Desiccation stress in intertidal seaweeds: Effects on morphology, antioxidant responses and photosynthetic performance

Flores-Molina, MR; Thomas, D; Lovazzano, C; Núñez, A; Zapata, J; Kumar, M; Correa, JA; Contreras-Porcia, L

Desiccation stress in intertidal seaweeds: Effects on morphology, antioxidant responses and photosynthetic performance

Flores-Molina, MR Thomas, D Lovazzano, C Núñez, A Zapata, J Kumar, M

Correa, JA Contreras-Porcia, L

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Publication Type:: Journal Article
Citation:: Aquatic Botany, 2014, 113 pp. 90 - 99
Issue Date:: 2014-02-01

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Field	Value	Language
dc.contributor.author	Flores-Molina, MR	en_US
dc.contributor.author	Thomas, D	en_US
dc.contributor.author	Lovazzano, C	en_US
dc.contributor.author	Núñez, A	en_US
dc.contributor.author	Zapata, J	en_US
dc.contributor.author	Kumar, M https://orcid.org/0000-0002-5247-3059	en_US
dc.contributor.author	Correa, JA	en_US
dc.contributor.author	Contreras-Porcia, L	en_US
dc.date.issued	2014-02-01	en_US
dc.identifier.citation	Aquatic Botany, 2014, 113 pp. 90 - 99	en_US
dc.identifier.issn	0304-3770	en_US
dc.identifier.uri	http://hdl.handle.net/10453/34108
dc.description.abstract	Seaweeds are differentially distributed between the upper and lower limits of the intertidal zone of rocky coasts around the world. Daily changes in tide height cause water loss, triggering desiccation stress as a consequence. How this stress affected some of the morphological characteristics and physiological responses in representative intertidal seaweeds with contrasting vertical distributions was explored in the present work. The selected species were Mazzaella laminarioides (upper-middle distribution), Scytosiphon lomentaria and Ulva compressa (middle distribution), and Lessonia spicata and Gelidium rex (lower distribution). To assess tolerance response to desiccation, cellular and morphological alterations, ROS production, enzymatic activity of catalase (CAT) and ascorbate peroxidase (AP) and photosynthesis performance were measured after a simulated emersion stress experiment. Results show different tolerance responses to desiccation, with seaweeds having higher intertidal distributions displaying greater antioxidant enzymatic activity, suggesting a higher capacity to buffer ROS excess induced during desiccation. Contrarily, this capacity seems to be absent or deficient in low intertidal species (i.e. L. spicata and G. rex), where AP and CAT activities were below detection limits, ROS were higher than normal and caused an over-oxidation of bio-molecules and photosynthetic disarray, explaining from a functional stand point their low distribution in the intertidal zone. © 2013 Elsevier B.V.	en_US
dc.relation.ispartof	Aquatic Botany	en_US
dc.relation.isbasedon	10.1016/j.aquabot.2013.11.004	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	Desiccation stress in intertidal seaweeds: Effects on morphology, antioxidant responses and photosynthetic performance	en_US
dc.type	Journal Article
utslib.citation.volume	113	en_US
utslib.for	0502 Environmental Science and Management	en_US
utslib.for	0602 Ecology	en_US
utslib.for	0607 Plant Biology	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
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	113	en_US

Abstract:

Seaweeds are differentially distributed between the upper and lower limits of the intertidal zone of rocky coasts around the world. Daily changes in tide height cause water loss, triggering desiccation stress as a consequence. How this stress affected some of the morphological characteristics and physiological responses in representative intertidal seaweeds with contrasting vertical distributions was explored in the present work. The selected species were Mazzaella laminarioides (upper-middle distribution), Scytosiphon lomentaria and Ulva compressa (middle distribution), and Lessonia spicata and Gelidium rex (lower distribution). To assess tolerance response to desiccation, cellular and morphological alterations, ROS production, enzymatic activity of catalase (CAT) and ascorbate peroxidase (AP) and photosynthesis performance were measured after a simulated emersion stress experiment. Results show different tolerance responses to desiccation, with seaweeds having higher intertidal distributions displaying greater antioxidant enzymatic activity, suggesting a higher capacity to buffer ROS excess induced during desiccation. Contrarily, this capacity seems to be absent or deficient in low intertidal species (i.e. L. spicata and G. rex), where AP and CAT activities were below detection limits, ROS were higher than normal and caused an over-oxidation of bio-molecules and photosynthetic disarray, explaining from a functional stand point their low distribution in the intertidal zone. © 2013 Elsevier B.V.

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http://hdl.handle.net/10453/34108