Intraspecific morphological and genetic differentiation in Scrophularia grayana (Scrophulariaceae)

Takuro Kamada, Tadashi Yamashiro, Masayuki Maki

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Scrophularia grayana, which is distributed throughout northern Japan and Sakhalin, and its locally endemic variety var. grayanoides, have been examined morphometrically and genetically. Principal-component analysis using a total of 26 morphological characteristics revealed that these taxa are morphologically differentiated, but that the difference is not distinct. These two taxa have the same number of chromosomes in the somatic cells, 2n = 94, suggesting that ploidal level difference is not relevant to their divergence. The distributions of the taxa are adjoining in the north of Japanese mainland Honshu. Nevertheless, principal-coordinate analysis using putative 112 ISSR loci indicated they are genetically very distinct. Many taxon-specific alleles were found, and many of the alleles were fixed in each taxon. This genetic information suggests that a relatively long time has passed since the taxa became differentiated and that gene flow has rarely occurred between them, although morphological similarity has been maintained, probably because of natural selective forces.

Original languageEnglish
Pages (from-to)437-443
Number of pages7
JournalJournal of Plant Research
Issue number3
Publication statusPublished - 2007 May


  • Chromosome numbers
  • Genetic divergence
  • Inter-simple sequence repeat
  • Morphological characteristics
  • Principal-component analysis
  • Scrophularia

ASJC Scopus subject areas

  • Plant Science


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