Intraspecific Variation of Nuclear Dna Content in Pinus Resinosa AIt.

Pinus resinosa displays a rather uniform phenotype over a relatively small geographic distribution with a 9-degree latitudinal spread. DNA quantity per cell from 20 seed sources collected throughout the growing range varied significantly by a factor of 2.2 from the lowest to the highest amount. A south-to-north increasing DNA gradient was not observed as reported previously for other members of the Pinaceae.