{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,15]],"date-time":"2026-08-15T16:28:20Z","timestamp":1786811300355,"version":"build-2736575974"},"reference-count":102,"publisher":"Oxford University Press (OUP)","issue":"8","license":[{"start":{"date-parts":[[2026,7,4]],"date-time":"2026-07-04T00:00:00Z","timestamp":1783123200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"funder":[{"name":"US Department of Agriculture, National Institute of Food and Agriculture","award":["2023-67013-39535"],"award-info":[{"award-number":["2023-67013-39535"]}]},{"name":"Fulbright France Program- Programme Doctorants National"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,8,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Human activities are intensifying heatwaves and droughts, threatening forest ecosystems worldwide. However, understanding intraspecific variation in physiological traits that confer resistance to hotter drought is critical for predicting tree responses to climate change. In Pinus taeda L., long-term geographic isolation across the Mississippi River Valley after the last glacial maximum has resulted in distinct population genetic structures, likely reflecting historical adaptation to contrasting climatic conditions in western and eastern refugia. However, it remains unclear whether contemporary populations retain meaningful variation in traits that confer tolerance to hotter and drier conditions, such as hydraulic vulnerability and water-use regulation, which are critical for predicting responses to future climate extremes. Here, in a common garden of adult P. taeda trees planted in 2010, we characterized intraspecific variability in 22 physiological traits related to resistance to hotter droughts across 10 provenances originating from either west or east of the Mississippi River Valley. Key traits included xylem vulnerability to embolism, leaf and bark residual conductance, and leaf turgor loss point. We used an integrated indicator, Time to Hydraulic Failure (THF), predicted by a mechanistic hydraulic model, SurEau, to assess how trait combinations contribute to tree resistance to hotter droughts. While we hypothesized that western provenances would be more adapted to hotter drought, we found that THF was lower in western than eastern provenances. The THF values were negatively correlated with residual transpiration and leaf mass per area. These patterns suggest physiological differentiation between populations, although not one strictly determined by drought resistance alone. Overall, our findings demonstrate that intraspecific variation in physiological traits can inform forest management and breeding strategies, underscoring the complex interplay of hydraulic and residual transpiration traits in shaping drought resilience and emphasizing the need to integrate multiple physiological processes when predicting forest responses to climate change.<\/jats:p>","DOI":"10.1093\/treephys\/tpag092","type":"journal-article","created":{"date-parts":[[2026,7,2]],"date-time":"2026-07-02T11:37:36Z","timestamp":1782992256000},"source":"Crossref","is-referenced-by-count":0,"title":["A river runs through it: intraspecific variability in hotter-drought-related physiological traits across the Mississippi divide in\n                    <i>Pinus taeda<\/i>\n                    L"],"prefix":"10.1093","volume":"46","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6555-4715","authenticated-orcid":false,"given":"Elisabeth","family":"Ilinca","sequence":"first","affiliation":[{"name":"INRAe, PIAF, Universit\u00e9 Clermont-Auvergne , 5 chemin de Beaulieu, Clermont-Ferrand 63000 ,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2727-7072","authenticated-orcid":false,"given":"Herve","family":"Cochard","sequence":"additional","affiliation":[{"name":"INRAe, PIAF, Universit\u00e9 Clermont-Auvergne , 5 chemin de Beaulieu, Clermont-Ferrand 63000 ,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2904-810X","authenticated-orcid":false,"given":"William M","family":"Hammond","sequence":"additional","affiliation":[{"name":"School of Natural Resources and Environment, University of Florida , 2035 McCarty Hall D, Gainesville, FL 32611 ,","place":["United States"]},{"name":"Agronomy Department, University of Florida , 3105 McCarty Hall B, Gainesville, FL 32611 ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4445-3100","authenticated-orcid":false,"given":"Marylou","family":"Mantova","sequence":"additional","affiliation":[{"name":"INRAe, PIAF, Universit\u00e9 Clermont-Auvergne , 5 chemin de Beaulieu, Clermont-Ferrand 63000 ,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,7,4]]},"reference":[{"key":"2026081512111617400_ref1","article-title":"Crop evapotranspiration-guidelines for computing crop water requirements-FAO","volume":"56","author":"Allan","year":"1998","journal-title":"Irrigation and drainage paper"},{"key":"2026081512111617400_ref3","doi-asserted-by":"publisher","first-page":"660","DOI":"10.1016\/j.foreco.2009.09.001","article-title":"A global overview of drought and heat-induced tree mortality reveals emerging climate change risks for forests","volume":"259","author":"Allen","year":"2010","journal-title":"For Ecol Manage"},{"key":"2026081512111617400_ref2","doi-asserted-by":"publisher","DOI":"10.1890\/ES15-00203.1","article-title":"On underestimation of global vulnerability to tree mortality and forest die-off from hotter drought in the Anthropocene","volume":"6","author":"Allen","year":"2015","journal-title":"Ecosphere"},{"key":"2026081512111617400_ref4","volume-title":"Evolutionary dynamic of Pinus taeda L. in the late quaternary: an interdisciplinary approach","author":"Al-Rabab\u2019ah","year":"2003"},{"key":"2026081512111617400_ref5","doi-asserted-by":"publisher","first-page":"263","DOI":"10.1016\/S0378-1127(01)00584-9","article-title":"Population dynamics of Pinus taeda L. based on nuclear microsatellites","volume":"163","author":"Al-Rabab\u2019ah","year":"2002","journal-title":"For Ecol Manage"},{"key":"2026081512111617400_ref6","doi-asserted-by":"publisher","first-page":"451","DOI":"10.1111\/nph.19859","article-title":"Physiological trait coordination and variability across and within three Pinus species","volume":"244","author":"Augustine","year":"2024","journal-title":"New Phytol"},{"key":"2026081512111617400_ref7","doi-asserted-by":"publisher","first-page":"947","DOI":"10.1111\/gcb.12719","article-title":"Climate-related genetic variation in drought-resistance of Douglas-fir (Pseudotsuga menziesii)","volume":"21","author":"Bansal","year":"2015","journal-title":"Glob Chang Biol"},{"key":"2026081512111617400_ref8","doi-asserted-by":"publisher","first-page":"1580","DOI":"10.1111\/ele.12374","article-title":"Global analysis of plasticity in turgor loss point, a key drought tolerance trait","volume":"17","author":"Bartlett","year":"2014","journal-title":"Ecol Lett"},{"key":"2026081512111617400_ref9","doi-asserted-by":"publisher","first-page":"2003GL018857","DOI":"10.1029\/2003GL018857","article-title":"The 2003 heat wave in Europe: a shape of things to come? 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