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Abstract
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| Reversible stem swelling and shrinking monitored through linear variable displacement transducer (LVDT) can be attributed to water gain or loss from elastic plant tissues. Flow-induced oscillations of elastic tubes have been documented in many engineering and biomechanical systems. We aimed at investigating whether such oscillatory flow could be detected in stem tissues in order to gain some insight into the contribution of stored water to the ascent of sap. Four to six LVDT sensors were placed at different heights in the stem of four Eucalyptus globulus seedlings. Both increasing soil water or decreasing transpiration led to a steep increase in stem diameter (up to 102 ?m in 15 minutes). Maximum daily stem shrinkage (mds) was highest in the most apical stem sections. Maximum stem hydraulic conductivity was lowest in those plants in which the highest mds values were measured, as could be expected from the Ohms law analogy whenever mds values were correlated to xylem water potential. Data measured every 30 seconds and 2-min means revealed oscillatory patterns of stem swelling and shrinking, with series of up to 24 consecutive waves of quite similar wavelength that could be detected at different heights in the stem and both when the sensor was placed over bark or directly over the xylem. Oscillatory patterns previously reported in transpiration, stomatal conductance and sap flow had much longer wavelengths (70 min) than those found in the present study (<10 min). The relevance of shortwavelength oscillations in xylem sap transport is discussed. | |
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International
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Si |
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Congress
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Plant Biology Europe. FESPB/EPSO |
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960 |
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Place
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Reviewers
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Si |
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ISBN/ISSN
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00-0000-000-0 |
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Start Date
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22/06/2014 |
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End Date
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26/06/2014 |
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From page
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460 |
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To page
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460 |
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Abstract Book Poster Presentations |