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Hybridization and introgression between Callicarpa japonica and C. mollis (Verbenaceae) in central Japan, as inferred from nuclear and chloroplast DNA sequences
Author(s) -
Tsukaya Hirokazu,
Fukuda Tatsuya,
Yokoyama Jun
Publication year - 2003
Publication title -
molecular ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.619
H-Index - 225
eISSN - 1365-294X
pISSN - 0962-1083
DOI - 10.1046/j.1365-294x.2003.01961.x
Subject(s) - introgression , biology , japonica , hybrid , chloroplast dna , botany , genome , gene , genetics
Callicarpa × shirasawana is a natural hybrid between C . japonica and C . mollis , and has a morphology that is intermediate between those of the parent species. Characterization of natural Callicarpa populations in the Atsumi Peninsula of central Japan, which all three of the above species inhabit sympatrically, revealed hybrids with various morphologies. Molecular analysis revealed a high occurrence of introgression of the C . japonica genome into that of C . mollis . Moreover, all individuals examined with morphology similar to that of C . mollis had genetic traces of hybridization with C . japonica . Molecular analysis of individual C . mollis and C . japonica from five other areas of Japan showed that introgression of C . japonica into C . mollis occurs widely. Molecular data also strongly suggested that the previously recognized C . × shirasawana individuals with intermediate morphology are not F 1 hybrids between C . japonica and C . mollis , but instead are progeny of C . × shirasawana backcrossed with C . japonica . Moreover, it was revealed that individuals with F 1 ‐type genotypes are indistinguishable morphologically from pure C . mollis . The results of the present study point to the need for re‐evaluation of natural populations of C . mollis and C . × shirasawana .