Photosynthetic light‐use efficiency of rice leaves under fluctuating incident light
Abstract The responsiveness of photosynthesis to continuously fluctuating light intensities can provide an estimate of the net assimilation rate (A) and photosynthetic light‐use efficiency (PLUE), which cannot be measured under steady‐state conditions. This study was conducted to investigate whether...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Agrosystems, Geosciences & Environment |
| Online Access: | https://doi.org/10.1002/agg2.20030 |
| _version_ | 1818408797557751808 |
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| author | Kenichi Tatsumi Yoshiki Kuwabara Takashi Motobayashi |
| author_facet | Kenichi Tatsumi Yoshiki Kuwabara Takashi Motobayashi |
| author_sort | Kenichi Tatsumi |
| collection | DOAJ |
| description | Abstract The responsiveness of photosynthesis to continuously fluctuating light intensities can provide an estimate of the net assimilation rate (A) and photosynthetic light‐use efficiency (PLUE), which cannot be measured under steady‐state conditions. This study was conducted to investigate whether the leaves of rice (Oryza sativa L.) ‘Koshihikari’ and ‘Akitakomachi’ can efficiently utilize light under constantly fluctuating incident photosynthetic photon flux density (PPFD) and also to determine the effect of leaf N concentration on the acclimation of photosynthesis to changing PPFD. To this end, the instantaneous A and continually fluctuating incident PPFD were measured for 16 youngest fully expanded leaves of individual plants from dawn to dusk at the vegetative and reproductive phases under open‐air field conditions using two portable photosynthesis systems. The results revealed that (a) daily PLUE and PLUEPPFDcomp_200 calculated as the slope of the linear regression of A for values of PPFD between the light compensation point and 200 μmol m−2 s−1 can be improved with leaf N; (b) rice leaves do not utilize light efficiently under constantly fluctuating light conditions; and (c) the stomatal conductance per unit PPFD decreases under higher daily incident PPFD and diurnal fluctuation. Overall, our findings will help in refining crop photosynthesis models and would assist with the selection of high‐PLUE lines in breeding programs. |
| first_indexed | 2024-12-14T09:49:26Z |
| format | Article |
| id | doaj.art-abdc79f221614966a6a52179e1c3599c |
| institution | Directory Open Access Journal |
| issn | 2639-6696 |
| language | English |
| last_indexed | 2024-12-14T09:49:26Z |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Agrosystems, Geosciences & Environment |
| spelling | doaj.art-abdc79f221614966a6a52179e1c3599c2022-12-21T23:07:33ZengWileyAgrosystems, Geosciences & Environment2639-66962020-01-0131n/an/a10.1002/agg2.20030Photosynthetic light‐use efficiency of rice leaves under fluctuating incident lightKenichi Tatsumi0Yoshiki Kuwabara1Takashi Motobayashi2Division of Environmental and Agricultural Engineering, Institute of Agriculture Tokyo Univ. of Agriculture and Technology 3‐5‐8 Saiwai‐cho Fuchu Tokyo 183‐8509 JapanField Science Center, Faculty of Agriculture Yamagata University 5‐3 Aza Komashi, Takasaka Tsuruoka Yamagata 997‐0369 JapanDivision of Science of Biological Production, Institute of Agriculture Tokyo University of Agriculture and Technology 3‐5‐8 Saiwai‐cho Fuchu Tokyo 183‐8509 JapanAbstract The responsiveness of photosynthesis to continuously fluctuating light intensities can provide an estimate of the net assimilation rate (A) and photosynthetic light‐use efficiency (PLUE), which cannot be measured under steady‐state conditions. This study was conducted to investigate whether the leaves of rice (Oryza sativa L.) ‘Koshihikari’ and ‘Akitakomachi’ can efficiently utilize light under constantly fluctuating incident photosynthetic photon flux density (PPFD) and also to determine the effect of leaf N concentration on the acclimation of photosynthesis to changing PPFD. To this end, the instantaneous A and continually fluctuating incident PPFD were measured for 16 youngest fully expanded leaves of individual plants from dawn to dusk at the vegetative and reproductive phases under open‐air field conditions using two portable photosynthesis systems. The results revealed that (a) daily PLUE and PLUEPPFDcomp_200 calculated as the slope of the linear regression of A for values of PPFD between the light compensation point and 200 μmol m−2 s−1 can be improved with leaf N; (b) rice leaves do not utilize light efficiently under constantly fluctuating light conditions; and (c) the stomatal conductance per unit PPFD decreases under higher daily incident PPFD and diurnal fluctuation. Overall, our findings will help in refining crop photosynthesis models and would assist with the selection of high‐PLUE lines in breeding programs.https://doi.org/10.1002/agg2.20030 |
| spellingShingle | Kenichi Tatsumi Yoshiki Kuwabara Takashi Motobayashi Photosynthetic light‐use efficiency of rice leaves under fluctuating incident light Agrosystems, Geosciences & Environment |
| title | Photosynthetic light‐use efficiency of rice leaves under fluctuating incident light |
| title_full | Photosynthetic light‐use efficiency of rice leaves under fluctuating incident light |
| title_fullStr | Photosynthetic light‐use efficiency of rice leaves under fluctuating incident light |
| title_full_unstemmed | Photosynthetic light‐use efficiency of rice leaves under fluctuating incident light |
| title_short | Photosynthetic light‐use efficiency of rice leaves under fluctuating incident light |
| title_sort | photosynthetic light use efficiency of rice leaves under fluctuating incident light |
| url | https://doi.org/10.1002/agg2.20030 |
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