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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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Subject: Plant Pathology × Author: Boruah, Sarodee × End date: 2018 × Type: Thesis ×
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    ThesisItemOpen Access
    DEVELOPMENT OF NEXT-GEN NANO-BIO FORMULATION OF Trichoderma FOR SEED TREATMENT OF VEGETABLE CROPS
    (AAU, Jorhat, 2018-01) Boruah, Sarodee; Dutta, Pranab
    Trichoderma is a potential antagonistic biological control agent for the management of soil borne and aerial plant pathogens. Trichoderma based bioformulations has been developed by different scientists throughout the world with effective field results. Chitosan nanoparticles have various applications due to its biodegradable and non- toxic properties. It can elicit natural innate defense responses within the plant system to resist plant diseases. Trichoderma spp. can be stimulated for production of chitinase by addition of nano chitosan in its bioformulation. In the present study, chitosan nanoparticles were synthesized from four different fungus viz., Fusarium oxysporum, Metarhizium anisopliae, Beauveria bassiana and Trichoderma viride and one commercial product of chitosan (Sigma Aldrich) was taken for comparison. Synthesized nanoparticles were characterized by using UV-VIS Spectroscopy, Fourier transform infrared spectrometer (FTIR), Zetasizer, Dynamic Light Scattering (DLS) and Transmission Electron Microscopy (TEM). Formation of chitosan nanoparticles (NPs) were confirmed by UV-VIS spectroscopy study with absorption peaks at the range of 310.02 to 342.00 nm. FTIR study showed that synthesized chitosan NP has all the required functional groups like OH, N-H, C-H, C=O, C-O, C-N and P=O. Study on surface properties of NPs by using zetasizer resulted that chitosan NPs synthesized from F. oxysporum, M. anisopliae, B. bassiana, T. viride and commercial product were found to be positively charged and were stable in nature with zeta potential of 3.24, 18.6, 5.4, 9.78 and 17.6 mV respectively. Electron microscopy study showed that the shape of NP as nearly spherical. DLS analysis showed the average size of the chitosan NPs synthesized from F. oxysporum, M. anisopliae, B. bassiana, T. viride and commercial products as 273.20, 172.50, 78.36, 89.03 and 300.10 nm respectively. Compatibility with T. asperellum study showed that nano chitosan at all the tested concentrations (@ 0.01, 0.02 and 0.03 per cent) were compatible. Study on in vitro efficacy against three soil borne plant pathogens viz., Fusarium oxysporum, Sclerotium rolfsii and Rhizoctonia solani showed that the combination of T. asperellum and chitosan NP was superior in inhibiting the mycelial growth of the tested pathogens as compared to the recommended chemical @0.1 per cent. Nanochitosan based liquid formulation of T. asperellum was prepared and energy dispersive X- ray spectroscopy (EDX) study showed the presence of the required elements with per cent atomic weights. Further, study on in vitro bioefficacy of the nanobioformulation showed highly effective result with highest radial growth inhibition percentage of 62.07, 47.85 and 63.25 per cent against F. oxysporum, S. rolfsii and R. solani respectively. Seeds treated with nanobioformulation @ 0.3 per cent could protect the crops upto 47.02, 50.00 and 60.00 per cent at 50 days after sowing in pea, tomato and cabbage respectively over control with significant increase in growth as well as physiological parameters.