Taxonomy, chromosome numbers, clonal diversity and population dynamics of Phragmites australis

摘要: Phragmites australis (Cav.) Trin. ex Steud. (common reed) is one of the most widespread plant species in world. The has a high phenotypic variation morphology and life- history traits. This can be related to variance chromosome numbers, clonal diversity, plasticity clones or combination these. An overview our present, still limited, knowledge concerning amounts, causes maintenance genetic diversity P. given. In large range euploid number been found (between 3x-12x, except for 5x 9x, with x=12). Europe tetraploids are dominant, whereas octoploids predominate Asia. Aneuploids also occur regularly australis, differences numbers have observed even within clones. Clonal studied using allozyme polymorphisms molecular markers. Both mono- polyclonal stands known exist. A surprisingly European stands. Environmental factors, which may account this discussed. studies on occurrence ecotypes no distinction made between plastic variation. But evidence exists that responses climate, hydrology salt basis. Until now attempts determine genes gene complexes responsible these different responses. [KEYWORDS: ploidy levels; ecotypes; somatic mutations; environmental gradients; life-history; die-back Trin steudel; diversity; genotypic markers; plant-populations; seed dispersal; gramineae; dieback; growth; stands]