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This project was funded by the ‘Agencia Estatal de Investigación’ (AEI) (Ministry of Science, Innovation, and Universities; Government of Spain) through grants RTA2017-00084-00-00, PID2020-114648RR-C31 and PID2020-118612RR-I00. All authors except GPS, LT, and NR were partially supported by CERCA Program, Generalitat de Catalunya. GPS was supported by a predoctoral grant (PRE2018-085207) from AEI, Spain. NR was supported by INVESTIGO Program (100049ID3), Generalitat de Catalunya.

Analysis of institutional authors

Calle, ACorresponding AuthorPons Sole, GemmaAuthorReal Tortosa, NuriaAuthorLuque, JAuthorEduardo, IAuthorTorguet, LAuthorBatlle, IAuthorMiarnau, XAuthor
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Article

Genetic mapping reveals a major locus for red leaf blotch tolerance in almond

Publicated to:Scientia Horticulturae. 339 113901- - 2025-01-01 339(), DOI: 10.1016/j.scienta.2024.113901

Authors: Calle, A; Pons-Solé, Gemma; Real, Núria; Luque, J; Eduardo, I; Torguet, L; Batlle, I; Miarnau, X

Affiliations

Ctr Res Agr Genom CRAG Consorci CSIC, IRTA, UAB UB Edif CRAG Campus Bellaterra UAB, Cerdanyola Del Valles 08193 - Author
IRTA, Ctr Cabrils, Sustainable Plant Protect, Cabrils 08348 - Author
IRTA, Fruit Prod, Fruitctr, Lleida 25003 - Author
IRTA, Fruit Prod, Mas Bove, Constanti 43120 - Author
Protecció Vegetal Sostenible . Producció Vegetal - Author
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Abstract

Red leaf blotch (RLB) of almond, caused by the fungus Polystigma amygdalinum, is a common foliar disease in Mediterranean and Middle East countries. RLB symptoms are characterized by orange spots on leaves that eventually lead to early defoliation, reducing tree photosynthetic activity and fruit production. This study aimed to investigate the genetic basis of RLB tolerance in almond. For this purpose, an F1 population (N=79) derived from a cross between two cultivars with different levels of disease tolerance ('Tarraco', highly susceptible; and 'Vairo', tolerant) was phenotyped for disease severity and incidence over four years and genotyped with the almond AxiomTM 60K SNP array. Linkage maps were constructed and used for QTL analyses. A major QTL (qPRLB-3.1m), detected across all years and accounting for up to 21 and 31% of phenotypic variation for disease incidence and severity respectively, was found at the lower end of linkage group (LG) 3. Minor QTLs, only detected in particular years and explaining low percentages of the phenotypic variations, were also detected on LGs 1, 7, and 8. qP-RLB-3.1m was targeted for haplotype analysis in the individuals of the population, and in 19 almond cultivars with different levels of disease susceptibility, revealing an interesting allele associated with increased disease tolerance. In the region spanning qP-RLB-3.1m, there were 505 annotated genes in the almond reference genome. Fourty-nine of them were related to plant defense mechanisms in other species. The possible involvement of these genes and the implementation of marker-assisted selection strategies in almond breeding programs are discussed.

Keywords
BiologyCrop diseaseDiseaseLinkage mapsPolystigma amygdalinumPrunus amygdalusQuantitative trait lociResistanceResistance genesSusceptibilityTolerance

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Scientia Horticulturae due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2025, it was in position 6/38, thus managing to position itself as a Q1 (Primer Cuartil), in the category Horticulture.

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-05-11:

  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 2 (PlumX).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.
  • Assignment of a Handle/URN as an identifier within the deposit in the Institutional Repository: http://hdl.handle.net/20.500.12327/3595
Leadership analysis of institutional authors

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (CALLE CALDERON, ALEJANDRO) and Last Author (MIARNAU PRIM, XAVIER).

the author responsible for correspondence tasks has been CALLE CALDERON, ALEJANDRO.