Journal
MICROSCOPY RESEARCH AND TECHNIQUE
Volume 76, Issue 11, Pages 1204-1212Publisher
WILEY
DOI: 10.1002/jemt.22286
Keywords
pulvinule; pulvinus; secondary pulvinus; X-ray computed tomography; xylem vessel
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Funding
- Korea government (MSIP) (National Research Foundation of Korea [NRF]) [2008-0061991]
- National Research Foundation of Korea [2008-0061991] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Mimosa pudica has three distinct specialized organs, namely, pulvinus, secondary pulvinus, and pulvinule, which are respectively controlling the movements of petioles, leaflets, and pinna in response to external stimuli. Water flow is a key factor for such movements, but detailed studies on the organization of the vascular system for water transport in these organs have not been published yet. In this study, organizations of the xylem vessels and morphological features of the pulvinus, the secondary pulvinus, and the pulvinule were experimentally investigated by X-ray computed tomography and histological technique. Results showed that the xylem vessels were circularly distributed in the specialized motile organs and reorganized into distinct vascular bundles at the extremities. The number and the total cross-sectional area of the xylem vessels were increased inside the specialized motile organs. Morphological characteristics obtained in this study provided new insight to understand the functions of the vascular networks in the dynamic movements of M. pudica. Microsc. Res. Tech. 76:1204-1212, 2013. (c) 2013 Wiley Periodicals, Inc.
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