Combining effects of ozone and carbon dioxide application on photosynthesis of Thai jasmine rice (Oryza sativa L.) cultivar Khao Dawk Mali 105
Year: 2016
Type: article
Abstract: This research investigated the effects of elevated ozone and carbon dioxide on photosynthesis of rice (Oryza sativa L.) cultivar Khao Dawk Mali 105.Seedlings were kept in indoor climate control chambers which were set to typically background level of ozone (<10 ppb) by passing inlet air from outside through charcoal filter prior to enter to the chambers.Plant samples were fumigated by ozone concentration level at 40 ppb, 70 ppb and carbon dioxide concentration level at 700 ppm.For combined effects, elevated carbon dioxide concentration 700 ppm was given into two combination treatments of ozone concentration level at 40 and 70 ppb.Control groups were grown in charcoal-filter chambers with no additional ozone.Plant samples then were fumigated with ozone and carbon dioxide for 28 days at tillering stage (at the rice age of 42 to 70 days), and analyzed weekly for photosynthesis rate, leaf chlorophyll, total soluble sugar and biomass.The results showed that ozone significantly caused reduction in photosynthesis, leaf chlorophyll, total soluble sugar and total biomass of rice.The ozone concentration level of 70 ppb significantly (p ≤ 0.05) affected rice more than 40 ppb treatment.Nevertheless, elevated carbon dioxide reduced the negative effects of ozone from both ozone concentration levels.Moreover, higher photosynthesis was observed in combined treatment, when compared with the control group.Finally, increasing of ozone caused reduction in rice photosynthesis; however, elevated carbon dioxide could significantly adverse the effects of ozone.
Institution: Naresuan University
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDGs: Zero hunger, Climate action
Open Access status: bronze
OpenAlex ID: W2405445592