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פותח על ידי קלירמאש פתרונות בע"מ -
CO2 uptake and fluorescence responses for a shade‐tolerant cactus Hylocereus undatus under current and doubled CO2 concentrations
Year:
1995
Source of publication :
Physiologia Plantarum
Authors :
רווה, ערן
;
.
Volume :
93
Co-Authors:
Raveh, E., Dept of Life Sciences, Ben Gurion Univ, Beer-Sheva, 84105, Israel
Gersani, M., Dept of Life Sciences, Ben Gurion Univ, Beer-Sheva, 84105, Israel
Nobel, P.S., UCLA, DOE Laboratory, Dept of Biology, Univ. of California, Los Angeles, California, 90024-1786, United States
Facilitators :
From page:
505
To page:
511
(
Total pages:
7
)
Abstract:
Hylocereus undatus (Haworth) Britton and Rose growing in controlled environment chambers at 370 and 740 μmol CO2 mol−1 air showed a Crassulacean acid metabolism (CAM) pattern of CO2 uptake, with 34% more total daily CO2 uptake under the doubled CO2 concentration and most of the increase occurring in the late afternoon. For both CO2 concentrations, 90% of the maximal daily CO2 uptake occurred at a total daily photosynthetic photon flux density (PPFD) of only 10 mol m−2 day−1 and the best day/night air temperatures were 25/15°C. Enhancement of the daily net CO2 uptake by doubling the CO2 concentration was greater under the highest PPFD (30 mol m−2 day−1) and extreme day/night air temperatures (15/5 and 45/35°C). After 24 days of drought, daily CO2 uptake under 370 μmol CO2 mol−1 was 25% of that under 740 μmol CO2 mol−1. The ratio of variable to maximal chlorophyll fluorescence (Fy/Fm) decreased as the PPFD was raised above 5 mol m−2 day−1, at extreme day/night temperatures and during drought, suggesting that stress occurred under these conditions. Fv/Fm was higher under the doubled CO2 concentration, indicating that the current CO2 concentration was apparently limiting for photosynthesis. Thus net CO2 uptake by the shade‐tolerant H. undatus, the photosynthetic efficiency of which was greatest at low PPFDs. showed a positive response to doubling the CO2 concentration, especially under stressful environmental conditions. Copyright © 1995, Wiley Blackwell. All rights reserved
Note:
Related Files :
Chlorophyll fluorescence
CO2 uptake
Crassulacean acid metabolism
Elevated CO2
Hylocereus undatus
עוד תגיות
תוכן קשור
More details
DOI :
10.1111/j.1399-3054.1995.tb06850.x
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
24032
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:04
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Scientific Publication
CO2 uptake and fluorescence responses for a shade‐tolerant cactus Hylocereus undatus under current and doubled CO2 concentrations
93
Raveh, E., Dept of Life Sciences, Ben Gurion Univ, Beer-Sheva, 84105, Israel
Gersani, M., Dept of Life Sciences, Ben Gurion Univ, Beer-Sheva, 84105, Israel
Nobel, P.S., UCLA, DOE Laboratory, Dept of Biology, Univ. of California, Los Angeles, California, 90024-1786, United States
CO2 uptake and fluorescence responses for a shade‐tolerant cactus Hylocereus undatus under current and doubled CO2 concentrations
Hylocereus undatus (Haworth) Britton and Rose growing in controlled environment chambers at 370 and 740 μmol CO2 mol−1 air showed a Crassulacean acid metabolism (CAM) pattern of CO2 uptake, with 34% more total daily CO2 uptake under the doubled CO2 concentration and most of the increase occurring in the late afternoon. For both CO2 concentrations, 90% of the maximal daily CO2 uptake occurred at a total daily photosynthetic photon flux density (PPFD) of only 10 mol m−2 day−1 and the best day/night air temperatures were 25/15°C. Enhancement of the daily net CO2 uptake by doubling the CO2 concentration was greater under the highest PPFD (30 mol m−2 day−1) and extreme day/night air temperatures (15/5 and 45/35°C). After 24 days of drought, daily CO2 uptake under 370 μmol CO2 mol−1 was 25% of that under 740 μmol CO2 mol−1. The ratio of variable to maximal chlorophyll fluorescence (Fy/Fm) decreased as the PPFD was raised above 5 mol m−2 day−1, at extreme day/night temperatures and during drought, suggesting that stress occurred under these conditions. Fv/Fm was higher under the doubled CO2 concentration, indicating that the current CO2 concentration was apparently limiting for photosynthesis. Thus net CO2 uptake by the shade‐tolerant H. undatus, the photosynthetic efficiency of which was greatest at low PPFDs. showed a positive response to doubling the CO2 concentration, especially under stressful environmental conditions. Copyright © 1995, Wiley Blackwell. All rights reserved
Scientific Publication
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