AOBPreview published online on January 30, 2006
Annals of Botany, doi:10.1093/aob/mcl009
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1 The Nagoya University Museum, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan
* To whom correspondence should be addressed.
• Background and Aims Domatia are small organs usually found in the axils of major veins on the underside of leaves and, although they have received wide attention from ecologists, few detailed reports exist on their anatomy or development. This study is focused on the domatia of Cinnamomum camphora (Lauraceae) and is the first comparative study on the anatomy and development of the different shapes of domatia within a single plant. • Methods Four types of domatia in C. camphora leaves were observed on paraffin sections under a microscope. • Key Results The domatia consisted of six histological parts: the upper epidermis, the upper mesophyll tissue, spongy tissue, the lower mesophyll tissue, the tissue filling the rim opening, and the lower epidermis. They differed from the non-domatial lamina mainly in the cell structure of the upper and lower mesophyll tissue and the rim tissue. Differences in domatium shapes were mainly associated with differences in the structure of the upper mesophyll and in the number and size of the rim tissue cells. Differences in the development of domatium types were observed in terms of initiation timing, differentiation of the upper mesophyll cells and degree of rim tissue development. • Conclusions In domatia, active anticlinal division in the lower mesophyll cells, as compared with the upper mesophyll cells, was coordinated with dynamic growth of rim tissue cells and resulted in cavity formation. The anatomical or developmental differences among the four types of domatia were related to the positions of the domatia within a leaf. In terms of the ecological implications, the major anatomical difference between the domatia used by herbivorous and carnivorous mites was in the development of the rim tissue.
Received August 2, 2005
Revised October 13, 2005
Accepted December 6, 2005
Article
A Comparative Study on the Anatomy and Development of Different Shapes of Domatia in Cinnamomum camphora (Lauraceae)
SACHIKO NISHIDA 1 *,
HIROKAZU TSUKAYA 2,
HIDETOSHI NAGAMASU 3,
and
MASUMI NOZAKI 1
2 National Institute for Basic Biology, Okazaki Institute for Integrated Bioscience, Myodaiji-cho, Okazaki, 444-8585, Japan; Present address: Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Tokyo, 113-0033 Japan
3 The Kyoto University Museum, Kyoto, 606-8501, Japan
SACHIKO NISHIDA, E-mail: nishida{at}num.nagoya-u.ac.jp
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