{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T13:31:18Z","timestamp":1787059878301,"version":"build-2736575974"},"reference-count":58,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T00:00:00Z","timestamp":1787011200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Department of Agriculture and Rural Affairs of Fujian Province","award":["K1519219A"],"award-info":[{"award-number":["K1519219A"]}]},{"name":"Natural Science Foundation of Fujian Province, China","award":["2022J01611"],"award-info":[{"award-number":["2022J01611"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Plants"],"abstract":"<jats:p>To investigate photosynthetic physiological response mechanisms of rice (Oryza sativa L.) seedling leaves under drought stress, a pot experiment with controlled watering was conducted. Four treatments were applied\u2014control (CK), mild drought (LD), moderate drought (MD), and severe drought (SD)\u2014to four cultivars (H17B7, HY3015, LH1H, WNSM) at seedling stage. The results showed that, after drought stress, the morphological indicators and chlorophyll content of the four rice cultivars all showed decreased trend, but a compensatory effect appeared in some varieties under the LD treatment. As drought intensified, the chlorophyll fluorescence induction kinetics (OJIP) curves\u2019 polyphasic rise was inhibited, mainly affecting the J-I and I-P phases. Under SD, the P-phase declined by 44.36%, 36.75%, 32.61% and 50.62% compared with CK, and positive L-band, K-band, and J-band. Chlorophyll fluorescence parameters showed dynamic changes. Most chlorophyll fluorescence parameters (e.g., Fv\/Fm) decreased, whereas TRo\/CSo and DIo\/CSo exhibited cultivar-dependent variations. Principal components of the chlorophyll fluorescence parameters in seedling leaves of the four rice cultivars showed differences and were clearly distinguished. Plant height, chlorophyll content, etc., are highly significantly positively correlated with Fo, DIo\/CSo, etc., as well as chlorophyll content with DIo\/CSo. The OJIP\/JIP-test responses suggest impairment of the PQ pool and downstream electron transport, with the extent of damage varying among cultivars.<\/jats:p>","DOI":"10.3390\/plants15162499","type":"journal-article","created":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T13:11:57Z","timestamp":1787058717000},"page":"2499","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Impact of Drought Stress on Photosynthetic Electron Transport in Rice Seedlings"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-0364-572X","authenticated-orcid":false,"given":"Zhaoqi","family":"Yu","sequence":"first","affiliation":[{"name":"Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China"},{"name":"Cross-Strait Cooperation Base on Agricultural Science and Technology Industry (Membership) Under the Ministry of Science and Technology (MOST), College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jin","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China"},{"name":"Cross-Strait Cooperation Base on Agricultural Science and Technology Industry (Membership) Under the Ministry of Science and Technology (MOST), College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zuxin","family":"Cheng","sequence":"additional","affiliation":[{"name":"Cross-Strait Cooperation Base on Agricultural Science and Technology Industry (Membership) Under the Ministry of Science and Technology (MOST), College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0852-0663","authenticated-orcid":false,"given":"Renye","family":"Wu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China"},{"name":"Cross-Strait Cooperation Base on Agricultural Science and Technology Industry (Membership) Under the Ministry of Science and Technology (MOST), College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haiyong","family":"Weng","sequence":"additional","affiliation":[{"name":"Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China"},{"name":"College of Mechanical and Electrical Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"781","DOI":"10.1007\/s10584-020-02729-y","article-title":"Climate change attribution and the economic costs of extreme weather events: A study on damages from extreme rainfall and drought","volume":"162","author":"Frame","year":"2020","journal-title":"Clim. 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