In this study, identification and rDNA-ITS sequence analysis of an anthracnose pathogen on Dracaena fragrans were carried out. [Method] D. fra-grans leaves with lesions were used as experimental materials to isolate anthrac-nose pathogen. Morphological observation, rDNA-ITS amplification and sequence analysis were performed to identify the pathogen strain. [Result] Caonidia of the iso-lated anthracnose pathogen were straight or curved, el iptic to crescent, with 2-5 oil droplets, 7.5-20 × 4.5-5 μm. According to molecular phylogenetic analysis, the iso-lated pathogen strain was identified as a new species, which was named Col-letotrichum dracaena-fragrantis sp. nov. [Conclusion] This study provided theoretical basis for the prevention and control of anthracnose.
Medicago is an important grass in the legume family,which is suitable to be grown in neutral or alkalescent soils,and hence,can be widely spread in south of China with low pH value.It is one of major objectives to cultivate acid-aluminum tolerant species.In the research,6 high-quality species with high-yielding potential were taken as materials to make evaluation on acid-aluminum tolerance by cell-culture technique,and the results showed that tolerance capacity from high to low was GT13R＞Muge 701=Muge 702＞Acrora＞AC-3＞Sheshou No.2=Medicago sativa.
