eChapters

Introduction

Salinity is a significant environmental stress for crop plants it account for about 70% of the losses in the crop yield. It adversely affects seed germination, seedling growth and different metabolic activities in plants (Begum et al. 1997). It reduces DNA, RNA and protein synthesis and differentially influences the activities of the hydrolytic enzymes (Kumar et al. 1996).

Plants are classified as glycophytes or halophytes according to their capacity to grow on high salt medium. Most crop plants are glycophytes and cannot tolerate salt stress. High salt concentration decreases the osmotic potential of soil solution creating a water stress in plants. Secondly they cause severe ion toxicity since Na+ is not readily sequestered into vacuoles as in halophytes.

The widespread nature of saline soils compounded by the geographical distribution of man’s population and agricultural practices are largely succeeded in increasing salinization in arid and semi-arid lands. Most of the crops are sensitive to even low concentration of NaCl.

Introduction Biochemical techniques are a set of methods/tools used to analyze and study biomolecules, cellular processes of body and disease diagnosis. The techniques form the cornerstone of modern research and are applied in various fields such as medical science, forensic science, drug discovery as well as environmental studies. Briefly, such techniques are used to isolate, analyze, and manipulate biomolecules such as proteins, nucleic acids, lipids, and carbohydrates. It is therefore imperative to understand the principle of biochemical techniques for pursuing a career in biological science such as Biochemistry, molecular biology or Biochemistry. Biochemical techniques offer several uses across multiple scientific areas such as: • Medical Research: In the identification of biomarkers, diagnosis of disease conditions such as diabetes and cancer and development of therapeutic interventions. • Pharmaceutical Industry: In this biochemical

Bioclimatology examines relationships between climate and living organisms, including crops, livestock and humans. It draws on biology, ecology, meteorology, architecture and physiology to explain how temperature, humidity, radiation and wind influence development, comfort, health and productivity. This chapter introduces bioclimatic indices such as the Temperature-Humidity Index, Humidex, wind chill and thermal-comfort measures. Agricultural applications include crop and livestock suitability, heat-stress assessment, housing design, work planning and development of resilient farming systems. Understanding biological responses to climatic conditions supports appropriate management interventions and helps protect productivity and welfare. Bioclimatic analysis therefore connects atmospheric conditions with practical decisions involving plants, animals and people.

Abstract

With increasing population and subsequent human requirements; the generation of municipal solid waste (MSW) has increased all over the world. In India, the safe disposal of the municipal solid waste still remaines a problem for the authorities concerned. Depending upon the nature and type of the MSW, there are physical and chemical methods for the disposal of the waste, but these methods have their own limitations. Those limitations may be overcome by biological methods. Higher number of microorganisms are present in MSW which may either be pathogenic or nonpathogenic. These microorganisms may play a vital role in bioconversion of MSW into compost. The compost thus produced is useful in increasing soil fertility and reducing the concentration of the waste.

Bioenergetics is a branch of Biochemistry that focuses on the study of energy transformation and utilization in living organisms. It primarily deals with how cells capture, store, and utilize energy to drive various biological processes essential for sustaining life. The flow of energy in biological systems operates in accordance with the principles of thermodynamics, which govern the conversion of energy from one form to another. In living cells, energy is typically obtained through biochemical reactions involving the breakdown of organic compounds such as carbohydrates, fats, and proteins. This energy is then utilized for various physiological processes like the synthesis of biomolecules, active transport of ions, muscle contraction, and nerve conduction, enabling the cell to maintain its structural and functional integrity. Thermodynamics, a branch of physical chemistry, plays a crucial role in bioenergetics as it explains the changes in energy associated with biochemical reactions. In biochemical thermodynamics, also referred to as bioenergetics, the primary focus is on how energy released from one reaction can be utilized to drive another reaction that requires energy input. This is achieved through

The diets of over two-thirds of the world’s population lack one or more essential mineral elements. This can be remedied through dietary diversification, mineral supplementation, food fortification, or increasing the concentrations and/or bioavailability of mineral elements in produce (biofortification) involving aspects of soil science, plant physiology and genetics underpinning crop biofortification strategies, as well as agronomic and genetic approaches currently taken to biofortify food crops with the mineral elements most commonly lacking in human diets: iron (Fe), zinc (Zn), copper (Cu), calcium (Ca), magnesium (Mg), iodine (I) and selenium (Se).

