the medium for growth and maintenance of a variety of plant species while the plant roots in the soil represent a four dimensional region in space and time of profuse activity relative to the bulk soil, revolving around pH, nutrient, redox potential, and exudate gradients changing as distance from the root increases (Marschner, 1995). The soil region adhering the plant roots is being strongly influenced by the presence of these roots and is characterized by high rates of microbial population and activity and referred as rhizosphere (the soil adhering to plant roots).

Unlike root-free soil, the rhizosphere around growing plants is a very dynamic environment that hosts a much higher number of microbes, in particular bacteria. Microbes interact with each other and with plants in symbiotic, associative, neutral or antagonistic ways. A plant colonized or penetrated by a microorganism can either result in asymptomatic or disease or form an association or symbiosis, depending on the cells’ perception of each other and how the environment affects that interaction. Microbes that penetrate and colonize plants have developed elaborate strategies to subvert plant defenses.

The rhizosphere is the narrow zone of soil surrounding the root that is under the immediate influence of the root system. This zone is rich in nutrients when compared with the bulk soil, due to the accumulation of a variety of organic compounds released from roots by exudation, secretion and deposition. Organic compounds released by plant roots include amino acids, fatty acids, nucleotides, organic acids, phenolics, plant growth regulators, putrescine, sterols, sugars and vitamins. Because these organic compounds can be used as carbon and energy source by microorganisms, microbial growth and activity is particularly intense in the rhizosphere.

Abstract

Rhizobia are soil bacteria that fix atmospheric dinitrogen after establishing symbiotic relationship inside the root nodules of legumes (Fabaceae). Plant Growth Promoting Rhizobacteria are the group of bacteria which thrive in the rhizosphere region and enhance the plant growth through direct & indirect mechanisms. Pulses are being inoculated with specific rhizobial strains to have better nodulation in India. The native rhizobial strains from the root nodules of legumes from different agroclimatic zones of Odisha was isolated, characterised and screened for PGP activities. Out of all eleven isolates showed similar characteristics with the family Rhizobiacae. Among them six isolates contained nif-gene and PGPR activity (B2, B4, B5, B6, B7 and B8) were applied to seeds, that helped in faster germination and better elongation of root and shoot. The observations were statistically significant.

Introduction
Plant protection is a critical component of modern agriculture, aimed at safeguarding crops from diseases, pests, and weeds that can significantly impact yield and quality. Chapter 10 explores the science of plant protection, focusing on the various disciplines that contribute to maintaining healthy crops and ensuring food security. The chapter begins with an overview of plant pathology, the study of plant diseases caused by pathogens such as fungi, bacteria, viruses, and nematodes. Key principles of plant pathology are discussed, including the nature of plant diseases, their modes of transmission, and the factors that influence disease development. This section also highlights the importance of accurate disease diagnosis, which is essential for implementing effective prevention and control measures. Entomology, the study of insects and their interactions with plants, is another crucial aspect of plant protection covered in this chapter. The principles of entomology are examined, with a focus on the identification and management of insect pests that threaten crops. Various pest management strategies, including biological, chemical, and cultural methods, are explored, emphasizing the need for a holistic approach to pest control. Integrated Pest Management (IPM) is a central theme in plant protection, combining multiple strategies to manage pests in an environmentally sustainable manner. The chapter discusses the advantages of IPM, such as reduced reliance on chemical pesticides and minimized environmental impact, as well as the challenges associated with its implementation. Integrated Disease and Pest Management (IDPM) is also introduced, which integrates plant pathology and entomology principles to develop comprehensive management strategies that address both diseases and pests. The chapter further explores the role of pesticides in plant protection, including their benefits and potential risks. Safety measures for pesticide use are emphasized to protect both human health and the environment. Integrated Weed Management (IWM) is also discussed as an essential component of plant protection, with strategies for managing weeds that compete with crops for resources. The importance of plant protection sciences in food security is highlighted, particularly in the context of pest management, disease control, and weed management. These disciplines contribute to sustainable agriculture by enhancing crop yield and quality while promoting environmental sustainability.

