紫穗槐叶片浸提液对长柄扁桃种子萌发和幼苗生长的影响

紫穗槐和长柄扁桃是中国西北干旱和半干旱地区的常见绿化植物.为探索紫穗槐搭配长柄扁桃进行绿化建设和生态修复的可行性,采用培养皿滤纸法和土培法测定了5种质量浓度的紫穗槐叶片浸提液(0.025、0.05、0.10、0.15和0.20 g ? mL-1)对长柄扁桃8个品种(YY1、YY3、YY4、YY5、YY6、SM6、SM7...

Effects of leaf extracts of Amorpha fruticosa on seed germination and seedling growth of Amygdalus pedunculata

Amorpha fruticosa and Amygdalus pedunculata are common plant species used for greening construction in arid and semi-arid region of Northwest China.In order to explore the feasibility of greening construction and ecological restoration by A.fruticose with A.pedunculata,we exami-ned the allelopathic effects of five concentrations of aqueous leaf extracts of A.fruticosa(0.025,0.05,0.10,0.15 and 0.20 g·mL^-1)on eight A.pedunculata varieties(YY1,YY3,YY4,YY5,YY6,SM6,SM7 and SM8),using the methods of paper-petri dish and soilless culture.The results showed that when the concentration of A.fruticosa leaf extracts were 0.025 and 0.05 g·mL^-1,the seed germination and seedling growth of YY1 and SM6 were significantly better than other varieties.With increasing concentration of A.fruticosa leaf extracts,the catalase activity of A.pedunculata seedlings first increased and then decreased.The activities of peroxidase and superoxide dismutase,and the contents of soluble protein and chlorophyll showed a downward trend,while the contents of malondialdehyde and soluble sugar and the permeability of cell membrane gradually increased.Results of the principal component and cluster analysis showed that the growth potential of A.pedunculata decreased with the order of YY1,SM6,SM8,SM7,YY6,YY3,YY5 and YY4under the allelopathic effect of A.fruticose.In conclusion,the artificial collocation and mixed planting of low-density of A.fruticosa with YY1 and SM6 were beneficial to seed germination and seedling growth of A.pedunculata.