According to Watson, bio-herbicides are living entities (natural enemies) used deliberately to suppress the growth or reduce the population of a weed species. This may include an insect; a microbe or a parasite nematode. These organisms operate directly or indirectly (by producing toxins) and their mode of action proves deleterious to the weed species. The latter toxins are termed bio rationals, phytotoxins or natural herbicides and are excluded in the definition.Bio-herbicides are formulations containing plant pathogens capable of mass production in vitro that are applied directly to target weeds uniformly to kill or suppress their growth. This method employs the annual release of a bio-agent into specific weed infested fields to infest and kill susceptible weeds. At present only the potential use of fungal pathogens as mycoherbicide has been studied in depth. Exploitation of bacteria seems promising where use of viruses as biocontrol agents are problematic since they are not host specific and require vector for their transmission.

COMMON FEATURES OF BIOLOGICAL MEMBRANES

Membranes are sheetlike, just a few molecules thick and form closed boundaries between cell compartments.

Membranes contain lipids and proteins, with small amounts of carbohydrayes linked to the lipids and proteins.

Lipids in membranes are small with hydrophobic and hydrophilic portions. Lipid bilayers provide a barrier to the diffusion of polar molecules.

Characteristic functions of membranes are mediated by specific proteins, serving as pumps, channels, receptors, energy transducers and enzymes.

Membrane components associate through noncovalent interactions.

Membranes are asymmetrical, with two sides of the membrane differing from each other.

Lipid and protein molecules often diffuse rapidly in the plane of the membrane.

Central transport of ions and molecules into and out of the cell.

Generate proton gradients for ATP production by oxidative phosphorylation.

Receptors bind extracellular signals and transduce the signal to cell interior.

Introduction

After water, nitrogen is the most critical nutritive element for crop productivity and human efforts to produce food and energy have greatly changed the nitrogen cycle of the earth. Sustainable cropping systems throughout history and across the world have relied on the combination of a cereal with an N-fixing legume. In recent history, cereals have dominated global agriculture, while legume areas and productivity have stagnated or even declined. An atmosphere around us contains nearly 78% nitrogen, which is in free form. Hence it is not available to plants. At present, India produces around 206 million metric tones of foodgrains for its growing population, increased foodgrain cannot be produced unless we carefully make use of biological nitrogen. Biological nitrogen fixation is the key to sustain agricultural productivity through the application of biofertilizers in the field. However, there is an urgent need to transfer this technology on the field to farmers and industry by producing these fertilizers on large scale.

Tissue or cell samples from a living organism, different cell cultures grown in a laboratory incubator under controlled conditions, homogenates or extracts of cells and tissues, solutions of isolated and purified components (e.g. proteins, nucleic acids) can all be referred to as biological samples. As the medium of life is water, the majority of biological samples can be defined as aqueous solutions with one or more components, colloidal systems, or water-based suspensions (e.g. bacterial cells dispersed in a liquid medium). Consequently, most biochemical experiments also take place in aqueous environments. Different solids (e.g. chemical substances obtained from different companies, synthetic oligonucleotides or peptides) are also often necessary for biochemical research. In most cases, solids are dissolved in water (or sometimes in other solvents) prior to the experiments. Therefore, the methods of preparing solutions and measuring accurately the weight of the required solids will also be discussed below. Sometimes we use gases in the laboratory. These can be stored in gas cylinders (e.g. O₂), in Dewar flasks in liquid state (e.g. liquid nitrogen), or dissolved in water (e.g. HCl or NH₃). By working with gases it is very important to follow all safety instructions to avoid fire, explosions, frostbite or (in case of inhalation) asphyxia or poisoning.

The weight of living plant material contained above and below a unit of ground surface area at a given point of time, is known as plant “Biomass”. Biomass is of utter importance because it provides energy source (Roberts et al. 1987).

Biomass, which has dimensions of mass per unit, is expressed as g m^-2, kg ha^-1 or t ha^-1.

Measurement of Biomass

The area (in the crop field) under study is divided into a number of equal squares or rectangular plots measuring 1.0 m² or 0.5 m². Each square is designated with a particular number. Sample can be harvested from a small area or quadrate at the centre of each square; the remaining peripheral area serving as buffer zone (Wiegert, 1962).

