{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,4]],"date-time":"2026-09-04T06:12:24Z","timestamp":1788502344899,"version":"build-2803163510"},"reference-count":66,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,9,4]],"date-time":"2026-09-04T00:00:00Z","timestamp":1788480000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Plant Sci."],"abstract":"<jats:p>\n                    Shade-tolerant herbs occurring across contrasting radiation environments may differ not only in photosynthetic capacity but also in how assimilated carbon is stored and used. We compared two varieties of\n                    <jats:italic>Paris polyphylla<\/jats:italic>\n                    associated with lower- and higher-elevation habitats:\n                    <jats:italic>P. polyphylla<\/jats:italic>\n                    var.\n                    <jats:italic>chinensis<\/jats:italic>\n                    (PPC) and\n                    <jats:italic>P. polyphylla<\/jats:italic>\n                    var.\n                    <jats:italic>yunnanensis<\/jats:italic>\n                    (PPY), respectively. Plants were grown for 40\u00a0d under light intensity of 50, 200, and 400 \u03bcmol m\n                    <jats:sup>-<\/jats:sup>\n                    \u00b2 s\n                    <jats:sup>-<\/jats:sup>\n                    \u00b9, and we measured leaf structure, gas exchange, chlorophyll fluorescence, carboxylation traits, non-structural carbohydrates, biomass allocation, and\n                    <jats:italic>Paris<\/jats:italic>\n                    saponin VII (PS VII). At 400 \u03bcmol m\n                    <jats:sup>-<\/jats:sup>\n                    \u00b2 s\n                    <jats:sup>-<\/jats:sup>\n                    \u00b9, PPY had higher net photosynthesis and light-saturated photosynthetic capacity than PPC. Rubisco and Rubisco activase activities, maximum rate of carboxylation and maximum rate of electron transport increased across the irradiance gradient in PPY, even though its stomatal and mesophyll conductance remained lower than in PPC. PPY also maintained a higher relative electron transport rate and a higher photorespiration rate, with little change in non-photochemical quenching (\n                    <jats:italic>NPQ<\/jats:italic>\n                    ) or dark respiration. Increased irradiance shifted PPY biomass allocation belowground and increased its rhizome\/leaf soluble sugar ratio. Foliar PS VII concentration and expression of\n                    <jats:italic>PpUGT80A2<\/jats:italic>\n                    and\n                    <jats:italic>PpSmt2\u20131<\/jats:italic>\n                    also increased more strongly in PPY. In PPC, light-saturated photosynthetic capacity peaked at 200 \u03bcmol m\n                    <jats:sup>-<\/jats:sup>\n                    \u00b2 s\n                    <jats:sup>-<\/jats:sup>\n                    \u00b9, whereas\n                    <jats:italic>NPQ<\/jats:italic>\n                    and dark respiration were higher and the leaf soluble sugar\/starch ratio was lower at 400 \u03bcmol m\n                    <jats:sup>-<\/jats:sup>\n                    \u00b2 s\n                    <jats:sup>-<\/jats:sup>\n                    \u00b9. These contrasts indicate that the response of PPY to increased growth irradiance was associated with greater biochemical capacity for CO\n                    <jats:sub>2<\/jats:sub>\n                    assimilation, greater belowground allocation, and a larger foliar saponin pool. Whether saponin synthesis directly alleviates sink limitation or contributes to photoprotection requires direct measurements of carbon flux and oxidative damage.\n                  <\/jats:p>","DOI":"10.3389\/fpls.2026.1940365","type":"journal-article","created":{"date-parts":[[2026,9,4]],"date-time":"2026-09-04T05:28:38Z","timestamp":1788499718000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Contrasting photosynthetic capacity and carbon allocation under increasing irradiance in two Paris polyphylla varieties"],"prefix":"10.3389","volume":"17","author":[{"given":"Feiyan","family":"Wen","sequence":"first","affiliation":[{"name":"College of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu","place":["Sichuan, China"]},{"name":"Chinese Medicine Germplasm Resources Innovation and Effective Uses Key Laboratory of Sichuan Province, Chengdu University of Traditional Chinese Medicine","place":["Chengdu, Sichuan, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hanyi","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu","place":["Sichuan, China"]},{"name":"Chinese Medicine Germplasm Resources Innovation and Effective Uses Key Laboratory of Sichuan Province, Chengdu University of Traditional Chinese Medicine","place":["Chengdu, Sichuan, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinyu","family":"Liu","sequence":"additional","affiliation":[{"name":"College of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu","place":["Sichuan, China"]},{"name":"Chinese Medicine Germplasm Resources Innovation and Effective Uses Key Laboratory of Sichuan Province, Chengdu University of Traditional Chinese Medicine","place":["Chengdu, Sichuan, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Siyu","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu","place":["Sichuan, China"]},{"name":"Chinese Medicine Germplasm Resources Innovation and Effective Uses Key Laboratory of Sichuan Province, Chengdu University of Traditional Chinese Medicine","place":["Chengdu, Sichuan, China"]},{"name":"Mianyang Anorectal Hospital, The Eighth People\u2019s Hospital of Mianyang","place":["Mianyang, Sichuan, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jin","family":"Pei","sequence":"additional","affiliation":[{"name":"College of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu","place":["Sichuan, China"]},{"name":"Chinese Medicine Germplasm Resources Innovation and Effective Uses Key Laboratory of Sichuan Province, Chengdu University of Traditional Chinese Medicine","place":["Chengdu, Sichuan, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tao","family":"Zhou","sequence":"additional","affiliation":[{"name":"College of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu","place":["Sichuan, China"]},{"name":"Chinese Medicine Germplasm Resources Innovation and Effective Uses Key Laboratory of Sichuan Province, Chengdu University of Traditional Chinese Medicine","place":["Chengdu, Sichuan, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,9,4]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"217","DOI":"10.1016\/j.ppees.2011.04.003","article-title":"When and how should intraspecific variability be considered in trait-based plant ecology","volume":"13","author":"Albert","year":"2011","journal-title":"Perspect. 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