摘要
在水分胁迫条件下 ,以紫丁香和小叶锦鸡儿 2年生苗木为材料 ,叶面喷施不同浓度Vc。研究发现 ,Vc能有效降低水分胁迫条件下各树种叶片MDA含量和细胞质膜相对透性 ,可延缓叶水势、叶相对含水量、可溶性蛋白质含量和叶绿素含量的下降。同时对各处理进行了抗旱性鉴定 ,筛选出有效增强苗木抗旱性的喷施浓度。其中喷施 8.5～ 11.5mmol/L的Vc能同时显著提高小叶锦鸡儿的抗旱能力和水分利用效率 ;喷施 5 .5mmol/L的Vc能显著提高紫丁香的抗旱能力 ;喷施 8.5～ 11.5mmol/L的Vc虽然不能显著提高紫丁香的抗旱能力 ,却能显著提高水分利用效率。
The effects of different concentrations of Vc on drought resistance of two-year-old seedlings of Syringa oblata and Caragana microphylla under water stress were studied. The results show that Vc, as the free radical scavenger, can decrease the level of MDA content and permeability of cell plasma membrane, and retard the decrease of leaf water potential, relative water content, chlorophyll and resoluble protein content in shrub plants under drought stress. On this basis, different treatments for comprehensive judgment of drought resistance ability of the shrubs were conducted. Drought resistance and water use efficiency of Caragana microphylla treated with Vc of 8.5～11.5 mmolL and drought resistance of Syringa oblata with Vc of 5.5 mmolL can be obviously increased. The treatment with Vc of 8.5～11.5 mmolL can obviously increase water use efficiency of Syringa oblata, although its drought resistance cannot be increased significantly.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2004年第3期16-18,共3页
Journal of Northeast Forestry University
关键词
VC
灌木
抗旱性
Vc
Shrub
Drought resistance
