Quantitative trait locus analyses of ozone-induced grain yield reduction in rice

► Ozone caused significant leaf lesions in a japonica rice cv. Sasanishiki. ► Total seed weight of an indica rice cv. Habataki was reduced by ozone. ► Ozone also reduced number of primary rachis branch and total spikelet number in Habataki. ► The QTL participating in total seed weight loss by ozone was found on chromosome 6. ► Ozone-exposure decreased APO1 expression level in Habataki.