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