Mode of action of rice allelochemical, momilactone on the allelopathic activity

许多国家的大型田间筛选项目和实验室实验表明，水稻具有化感作用，并向其环境释放化感化学物质。许多化合物已被确定为潜在的水稻化感物质。然而，我们发现与唇丹相关的二萜内酯A和B可能是最重要的水稻化感化学物质。水稻植物在其整个生命周期中以植物毒性水平从根部向周围环境分泌momilactone A和B，其中momilactone B似乎是观察到的水稻化感作用的主要原因。此外，遗传学研究表明，微内酯不影响赤霉素相关基因的表达。然而，拟南芥SALK T-DNA插入系中出现了一些莫内酯不敏感和超敏感突变体。此外，莫内酯A和B影响了拟南芥中糖酵解和活性氧去除相关蛋白的表达。

Large field screening programs and laboratory experiments in many countries have indicated that rice is allelopathic and releases allelochemical(s) into its environment. A number of compounds have been identified as potential rice allelochemicals. However, we found that the labdane-related diterpenoid momilactone A and B are probably the most important rice allelochemicals. Rice plants secreted momilactone A and B from their roots into the neighboring environments over their entire life cycle at phytotoxic levels, and momilactone B seems to account for the majority of the observed rice allelopathy. In addition, genetic studies have shown that momitlactones do not affect the expression of gibberellin related gens. However, there were some momilactone insensitive and hyper-sensitive mutants in SALK T-DNA Insertion line of Arabidopsis. In addition, momitactone A and B affected the protein expressions in Arabidopsis related to glycolysis and removal of reactive oxygen species.