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Article

Rapid Light-Response Curve of Chlorophyll Fluorescence in Terrestrial Plants: Relationship to CO2 Exchange among Five Woody and Four Fern Species Adapted to Different Light and Water Regimes

1
Department of Life Sciences, National Chung-Hsing University, Taichung 40227, Taiwan
2
Division of Botany, Endemic Species Research Institute, Nantou 552, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Carmen Arena
Plants 2021, 10(3), 445; https://doi.org/10.3390/plants10030445
Received: 29 January 2021 / Revised: 23 February 2021 / Accepted: 23 February 2021 / Published: 26 February 2021
The rapid light response of electron transport rate (ETRR), obtained from chlorophyll fluorescence parameters by short illumination periods (10–30 s) at each light level, can provide a rapid and easy measurement of photosynthetic light response in plants. However, the relationship between ETRR and the steady-state light response of CO2 exchange rate (AS) of terrestrial plants has not been studied in detail. In this study, we compared the ETRR and AS for five woody and four fern species with different light and/or water adaptations. Under well-watered conditions, a constant temperature (25 °C) and with stomatal conductance (gs) not being a main limiting factor for photosynthesis, ETRR and AS were closely related, even when merging data for regression analysis for a species grown under different light conditions and measured under different light intensity and air humidity. However, when Alnus formosana was treated with low soil water and air humidity, because of the decrease in AS mainly due to stomatal closure, the ETRRAS relation was not so close. In addition, at both 100 and 2000 μmol m−2 s−1 photosynthetic photon flux density (PPFD), ETRR and AS were significantly correlated within a plant group (i.e., woody plants and ferns) regardless of the broad difference in AS due to different species or environmental factors. The results indicate that the relationship between the ETRR and AS is varied by species. We concluded that 1) ETRR could reflect the variation in AS at each irradiance level within a species under well-watered conditions and 2) ETRR at 100 μmol m−2 s−1 PPFD (as the efficiency of light capture) or 2000 μmol m−2 s−1 PPFD (as a maximum photosynthetic parameter) could be used to compare the photosynthetic capacity within a plant group, such as woody plants and ferns. View Full-Text
Keywords: electron transport rate; fern; photosynthetic rate; rapid light curve; stomatal conductance; tree electron transport rate; fern; photosynthetic rate; rapid light curve; stomatal conductance; tree
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MDPI and ACS Style

Huang, M.-Y.; Wong, S.-L.; Weng, J.-H. Rapid Light-Response Curve of Chlorophyll Fluorescence in Terrestrial Plants: Relationship to CO2 Exchange among Five Woody and Four Fern Species Adapted to Different Light and Water Regimes. Plants 2021, 10, 445. https://doi.org/10.3390/plants10030445

AMA Style

Huang M-Y, Wong S-L, Weng J-H. Rapid Light-Response Curve of Chlorophyll Fluorescence in Terrestrial Plants: Relationship to CO2 Exchange among Five Woody and Four Fern Species Adapted to Different Light and Water Regimes. Plants. 2021; 10(3):445. https://doi.org/10.3390/plants10030445

Chicago/Turabian Style

Huang, Meng-Yuan; Wong, Shau-Lian; Weng, Jen-Hsien. 2021. "Rapid Light-Response Curve of Chlorophyll Fluorescence in Terrestrial Plants: Relationship to CO2 Exchange among Five Woody and Four Fern Species Adapted to Different Light and Water Regimes" Plants 10, no. 3: 445. https://doi.org/10.3390/plants10030445

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