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The matK gene: sequence variation and application in plant systematics.

K Hilu, H Liang

American Journal of Botany

|June 29, 2011

Summary

The matK gene shows high substitution rates, making its 3' region ideal for resolving plant phylogenies above the family level. This gene offers valuable characters for diverse taxonomic studies.

Area of Science:

Molecular Biology
Plant Systematics
Phylogenetics

Background:

The matK gene is widely used for phylogenetic analysis within plant families.
Its utility for resolving relationships above the family level remains largely unexplored.

Purpose of the Study:

To investigate the evolutionary rates and patterns of nucleotide substitution in the matK gene.
To assess the effectiveness of matK in constructing plant phylogenies at higher taxonomic ranks.

Main Methods:

Analysis of complete and partial matK gene sequences from seed plants, liverworts, and monocot families.
Examination of nucleotide substitution rates, patterns, and conserved sectors.
Phylogenetic tree construction using varying amounts of sequence data from different gene regions.

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Main Results:

The matK gene exhibits high substitution rates and mutationally conserved sectors.
The 3' region of matK proved most effective for phylogenetic resolution.
Phylogenetic robustness plateaued after incorporating approximately 100 informative sites from the 3' region.
Both conserved (3' region) and variable (5' region) sites offer characters for different taxonomic levels.

Conclusions:

The matK gene, particularly its 3' region, is a valuable marker for plant systematics above the family level.
The gene provides a dual character set suitable for resolving relationships from tribal to division levels.
Consideration of partial sequencing impacts sample size in phylogenetic studies.