Effects of 15-day continuously shading treatment after flowering on grain yield,quality and aroma of aromatic rice

【Objective】To investigate the effects of 15-day continuously shading treatment after flowering on yield,quality and major aromatic compound 2-acetyl-1-pyrroline( 2-AP). 【Method】Two conventional aromatic rice cultivars of Yuxiangyouzhan and Nongxiang18 were treated by 15-day continuously shading after flowering and natural light in the field. The yield,quality,2-acetyl-1-pyrroline content and other indexes of aromatic rice were measured.【Result and conclusion】The results showed that compared with natural light,the 15-day continuously shading treatment after flowering significantly increased the contents of 2-acetyl-1-pyrroline and protein in grains,and significantly decreased 1000-grain mass,seed setting rate and yield as well as head rice rate. Therefore,low-light stress plays a positive role in the aroma enhancement of aromatic rice but leads to a yield reduction. The effects of shading on other grain quality traits are different due to different varieties.