TY - JOUR
T1 - Morphological and genetic variation in populations in a hybrid zone between Leucosceptrum japonicum and L. stellipilum (Lamiaceae) in the central Japanese mainland
AU - Li, Yue
AU - Itoi, Tomomi
AU - Takahashi, Hiroshi
AU - Maki, Masayuki
N1 - Funding Information:
This study was partly supported by a Grant-in-Aid from the Japan Society for the Promotion of Science to MM. We are grateful to the following for their efforts in sampling, comments, and technical advice: S. Horie, T. Yamada, K. Yonekura, Y. Tsujita, Y. Sakamoto and K. Shimizu. We also thank the anonymous reviewers for helpful comments on the manuscript. The stay of YL in Japan is supported by the China Scholarship Council.
Publisher Copyright:
© 2014, Springer-Verlag Wien.
PY - 2015/3
Y1 - 2015/3
N2 - Hybrid zones between two species can reflect the combined effects of gene flow, genetic novelty, selection, and isolation barriers. Leucosceptrum japonicum and L. stellipilum are two morphologically distinct species belonging to Lamiaceae, which are endemic to Japan with partially overlapping distributions. In the present study, morphological and genetic variation in 11 populations in a putative hybrid zone between L. japonicum and L. stellipilum were investigated. No introgression was observed in the sympatric parental populations based on the cpDNA haplotype. Morphological intermediacy, ITS additivity and reduced pollen fertility confirmed the occurrence of hybridization between L. japonicum and L. stellipilum. Hybrid individuals appear to be not only early hybrid generation, but also advanced hybrid generation and/or backcross hybrids. The morphology of the putative early hybrid generation was too variable to distinguish all these hybrids from the parental species. The factors that facilitated and maintained hybridization between L. japonicum and L. stellipilum are discussed.
AB - Hybrid zones between two species can reflect the combined effects of gene flow, genetic novelty, selection, and isolation barriers. Leucosceptrum japonicum and L. stellipilum are two morphologically distinct species belonging to Lamiaceae, which are endemic to Japan with partially overlapping distributions. In the present study, morphological and genetic variation in 11 populations in a putative hybrid zone between L. japonicum and L. stellipilum were investigated. No introgression was observed in the sympatric parental populations based on the cpDNA haplotype. Morphological intermediacy, ITS additivity and reduced pollen fertility confirmed the occurrence of hybridization between L. japonicum and L. stellipilum. Hybrid individuals appear to be not only early hybrid generation, but also advanced hybrid generation and/or backcross hybrids. The morphology of the putative early hybrid generation was too variable to distinguish all these hybrids from the parental species. The factors that facilitated and maintained hybridization between L. japonicum and L. stellipilum are discussed.
KW - Hybrid zone
KW - Internal transcribed spacer
KW - Leucosceptrum
KW - Multivariate morphometrics
KW - Pollen fertility
KW - trnL-F
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U2 - 10.1007/s00606-014-1134-5
DO - 10.1007/s00606-014-1134-5
M3 - Article
AN - SCOPUS:84939894635
VL - 301
SP - 1029
EP - 1041
JO - Plant Systematics and Evolution
JF - Plant Systematics and Evolution
SN - 0378-2697
IS - 3
ER -