分蘖期水分对香稻香气及生理特性的影响

Effects of different irrigation modes on aroma content and Physiological Characteristics in brown rice were studied in pots by using Guixiangzhan and Meixiangzhan of the conventional aromatic rice for material at tillering Stage. The results showed that the soil water potential maintained at 0 ~-25(±5)kPa could significantly improve free proline content of grains and proline oxidase activit of rice leaves, stems and grains which further significantly improve the aroma content of brown rice in both varieties. The soil water potential maintained at 0~-50(±5)kPa could reduce proline oxidase activit of grains and decrease the aroma content of brown rice; meanwhile, significantly reduced the effective tillering. Therefore, appropriate water saving irrigation could effectively improve the aroma content of aromatic rice at tillering stage and don't affect the physiological characteristics during the late growth period of rice;while, high-intensity water stress could affect the physiological activity and effective tillering, and reduced the formation and accumulation of 2-AP in the later growth process. Two irrigation modes significantly reduced the second leaf relative water content in late tillering stage.