Quantitative Trait Loci Mapping for Bacterial Wilt Resistance and Plant Height in Tomatoes

Abstract

Bacterial wilt (BW) of tomatoes, caused by Ralstonia solanacearum, is a devastating disease that results in large annual yield losses worldwide. Management of BW of tomatoes is difficult due to the soil-borne nature of the pathogen. One of the best ways to mitigate the losses is through breeding for disease resistance. Moreover, plant height (PH) is a crucial element related to plant architecture, which determines nutrient management and mechanical harvesting in tomatoes. An intraspecific F2 segregating population (NC 11212) of tomatoes was developed by crossing NC 84173 (tall, BW susceptible) × CLN1466EA (short, BW resistant). We performed quantitative trait loci (QTL) mapping using single nucleotide polymorphic (SNP) markers and the NC 11212 F2 segregating population. The QTL analysis for BW resistance revealed a total of three QTLs on chromosomes 1, 2, and 3, explaining phenotypic variation (R2) ranging from 3.6% to 14.9%, whereas the QTL analysis for PH also detected three QTLs on chromosomes 1, 8, and 11, explaining R2 ranging from 7.1% to 11%. This work thus provides information to improve BW resistance and plant architecture-related traits in tomatoes.

QTL Mapping for Bacterial Wilt Resistance in Eggplant via Bulked Segregant Analysis Using Genotyping by Sequencing

“…In tomato, numerous studies have been conducted to map resistant QTLs against bacterial wilt. These studies have identified QTLs associated with bacterial wilt resistance on chromosomes 1, 2, 3, 4, 6, 7, 8, 10, and 12 with different R 2 value [10][11][12]. Notably, the QTLs on chromosomes 6 and 12 have been consistently detected under varying environmental conditions, using different mapping materials, and employing different inoculation methods, thus confirming their status as major QTLs [12,13].…”