关键词: 极端强降水, 极端强降水, 环境参数, 物理量, 水汽, 能量

Abstract: Grain filling stage is the key stage for maize yield and quality formation and this stage suffer waterlogging frequently during summer in South China. The effects of waterlogging during early grain developmental stages (1–7 d after pollination) on grain yield and quality of waxy maize were studied using six varieties as test materials. Results indicated that waterlogging decrease grain number and weight, result in yield loss. Waterlogging decrease starch and soluble sugar contents but increase protein content of grains. Waterlogging also reduce flour peak viscosity and breakdown viscosity of all varieties except Nongkeyu301. Trough, final, and setback viscosities in response to waterlogging were variety dependent. Waterlogging did not affect pasting and gelatinization temperatures. Furthermore, waterlogging decrease gelatinization enthalpy of Wannuo5 and Meiyu16, but this parameter was not affect in other varieties. By contrast, waterlogging increase retrogradation enthalpy and retrogradation percentage of all the varieties except Meiyu16, this yield similar results under the two conditions. In conclusion, waterlogging after pollination decrease the grain yield and deteriorate the grain quality (present as low viscosity and high retrograde).