2021 article

Homoeologous chromosome exchange explains the creation of a QTL affecting soil-borne pathogen resistance in tobacco

Shi, R., Jin, J., Nifong, J. M., Shew, D., & Lewis, R. S. (2021, October 22). PLANT BIOTECHNOLOGY JOURNAL.

By: R. Shi n, J. Jin n, J. Nifong n, D. Shew n & R. Lewis n

author keywords: homoeologous exchange; QTL; resistance; SAR8; 2; tobacco; Phytophthora
MeSH headings : Chromosomes, Plant / genetics; Disease Resistance / genetics; Plant Diseases / genetics; Quantitative Trait Loci / genetics; Soil; Tobacco / genetics
TL;DR: A role for genomic rearrangements in the generation of favourable genetic variability affecting resistance to pathogens in plants is suggested. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
3. Good Health and Well-being (OpenAlex)
13. Climate Action (Web of Science)
Source: Web Of Science
Added: November 1, 2021

SummaryCrop plant partial resistance to plant pathogens controlled by quantitative trait loci (QTL) is desirable in cultivar development programmes because of its increased durability. Mechanisms underlying such resistance are difficult to study. We performed RNA‐seq analyses for tobacco (Nicotiana tabacum) nearly isogenic lines (NILs) with and without favourable allele(s) at Phn7.1, a major QTL influencing partial resistance to the soil‐borne pathogens Phytophthora nicotianae and Ralstonia solanacearum. Based upon combined analyses of transcriptome‐based sequence variation and gene expression profiles, we concluded that allelic variability at the Phn7.1 locus was likely generated from homoeologous exchange, which led to deletion of low‐expressing members of the SAR8.2 gene family and duplication of high‐expressing SAR8.2 genes from a different subgenome of allotetraploid tobacco. The high expression of endogenous Phn7.1‐associated SAR8.2 genes was correlated with observed resistance to P. nicotianae. Our findings suggest a role for genomic rearrangements in the generation of favourable genetic variability affecting resistance to pathogens in plants.