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Assam Agricultural University, Jorhat

Assam Agricultural University is the first institution of its kind in the whole of North-Eastern Region of India. The main goal of this institution is to produce globally competitive human resources in farm sectorand to carry out research in both conventional and frontier areas for production optimization as well as to disseminate the generated technologies as public good for benefitting the food growers/produces and traders involved in the sector while emphasizing on sustainability, equity and overall food security at household level. Genesis of AAU - The embryo of the agricultural research in the state of Assam was formed as early as 1897 with the establishment of the Upper Shillong Experimental Farm (now in Meghalaya) just after about a decade of creation of the agricultural department in 1882. However, the seeds of agricultural research in today’s Assam were sown in the dawn of the twentieth century with the establishment of two Rice Experimental Stations, one at Karimganj in Barak valley in 1913 and the other at Titabor in Brahmaputra valley in 1923. Subsequent to these research stations, a number of research stations were established to conduct research on important crops, more specifically, jute, pulses, oilseeds etc. The Assam Agricultural University was established on April 1, 1969 under The Assam Agricultural University Act, 1968’ with the mandate of imparting farm education, conduct research in agriculture and allied sciences and to effectively disseminate technologies so generated. Before establishment of the University, there were altogether 17 research schemes/projects in the state under the Department of Agriculture. By July 1973, all the research projects and 10 experimental farms were transferred by the Government of Assam to the AAU which already inherited the College of Agriculture and its farm at Barbheta, Jorhat and College of Veterinary Sciences at Khanapara, Guwahati. Subsequently, College of Community Science at Jorhat (1969), College of Fisheries at Raha (1988), Biswanath College of Agriculture at Biswanath Chariali (1988) and Lakhimpur College of Veterinary Science at Joyhing, North Lakhimpur (1988) were established. Presently, the University has three more colleges under its jurisdiction, viz., Sarat Chandra Singha College of Agriculture, Chapar, College of Horticulture, Nalbari & College of Sericulture, Titabar. Similarly, few more regional research stations at Shillongani, Diphu, Gossaigaon, Lakhimpur; and commodity research stations at Kahikuchi, Buralikson, Tinsukia, Kharua, Burnihat and Mandira were added to generate location and crop specific agricultural production packages.

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  • ThesisItemOpen Access
    STUDIES ON GENETIC VARIATION FOR PESTICIDE INDUCED CHROMOSOMAL ABERRATIONS IN ONION (Allium cepa L.)
    (2021) Chakrabarty, Ritika; Barua, Purna K.
    Pesticides have been in use in agriculture since decades for crop protection and production. Farmers use chemical insecticides, fungicides and herbicides to control insect pests, diseases and weeds. Extensive use of chemical pesticides is becoming hazardous to the environment and human and animal health. Biopesticides have been used as a safer alternative. However, it is also important to know the merits and demerits of using biopesticides in the long run. In this investigation the effects of a chemical systemic insecticide ‘Actara 25WG’ and a bioinsecticide ‘Bio Sona’ were assessed for seed germination and seedling growth, and on their effect on root mitosis in five varieties of onion. Experiments were conducted in pots under polyhouse for seedling growth and in the laboratory for germination and cytogenetic study. Three concentrations of Actara 25WG viz., @ 25 g/kg seed, 50 g/kg seed (recommended dose) and 75 g/kg seed were used for seed treatment and @ 200g/ha; 400g/ha (recommended dose) and 600 g/ha for soil application. Bio Sona was applied as soil and seed treatment @ 2%; 5% (recommended dose) and 8%. Negative effects of the two pesticides were observed on seed germination except for Bio Sona at 2% concentration in the variety Bhima Shakti. Actara 25WG and Bio Sona were found to have stimulatory as well as inhibitory effects on seedling height, seedling leaf length, seedling leaf diameter, number of leaves per seedling, root length of seedling, seedling fresh and dry weight depending on the pesticide, concentration and genotype of onion. Each variety showed different level of sensitivity towards the pesticides. Cytogenetic analysis revealed that mitotic index was either promoted or depressed depending on the concentrations of the pesticides and the variety. These pesticides also induced genotoxic effects on root tip cells by showing chromosomal aberrations like binucleate cells, clumps, stickiness, disturbed stage, laggards, bridges and fragments. Bio Sona showed more aberrations than Actara 25WG. There was differential response of the varieties to the pesticide treatment. High heritability, genotypic variation and genetic advance were observed for seedling dry weight and mitotic index.