Genetic diversity in four Solanum spp. (S. aethiopicum L., S. macrocarpon L., S. melongena L., and S. torvum Sw.) based on morphological characteristics and crossability studies

Date

4-2009

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Celia B. Dela Viña

Abstract

NELSON, ZANE OLIVER III .2009. GENETIC DIVERSITY IN FOUR SOLANUM SPP. (S. AETHIOPICUM L., S MACROCARPON L., S. MELONGENA L., AND S TORVUM SW.) BASED ON MORPHOLOGICAL CHARACTERISTICS AND CROSSABILITY STUDIES. University of the Philippines Los Banos. B.S. Biology Major in Genetics

Adviser: Prof. Celia B. Dela Vina ABSTRACT

Genetic diversity analysis of 746 accessions based on morphological traits and crossability studies of Solanum aethiopicum, S. melongena, S. macrocarpon, and S. torvum was performed. In the quantitative morphological analysis twenty five outliers were identified using PROC UNIVARIATE. These included traits such as plant height, plant branching, and number of locules per fruit . Groups of less correlated traits like 100 seed weight were identified using PROC VARCLUS. Hierarchical cluster analysis was performed on less correlated traits together with the highly correlated traits using PROC CLUSTER . Two clustering statistics namely pseudo F and cubic clustering criterion indicated a common value of 10 clusters. S melongena was present in six out of ten clusters indicating very wide diversity among the accessions. All the accessions of S. macrocarpon clustered together, indicating high morphological and genetic similarity. S aethiopicum composed most of the single accession clusters indicating its unique genetic characteristics. S. torvum readily clustered with S. melongena in four clusters showing that some accessions of each species share characteristics with each other. Using the interactive mode of NTSYSpc version 2.1z, the SIMQUAL, SAHN and tree plot options were selected to cluster-analyze the nominal traits of the four species of Solanum. Clusters formed were not that distinguishable from one another indicating that diversity was not that great. Based on nominal traits, the majority of the accessions studied were highly similar with each other. Crossability experiments using representative accessions showed that S. aethiopicum as female and S. torvum as male produced high fruit set (40%)

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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