Department Of Botany

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Author: search.filters.author.Choudhary, Krishna KumarHas files: Yes

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    PGPR Bioelicitors: Induced Systemic Resistance (ISR) and Proteomic Perspective on Biocontrol
    (Elsevier, 2019) Kannojia, Pooja; Choudhary, Krishna Kumar; Srivastava, Akhileswar Kumar; Singh, Amit Kishore
    Control of plant disease is primarily reliable on the indiscriminant use of chemical pesticides including the bactericides, fungicides, and insecticides that are harmful for plant pathogens, or plant disease vectors. However, negative effect of these chemicals and their degradation products may pose hazardous effect to the environment and human beings that paved the researchers and growers for exploring the new and eco-friendly mode of disease control. To date, use of alternative methods such as, plant growth promoting rhizobacteria (PGPR) as biological control agents, have been found effective and are being increasingly applied in the field. PGPR directly and indirectly enhances the plant growth and reduces the disease development in plant system by various mechanisms that include: Production of antimicrobial metabolites, volatile compounds, induced systemic resistance (ISR), etc. These defense mechanisms can cause substantial changes in the plants structural and functional changes that lead to pathogen resistance. Present review describes the biocontrol mechanism and proteomic perspective of PGPR elicitors in plant disease management.
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    Reactive Oxygen Species: Generation, Damage, and Quenching in Plants During Stress
    (John Wiley & Sons Ltd, 2018) Choudhary, Krishna Kumar; Chaudhary, Nivedita; Agrawal, S B; Agrawal, M
    Reactive oxygen species (ROS) are reactive molecules formed during the normal metabolism of plants such as superoxide radical, hydrogen peroxide, hydroxyl radicals and singlet oxygen. They function as important signalling molecules in the regulation of several plant processes like growth, development and physiology. Excessive formation of ROS in plants has been reported under various biotic and abiotic stresses causing lipid peroxidation, disturbance in various biotic process, alterations in genetic material and degradation of proteins. Higher generation of ROS causes oxidative stress depending upon quenching of the plants. For efficient scavenging of ROS, plants are well equipped with several enzymatic (superoxide dismutase, catalase, glutathione reductase, glutathione peroxidase, ascorbate peroxidase, monodehydroascorbate reductase, dehydroascorbate reductase, guaiacol peroxidase and glutathione‐S‐transferase etc.) and nonenzymatic (ascorbic acid, flavonoids, phenols, carotenoids, β‐carotene, proline and ά‐tocopherols etc.) antioxidants. In the present chapter, generation of ROS under various stresses, production sites of ROS in plants, damaging effects as well as their role as a signalling molecule and their scavenging in plants through various mechanisms will be discussed.