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INTRASPECIFIC VARIATION OF NUCLEAR DNA CONTENT IN PINUS RESINOSA AIT.

Narinder K. Dhir, Jerome P. Miksche

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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.