Abstract: 【Objective】To determine the effect of reduced glutenin content on starch grain structure and RVA（rapid viscosity analyzer）spectrum characteristics.【Methods】 Investigate the effect of reduced glutenin content on grain structure and starch RVA spectrum characteristics by the Scanning Electron Microscope（SEM） and viscosity analyzer.【Results】Compared with the background parent Shengdao 735,the plant height of Shengdao LG03 was reduced,the number of grains per panicle was slightly reduced,the total protein content was reduced,and there were no significant differences in other agronomic traits.Compared with Shengdao 735,new low-gluten content Shengdao LG03 had no significant change on the morphology of starch granules,but the size uniformity was reduced,and starch RVA curve showed that peak viscosity（PKV）,hot paste viscosity（HPV）,cool paste viscosity（CPV）,breakdown viscosity（BDV）,pasting temperature（PaT）and peak time（PeT）all had downward trend,while consistence viscosity（CSV）and setback viscosity（SBV）increased.【Conclusion】 The decrease of gluten content had little effect on the morphology of rice starch granules,but the uniformity of particle size was reduced,that may be the reason of the changes of starch RVA characteristic values.

Key words: Low glutelin protein, Starch granules, Starch RVA spectrum