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Effects of Elevated Temperature and CO2 on Biomass and Sucrose Accumulation of Selected Sugarcane Genotypes

Authors:

A. L. C. De Silva ,

University of Peradeniya, Peradeniya, LK
About A. L. C.
Postgraduate Institute of Agriculture
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W. A. J. M. De Costa,

University of Peradeniya, Peradeniya, LK
About W. A. J. M.

Postgraduate Institute of Agriculture

 

Department of Crop Science, Faculty of Agriculture, University of Peradeniya, Peradeniya

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L. D. B. Suriyagoda

University of Peradeniya, Peradeniya, LK
About L. D. B.

Postgraduate Institute of Agriculture

Department of Crop Science, Faculty of Agriculture, University of Peradeniya, Peradeniya

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Abstract

Global warming cause due by increasing atmospheric CO2 concentration, and the resulting increase in air temperature is a considerable challenge in crop production. Hence, the objectives of this study were to determine the: (a) responses of biomass and sucrose accumulation of sugarcane to elevated CO2 (ECO2) and elevated temperature (ETa), both individually and together, and (b) genotypic variation of these responses. A three-factor factorial experiment considering the combination of CO2 concentrations and temperatures as the main-plot factor and eight sugarcane varieties as the sub-plot factor arranged in a split-plot design in open-top chambers. Plots in open field conditions were the negative control. The main plot factor had four levels, combinations of ambient/elevated CO2 concentrations (344-351/777-779 ppm) and ambient/elevated temperatures (34.9-35.6/36.6-38.4°C). Significant treatment × variety interaction effects observed on the number of shoots per hill, sucrose% (Pol), and pure obtainable cane sugar (POCS) in cane juice. Genotypic variations were significant in all variables measured. Elevated Ta increased the number of shoots per hill in 4 out of 8 varieties. Biomass accumulation of sugarcane on the dry weight basis did not respond clearly to the simulated future climatic conditions. The response of Pol and POCS to ECO2 and the combination of ECO2 and ETa varied depending on varieties with decreased, increased, or no response. Notably, Pol and POCS in the variety SL88116, which had higher respective values at ambient and simulated future climatic conditions, were not affected by either ECO2 or ETa individually or in combination. The responses and the significant genotypic variation observed in sucrose accumulation to ECO2 and ETa, both individually and together, demonstrate considerable scope in sugarcane to breed varieties to maintain the stability of sugar recovery in CO2-rich warm climates.
How to Cite: De Silva, A.L.C., De Costa, W.A.J.M. and Suriyagoda, L.D.B., 2021. Effects of Elevated Temperature and CO2 on Biomass and Sucrose Accumulation of Selected Sugarcane Genotypes. Tropical Agricultural Research, 33(1), pp.67–79. DOI: http://doi.org/10.4038/tar.v33i1.8536
Published on 29 Dec 2021.
Peer Reviewed

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