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期 刊 ：植物保护学报 2010年

关键词：假高粱；地下部分；生物测定；化感潜力；

Keywords:Sorghum halepense, subterranean part, bioassay, allelopathic potential,

摘 要 ：为进一步明确假高粱Sorghum halepense (L.) Pers. 成功入侵的化感潜力,利用生物测定方法研究了其地下部分对小麦种子萌发和生长的化感潜力。结果显示,播后第1天,假高粱根状茎、须根和根状茎+须根水浸提液浓度为0.04 g/mL时,对小麦种子萌发抑制率分别为76.00%、96.00%和70.00%;播后第5天,分别为6.77%、22.03%和10.17%。土壤介质中,小麦播种5天后,假高粱根状茎、须根及根状茎+须根粉碎物为0.040g/g时对小麦种子萌发的抑制率分别为32.20%、42.37%和35.59%。抑制活性随浓度增大而增强,随时间延长而降低。以3种材料干粉混入土壤,均对小麦幼苗苗高和根长有抑制作用。种子萌发及幼苗生长试验中,须根的抑制活性均强于根状茎。

Abstract:The allelopathic potential of Sorghum halepense (L.) Pers. was investigated by studying the effect of its subterranean parts (rhizome and fibrous root) on the germination and growth of Triticum aestivum. The subterranean parts were either extracted with water or mixed the pulverized tissues with soil. At 0.04g/mL, water-extracts from the rhizome, fiber and the whole subterranean tissue inhibited 76.00%, 96.00% and 70.00% germination of Triticum aestivum on the first day after sowing, while on the fifth day declined to 6.77%, 22.03% and 10.17% respectively. The results showed that the inhibition was strengthened with the increased concentration, weakened with increased treatment time. In soil, the rhizome, fiber and the whole subterranean tissue inhibited 32.20%, 42.37% and 35.59% germination on the sixth day after sowing. Each material that mixed into soil inhibited T.aestivumboth shoot and root growth. In this study, the inhibition effect of fiber was greater than that of rhizome.

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