Depending upon the growth pattern of plant species two different designs have been adopted for the sampling:

Biochemistry: An Overview of Biomolecules Biochemistry is a branch of science that delves into the chemical composition and interactions of cells and organisms. It focuses on the molecular structures found within biological systems, their chemical characteristics, functions, and the reactions they undergo. By studying these molecules, biochemists gain insights into the fundamental processes that sustain life. Properties of Biomolecules General Characteristics Biomolecules are fundamentally organic compounds, sharing similar properties with typical organic molecules. They obey the same physical and chemical principles, undergo similar reactions, and adhere to universal physical laws. However, their complexity and biological specificity distinguish them from simpler organic compounds. Composition and Structural Features The backbone of biomolecules is predominantly composed of carbon, which forms four covalent bonds, often exhibiting a tetrahedral geometry. Carbon skeletons can exist in diverse forms like linear,

Introduction

Several hazardous chemicals, microbes, and techniques like recombinant DNA technology are used for research and development work in research Institutes and universities. Therefore, the researchers, technical, helping and supporting staffs as well as the laboratory outputs must be kept free from contaminations. Thus, biosafety is necessary to prevent unintentional exposure/ release of hazardous chemicals, microbes/pathogens, and toxins to the laboratory staff and environment. Following the biosafety guidelines and ethical considerations are essential to maintain safety standards for the researchers as well as the environment. This chapter deals with various biosafety measures and ethical issues to be strictly followed while working in a research laboratory. The required safety level needs to be determined as per the chemical/biological materials are used in the laboratory to keep the researcher/environment safe for sustainable research and developmental activities.

Biosafety

The term biosafety is used to describe the procedure and policies needed to ensure environmental and personal safety. Biosafety refers to the containment principles, technologies and practices that are implemented to prevent unintentional exposure to pathogens, toxins, or their accidental release into the environment. A fundamental objective of any biosafety program is the containment of potentially harmful chemical/biological agents as precautionary safety measures.

Why Biosafety?

With the increasing number of countries adopting molecular biology tools and techniques in life science research and development activities, especially in the areas of agriculture and medicine, the biosafety issues are gaining importance to ensure biological safety for the public and the environment. Conducting research in safe and sustainable manner is not only a personal requirement but essential collective efforts to ensure biological safety for a clean and safe environment. This requires rules, regulations, monitoring bodies, and awareness among the workers as well as the public. Therefore, biosafety per se is an integral part of laboratory research and requires awareness among the researchers so that biological safety can be well taken care from the grassroot level.

Introduction
Biotechnology represents a transformative force in modern agriculture, offering innovative solutions to enhance crop production, improve resistance to diseases, and address the global challenges of food security and climate change. Chapter 9 delves into the multifaceted role of biotechnology, particularly in the realm of genetic innovation, and how it is reshaping the agricultural landscape. The chapter begins by exploring the various applications of biotechnology in crop improvement. This includes the development of genetically modified organisms (GMOs) and transgenic crops, which have been engineered to exhibit desirable traits such as increased yield, pest resistance, and enhanced nutritional content. These advancements have significantly contributed to the global food supply, particularly in regions facing harsh climatic conditions or limited agricultural resources. A detailed examination of genomic tools and techniques follows, highlighting the sophisticated methodologies employed in biotechnology. Techniques such as CRISPR -Cas9 gene editing, marker-assisted selection, and genomic sequencing are discussed, showcasing their pivotal role in accelerating the development of improved crop varieties. These tools have enabled scientists to manipulate genetic material with unprecedented precision, paving the way for more efficient and targeted crop breeding programs. The chapter also addresses the role of biotechnology in crop protection, emphasizing its importance in developing crops that are resistant to pests, diseases, and environmental stresses. By enhancing the natural defense mechanisms of plants, biotechnology reduces the need for chemical pesticides, thereby promoting more sustainable agricultural practices and minimizing the environmental impact of farming. The importance of biotechnology and genetic engineering in ensuring food security is a central theme of this chapter. As the global population continues to grow, the demand for food is expected to increase dramatically. Biotechnology offers a viable solution to meet this demand by enabling the production of higheryielding and more resilient crops. This section also explores the ethical and regulatory considerations surrounding the use of GMOs and other biotechnological innovations in agriculture.

Bird of Paradise, belonging to the genus Strelitzia, is a distinctive ornamental cut flower recognized for its striking inflorescences and architectural form. This chapter covers its origin, botanical features, species, varieties and commercial importance. It explains environmental requirements, soil conditions, propagation, planting, irrigation, nutrient management and cultural operations. The chapter also addresses pests, diseases, harvesting, grading and postharvest handling. Because of its unique appearance and suitability for floral arrangements, Bird of Paradise has significant potential in premium floriculture markets. The chapter provides practical production guidance for growers seeking to develop high-value tropical cut flower enterprises. commercially and sustainably.

