Relationship between allocation of absorbed light energy in PSII and photosynthetic rates of C3 and C4 plants

• Autorzy: Weng J.-H.
• Języki publikacji: EN

Abstrakty

EN

Two C₃ dicotyledonous crops and five C₄ monocotyledons treated with three levels of nitrogen were used to evaluate quantitatively the relationship between the allocation of absorbed light energy in PSII and photosynthetic rates (PN) in a warm condition (25–26°C) at four to five levels [200, 400, 800, 1,200 (both C₃ and C₄) and 2,000 (C₄ only) lmol m⁻² s⁻¹] of photosynthetic photon flux density (PPFD). For plants of the same type (C₃ or C₄), there was a linear positive correlation between the fraction of absorbed light energy that was utilized in PSII photochemistry (P) and PN, regardless of the broad range of their photosynthetic rates due to species-specific effect and/or nitrogen application; meanwhile, the fraction of absorbed light energy that was dissipated through non-photochemical quenching (D) showed a negative linear regression with PN for each level of PPFD. The intercept of regression lines between P and PN of C₃ and C₄ plants decreased, and that between D and PN increased with increasing PPFD. With P and D as the main components of energy dissipation and complementary to each other, the fraction of excess absorbed light energy (E) was unchanged by PN under the same level of PPFD. At the same level of PN, C₄ plants had lower P and higher D than C₃ plants, due to the fact that C₄ plants with little or no photorespiration is considered a limited energy sink for electrons. Nevertheless there was a significant negative linear correlation between D and P when data from both C₃ and C₄ plants at varied PPFD levels was merged. The slope of regression lines between P and D was 0.85, indicating that in plants of both types, most of the unnecessary absorbed energy (ca. 85%) could dissipate through non-photochemical quenching, when P was inhibited by low PN due to species-specific effect and nitrogen limitation at all levels of illumination used in the experiment.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2009
• Tom: 31
• Numer: 3
• Opis fizyczny: p.639-647,fig.,ref.

Twórcy

autor

Weng J.-H.

• Graduate Institute of Ecology and Evolutionary Biology, China Medical University, Taichung, Taiwan
• Department of Life Science, National Chung-Hsing University, Taichung, Taiwan

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