Multivariate analysis of Solanum incanum L. based on morphological characterizations

Area of Science:

• Plant genetics and breeding
• Agricultural science
• Botany

Background:

• Solanum incanum L. is a wild relative of cultivated eggplant (S. melongena L.) with valuable traits for breeding.
• Adaptability to harsh environments and resistance to biotic/abiotic stresses make it a key genetic resource.
• Comprehensive morphological characterization of S. incanum is limited, hindering its full utilization.

Purpose of the Study:

• To evaluate the morphological diversity of 45 wild S. incanum accessions from Iran.
• To identify key morphological traits and superior genotypes for conservation and breeding programs.
• To provide a framework for germplasm conservation and future breeding initiatives.

Main Methods:

• One-way analysis of variance (ANOVA) to assess trait differences among accessions.
• Multivariate analyses (Principal Component Analysis - PCA) to identify drivers of diversity.
• Correlation and multiple regression analyses to understand trait relationships.
• Heatmap clustering to group accessions based on morphological similarity.

Main Results:

• Significant phenotypic variation was observed across all evaluated traits (p < 0.05).
• Plant architecture, fruit shape, and calyx morphology were identified as primary drivers of diversity.
• Eight elite genotypes with superior fruit dimensions and seed characteristics were identified.
• Strong correlations were found between fruit breadth and weight (r = 0.94, p < 0.01).

Conclusions:

• Solanum incanum possesses significant morphological diversity valuable for eggplant breeding.
• The identified elite genotypes are promising candidates for introgression into cultivated eggplant.
• This research provides a foundation for effective germplasm conservation and targeted breeding strategies.