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Coastal Adaptation of Adenophora triphylla var. japonica (Campanulaceae)

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Author(s): Kyohei Ohga | Miwako Muroi | Hiroshi Hayakawa | Jun Yokoyama | Katsura Ito | Shin-Ichi Tebayashi | Ryo Arakawa | Tatsuya Fukuda

Journal: American Journal of Plant Sciences
ISSN 2158-2742

Volume: 04;
Issue: 03;
Start page: 596;
Date: 2013;
Original page

Keywords: Adaptation | Adenophora triphylla var. japonica | Coastal | Ecotype | Heterochronic | Leaf Thickness

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.

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