5.1 Plant Breeder’s Rights (PBR) and Protection of Plant Varieties and Farmers’ Rights (PPV&FR) Act
5.1.1 Introduction
In the context of biotechnology and agricultural innovation, Plant Breeder’s Rights (PBRs) offer exclusive intellectual property protection to individuals or organizations that breed, develop, or discover new plant varieties. These rights ensure economic incentives for plant breeders while promoting innovation in seed development and agricultural productivity. In India, the unique and inclusive Protection of Plant Varieties and Farmers’ Rights Act (PPV&FR), 2001, balances breeders’ rights with recognition of farmers’ contributions, making it one of the most progressive legislations in the world.
5.1.2 Concept of Plant Breeder’s Rights (PBR)
Plant Breeder’s Rights refer to the exclusive rights granted to plant breeders to produce, sell, market, distribute, import or export their registered plant varieties. These rights are sui generis, meaning they are a special form of IP distinct from patents, developed to cater specifically to plant varieties.
Key Objectives of PBR
• Encourage investment in plant breeding and biotechnology.
• Ensure access to improved crop varieties.
• Prevent unauthorized commercial exploitation of novel varieties.
• Facilitate biodiversity conservation through formal registration systems.

Abstract

The nutrition of tobacco plants relies upon the plant genotypic variation and soil characteristics which also influence the various microflora that inhabit the rhizosphere. The investigations were aimed to analyze the role of native and inoculated plant growth promoting bacteria on the uptake of major plant nutrients viz., nitrogen, phosphorus and potassium and also their supportive nature in reducing the infection caused by  Pythium aphanidermatum, the damping-off fungus of tobacco in nursery. Rhizosphere microorganisms include PGPR viz., Azotobacter, Azospirillum, Pseudomonas and Bacillus, AM fungi and Streptomyces. The addition of these microbes as bioinoculants in tobacco integrated nutrient and disease management resulted in better quality tobacco worth premium price.

Polyacrylamide

Polyacrylamide is a cross-linked polymer of acrylamide. The length of the polymer chains is dictated by the concentration of acrylamide used, which is typically between 3.5 and 20%. Polyacrylamide gels are significantly more annoying to prepare than agarose gels. Because oxygen inhibits the polymer- ization process, they must be poured between glass plates (or cylinders).

Introduction

This chapter gives first hand information on PCR for beginners. PCR is used to amplify a short, well-defined part of a DNA strand. This can be a single gene, or just a part of a gene. As opposed to living organisms, the PCR process can copy only short DNA fragments; usually up to 10 kb (kb stands for kilo base pairs). Certain methods can copy fragments up to 40 kb in size, which is still much less than the chromosomal DNA of a eukaryotic cell-for example, a human cell contains about three billion base pairs (Kary Mullis, 1983).

History of PCR

A 1971 Kleppe and co-workers first described a method using an enzymatic assay to replicate a short DNA template with primers in vitro. However, this early manifestation of the basic PCR principle did not receive much attention, and the invention of the polymerase chain reaction in 1983 is generally credited to Kary Mullis.

At the core of the PCR method is the use of a suitable DNA polymerase able to withstand the high temperatures of >90°C (>195°F) required for separation of the two DNA strands in the DNA double helix after each replication cycle. The DNA polymerases initially employed for in vitro experiments presaging PCR were unable to withstand these high temperatures. So the early procedures for DNA replication were very inefficient, time consuming, and required large amounts of DNA polymerase and continual handling throughout the process.

The discovery in 1976 of Taq polymerase (a DNA polymerase purified from the thermophilic bacterium, Thermus aquaticus, which naturally occurs in hot (50 to 80 °C (120 to 175 °F) environments) paved the way for dramatic improvements of the PCR method. The DNA polymerase isolated from T. aquaticus is stable at high temperatures remaining active even after DNA denaturation, thus obviating the need to add new DNA polymerase after each cycle. This allowed an automated thermocycler-based process for DNA amplification.

Developed the PCR in 1984 by Kary Mullis, PCR is now a common and often indispensable technique used in medical and biological research labs for a variety of applications. These include DNA cloning for sequencing, DNA-based phylogeny, or functional analysis of genes; the diagnosis of hereditary diseases; the identification of genetic fingerprints (used in forensic sciences and paternity testing); and the detection and diagnosis of infectious diseases. In 1993 Mullis was awarded the Nobel Prize in Chemistry for his work on PCR.

