Photosynthetica 2018, 56(3):911-920 | DOI: 10.1007/s11099-017-0743-y

The impact of elevated CO2 and water deficit stress on growth and photosynthesis of juvenile cacao (Theobroma cacao L.).

F. Lahive1,*, P. Hadley1, A. J. Daymond1
1 School of Agriculture, Policy and Development, University of Reading, Whiteknights, Reading, UK

Atmospheric CO2 concentration continues to rise and is predicted to reach approximately 700 ppm by 2100. Some predictions suggest that the dry season in West Africa could be extended with climate change. This study examined the effects of elevated CO2 concentration and water deficit on growth and photosynthesis of juvenile cacao. Light-saturated photosynthesis (Pmax), quantum efficiency, and intrinsic water-use efficiency increased significantly in response to elevated CO2, as did a range of growth and development responses (e.g. leaf area and leaf number), but the magnitude of the increase was dependent on the water treatment. Stomatal index was significantly greater in the elevated CO2 treatment; an atypical response which may be a reflection of the environment in which cacao evolved. This study shows a positive effect of elevated CO2 on juvenile cacao which may help to alleviate some of the negative impacts of water deficit stress.

Keywords: abiotic stress; climate change; gas exchange; growth; photosynthesis

Received: March 9, 2017; Accepted: May 15, 2017; Prepublished online: September 1, 2018; Published: August 1, 2018Show citation

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Lahive, F., Hadley, P., & Daymond, A.J. (2018). The impact of elevated CO2 and water deficit stress on growth and photosynthesis of juvenile cacao (Theobroma cacao L.). Photosynthetica, 56(3), 911-920. doi: 10.1007/s11099-017-0743-y.
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