Identification of Quantitative Trait Loci for Fruit Weight, Soluble Solids Content, and Plant Morphology Using an Introgression Line Population of Solanum pennellii in a Fresh Market Tomato Inbred Line

Introgression lines are convenient populations for the identification, fine-mapping, and functional analysis of genes that are responsible for variations in traits, particularly quantitative trait genes. An introgression line population of Solanum pennellii LA0716 in a fresh market tomato inbred line 1052 was developed by our group. This population was composed of 214 lines. In the present study, five quantitative trait loci (QTLs) for fruit weight, two QTLs for soluble solids content (SSC), three QTLs for plant height, and one QTL for leaf size were identified using this introgression line population. Among these, fw3a and fw4a for fruit weight, ssc7a for SSC, h4t2a, h4t3a, and h4t7a for plant height, and lz12a for leaf size were determined to be novel loci. These results serve as a foundation for fine-mapping and functional analysis of genes underlying these QTLs.