侧柏不同器官水提取物对油松种子萌发和幼苗生长的他感效应  

Allelopathic Effects of Aqueous Extracts of Platyciadus orientalis Different Organs on Seed Germination and Seedling Growth of Pinus tabulaeformis

作　　者：王冬梅[1] 李登武[1] 曹哲[1] 

机构地区：[1]西北农林科技大学林学院,杨凌712100

出　　处：《植物研究》2012年第6期675-679,共5页Bulletin of Botanical Research

基　　金：西北农林科技大学青年学术骨干支持计划(Z111020902);国家林业公益性行业科研专项(200904004)

摘　　要：研究了侧柏(Platycladus orientalis)根、枝、叶、果实不同浓度水提取物及枝叶挥发油对油松种子萌发和幼苗生长的他感效应。结果表明:侧柏各器官及挥发油都含有化感物质,均对油松种子萌发及幼苗生长表现出"高抑低促"效应,而且低浓度时的促进作用明显强于高浓度时的抑制作用。与对照相比,在浓度为2 mg.mL-1时,侧柏根水提取物对油松幼苗根长和鲜重的促进能力最强,其根长和鲜重分别比对照提高了79.78%和376.60%;侧柏叶水提取物对油松幼苗苗高促进能力最强,比对照提高了102.41%;侧柏枝水提取物对油松种子发芽的促进能力最强,发芽率比对照提高了65.63%。而在浓度为30 mg.mL-1时,除了侧柏根和枝水提取物对油松种子萌发(87.50%)和鲜重(85.11%)表现出明显的抑制作用外,其它提取物对油松幼苗根长和苗高生长的抑制作用均不明显。侧柏枝叶挥发油对油松种子萌发,幼苗生长均表现为促进作用,特别对油松种子萌发具有显著的促进作用,其促进率达70.37%。说明侧柏和油松混交,可能有利于油松树木生长及生产力的提高。Abstract Using petri dish bioassay, the allelopathic effects of roots, branches, leaves, seeds extracts and vola- tile oil of Platycladus orientalis were studied on the seed germination and seedling growth of Pinus tabulaeformis. The results showed that P. orientalis had alleloehemicals, and all extracts had allelopathic effects on the seed gremination and seedling growth. Furthermore, the promotion effect of extracts on seedling growth at low concen- tration （2 mg · mL^- 1 ） was stronger than the inhibition at high concentration （30 mg · mL^- 1 ）. The aqueous ex- tracts of roots promoted the seedling root and shoot fresh weight growth by 79.78% and 376.60%, respectively at 2 mg · mL^- 1 concentration; The aqueous extracts of leaves exhibited the strongest promotion effect on the growth of seedlings by 102.41%; The aqueous extracts of branches exhibited the strongest promotion effect on the seed germination by 65. centration （30 mg · mL^- 1 ） and the growth of effect on the seed proper proportion seedlings 63 %. On the contrary, all extracts had no obviously allelopathic effects at high con- except the roots and branches aqueous extracts on the seed germination （87.50%） fresh weight （ 85.11% ）. The volatile oil of P. orientalis had significant promotion germination by 70.37%. It indicated that mixed planting P. orientalis and P. tabulaeformis in and pattern could have promotion effect on the growth of P. tabulaeformis and forest production.

关 键 词：侧柏 油松 化感作用 种子萌发 幼苗生长 

分 类 号：S791.38[农业科学—林木遗传育种]