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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: Plant Breeding × End date: 2021 × Start date: 2021 × Type: Thesis × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    FUNCTIONAL ANALYSIS OF NUTRACEUTICAL PROPERTIES FOR DIFFERENT TYPES OF RICE
    (AAU, Jorhat, 2021) Gogoi, Smrita; Dutta Deka, Sharmila
    Traditional rice genotypes are endowed naturally with a wide range of nutraceutical properties and thus constitutes to be a potential functional food for nutritional security. The present investigation was undertaken with the objectives to study the diversity of different rice genotypes for yield and yield attributes with varying nutritional components especially iron and zinc. The differential expression of the genes for anthocyanin biosynthesis in relation to iron and zinc content in rice grain and genome wide association study to identify significant marker trait associations for yield and grain quality in rice germplasm collection was also done in the present study. A group of 204 rice genotypes comprising of traditional rice including ahu, Sali, bao, aromatic and glutinous genotypes along with a few high yielding released varieties and high zinc breeding lines developed in IRRI, Philippines were evaluated during Sali 2019-20 in augmented block design and observations were taken for quantitative and qualitative traits as per DUS guideline including important phytochemicals using standard procedure. Out of these, Disang and Dimrou, were recorded as earliest flowering and maturing genotypes, whereas Gopinath and Horu Jahinga possess more number of productive tiller per plant. Joha (Meghalaya) was recorded for high spikelet fertility, whereas Horu Jahinga, Jengoni, and Kajoli chokuwa were recorded high seed yield per plant. To authenticate the common perception of high nutritional value of traditional pigmented rice genotypes, phytochemical analysis were done for 30 genotypes which were selected based on high Fe, Zn content and aleurone colour. Pigmented rice genotypes; Tulashi bora, Ikhojoy, Aus joria and Jengoni were recorded high phytochemical content along with higher Fe and Zn. Jengoni was also recorded high grain yield per plant along with biological yield per plant. Hence, Jengoni along with Tulashi bora, Ikhojoy and Aus joria are identified as promising genotypes for future nutritional breeding combining with good yield. A high significant correlation was also observed between total phenolics and antioxidant activity with total anthocyanin activity. For expression analysis, 5 genotypes were selected including one check i.e. Bahadur, on the basis of high Fe and Zn content and aleurone colour. Seven gene specific primers were designed to study the expression profile in selected genotypes by double delta CT method. The results indicated that there is no direct relationship between anthocyanin and micronutrient content and thus warrants possibility of involvement of different genes other than the tested ones. Genotyping by 6 sequencing using SNP marker was done for the present set of 204 diverse rice germplasm by outsourcing and marker and trait associations for yield and grain quality in rice germplasm collection for 20 traits was investigated. Out of the 20 traits and 75,309 SNPs analyzed, 30 SNPs showed significant associations with plant height, stem length, spikelet fertility and 1000-grain weight and Zn content. Among the 30 SNPs only 18 SNPs were encoded and co-located with major candidate genes. Moreover, for spikelet fertility and 1000-grain weight, four novel QTLs were detected, which were mapped on chromosome 5 and 7 at 12336034bp and 9597295bp position, respectively for spikelet fertility and on chromosome 7 and 12 at position 13808132bp and 6012015bp for 1000-grain weight. Further characterization and validation of the novel QTLs may lead to the identification of new candidate genes for these traits.