3个榆科树种种子发芽对水分胁迫的响应和适应策略  

The Responses and Adaptive Strategies on Seeds Germination of Three Ulmaceae Tree Species to Water Stress

作　　者：韦小丽[1] 方升佐[2] 喻理飞[1] 朱守谦[1] 徐锡增[2] 

机构地区：[1]贵州大学林学院,贵阳550025 [2]南京林业大学森林资源与环境学院,江苏南京210037

出　　处：《种子》2009年第7期53-57,共5页Seed

基　　金：国家林业局重点课题"喀斯特地区造林技术选择和配置技术试验示范"(2003-055-L55);中科院西部之光项目"退化喀斯特森林恢复过程中树种更替机理研究"

摘　　要：采用聚乙二醇人工模拟水分胁迫进行种子发芽试验,研究了青檀、朴树和榔榆3个树种种子在干旱逆境下的种子发芽和成苗特性。结果表明,水分胁迫下3个树种的种子发芽率、成苗率、发芽速率和萌发幼苗胚根、胚轴伸长以及幼苗含水量均随环境水势的降低而下降,种子从发芽到成苗阶段对水分亏缺最敏感。3个树种种子发芽能忍耐的最低环境水势分别为-0.49、-0.32MPa和-0.15MPa,种子成苗能忍耐的最低环境水势分别为-0.32、-0.32MPa和-0.15MPa。水分胁迫解除后,具有生活力的种子能够恢复发芽,但水分胁迫对种子发芽的影响具有后续作用。3个树种种子发芽对水分胁迫的适应策略主要表现为耐旱发芽和避逆发芽。The seed germination and seedling establishment characters ofPteroceltis tatarinowii, Celtis sinensis and Ulmus parvifolia were studied by germination test under water stress condition（ simulated by polyethylene glycol （PEG））. The results indicated that the germination rate, seedling establishment rate, germination speed, length of embryonal root and embryonal axis as well as seedling water content of three tree species creased with decreasing environment potential. It was most sensitive period from seed germination to were deseedling establishment to water stress. The lowest environment potential for seed germination ofPteroceltis tatarinowii, Celtis sinensis and Ulmus parvifolia was - 0.49 MPa, - 0.32 MPa and - 0.15 MPa respectively, and the lowest environment potential of seedling establishment was -0.32 MPa, -0.32 MPa and -0.15 MPa re spectively. The vigor seeds could germinate again after derogating water stress, but the effects of water stress to seed germination existed hysterotely. The adaptive strategies for seed germination of three tree species to water stress mainly displayed drought tolerance germination and drought avoidance germination.

关 键 词：榆科树种 种子发芽 水分胁迫 响应 适应策略 

分 类 号：Q948[生物学—植物学] S792.19[农业科学—林木遗传育种]