Synergistic regulation of photosynthetic efficiency at physiological and transcriptional levels in Ottelia acuminata under single and combined nitrogen and phosphorus treatments
Bioresource technology, vol.446, pp.134212, 2026 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 446
- Publication Date: 2026
- Doi Number: 10.1016/j.biortech.2026.134212
- Journal Name: Bioresource technology
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, BIOSIS, Chemical Abstracts Core, Compendex, EMBASE, Environment Index, Geobase, INSPEC, MEDLINE
- Page Numbers: pp.134212
- Keywords: Endangered species, Eutrophication, Limiting nutrient, Photosynthesis, Plateau lakes
- Middle East Technical University Affiliated: Yes
Abstract
Eutrophication in plateau lakes is a major global challenge driven by excessive nitrogen (N) and phosphorus (P) inputs ; however, whether N or P is the dominant limiting nutrient remains controversial. To address this issue, we investigated the responses of Ottelia acuminata to different N and P levels using integrated physiological and transcriptomic analyses. Physiological traits and chlorophyll fluorescence parameters exhibited both synergistic and antagonistic responses to N and P treatments. N primarily regulated electron transport efficiency and light energy conversion, whereas P mainly activated photoprotective mechanisms. High P alone and combined N and P treatments inhibited genes related to photosynthetic electron transport, light-harvesting complexes, and pigment metabolism, whereas high N alone upregulated genes involved in pigments, electron transport, ATPase, and the cytochrome b6/f complex. These findings enhance understanding of eutrophication adaptation and growth in O. acuminata and provide nutrient control strategies for endangered species conservation and eutrophication management in plateau lakes.