Stimulation of Mutation by Gamma Irradiation in Mulberry (Morus) Genotype S54 | Chapter 12 | Advances and Trends in Agricultural Sciences Vol. 3

Abundant mulberry genotypes are accessible in nature, they are deficient in one or the other important economic trait required for silkworm Bombyx mori L. as mulberry leaf is the sole food. In the present experiment, as S54 mulberry genotype leaves are very much suited for rearing young age (Chawki) silkworms, an effort has been made to induce phytomorphological variability in S54 mulberry genotype using gamma rays. RBD Method with three replications / treatment was followed. Experiment was performed in Mulberry garden, Department of Sericulture, Jnana Bharathi Campus, Bangalore University and Mist chamber, Indian Institute of Horticultural Research (IIHR), Bangalore, Karnataka, India. Gamma ray (1kR-10Kr) was used to induce variability in juvenile twigs of mulberry for various agro-botanical characters viz., sprouting, rooting, internodal distance, leaf area, plant height etc. and leaves were exposed to biochemical analysis. Mulberry genotype S54 showed linear decrease in growth parameters with the increased gamma ray dosage and plants exhibited variability with increased rooting (81.33%), plant height (147.86 cm) and leaf area (146.22 cm2) when compared to control in M1 generation at 7kR. Mutants displaying encouraging characters were grown for M2 generation which exhibited marked enhancement in growth and yield parameters. Biochemical constituents in S54 mutant leaves recorded at 7kR revealed increased proteins, carbohydrate, chlorophyll a and b. Mulberry cuttings irradiated with gamma ray (7kR) exhibited favorable characters in rooting, plant height and leaf area over the control in M1 generation and mutants were grown for M2 generation and marked improvement in growth, yield and bio-chemical parameters were witnessed.

Author(s) Details

Dr. H. L. Ramesh
Department of Sericulture, V. V. Pura College of Science, K. R. Road, Bangalore-560004, Karnataka, India.

Dr. V. N. Yogananda Murthy
Department of Biotechnology, Azyme Biosciences Private Limited, Jayanagar, Bengaluru-560069, Karnataka, India.

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Adoption of Bio and Organic Amendments: A New Perspective in Crop Protection | Chapter 03 | Advances and Trends in Agricultural Sciences Vol. 3

Crop loss due to pest attack occurs regardless of the fact that a large quantity of pesticides is used annually. Use of chemical pesticides not only destroy the beneficial enemies but also alter the physiology of crop making more susceptible to pest attack. This chapter focuses on the scope and strategies of crop protection using bio-organic amendments with special reference to infestation of major pests, foliar disease and leaf productivity of mulberry. Massive utilization of inorganic fertilizers for a prolonged period leads to alteration of the soil chemical properties, the availability and uptake of nutrients by the plants. Several studies found that under water stress conditions, crops in organic agriculture systems produce significantly higher yields than comparable with other conventional crops using inorganic package and practices. Researchers have established that increase nitrogen levels in the tissues of the plants may decrease resistance and increase susceptibility to pest attacks. Although clarity is needed to establish the relationship between crop nutrition and pests, most studies have shown that insect pests like aphids and mites are more prone to nitrogen fertilizers. With relevant to above fact adoption of organic package and practices is needed for sustainable yield of crops as well as to provide exact nutrient requirements to the crop those prone to pest attack.

Author(s) Details

Barna Chakraborty
Department of Zoology, DDE, Vidyasagar University, Midnapore-721102, India.

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