Genetic diversity in populations of Australian wild rice species (Oryza meridionales Ng.)

Date

3-1992

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Rita P. Laude

Abstract

JOYCE SARAH A. IBANA. University of the Philippines at Los Banos. B S. Biology. March 1992. Genetic Diversity in Populations Australian Wild Rice Species ( Oryza Meridlonales N9,)

Advisers: Dr. Rita P. Laude

Prof. Genoveva C. Loresto Diversity among 8 populations of 0. meridionales Was measured by starch - gel electrophoretic variation of isozymes. A total of S out of 6 enzyme loci were found to be polymorphic. One locus and an allele not previously described by Glaszmann (1988) was observed and was tentatively called Enp-2 and Sdh-1, allele 5 respectively. Genetic distance (Nei,1975) was computed based on the 6 loci and the data was subjected to principle component analysis. 0. meridionales was found to be highly diverse. population (Acc. 101147) was shown to be distinct from a cluster composed of 7 populations (Acc. 101148, 103317, 104085, 104086. 104089, 104092 and 105598). Continuous divergence was observed in the cluster. the diversity in 0. meridionales may be attributed to environmental heterogeneity in terms of spatial distribution which resulted to differentiation into annual and perennial types, or to introgression-hybridization of genes within the group. It is recommended that further study of O. meridionales back-up with biographical background of the population be done to establish the life history of the species and extensive study on endopeptidase and shikimate dehydrogenase enzymes be made to establish proposed locus Enp-2 and Sdh-1 allele 5 as new locus and allele.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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