Foliar uptake of water by wet leaves of Sloanea woollsii, an Australian subtropical rainforest tree

Yates D.J. and Hutley L.B. (1995) Foliar uptake of water by wet leaves of Sloanea woollsii, an Australian subtropical rainforest tree. Australian Journal of Botany, 43 2: 157-167. doi:10.1071/BT9950157


Author Yates D.J.
Hutley L.B.
Title Foliar uptake of water by wet leaves of Sloanea woollsii, an Australian subtropical rainforest tree
Journal name Australian Journal of Botany   Check publisher's open access policy
ISSN 1444-9862
Publication date 1995-01-01
Sub-type Article (original research)
DOI 10.1071/BT9950157
Open Access Status
Volume 43
Issue 2
Start page 157
End page 167
Total pages 11
Subject 1110 Nursing
1105 Dentistry
Abstract At leaf water potentials (ψ) of around -2.5 MPa, detached leaves of Sloanea woollsii F.Muell., an Australian subtropical rainforest tree, were able to absorb small amounts of water vapour from a saturated atmosphere, but absorbed considerably more liquid water if their surfaces remained wet. When leaves attached to small branches exhibiting a ψ of -2 MPa were sprayed with water and maintained in a saturated atmosphere, leaf ψ returned to saturation values within about 6 h. In a further experiment, a ψ of -2 MPa was imposed on detached, forked branches. Branches were then exposed to a saturated atmosphere and leaves on one half of the fork were kept wet whilst the rest remained dry. Leaf ψ was measured periodically for both dry and wet leaves and in both cases was found to increase with time. This indicated that leaf surface water was imbibed by wet leaves and transported into the branch resulting in alleviation of low water potentials in the dry leaves. In the submontane rainforests in which S. woollsii occurs, extended periods with little or no rainfall occur regularly. Throughout the year, foliage is wet by fog or dew alone for about 25% of the time. It is suggested that the presence of leaf surface water during rainless periods when leaf Psi is low may be important for the survival of S. woollsii. The actual mechanism of foliar absorption is uncertain, but is likely to be direct imbibition through the cuticle.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
 
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