The response of the mangrove Avicennia marina to heterogeneous salinity measured using a split-root approach

Reef, R; Markham, HL; Santini, NS; Lovelock, CE

The response of the mangrove Avicennia marina to heterogeneous salinity measured using a split-root approach

Reef, R Markham, HL Santini, NS

Lovelock, CE

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Publication Type:: Journal Article
Citation:: Plant and Soil, 2015, 393 (1-2), pp. 297 - 305
Issue Date:: 2015-08-29

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Field	Value	Language
dc.contributor.author	Reef, R	en_US
dc.contributor.author	Markham, HL	en_US
dc.contributor.author	Santini, NS https://orcid.org/0000-0002-8319-8862	en_US
dc.contributor.author	Lovelock, CE	en_US
dc.date.issued	2015-08-29	en_US
dc.identifier.citation	Plant and Soil, 2015, 393 (1-2), pp. 297 - 305	en_US
dc.identifier.issn	0032-079X	en_US
dc.identifier.uri	http://hdl.handle.net/10453/118576
dc.description.abstract	© 2015, Springer International Publishing Switzerland. Aims: To investigate the physiological processes underlying freshwater utilisation in halophytes under non-uniform salinity conditions in order to determine whether preferential uptake of freshwater occurs and whether transient freshwater availability improves plant water relations and photosynthesis Methods: In a split-root experiment, we grew Avicennia marina (Forssk.) Vierh. at uniform salinity conditions (35:35 ppt) and then lowered (35:5 ppt) or increased (35:65 ppt) salinity to one compartment. Using δ<sup>18</sup>O-labelled water we calculated the extent of preferential water uptake of either source. Results: When given a 35:5 treatment, A. marina took-up three times more water from the fresher compartment than predicted by a root-weighted-no-salinity-preference model. No difference between compartments was observed in the 35:65 treatment, suggesting that avoidance of the more saline water did not occur. In the 35:5 treatment, stomatal conductance increased within 1.5 h, but photosynthetic rates were not enhanced over the 48-h period of the experiment and rapidly decreased in the 35:65 treatment. Conclusions: Avicennia marina responds to transient freshwater patches by increasing water uptake from areas of the root zone where the salinity is better for growth. However, photosynthetic rates respond to the highest salinity in the root zone; thus, reductions in salinity in part of the root zone may enhance water storage in stem tissues but positive effects on photosynthesis may require longer periods.	en_US
dc.relation.ispartof	Plant and Soil	en_US
dc.relation.isbasedon	10.1007/s11104-015-2489-2	en_US
dc.subject.classification	Agronomy & Agriculture	en_US
dc.title	The response of the mangrove Avicennia marina to heterogeneous salinity measured using a split-root approach	en_US
dc.type	Journal Article
utslib.citation.volume	1-2	en_US
utslib.citation.volume	393	en_US
utslib.for	050205 Environmental Management	en_US
utslib.for	0602 Ecology	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
utslib.for	07 Agricultural and Veterinary Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	closed_access
pubs.issue	1-2	en_US
pubs.publication-status	Published	en_US
pubs.volume	393	en_US

Abstract:

© 2015, Springer International Publishing Switzerland. Aims: To investigate the physiological processes underlying freshwater utilisation in halophytes under non-uniform salinity conditions in order to determine whether preferential uptake of freshwater occurs and whether transient freshwater availability improves plant water relations and photosynthesis Methods: In a split-root experiment, we grew Avicennia marina (Forssk.) Vierh. at uniform salinity conditions (35:35 ppt) and then lowered (35:5 ppt) or increased (35:65 ppt) salinity to one compartment. Using δ¹⁸O-labelled water we calculated the extent of preferential water uptake of either source. Results: When given a 35:5 treatment, A. marina took-up three times more water from the fresher compartment than predicted by a root-weighted-no-salinity-preference model. No difference between compartments was observed in the 35:65 treatment, suggesting that avoidance of the more saline water did not occur. In the 35:5 treatment, stomatal conductance increased within 1.5 h, but photosynthetic rates were not enhanced over the 48-h period of the experiment and rapidly decreased in the 35:65 treatment. Conclusions: Avicennia marina responds to transient freshwater patches by increasing water uptake from areas of the root zone where the salinity is better for growth. However, photosynthetic rates respond to the highest salinity in the root zone; thus, reductions in salinity in part of the root zone may enhance water storage in stem tissues but positive effects on photosynthesis may require longer periods.

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http://hdl.handle.net/10453/118576