Expression of NRKe and 9RKe was induced after higher temperature treatment. (a) Expression patterns of NRKe in rice variety Nipponbare and 9RKe in rice variety 93-11 in different temperatures. ck, untreated control. (b) Putative heat-responsive cis-acting elements in the promoter regions of NRKe and 9RKe. HSE (nGAAn core), heat shock element consisting of repeated core sequence of nGAAn in alternate orientation; HSE (PlantCARE), heat shock element found in PlantCARE database; CCAAT box (Place), CCAAT box found in PLACE database.