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Thermonasty of young main stems of Phryma leptostachya (Phrymaceae)

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Abstract

Thermonasty-like responses were observed on some main stems of Phryma leptostachya (Phrymaceae) plants cultivated in the open. To confirm the thermonastic nature of these responses, the plants were moved into an artificially illuminated chamber and observed under controlled conditions. At low temperatures (about 12°C) and in the dark, slanted terrestrial young main stems of P. leptostachya became prostrate. At higher temperatures (about 25°C) and in the dark, the prostrate stems became slanted. Their movement was confirmed under controlled conditions and is therefore considered to be thermonastic in nature.

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Acknowledgments

The authors thank Hiroshi Yura (Natural History Museum and Institute, Chiba, Japan) for reading earlier versions of the manuscript and making helpful suggestions and Tomoyuki Nemoto (Ishinomaki Senshu University, Japan), David E. Boufford, Emily W. Wood and Wendy Duan (Harvard University Herbaria, USA) for providing support in the collection of material. We also thank the two anonymous reviewers for their many valuable comments. This work was supported by a Grant-in-Aid for Scientific Research (B) (15405013) to Y. Endo from Japan Society for the Promotion of Science.

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  1. The College of Science, Ibaraki University, Bunkyo 2-1-1, Mito, 310-8512, Japan

    Yasuhiko Endo & Tomonari Miyauchi

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  1. Yasuhiko Endo
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  2. Tomonari Miyauchi
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Correspondence to Yasuhiko Endo.

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Endo, Y., Miyauchi, T. Thermonasty of young main stems of Phryma leptostachya (Phrymaceae). J Plant Res 119, 449–457 (2006). https://doi.org/10.1007/s10265-006-0007-6

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  • DOI: https://doi.org/10.1007/s10265-006-0007-6

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