Elevated temperature and carbon dioxide alter resource allocation to growth, storage and defence in cassava (Manihot esculenta)

Forbes, Samantha J., Cernusak, Lucas A., Northfield, Tobin D., Gleadow, Roslyn M., Lambert, Smilja, and Cheesman, Alexander W. (2020) Elevated temperature and carbon dioxide alter resource allocation to growth, storage and defence in cassava (Manihot esculenta). Environmental and Experimental Botany, 173. 103997.

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Abstract

Rising atmospheric CO2 concentrations and global warming can alter how plants partition their resources. This is important for food crops through changes in resource allocation to edible tissues and toxic defence compounds. While research suggests elevated temperature and [CO2] independently drive changes in plant metabolism and stress levels, and photosynthetic rates, respectively, it is less clear how these environmental changes impact plants when combined. Cassava is an important dietary staple for many developing nations. However, the safety of cassava depends on cyanogenic glucoside concentrations. In a climate-controlled greenhouse, the effects of elevated temperature in the presence and absence of elevated [CO2] on the growth, physiology and chemical defence of cassava at two growth stages were examined. Growth in cassava was initially increased by elevated temperature. However, across time, simultaneous elevated [CO2] led to an increasing biomass advantage over plants grown at ambient [CO2] and temperature. Elevated temperature and [CO2] also significantly increased tuber initiation and early tuber expansion. Tuber and leaf cyanide concentrations were significantly reduced under elevated temperature, while elevated temperature and [CO2] produced tuber cyanide concentrations similar to the higher levels found in plants grown at ambient conditions. The findings highlight how future climate change may impact both cassava production and quality.

Item ID: 65826
Item Type: Article (Research - C1)
ISSN: 1873-7307
Keywords: Climate change; Cyanogenic glucosides; Global food security; Major staple crops; Plant defence; Resource partitioning
Copyright Information: © 2020 Elsevier B.V. All rights reserved.
Funders: Mars Incorporated (MI)
Date Deposited: 09 Feb 2021 04:40
FoR Codes: 31 BIOLOGICAL SCIENCES > 3108 Plant biology > 310806 Plant physiology @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960806 Forest and Woodlands Flora, Fauna and Biodiversity @ 100%
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