花后持续遮光15d对香稻产量、品质和香气的影响

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

【目的】探明花后持续遮光15 d对香稻产量、品质和香气特征物质2-乙酰-1-吡咯啉(2-AP)的影响.【方法】以常规香稻品种玉香油占和农香18为材料,进行大田对比试验,设置花后持续遮光15 d处理和正常光照处理,测定了香稻产量、品质和2-乙酰-1-吡咯啉(2-AP)含量等指标.【结果和结论】与正常光照处理相比,花后持续遮光15 d显著提高了籽粒2-AP含量和蛋白质含量,但千粒质量、结实率和产量以及整精米率均显著降低.花后持续遮光15d可以提高香稻香气但会降低产量,对稻米其他品质性状的影响因品种而异.

【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.