{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T06:25:06Z","timestamp":1787034306075,"version":"build-2736575974"},"reference-count":64,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T00:00:00Z","timestamp":1787011200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Plant Sci."],"abstract":"<jats:sec>\n                    <jats:title>Aim<\/jats:title>\n                    <jats:p>\n                      Sharka, caused by\n                      <jats:italic>Plum pox virus<\/jats:italic>\n                      (PPV), is one of the most damaging viral diseases of stone fruit crops, with peach among the most susceptible cultivated\n                      <jats:italic>Prunus<\/jats:italic>\n                      species. Almond is a promising source of resistance, but its genetic architecture and expression in a peach genetic background remain largely unknown. This study aimed to construct parental genetic linkage maps and identify genomic regions associated with PPV response in almond \u00d7 peach interspecific populations.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Progenies derived from the almond cultivars \u2018Del Cid\u2019, \u2018Garrigues\u2019, and \u2018Mono\u2019 were evaluated by RT-PCR after graft inoculation with the PPV-Marcus (PPV-M) strain over consecutive infection cycles. Phenotypic data were summarized for each genotype using best linear unbiased estimates (BLUEs). High-density SNP almond and peach arrays were used to construct parental maps for \u2018Garrigues\u2019 and \u2018Mono\u2019 and perform quantitative trait locus (QTL) analysis.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Phenotypic variation was observed among and within families. \u2018Del Cid\u2019-derived progenies showed the greatest resistance, \u2018Garrigues\u2019-derived progenies displayed intermediate responses, and \u2018Mono\u2019-derived progenies showed greater susceptibility and variability. The parental maps covered 546.69 cM in \u2018Mono\u2019 and 521.72 cM in \u2018Garrigues\u2019, with average intervals of 0.61 and 1.26 cM per unique marker position, respectively, and showed strong collinearity with the reference genome. QTL associated with PPV-M response were detected on linkage groups (LG) 1 and 6 in \u2018Garrigues\u2019 and LG2 in \u2018Mono\u2019. The main QTL in \u2018Garrigues\u2019 peaked near 22.39 Mb on LG1, whereas the \u2018Mono\u2019 QTL was located at 22.27\u201322.62 Mb on LG2; a weaker QTL was detected near 25.38 Mb on LG6 in \u2018Garrigues\u2019. The results support a quantitative and genetic-background-dependent architecture of PPV resistance.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>This study provides the first evidence of genomic regions associated with PPV-Marcus response in almond \u00d7 peach populations. The detected QTLs provide an initial basis to support the introgression of almond-derived resistance into peach breeding material.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fpls.2026.1920650","type":"journal-article","created":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T05:36:04Z","timestamp":1787031364000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["First genomic insights into the introgression of almond PPV-Marcus resistance into peach"],"prefix":"10.3389","volume":"17","author":[{"given":"Luc\u00eda","family":"Rodr\u00edguez-Robles","sequence":"first","affiliation":[{"name":"Department of Plant Breeding, Centro de Edafolog\u00eda y Biolog\u00eda Aplicada del Segura (CEBAS-CSIC)","place":["Murcia, Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pedro","family":"Mart\u00ednez-G\u00f3mez","sequence":"additional","affiliation":[{"name":"Department of Plant Breeding, Centro de Edafolog\u00eda y Biolog\u00eda Aplicada del Segura (CEBAS-CSIC)","place":["Murcia, Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jorge","family":"Mas-G\u00f3mez","sequence":"additional","affiliation":[{"name":"Department of Plant Breeding, Centro de Edafolog\u00eda y Biolog\u00eda Aplicada del Segura (CEBAS-CSIC)","place":["Murcia, Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pedro Jos\u00e9","family":"Mart\u00ednez-Garc\u00eda","sequence":"additional","affiliation":[{"name":"Department of Plant Breeding, Centro de Edafolog\u00eda y Biolog\u00eda Aplicada del Segura (CEBAS-CSIC)","place":["Murcia, Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Manuel","family":"Rubio","sequence":"additional","affiliation":[{"name":"Department of Plant Breeding, Centro de Edafolog\u00eda y Biolog\u00eda Aplicada del Segura (CEBAS-CSIC)","place":["Murcia, Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,8,18]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1093\/biomet\/71.1.1","article-title":"On the existence of maximum likelihood estimates in logistic regression models","volume":"71","author":"Albert","year":"1984","journal-title":"Biometrika"},{"key":"B2","doi-asserted-by":"publisher","first-page":"455","DOI":"10.1111\/tpj.14538","article-title":"Transposons played a major role in the diversification between the closely related almond and peach genomes: results from the almond genome sequence","volume":"101","author":"Alioto","year":"2020","journal-title":"Plant J."},{"key":"B3","first-page":"603","article-title":"Le p\u00eacher GF305 indicateur polyvalent des virus des esp\u00e8ces a noyau","volume":"1","author":"Bernhard","year":"1969","journal-title":"Ann. 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