广藿香根际土壤水浸液对其扦插苗的化感自毒作用  

Allelopathy Autotoxicity Effects of Aquatic Extracts from Rhizospheric Soil on Rooting and Growth of Stem Cuttings in Pogostemon cablin

作　　者：唐堃[1] 李明[1] 董闪 赵盼[1] 黎韵琪 黄结雯 李龙明[1] 

机构地区：[1]广东药学院中药学院,广东广州510006

出　　处：《中药材》2014年第6期935-939,共5页Journal of Chinese Medicinal Materials

基　　金：广东省科技计划项目(2011B031700067);广东药学院中药学重点学科专项基金

摘　　要：目的:探讨广藿香根际土壤水浸液对后茬广藿香扦插苗生根的影响,初步揭示广藿香根际土壤的化感作用。方法:分别考察不同浓度的广藿香根际土壤水浸液对其扦插苗在生根过程中的生理指标影响。结果:广藿香根际土壤水浸液对其扦插苗生根的生根率、根长、平均不定根数、根系活力以及扦插苗的生长速率和鲜重增加速率均具有不同程度的抑制作用;随水浸液浓度的升高,其对扦插苗生根率、根长、平均不定根数、生长速率和鲜重增加速率的抑制作用越明显,并降低了叶片的叶绿素含量;升高了叶片MDA的含量,扦插苗POD、PPO和IAAO酶的活性也受到了影响。结论:不同浓度广藿香根际土壤水浸液对其扦插苗不定根的形成和生长有不同程度的抑制效应。Objective：To study the allelopathy effects of aquatic extracts from rhizospheric soil on the rooting and growth of stem cuttings in Pogostemon cablin, and to reveal its mechanism initially. Methods ： The changes of rhizogenesis characteristics and physic-bio- chemical during cutting seedlings were observed when using different concentration of aquatic extracts from rhizospheric soil. Results ： A- quatic extracts from rhizospherie soil had significant inhibitory effects on rooting rate ,root number,root length ,root activity, growth rate of cuttings with increasing concentrations of tissue extracts ; The chlorophyll content of cutting seedlings were decreased, but content of MDA were increased,and activities of POD,PPO and IAAO in cutting seedlings were affected. Conclusion ： Aquatic extracts from rhizos- pheric soil of Pogostemon cablin have varying degrees of inhibitory effects on the normal rooting and growth of stern cuttings.

关 键 词：广藿香 土壤水浸液 连作障碍 化感自毒作用 扦插 

分 类 号：R282.2[医药卫生—中药学]