分蘖期水分对香稻香气及生理特性的影响.docVIP

 分蘖期水分对香稻香气及生理特性的影响# * 5 10 15 20 25 30 35 40 摘要：以常规香稻品种桂香占和美香占为材料,采用盆栽试验,研究了分蘖期水分对香稻香气 及生理特性影响。结果表明,分蘖期土壤水势维持在 0~-25(±5)kpa 时显著增加了两香稻品种 糙米的香气含量，其显著增加了籽粒的游离脯氨酸含量和成熟期叶片、茎鞘和籽粒的脯氨酸 氧化酶活性。分蘖期土壤水势维持在 0~-50(±5)kpa 时降低了两品种籽粒的脯氨酸氧化酶活 性，减少了其糙米的香气含量，显著降低了有效分蘖。因此，适当的分蘖期节水灌溉模式能 有效提高香稻香气含量，而且不影响水稻后期的生理特性；而较强的水分胁迫影响了水稻后 期的生理活性和有效分蘖，减少了香稻 2-AP 的合成与积累。两个水分处理均显著降低分蘖 末期倒二叶相对含水量。 关键词：香稻；水分；香气；脯氨酸；相对含水量 中图分类号：S 511; S 504.8 Effects of Different Irrigation Modes on Aroma Content of Aromatic Rice at Tillering Stage WANG Pei, XIAO Lizhong, TIAN Hua, PAN SHenggang, DUAN Meiyang, TANG Xiangru (College of Agriculture, South China Agricultural University, Guangzhou 510642) Abstract: 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. Key words: aromatic rice; water irrigation ; aroma; proline; relative water content 引言 香稻是栽培稻的一种特殊类型,由于其具有品质