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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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20193
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Author: Luikham, Star ×
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    ThesisItemOpen Access
    MOLECULAR CHARACTERIZATION OF AROID GERMPLASMS OF NORTH EAST INDIA – ASSESSMENT OF HOST RESISTANCE AND BIOLOGICAL MANAGEMENT OF BACTERIAL BLIGHT DISEASE
    (2019) Luikham, Star; Bora, L. C.
    Bacterial blight disease of Taro incited byXanthomonasaxonopodispv. dieffenbachia (Xad) is a quarantine importance causing extensive damage and loss to the crop in recent decades. The present study was attempted to collect, conserve and characterize the aroid cultivars/ germplasms of North East (NE) India based on 29 RAPD markers, to find out the resistant cultivars/ germplasms amongst them and also in controlling the disease through microbial based biopesticides. 64 Taro cultivars/ germplasm collected from different regions of NE along with two national released varieties,viz.,‘Muktakeshi’ and ‘SreeKiran’ as check varieties were grouped into two main clusters based on RAPD markers.Colony and morphological studies, biochemical and pathogenicity test, Field emission scanning electron microscope (FESEM)and molecular studies confirmed that the pathogen isolated from infected plant parts of colocasia was Xadwhich was short rod-shaped.Screening of the various cultivars/ germplasms against Xadin actual field condition was performed based on the disease severity and disease rating scaleand revealed that the number of resistant, moderately resistant, moderately susceptible and susceptible cultivars were 4, 21, 26 and 15 respectively, while none of the germplasms were immune and highly susceptible to the disease.Disease severity per cent ranged from 14.17 % (Nepali-2) – 67.50 % (SC-1).In vitro studies of the various bioagent combinations for four bio-formulations (Biofor-pf, Bio-time, Biogreen-5, Biozin-PTB) along with streptocycline@100 ppm as chemical check were evaluated against Xad. Highest per cent inhibition (66.22 %) was observed for the combination of five bio-agents, viz., Trichodermaviride, Beauveriabassiana, Metarhiziumanisopliae, Pseudomonas fluorescensandBacillus thuringiensis. Two moderately susceptible germplasms, i.e. ‘Pijayikochu’ and ‘SC-1’ were selected and the four bio-formulations along with streptocycline@100 ppm were evaluated for their efficacy against Xadunder pot condition, by applying these as corm treatment, soil application and foliar spray. Highest disease reduction for ‘Piyajikochu’ (71.42 %) and ‘SC-1’(72.69 %) as well asyield and yield attributing characters were recorded for the bioformulation Biogreen-5 comprising of the five bio-agents while the highest corm and cormels yield (g/plant) recorded were 1194.47 (Pijayikochu) and 1039.06 (SC-1). The present study seems to be the first report for screening of different Taro cultivars/ germplasm against bacterial blight of colocasia under field condition. Exploration of different microbe based biopesticides also seems to be the first report of investigation for controlling the disease.
  • Thumbnail Image
    ThesisItemOpen Access
    MOLECULAR CHARACTERIZATION OF AROID GERMPLASMS OF NORTH EAST INDIA – ASSESSMENT OF HOST RESISTANCE AND BIOLOGICAL MANAGEMENT OF BACTERIAL BLIGHT DISEASE
    (AAU, Jorhat, 2019) Luikham, Star; Bora, L. C.
