Coastal Adaptation of Adenophora triphylla var. japonica (Campanulaceae)

Kyohei Ohga, Miwako Muroi, Hiroshi Hayakawa, Jun Yokoyama, Katsura Ito, Shin-Ichi Tebayashi, Ryo Arakawa, Tatsuya Fukuda

Faculty of Agriculture, Kochi University, Kochi, Japan.
Faculty of Agriculture, Kochi University, Kochi, Japan..
Faculty of Science, Yamagata University, Yamagata, Japan..
Graduate School of Integrated Arts and Sciences, Kochi University, Kochi, Japan.
Graduate School of Integrated Arts and Sciences, Kochi University, Kochi, Japan..

DOI: 10.4236/ajps.2013.43078                

Abstract

The comparative morphology and anatomy of leaves between the coastal ecotype and the normal type of Adenophora triphylla (Thunb.) A.DC. var. japonica (Regel) H.Hara (Campanulaceae) were examined to clarify the differences in morphological characters between the 2 groups. Morphological and anatomical analyses revealed that the coastal ecotype had a thicker leaf than the normal type, because of the increased size of epidermal and spongy cells. Thus, the main morphological change from the normal type into the coastal ecotype of A. triphylla var. japonica is the increase in leaf size, suggesting that the coastal ecotype may have evolved from the normal type via a heterochronic process.

Keywords

Adaptation; Adenophora triphylla var. japonica; Coastal; Ecotype; Heterochronic; Leaf Thickness

Conflicts of Interest

The authors declare no conflicts of interest.

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