Abstract: An experiment was conducted to investigate the types,components,and contents of polyamines in grains of two rice varieties,IR24(Oryza sativa subsp.indica) and Asominori(Oryza sativa subsp.japonica) under FACE(free air CO2enrichment) and storage treatments.There was no obvious difference in total polyamines in grains between two varieties under natural ambient conditions.FACE treatment reduced the total polyamine contents in Asominori,but did not affect those in IR24,resulting in higher polyamine contents in IR24 than in Asominori.The total polyamine contents in IR24 grains decreased after being stored for one year under natural ambient conditions.The content of bound type polyamines was more than half of total polyamines in IR24 and Asominori,and spermidine(Spd) was major bound polyamines.FACE treatment decreased bound-Spd and increased conjugated-Spd in the grains of two varieties.The FACE effects were dissolved after storage for one year.

Key words: free air CO2 enrichment, polyamines, rice, grain, storage

摘要： 以籼稻品种IR24和粳稻品种Asominori 为材料，比较分析了自由空气CO2浓度升高（free air CO2 enrichment, FACE）和储藏1年，对籽粒内游离态、结合态和束缚态3种类型多胺及其组分、含量的影响。在正常空气条件下，籼、粳稻籽粒中的多胺总量不存在显著差异；FACE处理降低了Asominori 籽粒多胺总量，但对IR24 影响不明显，因此FACE条件下IR24籽粒的多胺总量高于Asominori。储藏1年后，籽粒多胺总量呈下降趋势，其中正常空气条件下生长的IR24籽粒多胺总量显著下降。两水稻品种籽粒中的束缚态多胺总量明显高于游离态和结合态多胺，占总量的50%以上，而在束缚态多胺组分中，亚精胺（Spd）所占比例最大。 FACE处理降低了籽粒中的束缚态Spd含量，增加了结合态Spd含量，而这些FACE效应经籽粒储藏后消失。

关键词: 大气二氧化碳浓度升高, 多胺, 水稻, 籽粒, 储藏