Study On Molecular Ecology Of Phragmites Australis

In this paper, the level and pattern of morphological variation and genetic variation in Phragmites australis have been analyzed. 14 populations of)? aztstrcdLc have been sampled from estuarine to inland lake along Yellow River. I population from typical freshwater Nanyanghu Lake was selected for comparison. The level and pattern of genetic variation were conducted by RAPDs and Allozymes. The mechanisms of ecological adaptation and ecotypes have been discussed by comparing the correlations among morphological variation, genetic variation, and ecological factors.The basal diameter, height of aerial stem, leaf length at middle stem, leaf width at middle stem, internode length at middle stem, intemodes number and panicle length of 30 plants from every population were recorded. The statistics of morphological characters showed that the distribution trends of the averages of morphological characters are similar among populations. However, the coefficients of variation (CV) within population of 7 morphological characters were very different. The CV of intemodes was largest and the CV of height was smallest within population. F-statistics showed that the differences of all morphological characters among populations were significant (P