Abstract

Potassium is a very essential nutrient element that is required for proper health, growth, functioning and productivity of plants. However, up to 98% of this very important mineral is held up in insoluble, unavailable forms in the soil and with only approximately 2% soluble form available for plant use. Biofertilizers add nutrients to the soil for plant use by some mechanisms like the breakdown of phosphorus, potassium, fixing nitrogen, and also synthesizing some substances which in turn enhance plant growth. These processes take place naturally. Microorganisms that solubilize potassium have demonstrated an increased potassium uptake by plants when added as bio-inoculants consequently resulting in increased yield by these plants. This article reviewed the methods of isolation of potassium solubilizing bacteria and fungi and their use as biofertilizers. Data are presented showing summary of researches conducted on potassium solubilizing microorganisms and their findings. Figures on production efforts of biofertilizers in India per year and by states are also added.

Potassium (K) is among the most important essential macronutrients for plant growth. About 98% of the potassium in the earth’s crust exists in insoluble forms as rocks and silicate minerals, resulting in very low concentrations of soluble potassium in the soil for plant growth and development. Potassium is never incorporated in any organic compound and even in the plant system it remains as K⁺ ion. It does not form any gas that could be lost to the atmosphere. It does not cause eutrophication. When left in the ecosystem as such, it is not at all toxic.Potassium activates enzymes, maintains cell turgor, enhances photosynthesis, reduces respiration, helps in transport of sugars and starches, and is essential for protein synthesis. In addition to plant metabolism, potassium improves crop quality because it helps in grain filling and kernel weight, strengthens straw, increases disease resistance and helps the plant better to withstand stress.

Potassium in Soils

Soils usually contain potassium in larger amounts than any other nutrients. Total K content in soil is 30,000- 50,000 kg/ha in top layer of the soil. Nearly 98 % of K bound in the mineral form and 2 % is in soil solution. Generally, potassium in soils exist in four forms (often called fractions), their availability to crop roots is considerably different.

Introduction 
It is commonly acknowledged that the swift rise in urbanization and population expansion is the primary reason for the increasing consumption of fossil fuels, which ultimately results in the exhaustion of fuels generated from petroleum. Globally, the scarcity of fossil fuels poses a significant challenge. Furthermore, there are significant worries about the negative impacts of the heavy reliance on petroleum-based fuels on the economy, energy and the environment conservation. Consequently, extensive research has been dedicated to identifying alternative sources that can mitigate the dependence on fossil fuels [1]. Biofuels have garnered worldwide attention as a potential substitute for fossil fuel-derived fuels, given their distinctive qualities [2]. Utilizing a variety of plant sources, including sugarcane, corn, soybeans, vegetables, palm oil, and Jatropha (often used in Africa), biofuel production is progressing on almost every continent. Bioethanol is successfully used as a biodiesel in addition to gasoline for otto-cycle engines in nations like the USA and Brazil [3]. Conversely, biodiesel represents a significant category of biofuel capable of partially or fully replacing diesel obtained from fossil fuels. Biodiesel is made via a process called trans-esterification that uses renewable biolipids [4]. Biodiesel can be produced from oil that comes from nonedible agricultural seeds or kernels [5]. Furthermore, edible oils from plants such as sunflower, palm, and soybean are used as feedstocks to produce biodiesel [6]. In the field of biofuel research, nanotechnology and nanomaterials have proven to be useful instruments for improving output quality at a reasonable cost. Algae stands out prominently in discussions about biofuel production due to concerns related to food resources. Types of biofuels and their sources are represented in the (Fig.1). The use of crops and plants yielding food is considered unsuitable for prioritizing biofuel production due to potential disruptions in food supply. Notably, various algal species vary in their production capacity. The utilization of nanoparticles (NPs) is advantageous in biofuel synthesis due to their unique characteristics, including a substantial surface area to volume ratio, adsorption capacity, high crystallinity, and stability. This distinguishes them from competing sources as better possibilities [7]. In the process of creating biofuels, metal oxide nanoparticles and carbon nanotubes are widely used as nano-catalysts because of their extra characteristics that allow for their high potential recovery [8]. The overall procedure for producing biodiesel on a small scale and for experimental purposes using algae are shown in the (Fig.2).

