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U.S. Department of Agriculture USDA Forest Service Southern Regional Extension Forestry Southern Regional Extension Forestry

Interspecific Incompatibility and Inviability Problems in Forest Trees

There are two principal types of genetically-controlled barriers to hybridity in immature forest tree seed. These are (1) incompatibility or blocking prior to fertilization, and (2) embryo inviability, resulting in abortion of the zygote at some stage after fertilization. An incompatibility system characterized by inability of the pollen tube to penetrate the stigma has been found in some poplar crosses. The block has been successfully overcome by use of a mixture of incompatible pollen and compatible, genetically-dead but physiologically-active pollen.


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Author(s): Howard B. Kriebel

Publication: Tree Improvement and Genetics - Northeastern Forest Tree Improvement Conference - 1973