Genetic characterization and quantitative trait relationship using multivariate techniques reveal diversity among...

Area of Science:

• Horticulture
• Plant Breeding
• Genetics

Background:

• Tomato (Solanum lycopersicum) is a globally significant crop with vast genetic diversity.
• Understanding genotype-trait associations is crucial for targeted breeding of improved tomato varieties.
• Ethiopia, a center of origin for many crops, harbors valuable but underutilized tomato genetic resources.

Purpose of the Study:

• To assess genetic diversity and genotype-trait associations in tomato accessions.
• To identify key traits influencing yield and performance in a controlled environment.
• To pinpoint superior tomato accessions for future breeding initiatives.

Main Methods:

• Pot experiments were conducted using a randomized complete block design with three replications.
• Genotype-trait (GT) biplot analysis was employed to visualize trait variability and associations.
• Principal Component Analysis (PCA) and clustering were used to identify key yield-contributing traits and superior accessions.

Main Results:

• Genotype-trait biplots explained over 70% variability in growth traits and 55%-65% in floral/fruit traits.
• 'Wild parent', 'CLN2498D', 'CLN2498F', 'UC Dan India', 'Ruma', 'PT4722A', 'CLN2679F', 'CLN2585C', and 'CLN2585D' were identified as top performers.
• Plant height, branching, leaf number, and floral/fruit traits were positively correlated with yield, highlighting their importance for breeding.

Conclusions:

• Accessions within Cluster I, including 'CLN2498D', 'PT4722A', 'Ruma', 'Tropimech', and 'UC Dan India', exhibited the best overall traits.
• Selection of accessions from this cluster is recommended for breeding programs aiming to enhance tomato fruit yield.
• This study provides valuable insights into tomato genetic resources for improving crop performance in Ethiopia and beyond.