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RESTRICTION FRAGMENT ANALYSIS OF PINE PHYLOGENY
Steven H Strauss1, Allan H Doerksen1
1Department of Forest Science, Peavy Hall 154, Oregon State University, Corvallis, OR, 97331-5705.
Summary
Phylogenetic analysis of pine (Pinus) species using DNA restriction fragment data reveals distinct hard and soft pine groups. Soft pines in section Parrya are closest to the genus root, suggesting recent radiation for most pine species.
Area of Science:
- * Molecular evolution and phylogenetics
- * Plant genomics and systematics
- * Conifer evolutionary biology
Background:
- * Understanding the evolutionary history of the genus Pinus (pine) is crucial for its conservation and taxonomic classification.
- * Previous classifications have been challenged by new molecular data, necessitating robust phylogenetic studies.
- * Restriction fragment analysis provides a method to assess genetic variation across different DNA types (chloroplast, nuclear, mitochondrial).
Purpose of the Study:
- * To investigate the phylogenetic relationships among pine species using restriction fragment analysis of multiple DNA genomes.
- * To clarify the evolutionary history and taxonomic placement of various pine subsections and species.
- * To infer patterns of diversification within the genus Pinus.
Main Methods:
- * Restriction fragment analysis of chloroplast, nuclear, and mitochondrial DNA from 18-19 pine species.
- * DNA digestion with 8 restriction enzymes, followed by blotting and probing with cloned DNA fragments.
- * Wagner and Dollo parsimony analyses of 116 shared characters, with bootstrapping and consensus tree construction.
Main Results:
- * Distinct clades identified for hard (subgenus Pinus) and soft pines (subgenus Strobus).
- * Soft pines in section Parrya (e.g., P. longaeva) are basal, while section Strobus species (e.g., P. koraiensis) are highly similar.
- * Hard pines showed weak differentiation, except for a P. canariensis and P. pinea clade; P. leiophylla grouped with section Pinus.
Conclusions:
- * The findings support a recent radiation event for the majority of pine species.
- * The study refines the understanding of relationships within pine subsections, particularly regarding P. leiophylla.
- * Further molecular studies, including DNA sequencing, are recommended for deeper insights into pine phylogeny and divergence times.
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