多效唑对水稻的生物效应及其应用

 多效唑(Multi-Effect Triazole,MET)是一种新型植物生长延缓物质,对水稻(Oryza sativa L.)生长有明显的控制作用,主要表现于减缓稻苗生长速度和抑制节间伸长;其伴生效应有:促进秧苗分蘖与根系生长,减轻水稻移栽后败苗,增进稻株本田期早发增蘖以及防止水稻成熟期间倒伏。可应用于控制连作晚稻秧苗徒长,调节稻作茬口安排;以及减轻因倒伏引起的产量与品质的下降。多效唑对水稻生长的控制效应受气温、氮素施用量以及土壤水分影响;多效唑具有增强气孔抗阻、降低叶面蒸腾等生理作用,并增强稻苗吲哚乙酸氧化酶活性。

Biological Responses of MET on Rice and Field Applications

MET (Multi-Effect Triazole) is a new-type plant-growth retardant. Spraying MET (300 ppm) to seedling of second crop rice at 1—2 leaf stage showed highly effective in controlling plant height and promoting tillering of rice seedling. The seedlings sprayed with MET would not fade after transplantation. The plant height was reduced as much as 30%.The tillers of seedling was increased as much as 50%. The experiment suggests that applicating MET can control overgrowth of rice seedling in second crop without making double nursery and using later japonica varieties in mechanical transplantation. In addition, several field trials have been conducted to evaluate the effect of foliar application of MET during panicle initiation on lodging and yield components, The experiment results showed MET can be used to reduce lodging and remain good quality of grain. MET enhanced IAA-oxidase activity which may play a part in controlling endogeneous IAA level in growing plants. On the other hand, we observedonclick="SelectDisplayDiv('EnDivSummaryMoreSummary','EnDivSummaryMore');DisplaySpanDiv('EnDivSummaryHuanYuan')"> the antagonism on the growing rice seedlings between MET and nitrogen, high temperature, and water.