Genetic diversity study of Pinus merkusii Jungh. & de Vriese in the Philippines
Date of Publication
2015
Document Type
Master's Thesis
Degree Name
Master of Science in Biology
Subject Categories
Biology
College
College of Science
Department/Unit
Biology
Thesis Adviser
Esperanza Maribel G. Agoo
Defense Panel Chair
Chona Camille E. Vince Cruz
Defense Panel Member
Glenn G. Oyong
Inocencio E. Buot, Jr.
Abstract/Summary
Evaluating the population status, morphological differences and degree of genetic variation of the remaining populations of Pinus merkusii is crucial for planning effective conservation methods. Samples from Guisguis (Sta. Cruz, Zambales), Mt. Tapulao (Palauig, Zambales) and Sablayan (Occidental Mindoro) were assessed using quadrat method, vegetation analysis, needle morphological analysis and microsatellite analysis. Pinus merkusii is suggested to be listed as Endangered at the national level with less than 5000 km² extent of occurrence and due to the continuing decline in habitat quality caused by mining and forest fires. It is the dominant species in its habitat, along with shrubs from Rubiaceae, Lamiaceae and Lauraceae and an understory of grass (Poaceae). Species diversity was highest in Mt. Tapulao followed by Guisguis and Pagasa. Needle morphological variation and genetic diversity were highest in Guisguis within and among populations which was largely attributed to its low elevation. The lowest genetic diversity observed in Mindoro was attributed to its isolation from mainland Luzon. However, its heterozygosity and inbreeding coefficient was closely equivalent to Mt. Tapulao, suggesting that its isolation as an island did not cause significant genetic variation. Gene flow in P. merkusii populations implies that the three populations studied though geographically isolated, were not reproductively isolated. In situ conservation methods are recommended in Guisguis to maintain or enhance its genetic diversity. Implementation of botanical gardens and seed orchards with representatives from all populations is also suggested, as well as the evaluation of genetic diversity of P. merkusii using other informative genes.
Abstract Format
html
Language
English
Format
Electronic
Accession Number
CDTG006526
Shelf Location
Archives, The Learning Commons, 12F Henry Sy Sr. Hall
Physical Description
1 computer optical disc; 4 3/4 in.
Keywords
Pinus merkusii
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Recommended Citation
Abanador, L. C. (2015). Genetic diversity study of Pinus merkusii Jungh. & de Vriese in the Philippines. Retrieved from https://animorepository.dlsu.edu.ph/etd_masteral/5034