Grain weight and the concentrations of phenylpropanoid glycosides and ??oryzanol in response to heat stress during ripening in rice

Background and objectives Grain weight decreases by heat stress during ripening in rice. Phenylpropanoid glycosides ?-oryzanol are biomarkers for stress. The relationships between grain the concentrations of these compounds should be understood order to use improve tolerance In present study, we aimed determine japonica cultivar Koshihikari indica Takanari. Findings Koshihikari, 3',6-di-O-sinapoylsucrose, 24-methylenecycloartanyl ferulate, total had strong negative correlations with weight. Conversely, Takanari, 3',6-di-O-sinapoylsucrose 3'-O-sinapoyl-6-O-feruloylsucrose weight, whereas those 3',6-di-O-feruloylsucrose cycloartenyl ferulate positive Interestingly, appeared stronger than Conclusions metabolisms may strongly correlated reduction caused Koshihikari. Significant novelty powerful tools improving cultivars.