{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T13:35:20Z","timestamp":1789652120384,"version":"4.0.0"},"reference-count":65,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2025,3,13]],"date-time":"2025-03-13T00:00:00Z","timestamp":1741824000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","award":["2023YFD1600702-03"],"award-info":[{"award-number":["2023YFD1600702-03"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","award":["JJKH20230522CY"],"award-info":[{"award-number":["JJKH20230522CY"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Industrialization Research Project of Jilin Provincial Department of Education","award":["2023YFD1600702-03"],"award-info":[{"award-number":["2023YFD1600702-03"]}]},{"name":"Industrialization Research Project of Jilin Provincial Department of Education","award":["JJKH20230522CY"],"award-info":[{"award-number":["JJKH20230522CY"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Drought stress seriously threatens human food security, and enhancing crops\u2019 drought tolerance is an urgent problem to be solved in breeding. Quinoa is known for its high nutritional value and strong drought tolerance, but its molecular mechanism in response to drought stress is still unclear. In this study, we used drought-tolerant (D2) and drought-sensitive (ZK1) quinoa varieties, and PEG-6000 was used to simulate drought stress in quinoa seedlings. Phenotypic and physiological biochemical indicators were measured during the seedling stage, and LC-MS was used for a metabolite analysis of drought stress to explore the drought tolerance mechanism of quinoa under drought stress. With the intensification of drought stress, chlorophyll content gradually increased, and D2 reached its maximum at W4, an increase of 49.85% compared with W1. The total chlorophyll content, photosynthesis rate, and stomatal conductance of ZK1 were significantly lower than D2 under moderate and severe drought stress. Metabolomic results showed that a total of 1295 positive ion mode (pos) metabolites and 914 negative ion mode (neg) metabolites were identified. Of these, 12(R)-HETE, phosphatidylcholine, monogalactose diester (MGDG), and stachyose up-regulated expression under drought stress. Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis showed that unsaturated fatty acid biosynthesis and glycerophospholipid metabolism pathways were significantly enriched. In summary, our results elucidate that quinoa responds to drought stress by accumulating chlorophyll and sugars, activating unsaturated fatty acid metabolism, and protecting the photosynthetic system. These findings provide new insights for the breeding of drought-tolerant quinoa varieties and the study of drought tolerance mechanisms.<\/jats:p>","DOI":"10.3390\/ijms26062599","type":"journal-article","created":{"date-parts":[[2025,3,13]],"date-time":"2025-03-13T10:16:45Z","timestamp":1741861005000},"page":"2599","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Phenotypic Physiological and Metabolomic Analyses Reveal Crucial Metabolic Pathways in Quinoa (Chenopodium quinoa Willd.) in Response to PEG-6000 Induced Drought Stress"],"prefix":"10.3390","volume":"26","author":[{"given":"Qinghan","family":"Bao","sequence":"first","affiliation":[{"name":"College of Life Sciences, Jilin Normal University, Siping 136000, China"},{"name":"College of Agriculture, Inner Mongolia Agricultural University, Hohhot 010018, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yang","family":"Wu","sequence":"additional","affiliation":[{"name":"College of Agriculture, Inner Mongolia Agricultural University, Hohhot 010018, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9223-3770","authenticated-orcid":false,"given":"Huishi","family":"Du","sequence":"additional","affiliation":[{"name":"College of Geographic Sciences and Tourism, Jilin Normal University, Siping 136000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yang","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Life Sciences, Jilin Normal University, Siping 136000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yongping","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Agriculture, Inner Mongolia Agricultural University, Hohhot 010018, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,3,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Wan, T., Feng, Y., Liang, C., Pan, L., He, L., and Cai, Y. 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