Introduction 
The overuse of fossil fuels is expanding simultaneously with society’s rapid development, which culminates in a decrease in fossil energy and a very serious deterioration of the environment. The purpose is to make the carbon neutral as fast as possible, which will make the invention of alternative energy sources to replace the fossil fuels. To make world a better place to live, fossil energy is highly needed to be conserved and measures should be made to limit the use of fossil energy. After many researches, the alternate to fossil energy has been made in the form of “BIODIESEL”. Biodiesel, which is produced from renewable resources such as vegetable oil is a new clean alternative to fossil fuel. Biodiesel in the new era of scientific field is mainly produced from Microalgae. Production of biodiesel from microalgae ensures reusing carbon resources from nature. This method contributes to achieve in replacing petroleum use and also helps in reducing pollution in the environment. Biodiesel consist primarily of esters which is formed by methanol or by ethanol and long chains of fatty acids which may be saturated or unsaturated such as palmitic acid, stearic acid, oleic acid and linoleic acid. This is the main and ultimate reason why production and use of biodiesel is attracted the attention of researches worldwide. The biodiesel is developed in three generations that is First, Second and Third generation Microalgae are single-celled organisms which are microscopic. They are an essential component of carbon cycle and they can exploit carbon sources in water and soil efficiently and have plenty of advantages over the other biodiesel sources that are conventional oil crops such as wheat, palm, corns, soybeans, maize and rapeseed. In this century, one of the most important environmental issues is global warming, that is caused by released of greenhouse gases. These microalgae have high rates of biomass production and can survive in a variety of circumstances, such as freshwater, saltwater, and wastewater (Muhammad Abdullah et.al 2024) Their ability to be grown on non-arable ground and their lack of resources competition with food crops are two of their most significant and crucial advantages. The process of producing biodiesel from the microalgae involves many stages. The stepwise structure involves lipid extraction, microalgae cell disruption, harvesting, culture and transesterification. Microalgae re a promising source of biodiesel as they have a high lipid content and can grow quickly. But they are complex in composition and they require a specialized harvesting system. Nanoparticles are an ultrafine unit and have dimensions which are stated in nanometers. These nanoparticles can be detected in the natural environment and can also be generated by human activity. Because of their sub-microscopic size, they boast unique material properties and may be used in many different kinds of fields, namely environmental remediation, engineering and medical care. In 2008, International Organization for Standardization (ISO) defined this nanoparticle as a discrete nano-object in which all the Cartesian dimensions are less than 100nm. Nanoparticles are classified into different types according to their shape,

Abstract

Trichoderma species play a vital role in the management of plant diseases in association with different commercial bioformutlations of the fungus. Its role as a successful pollution free environment and friendly mechanism of action has been highly exploited. The diversity of species based on location, type of agri-land and association with different fauna  and flora has been instrumental in large upsurge of biological methods of Plant disease management. Pollution of agri-land soils with chemicals, heavy metals and development of resistance to diseases has become an emerging problem coupled with the high costs of Infrastructure. Thus, the interest in alternative biologically based systems is the need for bioremediation, bioecology and biocontrol with Trichoderma.

1. Introduction 
The growing demand for fossil fuels around the world and their extensive use, which degrades the environment, have been serious issues. More precisely, it is predicted that global energy consumption will rise by 49% between 2007 and 2035 due to social pressure, population growth, and economic expansion (Cheah et al., 2016; Prasad et al., 2016). In order to replace fossil fuels, alternative energy resources must be developed, according to energy security and environmental sustainability. The most promising bio-fuel among the alternatives to gasoline is bio-ethanol, which can be used as the only fuel in compatible automobile engines or blended with gasoline up to 30% without requiring engine changes (Safarian and Unnthorsson, 2018). Bio-ethanol has a higher-octane number, which enables engines to run at high compression ratios, and a high oxygen content, which improves combustion efficiency (Branco et al., 2019). Grain, sugar beets, corn, and sugarcane could all be used to make bio-ethanol. Together, Brazil and the United States account for over 90% of the world’s bio-ethanol production, with 59% and 27% coming from each country, respectively (Branco et al., 2019).The Policy Energy Act and Energy Independence and Security Act, which aim to consume 136 billion gallons of bio-ethanol by 2022, are the main drivers of the USA’s remarkably high production rate (Menon and Rao, 2012; Tran et al., 2019). Unfortunately, the world’s food security is now in jeopardy due to the manufacture of bio-ethanol from the aforementioned edible energy crops. For the synthesis of bio-ethanol, lignocellulosic biomass-such as agricultural residues, forest woody residues, micro-algae, and even municipal solid waste is consequently a more advantageous source. Cellulose, hemicellulose, and lignin make up the lignocellulosic complex structure. While hemicellulose is in charge of binding and 88 | Biofuels Production Using Sustainable Bioprocessing Technologies lignin guarantees the toughness of the entire stricture, cellulose, a polymer made of glucose, gives plants structural support (Kumar et al., 2016; Prasad et al., 2016). According to Tran et al. (2019), pre-treatment is a crucial step in order to: (i) increase the amorphous area to facilitate hydrolysis; (ii) improve the porosity of the porous matrix to facilitate enzymatic and chemical hydrolysis; and (iii) separate cellulose from lignin and hemicellulose. The majority of the most successful pre-treatment techniques now in use are physio-chemical and chemical techniques, which also produce harmful compounds such furfural (Liyamen and Ricke, 2012). Other techniques are also used, each with advantages and disadvantages. For example, biological pre-treatment is environmentally benign but does not generate large amounts of material. Compared to the thermochemical approach, the biochemical conversion process performed better and was more ecologically friendly (Mu et al., 2010; Liyamen and Ricke, 2012; Kumar et al., 2019). It should be mentioned that the pre-treatment cost should also include the expense of detoxifying harmful inhibitors, which are created as a result of the pre-treatment technique (Liyamen and Ricke, 2012). All things considered, a successful pre-treatment ought to be both financially and environmentally responsible. It’s also critical to make sure that other advantageous aspect like maximum energy savings, waste and wastewater recycling, material recovery, and the use of a biorefinery method are taken into account throughout the lignocellulosic bioethanol production process (Kumar et al., 2019). Figure 1. Overview of how ILs typically pre-treat lignocellulosic biomass for the manufacture of biofuel (cheah et al., 2020).

