7种百合科园林地被植物抗旱性研究

目的]为抗旱地被植物的选择提供更多的参考依据。方法]选取华南地区较为常见的7种百合科园林地被植物为试材,对其植物永久萎蔫率、叶片持水率,以及在土壤水分胁迫下(0 d、7 d、14 d、21 d、28 d)叶片相对含水量、相对电导率、丙二醛(MDA)含量、可溶性糖含量、游离脯氨酸含量7项生理生化指标的变化特点进行了研究,利用隶属函数法对它们的抗旱性进行综合评价。结果]参试的7种百合科地被植物永久萎蔫率均处15%以下的较低水平;随着土壤水分胁迫加剧,7种参试植物的叶片相对含水量有一定程度下降,叶片相对电导率和丙二醛含量均呈逐渐上升趋势;同为渗透调节物质的可溶性糖与脯氨酸含量变化不尽相同;其抗旱性均有较好表现,推测该科植物的抗旱性潜力较大。结论]矮麦冬抗旱性极强,天门冬、蜘蛛抱蛋、银边山菅兰次之;银边吊兰、"金娃娃"萱草抗旱性中等;山菅兰则相对较弱。

Study on the Drought Resistance of Seven Ground-cover Plants of Liliaceae

Objective] To provide references for the selection of drought-resistant ground-cover plants.Method] Seven common ground-cover plants of Liliaceae were selected from South China,their physiochemical indices,including the permanent wilting rate,leaf water-losing rate,relative water content,electric conductivity,malondialdehyde content,soluble sugar content,and free proline content,were determined under the condition of soil water stress for respectively 0 d,7 d,14 d,21 d and 28 d.Their drought resistance was comprehensively evaluated with the method of membership function.Result] The permanent wilting rate of all seven test plants was below the low level of 15%;with the increasing soil water stress,the relative leaf water content of all seven plants declined to certain extent,while the relative conductivity and MDA content all showed increasing trend;the changes of soluble sugar content and free proline content were not totally same in the seven plants,from which it can be projected that the plants had great potential for drought resistance.Conclusion] The strongest drought resistance was found in Ophiopogon japonicus var.nana,then followed by Asparagus cohcinchinensis(Lour.)Merr,Aspidistra elatior Blume and Dianella ensifolia(Linn.)DC’Silvery Stripe’,and the drought resistance of Chlorophytum comosum(Thunb.)Baker ’Variegatum’ and Hemerocallis×hybrida’Stella deoro’ was moderate,while that of Dianella ensifolia(Linn.)DC.was relatively weak.