{
  "abstract": "Fluctuating light strongly limits photosynthetic efficiency in plants, yet the mechanisms coordinating stomatal dynamics with rapid photosynthetic induction remain incompletely understood. Here, through a forward physiological screen in Arabidopsis, we identify the abscisic acid (ABA) transporters NPF2.4 and NPF2.5 as regulators of photosynthetic responses to fluctuating light. Loss-of-function npf2.4 and npf2.5 mutants exhibited accelerated stomatal opening and photosynthetic induction during light transitions, resulting in enhanced biomass accumulation and seed yield without compromising long-term drought tolerance. NPF2.4 and NPF2.5 mediated ABA uptake in yeast and were predominantly expressed in the root pericycle and cortex/epidermal tissues, respectively. Reciprocal grafting, xylem sap ABA measurements, and ABA treatment to the roots demonstrated that both transporters regulate root-to-shoot ABA transport. Our findings reveal that root-derived ABA modulates stomatal dynamics and photosynthetic efficiency under fluctuating light, establishing long-distance hormone transport as a key regulator of plant carbon gain in dynamic environments.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "New results",
  "arxiv": null,
  "author_total": 9,
  "authors": [
    {
      "name": "Wataru Yamori"
    },
    {
      "name": "Yuchen Qu"
    },
    {
      "name": "Alice Rossille"
    },
    {
      "name": "Christian Dubos"
    },
    {
      "name": "Yuri Kanno"
    },
    {
      "name": "Yumiko Takebayashi"
    },
    {
      "name": "Masami Y Hirai"
    },
    {
      "name": "Shunsuke Watanabe"
    },
    {
      "name": "Mitsunori Seo"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/chpgfk91wpf3q.bib",
  "cited_by": 0,
  "doi": "10.64898/2026.10.07.757215",
  "fulltext_url": "https://www.biorxiv.org/content/10.64898/2026.10.07.757215v1.full",
  "id": "chpgfk91wpf3q",
  "issns": [],
  "landing_url": "https://hal.inrae.fr/hal-05840561v1",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "biorxiv",
      "plant biology"
    ],
    [
      "hal",
      "0.sdv"
    ],
    [
      "hal",
      "1.sdv.bv"
    ],
    [
      "openalex",
      "1312|Photosynthetic Processes and Mechanisms"
    ]
  ],
  "openalex": "W7220868817",
  "pdf_url": "https://hal.inrae.fr/hal-05840561/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/chpgfk91wpf3q.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:02Z",
      "native_id": "hal-05840561",
      "source": "hal",
      "url": "https://hal.inrae.fr/hal-05840561v1"
    },
    {
      "first_seen": "2026-10-30T12:26:25Z",
      "native_id": "10.64898/2026.10.07.757215",
      "source": "biorxiv",
      "url": "https://www.biorxiv.org/content/10.64898/2026.10.07.757215v1"
    }
  ],
  "subjects": [
    {
      "field": "biology",
      "origin": "biorxiv:plant biology",
      "subfield": "plant-biology"
    }
  ],
  "title": "Root-to-shoot ABA transport by NPF2.4 and NPF2.5 links stomatal regulation to photosynthetic performance",
  "title_text": "Root-to-shoot ABA transport by NPF2.4 and NPF2.5 links stomatal regulation to photosynthetic performance",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:25Z",
  "url": "https://research.draconitic.com/paper/chpgfk91wpf3q",
  "venue": "HAL",
  "versions": []
}