Collection and characterization of unique genotypes of nutmeg (Myristica fragrans Houtt.) (Record no. 154956)
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| fixed length control field | 06884nam a22002057a 4500 |
| 003 - CONTROL NUMBER IDENTIFIER | |
| control field | OSt |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20220528144011.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 220528b ||||| |||| 00| 0 eng d |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 633.8 |
| Item number | PRI/CO |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Priyanka S Chandran |
| 245 ## - TITLE STATEMENT | |
| Title | Collection and characterization of unique genotypes of nutmeg (Myristica fragrans Houtt.) |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication, distribution, etc. | Vellanikkara |
| Name of publisher, distributor, etc. | Department of Plantation and Spices, College of Horticulture |
| Date of publication, distribution, etc. | 2016 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 101 pages |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | MSc |
| 520 3# - SUMMARY, ETC. | |
| Summary, etc. | The present study entitled “Collection and characterization of unique genotypes of nutmeg (Myristica fragrans Houtt.)” was carried out at the Department of Plantation Crops and Spices, College of Horticulture, Vellanikkara, Thrissur with the objective to collect and characterize the unique nutmeg accessions based on morphological and biochemical parameters. Twenty one unique accessions possessing 13 unique characters were identified and collected through an extensive survey throughout the nutmeg growing tracts of Kerala. The unique accessions collected from diverse locations of Kerala along with the two improved accessions identified in an earlier study formed the material for the present study. Morphological characterization was attempted using 18 qualitative and 31 quantitative parameters as per the nutmeg descriptor. Fruits collected from these unique accessions were subjected to biochemical estimation of constituents in rind, nutmeg and mace. The mace and kernel volatiles were subjected to GC MS analysis. The unique germplasm included yellow maced nutmegs which is a desirable characteristic that is rarely spotted in the nutmeg family. Another unique tree with rudimentary sterile seed / seedless nature was located which is an exception from the normal. This accession had a good measure of fresh mace (9.74 g), mace oil and oleoresin content. The double seeded nutmeg accessions DS-1and DS-2 may be regarded as accessions having aberration in terms of mace and nut characteristics, with a typical four halved fruit splitting nature and two seeds per fruit. Monoecy is a very much preferred characteristic as nutmeg is usually classified as dioecious in nature, but the two monoecious accessions namely MN- 1 and MN-2 had very less number of fruits with average quality mace and nut. The two cluster fruited accessions had on an average three fruits per bunch and four to eight fruits per cluster occasionally. Accession CF-1 had high nut andmace yield per tree among all the unique nutmeg accessions collected in the present study. Among the low astringent nutmeg accessions, LA-2 adds robustness towards further research in nutmeg for use in the value addition of rind. The narrowly pyramidal (conical) shaped nutmeg accessions PT-1 and PT-2 had the least canopy spread. Grape nutmeg is another interesting unique accession with numerous small sized fruits, thin mace and small nut. Wild nutmeg (Myristica malabarica ) accessions had large brown velvety fruits with yellowish orange coloured oblong mace. Oblong shaped nutmeg was another interesting distinct feature noticed in the study. Another accession with triangular shaped mace was spotted which possessed the second highest sabinene content in kernel oil among all unique accessions. Small leaf type nutmeg labelled SM-1 possessed dark green coloured narrow elliptic leaves with a nut and mace yield comparable to cluster fruited nutmeg. Among the quantitative tree characteristics, canopy spread was lowest in narrowly pyramidal accessions. Small leaved nutmeg had smallest leaf dimensions and leaf area was only half that of the normal nutmeg. Monoecious nutmeg had significantly high measure of flower characteristics. Biochemical characterization of volatile and nonvolatile contents of mace and nut revealed that accession GT-1 had high kernel oil recovery, MN-2 had high kernel oleoresin recovery and CF-1 had high fat content in kernel. Chemo profiling of the mace and kernel volatiles identified thirty eight constituents. Among these, myristicin ,elemicin, sabinene and safrole were the major constituents. Highest myristicin, sabinene, safrole and elemicin in mace oil were observed in GT-1, OB-2, LA- 1and MN-1. Highest myristicin, sabinene, safrole and elemicin in kernel oil were observed in LA-2, MN-2, CF-1 and MN-1. Based on qualitative tree, flower and fruit characters, twenty three unique nutmeg accessions were grouped into twelve clusters at 60% similarity. The similarities noticed were assessed through UPGMA (unweighted pair group method with arithematic mean) method and a dendrogram was drawn accordingly using NTSYS package 2.2. Similarity studies among unique accessions revealedthat majority of accessions had broadly pyramidal canopy architecture with spreading branching pattern. Inflorescence noticed was axillary raceme in majority, with the exceptional umbellate cyme inflorescence in monoecious, double seeded and grape nutmeg accessions. Mid and late season flowering nature was exhibited by majority of the unique accessions. Mace colour was predominantly red with exceptions to yellow maced and wild nutmeg. Monoecious nutmeg had three halved fruit splitting nature, while double seeded nutmeg had four halved fruit splitting nature. All the fruit characteristics were measured and put to analysis for identification of sub groups among the 23 accessions using Univariate General Linear model. Further a ranking technique was adopted to bring the different characteristics present in the unique accessions into a comparative scaled value in one dimension. Based on the pooled rank scores, five groups namely extra ordinary, very good, good, moderate and heteroscedastic groups were obtained. The measured variability for each of the characteristics that were prominent among the five groups were listed as: leaf length (19.13%) and length of flower (24.81%) in ‘Very good’ group; plant height with a CV of 45.12%, girth with a CV of 75.27%, canopy spread N-S (38.98%)and E-W (40.39%), breadth of flower with a CV of (11.74%) and breadth of perianth (36.36%) in ‘Good’ group; leaf breadth (23.56%) and leaf area (26.99%)in ‘Moderate’ group; length of perianth in ‘Heteroscedastic’ group. A concept diagram was developed for utilizing the unique nutmeg accessions. All the unique accessions are worthy of conservation. Apart from conservation value, SL-1 and LA-2 offer scope for value addition of rind. Accession GT-1 and GT-2 are best suitable for ornamental purpose. Accession CF-1 which possesses all the desirable features of an elite nutmeg genotype can be commercially popularized as a variety. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Department of Plantation and Spices |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Mini Raj N (Guide) |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | http://krishikosh.egranth.ac.in/handle/1/5810032265 |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | |
| Koha item type | Theses |
| Withdrawn status | Lost status | Damaged status | Not for loan | Collection code | Permanent Location | Current Location | Shelving location | Date acquired | Full call number | Barcode | Date last seen | Price effective from | Koha item type |
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| Not For Loan | Reference Book | KAU Central Library, Thrissur | KAU Central Library, Thrissur | Theses | 2017-03-03 | 633.8 PRI/CO | 173807 | 2017-03-03 | 2017-03-03 | Theses |