Relative genome-size differences among populations of Spartina alterniflora Loisel (Poaceae) along East and Gulf Coasts of U.S.A.

Flow cytometric analysis of mithramycin-stained rhizome nuclei was used to compare relative amounts of DNA among 18 populations of Spartina alterniflora Loisel (Poaceae) from the East and Gulf Coasts of the U.S.A. The DNA amount increases, significantly with increasing latitude. These findings support the general model of genome size change with latitude.