Morphological diversity of Solanum nigrum complex at the Asian Vegetable Research and Development Center (AVRDC), Taiwan

Date

4-2005

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

Morphological diversity of the 21 selected accessories belonging to solanum nigrum complex was determined using the SAS software Release 6.03 and NTSYSpc version 2.0. the 13 outliers or occasions with extreme values for the 19 ration scale traits like germination period, leaf blade length and plant height were identified through the UNIVARIATE procedure of the SAS Software. Prior to cluster analysis, traits considered to be correlated were determined using VARCLUS procedure. Based on the 14 less correlated traits, a separate cluster analysis was done with the PROC CLUSTER statement (method-average using std option). From the plots of pseudo F. cubic clustering criterion, and pseudo t2, 8 clusters were chosen to stratify the accessions. Utilizing the TREE procedure the dendrogram shows an increasing trend in average Euclidean distance within the successive formation of clusters. Cluster analysis shows that the clusters I and V included the three S. villosum accession from Japan and Bangladesh. On the other hand, S americanum accessions from the Philippines were placed into the first four clusters. Based on the II available nominal traits at the simple matching coefficient value of 0.864, the 21 accessions of S. nigrum complex were divided into 8 main clusters. Cluster analysis based on these traits reveals that the clusters II, IV, V, VII and VIII had no S. villosum accessions. These accessions were rather grouped with S. americanum accessions from the Philippines, Japan and Vietnam in the 3 residual clusters, signifying high variability for such traits. Clusters formed were distinguished from each other based on the differences and similarities between the ratio scale and nominal traits of each occasion, respectively.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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