    Bacterial blight disease of Taro incited by Xanthomonas axonopodis pv. dieffenbachia (Xad) is a quarantine importance causing extensive damage and loss to the crop in recent decades. The present study was attempted to collect, conserve and characterize the aroid cultivars/ germplasms of North East (NE) India based on 29 RAPD markers, to find out the resistant cultivars/ germplasms amongst them and also in controlling the disease through microbial based biopesticides. 64 Taro cultivars/ germplasm collected from different regions of NE along with two national released varieties, viz., ‘Muktakeshi’ and ‘Sree Kiran’ as check varieties were grouped into two main clusters based on RAPD markers. Colony and morphological studies, biochemical and pathogenicity test, Field emission scanning electron microscope (FESEM) and molecular studies confirmed that the pathogen isolated from infected plant parts of colocasia was Xad which was short rod-shaped. Screening of the various cultivars/ germplasms against Xad in actual field condition was performed based on the disease severity and disease rating scale and revealed that the number of resistant, moderately resistant, moderately susceptible and susceptible cultivars were 4, 21, 26 and 15 respectively, while none of the germplasms were immune and highly susceptible to the disease. Disease severity per cent ranged from 14.17 % (Nepali-2) – 67.50 % (SC-1). In vitro studies of the various bioagent combinations for four bio-formulations (Biofor-pf, Bio-time, Biogreen-5, Biozin-PTB) along with streptocycline@100 ppm as chemical check were evaluated against Xad. Highest per cent inhibition (66.22 %) was observed for the combination of five bio-agents, viz., Trichoderma viride, Beauveria bassiana, Metarhizium anisopliae, Pseudomonas fluorescens and Bacillus thuringiensis. Two moderately susceptible germplasms, i.e. ‘Pijayi kochu’ and ‘SC-1’ were selected and the four bio-formulations along with streptocycline @100 ppm were evaluated for their efficacy against Xad under pot condition, by applying these as corm treatment, soil application and foliar spray. Highest disease reduction for ‘Piyaji kochu’ (71.42 %) and ‘SC-1’(72.69 %) as well as yield and yield attributing characters were recorded for the bioformulation Biogreen-5 comprising of the five bio-agents while the highest corm and cormels yield (g/plant) recorded were 1194.47 (Pijayi kochu) and 1039.06 (SC-1). The present study seems to be the first report for screening of different Taro cultivars/ germplasm against bacterial blight of colocasia under field condition. Exploration of different microbe based biopesticides also seems to be the first report of investigation for controlling the disease.
  • Thumbnail Image
    ThesisItemOpen Access
    MOLECULAR CHARACTERIZATION OF AROID GERMPLASMS OF NORTH EAST INDIA – ASSESSMENT OF HOST RESISTANCE AND BIOLOGICAL MANAGEMENT OF BACTERIAL BLIGHT DISEASE
    (AAU, Jorhat, 2019) Luikham, Star; Bora, L. C.
    Bacterial blight disease of Taro incited by Xanthomonas axonopodis pv. dieffenbachia (Xad) is a quarantine importance causing extensive damage and loss to the crop in recent decades. The present study was attempted to collect, conserve and characterize the aroid cultivars/ germplasms of North East (NE) India based on 29 RAPD markers, to find out the resistant cultivars/ germplasms amongst them and also in controlling the disease through microbial based biopesticides. 64 Taro cultivars/ germplasm collected from different regions of NE along with two national released varieties, viz., ‘Muktakeshi’ and ‘Sree Kiran’ as check varieties were grouped into two main clusters based on RAPD markers. Colony and morphological studies, biochemical and pathogenicity test, Field emission scanning electron microscope (FESEM) and molecular studies confirmed that the pathogen isolated from infected plant parts of colocasia was Xad which was short rod-shaped. Screening of the various cultivars/ germplasms against Xad in actual field condition was performed based on the disease severity and disease rating scale and revealed that the number of resistant, moderately resistant, moderately susceptible and susceptible cultivars were 4, 21, 26 and 15 respectively, while none of the germplasms were immune and highly susceptible to the disease. Disease severity per cent ranged from 14.17 % (Nepali-2) – 67.50 % (SC-1). In vitro studies of the various bioagent combinations for four bio-formulations (Biofor-pf, Bio-time, Biogreen-5, Biozin-PTB) along with streptocycline@100 ppm as chemical check were evaluated against Xad. Highest per cent inhibition (66.22 %) was observed for the combination of five bio-agents, viz., Trichoderma viride, Beauveria bassiana, Metarhizium anisopliae, Pseudomonas fluorescens and Bacillus thuringiensis. Two moderately susceptible germplasms, i.e. ‘Pijayi kochu’ and ‘SC-1’ were selected and the four bio-formulations along with streptocycline @100 ppm were evaluated for their efficacy against Xad under pot condition, by applying these as corm treatment, soil application and foliar spray. Highest disease reduction for ‘Piyaji kochu’ (71.42 %) and ‘SC-1’(72.69 %) as well as yield and yield attributing characters were recorded for the bioformulation Biogreen-5 comprising of the five bio-agents while the highest corm and cormels yield (g/plant) recorded were 1194.47 (Pijayi kochu) and 1039.06 (SC-1). The present study seems to be the first report for screening of different Taro cultivars/ germplasm against bacterial blight of colocasia under field condition. Exploration of different microbe based biopesticides also seems to be the first report of investigation for controlling the disease.