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ThesisItem Open Access MORPHOLOGICAL AND BIOCHEMICAL CHARACTERIZATION OF BHUT JOLOKIA (Capsicum chinense Jacq.)(AAU, Jorhat, 2015) Sentimenla; Narzary, B. D.An experiment was conducted during the year 2012-13 and 2013-14 in the Experimental Farm, Department of Horticulture, College of Agriculture, Assam Agricultural University, Jorhat on eleven Bhut jolokia (Capsicum chinense Jacq.) genotypes for morphological and biochemical characterization. Observations were recorded for morphologic traits, growth characters, yield and yield attributing traits, biochemical characters and colour parameters. Characterization of the genotypes was done based on 11 morphological characters following the descriptors developed by the International Plant Genetic Resources Institute for the genus Capsicum, IPGRI (1995).The genotypes were characterized by the 11 morphological characters, of which only 4 characters showed polymorphism. Significant variation was revealed among the genotypes for all the growth and yield and yield attributing characters except for 1000 seed weight. The highest fruit yield per plant with the highest number of flowers per cluster, minimum days to emergence of flower bud, highest number of fruits per plant and maximum days to harvest maturity was produced by G9 compared to other genotypes. Among the other genotypes G1, G6 and G10 were found promising for fruit yield. All the genotypes showed significant variation with regard to the biochemical characters except moisture content. Genotypes G1 showed the highest content for potassium, iron, capsaicin, moisture and DPPH scavenging activity. It was observed that the crude protein, beta-carotene and oleoresin content were highest in G3 compared to the other genotypes. G6 gave the highest value for ascorbic acid and phosphorus content compared to the other genotypes under study. From the colour value estimation it was found that genotype G3 exhibited the highest ‘L’ and ‘a’ value while G4 showed the highest value for ‘b’ and hue compared to the other genotypes and the highest value for Chroma was recorded in G9. From the study of genetic parameters in this population of genotypes, it was observed that fruit yield per plant showed the highest genotypic variation, heritability and genetic advance. The other characters found to be effective selection criteria were plant height, number of leaves per plant, number of fruits per plant and number of seeds per fruit. From Path analysis it was found that the number of primary branches and fruit width exerted positive direct effects and were positively correlated with fruit yield per plant. Thus by considering both genetic parameters and character relationships number of leaves per plant, days to emergence of flower bud, fruit width, number of primary branches per plant, number of fruit per plant and harvest duration could be further exploited for crop improvement to develop suitable plant type. Thus considerable variation observed among the genotypes for various yield attributes suggested good scope for developing high yielding varieties through selection and hybridization. Moreover identification and characterization of bhut jolokia genotypes is essential for protection of plant varieties and for maintenance breeding, seed production and certification.ThesisItem Open Access GENETIC DIVERSITY IN IVY GOURD [Coccinia grandis (L.) Voigt.] GENOTYPES OF NORTH EASTERN REGION BASED ON MORPHOLOGICAL AND RAPD MARKERS(AAU, Jorhat, 2014) Saikia, Jumi; Borbora Phookan, DeepaAn experiment was conducted to study the genetic diversity in ivy gourd [Coccinia grandis (L.) Voigt.] genotypes collected from different parts of Assam and other North Eastern States (Arunachal Pradesh, Tripura and Nagaland) during the summer seasons of 2013 and 2014. The experiment was laid out in Randomized Block Design with three replications at the Experimental Farm, Department of Horticulture, Assam Agricultural University, Jorhat. Morphological characterization of 22 genotypes revealed significant variation among the genotypes. The mean performance of genotypes for quantitative traits revealed that the genotype IG-23 recorded maximum for fruit characters viz., fruit length (8.50 cm), fruit weight (33.62 g) and fruit yield per plant (8.66 kg). Whereas IG-22 exhibited the highest number of primary branches (7.35), fruit width (3.03 cm) and number of fruits per plant (391.83). Promising genotypes were IG-10, IG-18, IG-22 and IG-23. Genetic variability in terms of PCV and GCV were high for yield per plant (27.56% and 23.87%, respectively). High heritability in broad sense combined with high genetic advance was recorded for number of fruits per plant (94.39%, 38.57%) followed by fruit weight (93.36%, 32.61%) which were indicative of preponderance of additive and additive x additive type of gene interaction. The correlation analysis revealed that yield per plant had significant positive correlation with number of primary branches, fruit length, number of fruits per plant and fruit weight. From the path coefficient analysis, it was observed that number of fruits per plant had the highest positive direct effect (1.1928) on yield. Number of primary branches had the highest positive indirect effect on yield via number of fruits per plant (1.1491). The residual effect was 0.1097 which was within a reasonable limit indicating that the characters included in path coefficient analysis were adequate in explaining the variation in ivy gourd. Genetic diversity using Mahalanobis’s D2 statistic grouped the genotypes into 6 clusters following the method suggested by Tocher. Among the 6 clusters the intra-cluster distance varied from 0.00 to 3.48 and maximum inter-cluster distance was observed between cluster IV and cluster V (7.83). Cluster IV showed desirable values for number of primary branches (6.66), peduncle length (2.27 cm), fruit length (7.10 cm), number of fruits per plant (302.83), fruit weight (28.92 g) and yield per plant (7.55 kg). The most important characters contributing towards divergence were fruit weight (37.23% contribution) followed by number of fruits per plant (30.30%). D2 analysis revealed that the pattern of distribution of genotypes from different locations into different cluster was random. At molecular level, 25 random decamer primers generated a total of 124 amplification products of which 52 bands were polymorphic. Total polymorphism was 41.94%. The extent of polymorphism was higher with RAPD primers such as OPB-08 (83.33%), OPC-01 (71.43%) and OPD-05 (66.66%). The dendrogram showed that UPGMA cluster analysis grouped the genotypes into 4 major clusters. In cluster I, only one genotype i.e. IG-14 was included which was out grouped from the rest of the genotypes. A fairly wide range of Jaccard’s similarity coefficient (0.10 to 1.09) was observed which indicated high level of genetic diversity. Among the nutritional traits, highest protein content (1.41 g/100 g) as well as iron (2.75 mg/100 g) were recorded in IG-22. Ascorbic acid (27.05 mg/100 g) and carotene (189 g/100 g) were found to be highest in IG-18. IG-23 recorded the highest crude fibre content (1.97%) and total ash content (6.78%).ThesisItem Open Access Nutrient Management In Post Rice Vegetale Crops(Assam Agricultural University; Jorhat, 2002) Hussain, Imran; Saikia, LuchonThesisItem Open Access Development Of A Clear Extract From Ripe Dillenia (Dillenia Indica Linn.) Fruit(Assam Agricultural University; Jorhat, 2002) Saikia, Minoti; Saikia, L.ThesisItem Open Access Effect Of Fertilizer Levels And Spacing On Growth, Yield And Quality Of Marigold(Assam Agricultural University; Jorhat, 2000) Deka, Promod Chandra; Paswan, L.ThesisItem Open Access Growth, Flowering And Post-Harvest Studies In Gerbera (Gerbera Jamesonii Bolus)(Assam Agricultural University; Jorhat, 2000) Mahanta, Pradip; Paswan, L.ThesisItem Open Access Effect Of Nitrogen Sources On Growth, Yield And Quality Of Banana Cv. Bar Jahaji (Musa Aaa Group, Cavendish Sub-Group)(Assam Agricultural University; Jorhat, 2002) Sarma, Ranjit; Bhattachayya, R. K.ThesisItem Unknown Studies On Growth, Development, Yield And Quality Of Banana Cultivars Bhimkal And Athiakal(Assam Agricultural University; Jorhat, 2000) Kotoky, Utpal; Chakrabarty, B KThesisItem Unknown Regulation Of Flowering In Some Chrysanthemum (Dendranthema Grandiflora Tzvelev.) Cultivars Under Plastic Green-House And Open Conditions(Assam Agricultural University; Jorhat, 2003) Deka, Kusum Kumar; Talukdar, Madhumita. C.