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PROCEEDINGS: Index of Abstracts

GENETIC AFTEREFFECTS OF INCREASED TEMPERATURE IN LARIX

Ruth Hutchins Professor of Tree Physiology, Department of Forest Ecosystem Science; and Associate Professor of Biochemistry, Department of Biochemistry, Microbiology and Molecular Biology, respectively, University of Maine, Orono, ME 04469.

We tested the hypothesis that temperature during gametogenesis and embryogenesis can affect progeny genotype and phenotype. Identical crosses were made among cloned parents of Larix spp. inside and outside a greenhouse, where the temperature inside averaged 4oC above the outside temperature. Significant growth differences as a function of crossing environment were observed. When the crosses were grown in the same environment the phenotypes of crosses made inside tended to resemble more southern ecotypes. In addition, segregation distortion at the chlorophyll- a/b-protein locus as a function of crossing environment was observed. These results support the hypothesis that progeny phenotype and genotype can exhibit aftereffects that are a function of crossing environment.