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Pink H, Talbot A, Graceson A, Graham J, Higgins G, Taylor A, Jackson AC, Truco M, Michelmore R, Yao C, Gawthrop F, Pink D, Hand P, Clarkson JP, Denby K. Identification of genetic loci in lettuce mediating quantitative resistance to fungal pathogens. Theor Appl Genet 2022; 135:2481-2500. [PMID: 35674778 PMCID: PMC9271113 DOI: 10.1007/s00122-022-04129-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Accepted: 05/16/2022] [Indexed: 06/15/2023]
Abstract
KEY MESSAGE We demonstrate genetic variation for quantitative resistance against important fungal pathogens in lettuce and its wild relatives, map loci conferring resistance and predict key molecular mechanisms using transcriptome profiling. Lactuca sativa L. (lettuce) is an important leafy vegetable crop grown and consumed globally. Chemicals are routinely used to control major pathogens, including the causal agents of grey mould (Botrytis cinerea) and lettuce drop (Sclerotinia sclerotiorum). With increasing prevalence of pathogen resistance to fungicides and environmental concerns, there is an urgent need to identify sources of genetic resistance to B. cinerea and S. sclerotiorum in lettuce. We demonstrated genetic variation for quantitative resistance to B. cinerea and S. sclerotiorum in a set of 97 diverse lettuce and wild relative accessions, and between the parents of lettuce mapping populations. Transcriptome profiling across multiple lettuce accessions enabled us to identify genes with expression correlated with resistance, predicting the importance of post-transcriptional gene regulation in the lettuce defence response. We identified five genetic loci influencing quantitative resistance in a F6 mapping population derived from a Lactuca serriola (wild relative) × lettuce cross, which each explained 5-10% of the variation. Differential gene expression analysis between the parent lines, and integration of data on correlation of gene expression and resistance in the diversity set, highlighted potential causal genes underlying the quantitative trait loci.
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Affiliation(s)
- Harry Pink
- Biology Department, Centre for Novel Agricultural Products (CNAP), University of York, Wentworth Way, York, YO10 5DD, UK
| | - Adam Talbot
- Biology Department, Centre for Novel Agricultural Products (CNAP), University of York, Wentworth Way, York, YO10 5DD, UK
| | - Abi Graceson
- Department of Agriculture and Environment, Harper Adams University, Newport, Shropshire, TF10 8NB, UK
| | - Juliane Graham
- Department of Agriculture and Environment, Harper Adams University, Newport, Shropshire, TF10 8NB, UK
| | - Gill Higgins
- Biology Department, Centre for Novel Agricultural Products (CNAP), University of York, Wentworth Way, York, YO10 5DD, UK
| | - Andrew Taylor
- School of Life Sciences, University of Warwick, Wellesbourne Campus, Warwick, CV35 9EF, UK
| | - Alison C Jackson
- School of Life Sciences, University of Warwick, Wellesbourne Campus, Warwick, CV35 9EF, UK
| | - Maria Truco
- Genome Center, University of California Davis, One Shields Ave, Davis, CA, 95616, USA
| | - Richard Michelmore
- Genome Center, University of California Davis, One Shields Ave, Davis, CA, 95616, USA
| | - Chenyi Yao
- A. L. Tozer Ltd., Pyports, Downside Road, Cobham, Surrey, KT11 3EH, UK
| | - Frances Gawthrop
- A. L. Tozer Ltd., Pyports, Downside Road, Cobham, Surrey, KT11 3EH, UK
| | - David Pink
- Department of Agriculture and Environment, Harper Adams University, Newport, Shropshire, TF10 8NB, UK
| | - Paul Hand
- Department of Agriculture and Environment, Harper Adams University, Newport, Shropshire, TF10 8NB, UK
| | - John P Clarkson
- School of Life Sciences, University of Warwick, Wellesbourne Campus, Warwick, CV35 9EF, UK
| | - Katherine Denby
- Biology Department, Centre for Novel Agricultural Products (CNAP), University of York, Wentworth Way, York, YO10 5DD, UK.
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