An eQTL analysis of partial resistance to Puccinia hordei in barley.

<h4>Background</h4>Genetic resistance to barley leaf rust caused by Puccinia hordei involves both R genes and quantitative trait loci. The R genes provide higher but less durable resistance than the quantitative trait loci. Consequently, exploring quantitative or partial resistance has b...

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Autores principales:	Xinwei Chen, Christine A Hackett, Rients E Niks, Peter E Hedley, Clare Booth, Arnis Druka, Thierry C Marcel, Anton Vels, Micha Bayer, Iain Milne, Jenny Morris, Luke Ramsay, David Marshall, Linda Cardle, Robbie Waugh
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2010
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/aeaba95af252498a97e03454944c967e
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spelling	oai:doaj.org-article:aeaba95af252498a97e03454944c967e2021-11-25T06:26:53ZAn eQTL analysis of partial resistance to Puccinia hordei in barley.1932-620310.1371/journal.pone.0008598https://doaj.org/article/aeaba95af252498a97e03454944c967e2010-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20066049/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Genetic resistance to barley leaf rust caused by Puccinia hordei involves both R genes and quantitative trait loci. The R genes provide higher but less durable resistance than the quantitative trait loci. Consequently, exploring quantitative or partial resistance has become a favorable alternative for controlling disease. Four quantitative trait loci for partial resistance to leaf rust have been identified in the doubled haploid Steptoe (St)/Morex (Mx) mapping population. Further investigations are required to study the molecular mechanisms underpinning partial resistance and ultimately identify the causal genes.<h4>Methodology/principal findings</h4>We explored partial resistance to barley leaf rust using a genetical genomics approach. We recorded RNA transcript abundance corresponding to each probe on a 15K Agilent custom barley microarray in seedlings from St and Mx and 144 doubled haploid lines of the St/Mx population. A total of 1154 and 1037 genes were, respectively, identified as being P. hordei-responsive among the St and Mx and differentially expressed between P. hordei-infected St and Mx. Normalized ratios from 72 distant-pair hybridisations were used to map the genetic determinants of variation in transcript abundance by expression quantitative trait locus (eQTL) mapping generating 15685 eQTL from 9557 genes. Correlation analysis identified 128 genes that were correlated with resistance, of which 89 had eQTL co-locating with the phenotypic quantitative trait loci (pQTL). Transcript abundance in the parents and conservation of synteny with rice allowed us to prioritise six genes as candidates for Rphq11, the pQTL of largest effect, and highlight one, a phospholipid hydroperoxide glutathione peroxidase (HvPHGPx) for detailed analysis.<h4>Conclusions/significance</h4>The eQTL approach yielded information that led to the identification of strong candidate genes underlying pQTL for resistance to leaf rust in barley and on the general pathogen response pathway. The dataset will facilitate a systems appraisal of this host-pathogen interaction and, potentially, for other traits measured in this population.Xinwei ChenChristine A HackettRients E NiksPeter E HedleyClare BoothArnis DrukaThierry C MarcelAnton VelsMicha BayerIain MilneIain MilneJenny MorrisLuke RamsayDavid MarshallLinda CardleRobbie WaughPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 5, Iss 1, p e8598 (2010)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xinwei Chen Christine A Hackett Rients E Niks Peter E Hedley Clare Booth Arnis Druka Thierry C Marcel Anton Vels Micha Bayer Iain Milne Iain Milne Jenny Morris Luke Ramsay David Marshall Linda Cardle Robbie Waugh An eQTL analysis of partial resistance to Puccinia hordei in barley.
description	<h4>Background</h4>Genetic resistance to barley leaf rust caused by Puccinia hordei involves both R genes and quantitative trait loci. The R genes provide higher but less durable resistance than the quantitative trait loci. Consequently, exploring quantitative or partial resistance has become a favorable alternative for controlling disease. Four quantitative trait loci for partial resistance to leaf rust have been identified in the doubled haploid Steptoe (St)/Morex (Mx) mapping population. Further investigations are required to study the molecular mechanisms underpinning partial resistance and ultimately identify the causal genes.<h4>Methodology/principal findings</h4>We explored partial resistance to barley leaf rust using a genetical genomics approach. We recorded RNA transcript abundance corresponding to each probe on a 15K Agilent custom barley microarray in seedlings from St and Mx and 144 doubled haploid lines of the St/Mx population. A total of 1154 and 1037 genes were, respectively, identified as being P. hordei-responsive among the St and Mx and differentially expressed between P. hordei-infected St and Mx. Normalized ratios from 72 distant-pair hybridisations were used to map the genetic determinants of variation in transcript abundance by expression quantitative trait locus (eQTL) mapping generating 15685 eQTL from 9557 genes. Correlation analysis identified 128 genes that were correlated with resistance, of which 89 had eQTL co-locating with the phenotypic quantitative trait loci (pQTL). Transcript abundance in the parents and conservation of synteny with rice allowed us to prioritise six genes as candidates for Rphq11, the pQTL of largest effect, and highlight one, a phospholipid hydroperoxide glutathione peroxidase (HvPHGPx) for detailed analysis.<h4>Conclusions/significance</h4>The eQTL approach yielded information that led to the identification of strong candidate genes underlying pQTL for resistance to leaf rust in barley and on the general pathogen response pathway. The dataset will facilitate a systems appraisal of this host-pathogen interaction and, potentially, for other traits measured in this population.
format	article
author	Xinwei Chen Christine A Hackett Rients E Niks Peter E Hedley Clare Booth Arnis Druka Thierry C Marcel Anton Vels Micha Bayer Iain Milne Iain Milne Jenny Morris Luke Ramsay David Marshall Linda Cardle Robbie Waugh
author_facet	Xinwei Chen Christine A Hackett Rients E Niks Peter E Hedley Clare Booth Arnis Druka Thierry C Marcel Anton Vels Micha Bayer Iain Milne Iain Milne Jenny Morris Luke Ramsay David Marshall Linda Cardle Robbie Waugh
author_sort	Xinwei Chen
title	An eQTL analysis of partial resistance to Puccinia hordei in barley.
title_short	An eQTL analysis of partial resistance to Puccinia hordei in barley.
title_full	An eQTL analysis of partial resistance to Puccinia hordei in barley.
title_fullStr	An eQTL analysis of partial resistance to Puccinia hordei in barley.
title_full_unstemmed	An eQTL analysis of partial resistance to Puccinia hordei in barley.
title_sort	eqtl analysis of partial resistance to puccinia hordei in barley.
publisher	Public Library of Science (PLoS)
publishDate	2010
url	https://doaj.org/article/aeaba95af252498a97e03454944c967e
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An eQTL analysis of partial resistance to Puccinia hordei in barley.

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