{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,25]],"date-time":"2026-02-25T09:50:43Z","timestamp":1772013043175,"version":"3.50.1"},"reference-count":53,"publisher":"Canadian Science Publishing","issue":"6","license":[{"start":{"date-parts":[[2008,6,1]],"date-time":"2008-06-01T00:00:00Z","timestamp":1212278400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.nrcresearchpress.com\/page\/about\/CorporateTextAndDataMining"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Can. J. For. Res."],"published-print":{"date-parts":[[2008,6]]},"abstract":"<jats:p> This study contributes to the Pinus pinaster Ait. breeding programme, which is reaching the third generation by adding information on wood quality of 46 open-pollinated families from a progeny trial located in Leiria, Portugal, that originated from seed collected in a clonal seed orchard. A total of 552 seventeen-year-old trees were sampled at 2\u00a0m height. Trends were studied from the pith outward in variance components and narrow-sense heritability (h<jats:sup>2<\/jats:sup>) of wood density components and ring-width characteristics as well as genetic correlations between cambial ages. Mean ring density (RD), minimum density (MND), maximum density (MXD), earlywood density (EWD), latewood density (LWD), earlywood width, latewood width, ring width, latewood percentage, and heterogeneity index were determined using X-ray densitometry procedures. RD had higher genetic control (h<jats:sup>2<\/jats:sup> = 0.63), and heritability values of earlywood components (h<jats:sup>2<\/jats:sup><jats:sub>MND<\/jats:sub> = 0.54, h<jats:sup>2<\/jats:sup><jats:sub>EWD<\/jats:sub> = 0.60) exceeded those of latewood components (h<jats:sup>2<\/jats:sup><jats:sub>MXD<\/jats:sub> = 0.34, h<jats:sup>2<\/jats:sup><jats:sub>LWD<\/jats:sub> = 0.26). Heritabilities increased with ring number from pith for almost all wood density components, and there were high age\u2013age genetic correlations for wood density traits (r<jats:sub>g<\/jats:sub> &gt; 0.98). <\/jats:p>","DOI":"10.1139\/x08-013","type":"journal-article","created":{"date-parts":[[2008,6,2]],"date-time":"2008-06-02T15:35:01Z","timestamp":1212420901000},"page":"1470-1477","source":"Crossref","is-referenced-by-count":32,"title":["Age trends in genetic parameters of wood density components in 46 half-sibling families of <i>Pinus pinaster<\/i>"],"prefix":"10.1139","volume":"38","author":[{"given":"Maria Jo\u00e3o","family":"Gaspar","sequence":"first","affiliation":[{"name":"Centro de Investiga\u00e7\u00e3o e de Tecnologias Agro-Ambientais e Biol\u00f3gicas, Departamento Florestal, Universidade Tr\u00e1s-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal."},{"name":"INIA - Instituto Nacional de Recursos Biol\u00f3gicas, Quinta do Marqu\u00eas, 2780-159 Oeiras, Portugal."},{"name":"Instituto Superior de Agronomia, Centro de Estudos Florestais, Universidade T\u00e9cnica de Lisboa, Lisboa, Portugal."}]},{"given":"Jos\u00e9 Lu\u00eds","family":"Louzada","sequence":"additional","affiliation":[{"name":"Centro de Investiga\u00e7\u00e3o e de Tecnologias Agro-Ambientais e Biol\u00f3gicas, Departamento Florestal, Universidade Tr\u00e1s-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal."},{"name":"INIA - Instituto Nacional de Recursos Biol\u00f3gicas, Quinta do Marqu\u00eas, 2780-159 Oeiras, Portugal."},{"name":"Instituto Superior de Agronomia, Centro de Estudos Florestais, Universidade T\u00e9cnica de Lisboa, Lisboa, Portugal."}]},{"given":"Maria Em\u00edlia","family":"Silva","sequence":"additional","affiliation":[{"name":"Centro de Investiga\u00e7\u00e3o e de Tecnologias Agro-Ambientais e Biol\u00f3gicas, Departamento Florestal, Universidade Tr\u00e1s-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal."},{"name":"INIA - Instituto Nacional de Recursos Biol\u00f3gicas, Quinta do Marqu\u00eas, 2780-159 Oeiras, Portugal."},{"name":"Instituto Superior de Agronomia, Centro de Estudos Florestais, Universidade T\u00e9cnica de Lisboa, Lisboa, Portugal."}]},{"given":"Alexandre","family":"Aguiar","sequence":"additional","affiliation":[{"name":"Centro de Investiga\u00e7\u00e3o e de Tecnologias Agro-Ambientais e Biol\u00f3gicas, Departamento Florestal, Universidade Tr\u00e1s-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal."},{"name":"INIA - Instituto Nacional de Recursos Biol\u00f3gicas, Quinta do Marqu\u00eas, 2780-159 Oeiras, Portugal."},{"name":"Instituto Superior de Agronomia, Centro de Estudos Florestais, Universidade T\u00e9cnica de Lisboa, Lisboa, Portugal."}]},{"given":"Maria Helena","family":"Almeida","sequence":"additional","affiliation":[{"name":"Centro de Investiga\u00e7\u00e3o e de Tecnologias Agro-Ambientais e Biol\u00f3gicas, Departamento Florestal, Universidade Tr\u00e1s-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal."},{"name":"INIA - Instituto Nacional de Recursos Biol\u00f3gicas, Quinta do Marqu\u00eas, 2780-159 Oeiras, Portugal."},{"name":"Instituto Superior de Agronomia, Centro de Estudos Florestais, Universidade T\u00e9cnica de Lisboa, Lisboa, Portugal."}]}],"member":"155","reference":[{"key":"atypb1\/ref1","first-page":"267","volume":"1","author":"Aguiar A.","year":"1993","journal-title":"Silva Lusitana"},{"key":"atypb2\/ref2","first-page":"131","volume":"11","author":"Aguiar A.","year":"2003","journal-title":"Silva Lusitana"},{"key":"atypb3\/ref3","doi-asserted-by":"publisher","DOI":"10.1139\/x94-315"},{"key":"atypb4\/ref4","first-page":"327","volume":"174","author":"Chaperon H.","year":"1989","journal-title":"Ann. 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