| Twelve native bermudagrass (Cynodon dactylon) accessions collected from Pan Xi region and three introduced accessions as controls including "Tifway" (C.dactylon XC. transvaalensis) and two native collections from Jiajiang of Sichuan and Xinlong of Hainan were studied to evaluate the genetic diversity on morphological and isoenzyme levels, and to asses the turf quality in field experiment. The results showed that: (1) the twelve morphological traits including internode length and diameter of stolon, length, width and hair of leaves, stand natural height, length and width of florets, length of racemes, spikelet number of inflorescences, floret number of spikelets, height of reproductive culms varied significantly. Abundant morphological diversity exists in the bermudagrass of Pan Xi region. Obviously, morphological variations of nutrient organs in which coefficient of average variations is 37.2% are higher than those in reproductive organs with 13% of average variation coefficient. (2)Based on the cluster analysis of twelve morphological traits, the fifteen accessions were grouped into three types: tall and strong type including COI, C02, C03, C04, COS, COS, C09, CIO; low and more hair type containing C06, C07, Cll, and C14; fine texture and short internode type with only introduced Tifway. (3)The patterns of isozyme POD and EST electrophoresis showed that genetic diversity is high, because of the protein polymorphisms of experimental accessions, and that these diversity is related to the geographic distribution and ecological factors. As the genetic marker, POD is suitable for31the study on the genetic diversity of bermudagrass. (4)Turf quality assesment data showed that C06 and C04 are suitable for the amenable turf, CIO has higher quality than Tifway in sport turf, and C01 , COS, CIO have highest score for playing ground turf while COS, C01, and COS can be used for water and soil conservation. |
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