High-resolution genetic dissection of the major QTL for tipburn resistance in lettuce, Lactuca sativa

Author:

Macias-González Miguel12,Truco Maria Jose1,Han Rongkui1ORCID,Jenni Sylvie3,Michelmore Richard W12ORCID

Affiliation:

1. The Genome Center, University of California, Davis, Davis, CA 95616, USA

2. Department of Plant Sciences, University of California, Davis, Davis, CA 95616, USA

3. Science and Technology Branch, Agriculture and Agri-Food Canada, Saint-Jean-sur-Richelieu, QC J3B 3E6, Canada

Abstract

Abstract Tipburn is an important physiological disorder of lettuce, Lactuca sativa L., related to calcium deficiency that can result in leaf necrosis and unmarketable crops. The major quantitative trait locus (QTL), qTPB5.2, can account for up to 70% of the phenotypic variance for tipburn incidence in the field. This QTL was genetically dissected to identify candidate genes for tipburn by creating lines with recombination events within the QTL and assessing their resistance to tipburn. By comparing lines with contrasting haplotypes, the genetic region was narrowed down to ∼877 Kb that was associated with a reduction of tipburn by ∼60%. Analysis of the lettuce reference genome sequence revealed 12 genes in this region, one of which is a calcium transporter with a single nucleotide polymorphism in an exon between haplotypes with contrasting phenotypes. RNA-seq analysis of recombinants revealed two genes that were differentially expressed between contrasting haplotypes consistent with the tipburn phenotype. One encodes a Teosinte branched1/Cycloidea/Proliferating Cell factor transcription factor; however, differential expression of the calcium transporter was detected. The phenotypic data indicated that there is a second region outside of the ∼877 Kb region but within the QTL, at which a haplotype from the susceptible parent decreased tipburn by 10–20%. A recombinant line was identified with beneficial haplotypes in each region from both parents that showed greater tipburn resistance than the resistant parent; this line could be used as the foundation for breeding cultivars with more resistance than is currently available.

Funder

United States Department of Agriculture

National Institute of Food and Agriculture, Specialty Crop Research Initiative

Publisher

Oxford University Press (OUP)

Subject

Genetics(clinical),Genetics,Molecular Biology

Reference75 articles.

1. Basic local alignment search tool;Altschul;J Mol Biol,1990

2. Effects of artificial enclosure of young lettuce Lactuca sativa cultivar Buttercrunch leaves on tipburn incidence and leaf calcium concentration;Barta;J Am Soc Hortic Sci,1986

3. Calcium localization in lettuce leaves with and without tipburn: comparison of controlled-environment and field-grown plants;Barta;J Am Soc Hortic Sci,1991

4. Calcium localization and tipburn development in lettuce leaves during early enlargement;Barta;J Am Soc Hortic Sci,2000

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