{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T03:57:34Z","timestamp":1790827054860,"version":"4.1.0"},"reference-count":98,"publisher":"Oxford University Press (OUP)","issue":"9","license":[{"start":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T00:00:00Z","timestamp":1787184000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,2]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Belowground carbon (C) allocation by trees, particularly through root exudation, is a key pathway influencing long-term C storage in forest soils. Future climate change scenarios, such as drought and elevated CO2 (eCO2) strongly affect trees\u2019 physiology and influence belowground C allocation. However, how the rate and chemical composition of root exudation change, especially under the combined effect of drought and eCO2, remains poorly understood. We conducted an experiment to examine the single and combined effects of drought and eCO2 on the belowground C allocation of Pinus brutia Ten saplings. Root exudates were collected, quantified and metabolically profiled. Our results revealed that under eCO2, C assimilation increased up to 2.2-fold, increasing plant biomass, while the root exudation rate and composition remained unchanged under eCO2 compared with ambient CO2 (aCO2). Additionally, when trees were exposed to drought stress, the root exudation rate increased 4.3-fold under aCO2 and up to 10.4-fold when combined with eCO2; however, overall, eCO2 had no effect on root exudation. Root starch reserves decreased under drought, whereas soluble sugars increased, with the largest increase under combined drought and eCO2. Further, drought altered exudate composition, increasing several metabolites, mainly phenolic acids (e.g., gallic acid and caffeic acid), amino acids and key osmoprotectants such as trehalose, proline and betaine. Overall, these observations show that pines strongly increased their root exudation under drought and that exudate metabolites shifted towards more specialized metabolites linked to stress metabolism.<\/jats:p>","DOI":"10.1093\/treephys\/tpag116","type":"journal-article","created":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T11:44:59Z","timestamp":1787139899000},"source":"Crossref","is-referenced-by-count":0,"title":["Increased pine root exudation of phenolic acids and amino acids under drought"],"prefix":"10.1093","volume":"46","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1930-4058","authenticated-orcid":false,"given":"Sophie","family":"Obersteiner","sequence":"first","affiliation":[{"name":"Plant & Environmental Sciences Department, Weizmann Institute of Science , 234 Herzl Street, Rehovot 7610001 ,","place":["Israel"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yaara","family":"Oppenheimer-Shaanan","sequence":"additional","affiliation":[{"name":"Plant & Environmental Sciences Department, Weizmann Institute of Science , 234 Herzl Street, Rehovot 7610001 ,","place":["Israel"]},{"name":"Department of Life Sciences, Achva Academic College , Mobile Post Shikmim, Arugot 7980400 ,","place":["Israel"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3882-8845","authenticated-orcid":false,"given":"Tamir","family":"Klein","sequence":"additional","affiliation":[{"name":"Plant & Environmental Sciences Department, Weizmann Institute of Science , 234 Herzl Street, Rehovot 7610001 ,","place":["Israel"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,8,20]]},"reference":[{"key":"2026093023223580200_ref1","doi-asserted-by":"publisher","first-page":"120","DOI":"10.1080\/22311866.2019.1605932","article-title":"Antimicrobial activity of 4-O-methylgallic acid isolated from Phyllanthus polyphyllus L. against foodborne pathogenic bacteria and yeasts","volume":"9","author":"Abhishek","year":"2019","journal-title":"J Biol Act Prod Nat"},{"key":"2026093023223580200_ref2","doi-asserted-by":"publisher","first-page":"466","DOI":"10.1111\/NPH.19615","article-title":"Unpacking the point of no return under drought in poplar: insight from stem diameter variation","volume":"242","author":"Andriantelomanana","year":"2024","journal-title":"New Phytol"},{"key":"2026093023223580200_ref3","doi-asserted-by":"publisher","first-page":"142","DOI":"10.1111\/NPH.14972","article-title":"Stored root carbohydrates can maintain root respiration for extended periods","volume":"218","author":"Aubrey","year":"2018","journal-title":"New Phytol"},{"key":"2026093023223580200_ref4","doi-asserted-by":"publisher","first-page":"104137","DOI":"10.1016\/J.ENVEXPBOT.2020.104137","article-title":"Elevated air [CO2] improves photosynthetic performance and alters biomass accumulation and partitioning in drought-stressed coffee plants","volume":"177","author":"Avila","year":"2020","journal-title":"Environ Exp Bot"},{"key":"2026093023223580200_ref5","doi-asserted-by":"publisher","first-page":"666","DOI":"10.1111\/J.1365-3040.2009.01926.X","article-title":"Regulation and function of root exudates","volume":"32","author":"Badri","year":"2009","journal-title":"Plant Cell Environ"},{"key":"2026093023223580200_ref6","doi-asserted-by":"publisher","first-page":"90","DOI":"10.1016\/J.TPLANTS.2013.11.006","article-title":"Root exudates: the hidden part of plant defense","volume":"19","author":"Baetz","year":"2014","journal-title":"Trends Plant Sci"},{"key":"2026093023223580200_ref7","doi-asserted-by":"publisher","first-page":"1675","DOI":"10.1080\/00103628909368175","article-title":"Determination of organic matter content in arid-zone soils using a simple \u201closs-on-ignition\u201d method","volume":"20","author":"Ben-Dor","year":"1989","journal-title":"Commun Soil Sci Plant Anal"},{"key":"2026093023223580200_ref8","doi-asserted-by":"publisher","first-page":"765","DOI":"10.1007\/978-981-99-5736-1_33","article-title":"Secondary metabolites","author":"Bhatla","year":"2023","journal-title":"In: Bhatla SC, Lal MA (eds) Plant physiology, development and metabolism. 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