Journal Article

Identification of quantitative trait loci associated with bacterial spot race T4 resistance in intra-specific populations of tomato (Solanum lycopersicum L.)

Adhikari, Pragya, Siddique, Muhammad Irfan, Panthee, Dilip R., Louws, Frank J.

2023

Overview

Bacterial spot of tomato is a serious disease caused by at least four species and four races of Xanthomonas - X . euvesicatoria (race T1), X . vesicatoria (race T2), X . perforans (race T3 and T4), and X . gardneri , with X . perforans race T4 being predominant in the southeast USA. Practical management of this disease is challenging because of the need for more effective chemicals and commercially resistant cultivars. Identification of genetic resistance is the first step to developing a disease-resistant variety. The objective of this study was to identify quantitative trait loci (QTL) conferring resistance to race T4 in two independent recombinant inbred lines (RILs) populations NC 10204 (intra-specific) and NC 13666 (interspecific) developed by crossing NC 30P x NC22L-1(2008) and NC 1CELBR x PI 270443, respectively. Seven QTLs on chromosomes 2, 6, 7, 11, and 12 were identified in NC 10204. The QTL on chromosome 6 explained the highest percentage of phenotypic variance (up to 21.3%), followed by the QTL on chromosome 12 (up to 8.2%). On the other hand, the QTLs on chromosomes 1, 3, 4, 6, 7, 8, 9, and 11 were detected in NC 13666. The QTLs on chromosomes 6, 7, and 11 were co-located in NC 10204 and NC 13666 populations. The donor of the resistance associated with these QTL in NC 10204 is a released breeding line with superior horticultural traits. Therefore, both the donor parent and the QTL information will be useful in tomato breeding programs as there will be minimal linkage drag associated with the bacterial spot resistance.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Agricultural research / Antibiotics / Bacteria / Bacterial diseases of plants / Biology and Life Sciences / Chromosome 12 / Chromosome 6 / Chromosome mapping / Chromosomes / Control / Copper / Cultivars / Disease management / Disease resistance / Disease Resistance - genetics / Diseases and pests / Ethylenediaminetetraacetic acid / Gene mapping / Genetic aspects / Horticulture / Inbreeding / Medical screening / Medicine and Health Sciences / Methods / Pathogens / Phenotype / Phenotypic variations / Plant Breeding / Plant Diseases - genetics / Plant Diseases - microbiology / Plant immunology / Populations / Quantitative genetics / Quantitative Trait Loci / Research and Analysis Methods / Seeds / Solanum lycopersicum / Solanum lycopersicum - genetics / Spot / Tomatoes / Virulence / Xanthomonas / Xanthomonas euvesicatoria / Xanthomonas perforans / Xanthomonas vesicatoria