求米草的耐阴性研究  

Studies on shade-endurance capacity of Oplismenus undulatifolius

作　　者：贺彩艳[1] 李德荣[1] 

机构地区：[1]江西农业大学农学院,江西南昌330045

出　　处：《草业科学》2013年第10期1531-1534,共4页Pratacultural Science

基　　金：江西省学位与研究生教育教学改革研究项目

摘　　要：为明确求米草(Oplismenus undulatifolius)的耐阴性规律,对其在遮光率分别为0、60%、80%、85%和93%的5种不同阴蔽条件下的形态和生理指标进行了研究。结果表明,随着遮阴程度的加强,求米草各项形态指标(主茎长度、新叶数和分蘖数)均呈现出先升高后降低的变化过程;叶片相对含水量随遮光率的增加而逐步提高;在80%遮光率下,叶绿素含量最多,叶绿素a/b比值接近最小,游离脯氨酸含量迅速累积;且随着遮阴时间的延长,相同遮阴程度下的叶绿素含量、叶绿素a/b比值均有所下降,游离脯氨酸含量累积不明显。根据测定数据综合分析,求米草可作为耐阴地被植物,在遮阴程度为80%左右条件下,生长状态最佳,适于种植在郁闭度较高的林木下或建筑物旁等阴蔽处。A pot experiment was conducted to determine the effect of five shading conditions （shading rates of 0, 60 %, 80 % , 85 % and 93 %） respectively on morphological and physiological indexes of Oplismenus undulatifolius to study its shade-endurance capacity. The results showed that with the shading intensity increased, various morphological index （main stem length, new leaves number and tillers number） of O. undulatifolius were increased first and then decreased, while the relative water content of leaves gradually improved. Under the shading rate of 80%, the chlorophyll content reached its peak, the ratio of chlorophyll a/b was less than that under other environments, and the free proline content accumulated rapidly. In addition, with the shade the extension of time, chlorophyll content and ratio of chlorophyll a/b were decreased, meanwhile the accumulation process of free proline con tent became inapparent under the same shading treatment. According to the data, O. undulatifolius is suitable to cultivate under 80% shading condition in the higher canopy density under the trees or beside the buildings as a shadow tolerance groundcover plant.

关 键 词：求米草 耐阴性 形态指标 生理指标 

分 类 号：S688.4[农业科学—观赏园艺]