Microorganisms, being ubiquitous, are found in soil, air, water, food, sewage, on body surfaces as well as on degrading and decomposing substances. Their survival and continued growth mostly depend on an adequate supply of nutrients and favourable growth environments. The culture media (nutrients) consisting of chemicals support the growth of microorganisms in a given condition. They are devised in such a way that the organism should get all the nutritional requirements. These are usually prepared in laboratory by weighing and dispensing the individual ingredients. Generally, the common media contain both inorganic and organic nutrients; however, for the cultivation of large number of microorganisms, specialized media are required.

Basically the culture media are of three types: (1) Natural, (2) Semi synthetic and (3) Synthetic.

Introduction
Ocular micrometer and stage micrometer are used to measure the size of microorganisms. The Ocular micrometer consists of a circular disk of glass which has graduations engraved on surface. A stage micrometer or objective micrometer has scribed lines on it that are exactly 0.01mm (10 micrometer) apart. Ocular micrometer is calibrated for the objective first. To calibrate the ocular micrometer for a given objective, the two scales are superimposed and determined how many of the ocular gradation coincide with one graduation on the stage micrometer scales. Thus, the distance between the graduations on the ocular micrometer can be determined and so the size of the organism can be determined.
Materials
1. Ocular micrometer
2. Stage micrometer
3. Microscope
4. Stained slides of yeast or bacteria

Abstract
 
This work aimed to evaluate agromicrobes preponderance and activity in maize ecosystem of same soil types (diara land/fragile land) under different agricultural practices. We conducted a five year field survey of grower’s field to investigate the effect of tillage system, maize plant genotypes and soil organic carbon level on preponderance of diazotroph (Azotobacter), plant growth promoting rhizobacteria (Pseudomonas) and arbuscular mycorrhiza (AM) colonization of maize ecosystem. No tillage, traditional maize cultivar and soil organic carbon (>1%) appear to support the preponderance of targeted diazotrophs, plant growth promoting rhizobacteria (PGPR) in maize rhizosphere and AM colonization of maize root. Elevation in the preponderance of bacteria, Azospirillum population in maize root, AM colonization, microbial biomass, nitrogen mineralization, phosphate solubilising microbes, cellulose hydrolyzing microbes and acetylene reducing assay (ARA)  of maize root appeared due to organic fertilization of maize crop.

Abstract

Microbes are key ingredients of various ecosystems and backbone of modern biotechnology and industry. In addition to their cultivation, purification and characterization, preservation of microorganisms is equally important. Different preservation methods and protocols have been developed for long term preservation of microbes. Microbial Resource Centers (MRCs) are providing active services in the field of life sciences. National Centre for Microbial Resource (NCMR) at National center for Cell Science (NCCS), Pune is one of the MRCs. Unlike aerobes little work has been done in the area of cultivation and preservation of anaerobic microbes. In the previous chapter we have discussed the technicalities and problems of anaerobic cultivation. The aim of current chapter is to provide the recent overview of preservation of anaerobic microorganisms like methanogens, sulfate and metal reducers and the obligate anaerobes of clinical and industrial importance with fermentative mode of life style.