Year: 1993
Type: article
Abstract: To obtain information for more detailed studies of how rice responds to climate change plants of three high tillering (IR30, IR52, IR74) and two low tillering cultivars (Azuceña and IRAT 104) were grown under controlled environment conditions for 28 days. To detect CO2 responses, plants were grown at 400μL L-1 (ambient) or 700μL L-1 CO2, at 31/26°C and a 13hr photoperiod. To detect temperature responses, plants were grown at 28/22, 31/25, or 34/28°C light/dark temperatures, ambient CO2, and a 13hr photoperiod. Across all rice cultivars, a 300μL L-1 increase in CO2 stimulated root growth more than shoot growth (p<0.05), i. e. a 12 to 54% increase in root weight, 4 to 49% increase in total dry weight, and 10 to 32% increase in root/shoot ratio; but neither leaf nor stem weight and leaf or tiller number was affected by CO2. In contrast, increasing temperature by 6°C for 28/22°C stimulated shoot but inhibited root growth, resulting in an increase (p<0.05) (38 to 69%) in leaf number but a significant decrease (32 to 48%) in root/shoot ratio and nonsignificant changes for other parameters. Cultivars responded similarly to CO2 or temperature; there were no significant CO2 x cultivar or temperature x cultivar interactions. However, rice cultivars responded differently to the same environment; IRAT 104 plants tended to have lower dry weights and tiller numbers than the IR cultivars with Azuceña as intermediate. Azucena had lower root/shoot ratios than the other cultivars.The information in this document has been funded wholly or in part by the U. S. Environmental Protection Agency. It has been subjected to me Agency's peer and administrative review, and it has been approved for publication as an EPA document. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.
Authors: D. Olszyk, C. Wise, W. M. Werakoon
Institutions: Environmental Protection Agency, Oregon State University
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDGs: Zero hunger, Climate action
Open Access status: diamond
OpenAlex ID: W1966164632