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

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

Los Banos UPLB Philippines

2009

xii, 136 pp.

BS in Biology (Genetics)

TH-231

Genetic diversity analysis of 746 accessions based on morphological traits anc crossability studies of Solanum aethiopicum, S. melongena, S. macrocarpon, and S torvum was performed. In the quantitative morphological analysis twenty five outlien were identified using PROC UNIV ARIA TE. These included traits such as plant height plant branching, and number of locules per fruit. Groups of less correlated traits like 10C seed weight were identified using PROC V ARCLUS. Hierarchical cluster analysis wa 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 ofNTSYSpc 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% ).

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