"Genetic diversity and clustering of tomato [Lycopersicon lycopersicum " by Thongkhoun Sisaphaithong, Teresita L. Rosario et al.
 

Genetic diversity and clustering of tomato [Lycopersicon lycopersicum (L.) Karsten] Accessions in Laos Based on Morphological Traits

Issue Date

8-2009

Abstract

Traditional (63), introduced (4) and locally improved (2) varieties of tomato collected from Central, Southern and Northern provinces of Laos were characterized based on their morphological traits to assess the genetic diversity using the Shannon-Weaver Diversity Index. At similarity coefficient of 12.56, the dendrogram generated six clusters. Only one accession, XKH100, from central Laos was assigned to Cluster I, indicating that it is widely different from the rest of the accessions. Two introduced varieties (HHRC5 and HHRC6) from Asian Vegetable Research and Development Center (AVRDC) belonged to Cluster II. VTC25 was the lone accession assigned to Cluster III, and was significantly different from the 18 genotypes collected from the same area. Cluster IV included two sub-clusters with four accessions sourced from three different areas. Cluster V had also four accessions collected from the same site. Fifty-seven accessions were assigned to Cluster VI. Accessions had shorter maturity period (<82 days) which is a preferred characteristics for hybrid production. High percentage fruit setting under high temperature conditions was observed in 11 accessions. Most of them had sparse leaf density. Fruits that are red, either slightly flattened, rounded, high rounded, or heart-shaped and with thicker fruit wall are desirable, these being preferred by the Lao market. All accessions had small fruits based on International Plant Genetic Resources Institute (IPGRI) descriptor. High yields were obtained in 12 accessions were: BKX40, HHRC5, HHRC6, HHRC DK, HHRC MT, KHM76, KHM77, VTC21, VTC23, VTC32, VTC35, VTC42, VTC69, XKH100, and XYB106. These accessions possess two-fourths desirable traits based on the presumption that parents with good performances in most aspects usually produce a larger proportion of the progenies with better performance.

Source or Periodical Title

Philippine Journal of Crop Science

ISSN

0115-463x

Volume

34

Issue

2

Page

12-26

Document Type

Article

Frequency

tri-quarterly

Physical Description

tables, graphs, pictures, dendrogram

Language

English

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