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Interactive effects of elevated CO2 concentration and combined heat and drought stress on tomato photosynthesis.
Metadata
Journalbmc plant biology3.497Date
2020 Jun 07
2 months ago
Publication Type
Journal Article
Volume
2020-Jun-07 / 20 : 260
Author
Zhou R 1, Yu X 2, Wen J 2, Jensen NB 3, Dos Santos TM 3, Wu Z 2, Rosenqvist E 4, Ottosen CO 5
Affiliation
  • 2. College of Horticulture, Nanjing Agricultural University, Nanjing, Jiangsu, China.
  • 3. Department of Food Science, Aarhus University, Aarhus, Denmark.
  • 4. Department of Plant and Environmental Sciences, University of Copenhagen, Taastrup, Denmark.
  • 5. Department of Food Science, Aarhus University, Aarhus, Denmark. [email protected]
Doi
PMIDMESH
Abstract
BACKGROUND: Extreme weather events are predicted to increase, such as combined heat and drought. The CO2 concentration ([CO2]) is predicted to approximately double by 2100. We aim to explore how tomato physiology, especially photosynthesis, is affected by combined heat and drought under elevated [CO2] (e [CO2]).
RESULTS: Two genotypes, 'OuBei' ('OB', Solanum lycopersicum) and 'LA2093' (S. pimpinellifolium) were grown at a [CO2] (atmospheric [CO2], 400 ppm) and e [CO2] (800 ppm), respectively. The 27-days-old seedlings were treated at 1) a [CO2], 2) a [CO2] + combined stress, 3) e [CO2] and 4) e [CO2] + combined stress, followed by recovery. The PN (net photosynthetic rate) increased at e [CO2] as compared with a [CO2] and combined stress inhibited the PN. Combined stress decreased the Fv/Fm (maximum quantum efficiency of photosystem II) of 'OB' at e [CO2] and that of 'LA2093' in regardless of [CO2]. Genotypic difference was observed in the e [CO2] effect on the gas exchange, carbohydrate accumulation, pigment content and dry matter accumulation.
CONCLUSIONS: Short-term combined stress caused reversible damage on tomato while the e [CO2] alleviated the damage on photosynthesis. However, the e [CO2] cannot be always assumed have positive effects on plant growth during stress due to increased water consumption. This study provided insights into the physiological effects of e [CO2] on tomato growth under combined stress and contributed to tomato breeding and management under climate change.
Keywords: Combined heat and drought Elevated CO2 concentration Plant physiology Recovery Tomato
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BMC Plant Biolbmc plant biology
Metadata
LocationEngland
FromBMC

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