分蘖期水分对香稻香气及生理特性的影响

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的影响。结果表明,分蘖期土壤水势维持在0～(-25±5)kPa时,显著增加了二香稻品种糙米的香气成分和籽粒的游离脯氨酸以及成熟期叶片、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,降低了二品种籽粒脯氨酸氧化酶活性、糙米的香气成分和有效分蘖。因此,适当的分蘖期节水灌溉模式能有效提高香稻香气成分,且不影响水稻后期生理特性。

Effects of Different Irrigation Modes on Aroma Content of Aromatic Rice at Tillering Stage

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 maintaining at 0-(-25±5)kPa could significantly increase free proline content of grains and proline oxidase activit of rice leaves,stems and grains which could further significantly increase the aroma content of brown rice in both varieties.The soil water potential maintaining at 0-(-50±5)kPa could reduce proline oxidase activity of grains,the aroma content of brown rice and the effective tillering.Therefore,appropriate water saving irrigation could effectively improve the aroma content of aromatic rice at tillering stage and not affect the physiological characteristics during the late growth period of rice.