Genetic Diversity And Turf Quality On Cynodon Dactylon In The Southwest Of China

Cynodon dactylon var. dactylon (common bermudagrass) is the most important member of the Gramineous genus Cynodon, as a world-famous warm-season turfgrass propagated widely. There is abundant native bermudagrass germplasm in the South of China, with great potential of utilization.After a whole investigation in ecological distribution areas and growth habits of bermudagrass populations in the south of China, 50 typical bermudagrass accessions among more than 300 of the collections from the South-west of China were selected as experimental materials. In view of their abundant variation and genitic diversity, systematic studies on different levels had been made on morphology, micromorphology characters of leaf and DNA markers (including RAPD, ISSR and RAMP markers). And turf characters of native bermudagrass accessions were valuated through Turf Quality Comprehensive Assessment System. Based on that, genitic relationships of bermudagrass accessions could be learned about. It was very helpful to construct core germplasm pool, and strenthen to reserve or utilize bermudagrass germplasm. So, merit bermudagrass accessions could be selected for breeding. The main research fruits went as follows:(1) The native bermudagrass populations were distributed at the altitude of 146 m to 3080 m, and they could grow in lots of types of soil, such as yellow-brown soil, brown soil, yellow soil, black soil, and so on. The bermudagrass distributed dottedly, and was often not dominant species in the community. The ecological environment types could be classified into three types, which were plateau and mountain grassland type, hill grassland type, and flood bed grassland type. There was obvious variation in 15 external morphology characters of bermudagrass; among...