不同浓度烯效唑及其施用方法对烟草漂浮苗生长的影响  

Effects of Uniconazole Concentration and Applying Method on Growth of Tobacco Seedlings in Floating System

作　　者：李宇[1] 赵松义 聂明建[1] 杨虹琦[1,2] 彭细桥[1] 尹莉丽[1] 

机构地区：[1]湖南农业大学烟草科技与健康重点实验室、农学院,长沙市410128 [2]中国烟草中南农业试验站,长沙市410128

出　　处：《烟草科技》2013年第5期68-71,共4页Tobacco Science & Technology

基　　金：湖南省烟草公司资助项目“提高湖南工厂化育苗质量及效益新技术研究”(合同号11-13Aa10)

摘　　要：为明确烯效唑在培育烤烟壮苗中的应用效果,采用7种烯效唑浓度和两种施用方式,研究了烯效唑对烟苗根系、地上部生长发育及生理指标的影响。结果表明:基质中拌入烯效唑对烟苗地上部生长具有显著的抑制作用,与对照相比,烯效唑处理烟苗根冠比平均提高了128.2%,根系活力平均提高130.7%。叶面喷施不同浓度烯效唑表现为随浓度增加烟苗株高明显降低,但对烟苗茎围、鲜质量、干质量、叶绿素含量、根系活力和硝酸还原酶活性的影响均表现为"低促高抑"效应。其中适宜的浓度为20 mg/L,此浓度喷施烟苗后根冠比为0.105,叶绿素含量增加12.28%,根系活力和硝酸还原酶活性分别增加38.39%和154.33%。烟苗长至"5叶1心"时叶面喷施20 mg/L浓度的烯效唑可促进壮苗形成。In order to investigate the effect of Uniconazole application on tobacco seedling growth, the effects of Uniconazole application, at 7 concentration levels with 2 methods, on the root system, shoot growth and physiological indexes of tobacco seedlings in floating system were studied. The results showed that the matrix mixed with Uniconazole significantly inhibit the shoot growth of seedling; comparing with the control, the root-shoot ratio and root vigor of the treated seedlings averagely increased by 128.2% and 130.7%, respectively. The height of seedling was obviously negatively correlated to foliar Uniconazole spraying concentration. While for the stem girth, fresh weight, dry weight, chlorophyll content, vigor of root system and activity of nitrate reductase, Uniconazole application showed an effect of facilitation at low concentration and an effect of inhibition at high concentration. By spraying Uniconazole at the preparable concentration of 20mg/L, the root to shoot ratio reached 0.105 and the chlorophyll content, vigor of root system and nitrate reductase activity increased by 12.28%, 38.39% and 154.33%, respectively. The development of tobacco seedlings is promoted by spraying 20 mg/L Uniconazole at the fifth true leaf stage.

关 键 词：烯效唑 漂浮育苗 施用方式 生理指标 

分 类 号：S572.01[农业科学—烟草工业]