Contrasting patterns of DNA variation in natural populations of two related conifers, Cryptomeria japonica and Taxodium distichum (Cupressaceae sensu lato)

Tomoyuki Kado, Yutaka Ushio, Hiroshi Yoshimaru, Yoshihiko Tsumura, Hidenori Tachida

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We investigated DNA variation within and between two closely related conifers, Cryptomeria japonica and Taxodium distichum, at nuclear loci encoding ferredoxin, glutamyl-tRNA reductase, lycopene beta cyclase, and phosphoribosylanthranilate transferase. Average nucleotide diversity at silent sites was estimated to be 0.0035 (SE 0.0012) in C. japonica and 0.0058 (SE 0.0006) in T. distichum. One population in C. japonica was differentiated from the others but generally there was not much differentiation among populations or varieties within the two species. However, the two species seemed to differ in frequency spectra of DNA polymorphisms. Excesses of intermediate-frequency variants were found in C. japonica, whereas excesses of both rare and high-frequency variants were found in T. distichum, which suggested different histories of population structures in the two species. Deviations from the standard neutral expectations in DNA polymorphisms were found by applications of neutrality tests. The results show that actions of selection to respective loci seem to differ between the two species, indicating differences of interaction among evolutionary factors.

Original languageEnglish
Pages (from-to)103-113
Number of pages11
JournalGenes and Genetic Systems
Volume81
Issue number2
DOIs
Publication statusPublished - Jun 15 2006

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Genetics

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