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Publication Type J
Authors Bryant, C., T. I. Fuenzalida, A. Zavafer, H. T. Nguyen, N. Brothers, R. J. Harris, H. A. A. Beckett, H. I. Holmlund, O. Binks and M. C. Ball
Title Foliar water uptake via cork warts in mangroves of the Sonneratia genus
Source Plant Cell and Environment
Language English
Author Keywords dehydration kinetics pathway sclereids seasonality surface conductance avicennia-marina salinity tolerance growth-responses forest trees leaves plant sclereids penetration absorption lanceolata Plant Sciences
Abstract Foliar water uptake (FWU) occurs in plants of diverse ecosystems; however, the diversity of pathways and their associated FWU kinetics remain poorly resolved. We characterized a novel FWU pathway in two mangrove species of the Sonneratia genus, S. alba and S. caseolaris. Further, we assessed the influence of leaf wetting duration, wet-dry seasonality and leaf dehydration on leaf conductance to surface water (K-surf). The symplastic tracer dye, disodium fluorescein, revealed living cells subtending and encircling leaf epidermal structures known as cork warts as a pathway of FWU entry into the leaf. Rehydration kinetics experiments revealed a novel mode of FWU, with slow and steady rates of water uptake persistent over a duration of 12 hr. K-surf increased with longer durations of leaf wetting and was greater in leaves with more negative water potentials at the initiation of leaf wetting. K-surf declined by 68% between wet and dry seasons. Our results suggest that FWU via cork warts in Sonneratia sp. may be rate limited and under active regulation. We conclude that FWU pathways in halophytes may require ion exclusion to avoid uptake of salt when inundated, paralleling the capacity of halophyte roots for ion selectivity during water acquisition.
Author Address [Bryant, Callum; Fuenzalida, Tomas, I; Zavafer, Alonso; Nguyen, Hoa T.; Brothers, Nigel; Harris, Rosalie J.; Beckett, Holly A. A.; Holmlund, Helen, I; Binks, Oliver; Ball, Marilyn C.] Australian Natl Univ, Res Sch Biol, Plant Sci Div, Canberra, ACT 2601, Australia. [Nguyen, Hoa T.] Vietnam Natl Univ Agr, Hanoi, Vietnam. [Holmlund, Helen, I] Pepperdine Univ, Nat Sci Div, Malibu, CA 90263 USA. Bryant, C (corresponding author), Australian Natl Univ, Res Sch Biol, Plant Sci Div, Canberra, ACT 2601, Australia. callum.bryant@anu.edu.au
ISSN 0140-7791
ISBN 0140-7791
29-Character Source Abbreviation Plant Cell Environ.
Publication Date Sep
Year Published 2021
Volume 44
Issue 9
Beginning Page 2925-2937
Digital Object Identifier (DOI) 10.1111/pce.14129
Unique Article Identifier WOS:000754990900008

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