Boron (B) de?ciency has been realized as the second most important micronutrient constraint in crop production after that of Zn in the world (Ahmed et al., 2012). However, in Nepal, B de?ciency is more wide-spread than Zn de?ciency, as 80 to 90% of soil samples were de?cient in B, 20 to 50% in Zn and 10 to 15% in Mo (Anderson, 2007). In India, B de?ciency has increased from 2% of the soil samples de?cient in B in 1980s (Katyal and Vlek, 1995) to 52% soil samples in 2000s (Singh, 2012). Total B content in Indian soils varies from 7 to 630 mg kg^–1 soil (Kanwar, 1976); being the highest in arid regions of the country and the lowest in wet humid regions of the country (Behera et al., 2009; Prasad et al., 2014). Boron de?ciency is most in the heavy rainfall areas of Western Ghats of Maharashtra, Karnataka and the eastern states of Bihar, Odisha, Jharkhand and Chhattisgarh states of India (Fig.13.1). The wide-spread de?ciency of B in India can be seen from the fact that B fertilization recorded the highest bene?t : cost (B : C) ratio in rice–wheat cropping system at Palampur (Himachal Pradesh), Ludhiana (Punjab), Faizabad, Modipuram and Varanasi (Uttar Pradesh), Pantnagar (Uttarakhand) and in rice–rice cropping system at Maruteru (Andhra Pradesh), Karjat (Maharashtra) and Jorhat (Asom) (Singh and Goswami, 2014). Response of wheat to B fertilization is also reported from Bangladesh (Halder et al, 2007).

Object: Breaking of seed dormancy to facilitate germination.

Material required: Seeds, water, sharp needle, sharp razor, sandpaper, acids, Potassium nitrate and gibberellic acid. 

Definition: Inability of a viable seed to respond the favorable environmental conditions for germination is known as dormancy.

Introduction

Man’s intervention in the evolution of plants, to adapt them to suit his needs, constitutes the practice of plant breeding. Historically regarded as an art and still too empirical to be accepted universally as a science, it has recently been described as a technology (Riley 1978). Whether art, science or technology, it certainly draws on a wide range of disciplines and embodies all those principles of organisation and management that determine success in any production-oriented programme.

Perhaps the biggest contribution that the plant breeder has made to increased production during the past 50 years has been in helping to alleviate the effects of natural hazards such as lodging, pests and diseases on crop production. While most of this progress has been through the manipulation of biotic stresses, much is still to be achieved under non-biotic stresses such as drought, salinity, temperature, etc. This argument is strengthened by the fact that in spite of the spectacular achievements made possible by the ‘Green Revolution’, the productivity level of most crop plants, including wheat and rice, has remained both low and static under stress conditions. Concerted efforts are needed through an approach of interdisciplinary research, since not much has been done to define criteria for stress assessment and evolving breeding approaches for incorporating stress tolerance in crop plants.

Expression of genetic potential for growth and yield of a crop variety is directly dependent upon the environment comprising both climate (weather) and soil components. As discussed in the preceding chapter, the term ‘salt-affected soils’ encompasses a broad group of adverse but distinct soil conditions, namely, saline, alkali (sodic) and acid soils with further variations such as coastal and inland locations as well as arid and water-logged situations (Swaminathan 1977; Bresler et al. 1982). Factors limiting growth and yield of crop plants in various categories of problem soils are different and specific. Likewise, adaptive strategies evolved by plants to cope with the prevailing edaphic stresses, such as salt stress, also vary a great deal as indicated in Table 1. It is not unexpected therefore, that even varieties within a crop often show notable differences regarding tolerance to adverse soil conditions (Epstein et al. 1980; Devine 1982; Shannon 1984; Sayed 1985). Hence, it is essential that the breeder must understand the inherent charaderistics of the problem soil with which he is concerned and should also simultaneously appreciate that basically it is the sensitivity of crop variety, rather than the soil parameters per se, that essentially determines the occurrence as well as the magnitude of actual soil problem (Rana 1977). Since the degree of tolerance (adaptation) of crop varieties to different kinds of salt affected soils is genetically controlled, it is axiomatic that it can be improved through genetic manipulations by adopting suitable breeding procedures.