Abstract: By spraying polyamines (PAs) synthesis inhibitors, D-Arg, MGBG (Methylglyoxal bis-guanylhydrazone) and CHA (Cyclohexylamine) at various concentrations to panicles and flag leaves of indica rice Jinlingxiangnuo (a higher polyamine rice variety) at heading, flowering and grain filling stages, changes in contents and components of PAs in rice grains after harvest were investigated. The inhibition of D-Arg on the contents of free and conjugated PAs and the total amounts in rice grains treated at the three stages were significant, especially at the flowering and grain filling stages. Treatments with MGBG and CHA mainly affected the components of PAs, and their effects on total amounts of PAs were not significant except for MGBG at the flowering stage and CHA at both heading and flowering stages.

Key words: rice, polyamines synthesis inhibitors, content, regulation

摘要： 以高多胺水稻品种金陵香糯为材料，在抽穗期、开花期和灌浆期用不同浓度的多胺合成抑制剂D精氨酸（DArg）、甲基乙二醛双（鸟苷腙）（MGBG）和环己胺（CHA）喷施穗部和剑叶，研究它们对水稻籽粒中游离态和结合态多胺含量和组成的影响。结果表明，DArg对3个时期水稻籽粒中游离态和结合态各多胺含量及总量均有显著抑制作用，其中开花期和灌浆期处理的效果较明显。MGBG和CHA主要影响籽粒多胺的组成，对多胺总量的影响仅MGBG在开花期、CHA在抽穗期和开花期处理的抑制作用达显著水平。

关键词: 水稻, 多胺合成抑制剂, 含量, 调控