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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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20221
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Subject: Plant Pathology × Author: Khaba, Chingakham Inao × End date: 2022 × Start date: 2022 × Type: Thesis × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Molecular epidemiology of viral disease complex of Capsicum chinense Jacq. in North Eastern Region of India
    (2022) Khaba, Chingakham Inao; Nath, P. D.
    Viral disease complex of Capsicum chinense Jacq. were the major constraint facing by king chilli growers in North Eastern Region (NER) of India in recent decades. A total of 94 samples were collected from Assam (36), Arunachal Pradesh (12), Nagaland (10), Meghalaya (8) and Manipur (28). Both DNA & RNA were isolated and detected CMV, PVY, ChiLCV & GBNV. Peculiar symptoms of shoestring, vein banding, leaf puckering, leaf curl and leaf necrosis were observed. Moreover, unknown mix viral infection symptom like yellowing, stunted growth were also observed. Severe symptoms as well as highest vectors population were observed in Assam and lowest in Meghalaya. After PCR base detection, CMV has the highest per cent infection in NER of India (47.88%) followed by PVY (8.58%), ChiLCV (8.34%) and GBNV (4.55%). CMV was detected from all the five states of north east India. The highest disease incidence of CMV was observed in Manipur (53.57%) and lowest in Meghalaya (37.50%). PVY was detected from Assam and Manipur with an incidence of 26.31 and 16.66% respectively. ChiLCV and GBNV were detected from Assam only with an incidence of 26.31 and 16.66% respectively. With respect to altitude, CMV was more prevalent at the mid-altitude (200-800 m a.s.l.) with 54% and followed by low altitude (<200 m a.s.l.) with 48%. The lowest CMV prevalent was at the high altitude (>800 m a.s.l.) with 47%. Whitefly prevalence depending on altitude; at low altitudes (0–200 m), 35% of the plants sampled were colonized by more than five whiteflies and 38% of the plants no whiteflies were detected. Although 49% of the plants sampled at mid-altitude (200–800 m) were not colonized, 33% were colonized by one to five whiteflies, and the remaining 17% by more than five. At high altitudes (>800 m a.s.l), no whiteflies were detected on 92% of the plants. Those mix viral infection of king chilli leaves was done Next Generation Sequencing (NGS) in Illumina platform. A data of 3.75 GB was generated in which 66.2% of chilli genome were mapped. The unmapped read data was 1.4 GB. After Denovo assembly, 51.9 Mb was generated and subjected to BLAST in NCBI. A total of 27 different isolates of king chilly viruses were revealed and 6 viruses were novel in NER of India viz., Pepper cryptic virus, Pepper vein yellows virus, Tomato ringspot virus, Capsicum frutescens endornavirus, Alphaendorna virus and Pepper leafroll virus . The highest occurrence virus was pepper vein yellow virus (10/27) and followed by Pepper cryptic virus (6/27), Capsicum frutescens endornavirus (4/27) and Chilli veinal mottle virus (3/27) respectively. The single occurrence viruses were Tomato ringspot virusT , Potato virus Y, , Pepper leafroll virus and Alphaendorna virus . All the NGS viruses were ranged 87-100 % homology to NCBI database.