Effects of elevated carbon dioxide and temperature on chlorophyll, leaf area and yield of rice cultivar RD43
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Abstract
The rise of carbon dioxide and temperature leads global climate change and causes adverse effects on the environment. The purpose of this study is to investigate the response of rice RD43 to carbon dioxide and temperature increases, along with the combined effects of the elevated carbon dioxide and temperature. The research was conducted in 4 treatments: elevated carbon dioxide (EC:600), the combined elevated carbon dioxide and temperature (ECT:600+3C), elevated temperature (ET:+3C) and a control group (C:400) to evaluate chlorophyll, leaf area, biomass and yield. It was found that EC:600 caused more chlorophyll and leaf area than all three experimental sets with statistical significance, while ET caused both chlorophyll and leaf area decreased significantly when compared with C:400. Total biomass was the highest in the EC:600 experiment set, followed by ECT:600+3C, C:400 and ET:+3C by 86.87, 79.15, 72.12 and 53.98 g, respectively. In terms of productivity, rice RD43 has 43.33 tillers and 114.56 grains per panicle in EC:600 experiment group, which is more than those other experiment series, while ET:+3C treatment caused the tiller number and number of grains per panicle to decrease statistically significantly. The atmospheric levels of carbon dioxide are expected to increase in future and the effective nitrogen management and other growth conditions will assist in reducing the effects of heat stress together with plant stress such as drought and air pollution.
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