干旱胁迫对艾纳香盆栽幼苗生长及叶片结构的影响

Response on the Biomass and Leaf Structure of Blumea balsamifera L. DC. Seedling to Water Stress

【目的】了解特色药用植物艾纳香(Blumea balsamifera L. DC.)幼苗期在不同水分胁迫下不同取样时期的苗高、地径、生物量及叶结构变化,寻找最佳栽培条件。【方法】2014年5—9月,以一年生艾纳香幼苗为试验材料,进行不同程度(土壤田间持水量:CK为80%,轻度胁迫LD为60%,中度胁迫MD为40%,重度胁迫SD为30%)的干旱胁迫盆栽试验,测定艾纳香生物量和显微镜下的叶结构指标,分析不同程度干旱对艾纳香生物量和叶片结构的影响。【结果】不同干旱程度下,艾纳香的生物量、叶片厚度、栅栏组织与细胞结构紧密度(CTR)均随土壤水分的减少而减少,而根冠比、细胞结构疏松度(SR)与海绵组织随水分的减少而增大。【结论】中度胁迫是艾纳香生长可承受的最大范围,人工种植在土壤含水量40%下能维持叶片与地径的生长,从而获得药用材料。

[Purpose]To understand the changes of plant height,diameter,biomass and leaf structure of different medicinal plant Blumea balsamifera L.DC.under different water stress in order to find out the best cultivation conditions.[Method]The experiments were conducted on 1-year-old B.balsamifera seedlings as test materials for 4 months(May-September 2014)with different degrees of drought stress(CK was 80%of field soil water content,LD was 60%and MD was 40%,SD 30%).The biomass and the leaf structure index under the microscope were determined.The effects of different degrees of drought on the biomass of B.balsamifera and the structure of the leaves were analyzed.[Result]Under different drought degrees,biomass,leaf thickness,palisade tissue and cell tense ratio(CTR)decreased with decreasing soil moisture,whereas root-shoot ratio,spongy ratio(SR)and sponge tissue increased with decreasing water content.[Conclusion]Moderate stress is the maximum tolerable range of the plant growth.Artificial planting can maintain the growth of leaves and ground diameter under 40%of the soil water content to obtain the medicinal material.