Rapid Light-Response Curve of Chlorophyll Fluorescence in Terrestrial Plants: Relationship to CO<sub>2</sub> Exchange among Five Woody and Four Fern Species Adapted to Different Light and Water Regimes
The rapid light response of electron transport rate (<i>ETR</i><sub>R</sub>), 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. Ho...
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MDPI AG
2021-02-01
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| Online Access: | https://www.mdpi.com/2223-7747/10/3/445 |
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| author | Meng-Yuan Huang Shau-Lian Wong Jen-Hsien Weng |
| author_facet | Meng-Yuan Huang Shau-Lian Wong Jen-Hsien Weng |
| author_sort | Meng-Yuan Huang |
| collection | DOAJ |
| description | The rapid light response of electron transport rate (<i>ETR</i><sub>R</sub>), 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 <i>ETR</i><sub>R</sub> and the steady-state light response of CO<sub>2</sub> exchange rate (<i>A</i><sub>S</sub>) of terrestrial plants has not been studied in detail. In this study, we compared the <i>ETR</i><sub>R</sub> and <i>A</i><sub>S</sub> 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 (<i>g</i><sub>s</sub>) not being a main limiting factor for photosynthesis, <i>ETR</i><sub>R</sub> and <i>A</i><sub>S</sub> 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 <i>Alnus formosana</i> was treated with low soil water and air humidity, because of the decrease in <i>A</i><sub>S</sub> mainly due to stomatal closure, the <i>ETR</i><sub>R</sub>–<i>A</i><sub>S</sub> relation was not so close. In addition, at both 100 and 2000 μmol m<sup>−2</sup> s<sup>−1</sup> photosynthetic photon flux density (PPFD), <i>ETR</i><sub>R</sub> and <i>A</i><sub>S</sub> were significantly correlated within a plant group (i.e., woody plants and ferns) regardless of the broad difference in <i>A<sub>S</sub></i> due to different species or environmental factors. The results indicate that the relationship between the <i>ETR</i><sub>R</sub> and <i>A</i><sub>S</sub> is varied by species. We concluded that 1) ETR<sub>R</sub> could reflect the variation in <i>A</i><sub>S</sub> at each irradiance level within a species under well-watered conditions and 2) <i>ETR</i><sub>R</sub> at 100 μmol m<sup>−2</sup> s<sup>−1</sup> PPFD (as the efficiency of light capture) or 2000 μmol m<sup>−2</sup> s<sup>−1</sup> PPFD (as a maximum photosynthetic parameter) could be used to compare the photosynthetic capacity within a plant group, such as woody plants and ferns. |
| first_indexed | 2024-03-09T00:29:09Z |
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| spelling | doaj.art-2876d185d2bf4cfcb2cb418c7db602772023-12-11T18:36:41ZengMDPI AGPlants2223-77472021-02-0110344510.3390/plants10030445Rapid Light-Response Curve of Chlorophyll Fluorescence in Terrestrial Plants: Relationship to CO<sub>2</sub> Exchange among Five Woody and Four Fern Species Adapted to Different Light and Water RegimesMeng-Yuan Huang0Shau-Lian Wong1Jen-Hsien Weng2Department of Life Sciences, National Chung-Hsing University, Taichung 40227, TaiwanDivision of Botany, Endemic Species Research Institute, Nantou 552, TaiwanDepartment of Life Sciences, National Chung-Hsing University, Taichung 40227, TaiwanThe rapid light response of electron transport rate (<i>ETR</i><sub>R</sub>), 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 <i>ETR</i><sub>R</sub> and the steady-state light response of CO<sub>2</sub> exchange rate (<i>A</i><sub>S</sub>) of terrestrial plants has not been studied in detail. In this study, we compared the <i>ETR</i><sub>R</sub> and <i>A</i><sub>S</sub> 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 (<i>g</i><sub>s</sub>) not being a main limiting factor for photosynthesis, <i>ETR</i><sub>R</sub> and <i>A</i><sub>S</sub> 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 <i>Alnus formosana</i> was treated with low soil water and air humidity, because of the decrease in <i>A</i><sub>S</sub> mainly due to stomatal closure, the <i>ETR</i><sub>R</sub>–<i>A</i><sub>S</sub> relation was not so close. In addition, at both 100 and 2000 μmol m<sup>−2</sup> s<sup>−1</sup> photosynthetic photon flux density (PPFD), <i>ETR</i><sub>R</sub> and <i>A</i><sub>S</sub> were significantly correlated within a plant group (i.e., woody plants and ferns) regardless of the broad difference in <i>A<sub>S</sub></i> due to different species or environmental factors. The results indicate that the relationship between the <i>ETR</i><sub>R</sub> and <i>A</i><sub>S</sub> is varied by species. We concluded that 1) ETR<sub>R</sub> could reflect the variation in <i>A</i><sub>S</sub> at each irradiance level within a species under well-watered conditions and 2) <i>ETR</i><sub>R</sub> at 100 μmol m<sup>−2</sup> s<sup>−1</sup> PPFD (as the efficiency of light capture) or 2000 μmol m<sup>−2</sup> s<sup>−1</sup> PPFD (as a maximum photosynthetic parameter) could be used to compare the photosynthetic capacity within a plant group, such as woody plants and ferns.https://www.mdpi.com/2223-7747/10/3/445electron transport ratefernphotosynthetic raterapid light curvestomatal conductancetree |
| spellingShingle | Meng-Yuan Huang Shau-Lian Wong Jen-Hsien Weng Rapid Light-Response Curve of Chlorophyll Fluorescence in Terrestrial Plants: Relationship to CO<sub>2</sub> Exchange among Five Woody and Four Fern Species Adapted to Different Light and Water Regimes Plants electron transport rate fern photosynthetic rate rapid light curve stomatal conductance tree |
| title | Rapid Light-Response Curve of Chlorophyll Fluorescence in Terrestrial Plants: Relationship to CO<sub>2</sub> Exchange among Five Woody and Four Fern Species Adapted to Different Light and Water Regimes |
| title_full | Rapid Light-Response Curve of Chlorophyll Fluorescence in Terrestrial Plants: Relationship to CO<sub>2</sub> Exchange among Five Woody and Four Fern Species Adapted to Different Light and Water Regimes |
| title_fullStr | Rapid Light-Response Curve of Chlorophyll Fluorescence in Terrestrial Plants: Relationship to CO<sub>2</sub> Exchange among Five Woody and Four Fern Species Adapted to Different Light and Water Regimes |
| title_full_unstemmed | Rapid Light-Response Curve of Chlorophyll Fluorescence in Terrestrial Plants: Relationship to CO<sub>2</sub> Exchange among Five Woody and Four Fern Species Adapted to Different Light and Water Regimes |
| title_short | Rapid Light-Response Curve of Chlorophyll Fluorescence in Terrestrial Plants: Relationship to CO<sub>2</sub> Exchange among Five Woody and Four Fern Species Adapted to Different Light and Water Regimes |
| title_sort | rapid light response curve of chlorophyll fluorescence in terrestrial plants relationship to co sub 2 sub exchange among five woody and four fern species adapted to different light and water regimes |
| topic | electron transport rate fern photosynthetic rate rapid light curve stomatal conductance tree |
| url | https://www.mdpi.com/2223-7747/10/3/445 |
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