[P3] Abiotic Stress for Crop Production

[P3-37] Contrasting Rice Cultivars Responses to Increasing CO₂ Levels and Temperature

*Nominated for Presentation Awards

^○Nene Furukawa¹, Murat Aycan², Nahar Lutfun¹, Toshihiro Nagamori¹, Eckart Priesack³, Bertrand Gakière⁴, José Luis Araus⁵, Iker Aranjuelo⁶, Marouane Baslam², Toshiaki Mitsui^1,2 (1.Dept. of Life and Food Sciences, Graduate School of Science and Technology, Niigata University, Japan, 2.Laboratory of Biochemistry, Faculty of Agriculture, Niigata University, Japan, 3.Institute of Biochemical Plant Pathology, Helmholtz Center-Munich, Germany, 4.Institute of Plant Sciences Paris-Saclay (IPS2), CNRS University Paris-Saclay, France, 5.Integrative Crop Ecophysiology group, University of Barcelona, Spain, 6.Agrobiotechnology Institute, Spanish National Research Council, Spain)

The changing global climate is a major threat to rice production. We aim to identify rice crop cultivars management practices conferring high nutrient use efficiency to ensure sustainable agricultural and biomass production adapted to the predicted climate change scenarios. To characterize the crops with higher/lower yield and grain quality characteristics, we investigated the agronomical, physiological, and biochemical response patterns in 10 rice cultivars (selected based on their tolerance/susceptibility under a previous drought field experiment) grown under three conditions of control (CT), high-temperature (HT), and combination of high-temperature + elevated CO₂ (HT+ECO₂). The metric measurements and correlation analyses among the studied traits allowed to systematically break down the divergent behavioral phenotypes of rice genotypes under stressful environment. As a result, the seed-set and yield were reduced while chalkiness increased by high tissue temperature. ECO₂ increases some physiological traits, spikelet, and seed number, while it decreased the grain traits, and can compensate to some extent the temperature, but the HT+ECO₂ undermines the grain characteristics and quality traits.