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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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20211
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Subject: Entomology × Author: Hussain, Nasreen × Start date: 2020 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    MORPHOLOGICAL AND BIOCHEMICAL BASES OF RESISTANCE OF CERTAIN CHILLI GERMPLASMS AGAINST YELLOW MITE, Polyphagotarsonemus latus (BANKS)
    (AAU, Jorhat, 2021) Hussain, Nasreen; Rahman, Sahidur
    The present experiment was carried out to investigate the morphological and biochemical bases of resistance of certain chilli germplasms against yellow mite. The experiment was conducted at Instructional-Cum-Research (ICR) Farm and Department of Entomology, Assam Agricultural University, Jorhat during 2020-21. The seasonal incidence of yellow mite of chilli was assessed on weekly basis from February, 2021 to May, 2021. Activity of yellow mite was observed from second week of February. The mean mite population was highest during last week of March, 2021 with 23.70 number of mites per 3 leaves and the least was found as 0.10 mites per 3 leaves during first week of May, 2021. The mean mite population showed significant negative correlation with evening relative humidity (r = 0.525) and rainfall (r = 0.501) whereas significant positive correlation (r = was shown with maximum temperature Based on mean mite population, germplasms were categorized as, highly resistant (Moni, Yellow mem, Green mem, Krishna with <5 mites per 3 leaves), moderately resistant (Purple, Diphu with 10-20 mites per 3 leaves), susceptible (Jati tez, Jati suti with 20-30 mites per 3 leaves) and highly susceptible (Bhekuri, Khorika, Birds’s eye, Bhut jolokia with >30 mites per 3 leaves). The correlation studies between the population of the yellow mite and different morphological and biochemical characters revealed that yellow mite had a significant negative correlation with trichome density (r = -0.847), while leaf area had significant positive correlation (r = 0.651). Among the biochemical parameters taken, total soluble sugar (r = 0.945) and total soluble protein (r = 0.804) had positive significant correlations with mite infestation and total phenolic compounds had significant negative correlation (r = -0.668). Therefore, resistant germplasms had greater trichome density and higher phenolic compounds in leaves which confer red resistance against yellow mite. Thus, the desirable characteristics may be incorporated for development of resistant varieties through breeding.