Thumbnail Image

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.

Browse

20221
Reset filters
Subject: Plant Pathology × Author: Phookan, Jutimala × End date: 2022 × Start date: 2022 × Type: Thesis ×
Reset filters

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    ThesisItemOpen Access
    Elimination of the Potato Viruses from the Local Landraces through in Vitro Culture
    (2022) Phookan, Jutimala; Kalita, Manoj Kumar
    The present investigation on local landraces of potatoes from Assam was conducted to eliminate the viral infections. For this the local landraces were collected from different districts of Assam viz., Jorhat, Biswanath, Sonitpur, Barpeta, Dibrugarh and Kokrajhar. Different symptoms like puckering of leaves, cupping of leaves, leaf rolling, purple colouration on leaves, calico pattern, mosaic symptoms, crinkling of leaves, etc. were observed. It was observed that the landrace from Barpeta had the highest disease incidence of 62.22 per cent and the lowest incidence of 10.00 per cent was observed in Badami aloo collected from Kokrajhar. PCR analysis of the symptomatic samples showed the presence of different viruses like PVY, PLRV, PVM, PVX, PVS and AMV. The potato tubers were also subjected to PCR analysis and only PLRV was detected with the highest incidence in Barpeta landrace (75.00 %). The growth and yield attributing characters of the landraces collected were also recorded. Plant height was observed to be highest in the landrace of Dibrugarh with 43.36 cm. The highest number of branches was observed in Dibrugarh landrace. The weight of tubers per plant was observed to be highest in case of Dibrugarh landrace (383.48 g). In the in vitro studies, three types of explants (nodal segment, tuber eyes and apical meristem) with two types of media (MS and PM media) were used to conduct the experiment. Among the various hormonal combinations used for shooting, the best hormonal combination observed was 2 mg/ l GA3 + 4mg/ l NAA + 2 mg/ l BAP irrespective of the explant and media used in case of the parameters viz., time required for shooting, number of shoots developed and length of shoots. Similarly in case of rooting the best hormonal combination observed was 1.5 mg/ l IAA + 1.5 mg/ l GA3 + 1.5 mg/ l KIN irrespective of the explant and media used in case of the parameters viz., time required for rooting, number of roots developed and length of roots. The potato plantlets survived highest (86.67 %) when grown from tuber eyes whereas the disease incidence of PLRV was lowest (20.00 %) in case of plantlets grown from apical meristem. Further SAR chemicals were applied exogenously in the potato plants grown in field condition and it was observed that BTH applied at 1.5 mM had the highest reduction of incidence over control (87.03 %). The results of application of SAR chemicals were also supported by the biochemical analysis of DAB assay and PPO assay. On application of thermotherapy, no disease incidence was observed at 40 ⁰C for 2 hours 30 minutes where germination was 50 per cent.