中文摘要：

以盆栽的短葶山麦冬为材料,采用称重控制浇水的方法,设置对照（CK）、轻度胁迫（W1）、中度胁迫（W2）、重度胁迫（W3）4个处理[土壤含水量分别为土壤田间持水量（FC）的80%、65%、50%和35%],研究不同程度土壤水分胁迫对短葶山麦冬生长和总皂苷量的影响规律.结果表明：短葶山麦冬生物量总体分配格局表现为叶片〉根茎〉须根〉叶基〉块根.在胁迫至d 75（块根发生期）和d 130（块根膨大前期）时中度胁迫（50%FC）组具有最大的叶片和须根生物量及须根分配比例,d 195（块根膨大后期）时对照（80%FC）具有最大的叶片和须根生物量,但各处理差异未达显著水平.随土壤水分胁迫的加剧,叶生物量分配比例总体呈下降趋势.中度胁迫组具有最大的块根生物量和块根分配比例及根冠比,而重度胁迫推迟了块根的萌生.各土壤水分条件下须根总皂苷含量差异不显著,对照的须根总皂苷产量显著高于轻度和重度胁迫组.表明短葶山麦冬对土壤水分有较强的适应性,随土壤水分减少,趋于将更多的资源分配给根系以提高根冠比,50%FC土壤水分条件可提高块根产量,80%FC下可获最大的须根总皂苷产量.图3表1参19

英文摘要：

Four different levels of water stress,mild water stress（W1,65% FC）,moderate water stress（W2,50% FC）,severe water stress（W3,35% FC） and the control（CK,80% FC）,were applied to study the effects of water stress on the growth and total saponin content of fibrous root of Liriope muscari（Decne.） Bailey by pot culture.The results showed that the biomass distribution of organs in order was leaf rhizome fibrous root leaf base tuber root.The moderate stress treatment had the biggest leaf and fibrous root biomass,and fibrous root biomass proportion at d 75（tuber-bearing stage） and d 130（tuber-expanding stage）,while at d 195（tuber-expanding late stage） CK group had the biggest leaf and fibrous root biomass,but had no significant difference compared with the other treatments.The distribution proportion of leaf biomass showed a descend trend as a whole with the decreasing of soil water content.The biomass,proportion of tuber and ratio of root and shoot were biggest in the moderate water stress treatment.The severe water stress retarded the tuber initiation.The total saponin contents of fibrous root had no significant difference among the different water stress treatments.The total saponin yield of fibrous root of the control treatment was significantly higher than those of the mild and severe water treatments.The results indicated that L.muscari（Decne.） Bailey had the great adaptability to different soil water condition and tended to allocate more resources to roots to raise root/shoot ratio under water stress.The tuber yield could increase under 50% FC and the total saponin yield of fibrous root would be highest under 80% FC.Fig 3,Tab 1,Ref 19