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Publication Type J
Authors Al-Arbash, A; Al-Bader, D; Suleman, P
Author Full Name Al-Arbash, Aala; Al-Bader, Dhia; Suleman, Patrice
Title Structural and biochemical responses of the seagrass Halodule uninervis to changes in salinity in Kuwait Bay, Doha area
Source KUWAIT JOURNAL OF SCIENCE
Language English
Document Type Article
Author Keywords Halodule uninervis; osmoregulation; proline; salinity; seagrass
Keywords Plus ZOSTERA-CAPENSIS SETCHELL; PROLINE ACCUMULATION; POSIDONIA-OCEANICA; HYPERSALINE STRESS; CYMODOCEA-NODOSA; WATER RELATIONS; LEAF-CELLS; TOLERANCE; OSMOREGULATION; PLANTS
Abstract The effects of salinity in Doha bay, Kuwait, on the osmotic potential, amino acids, and proline accumulation as osmoprotectants in Halodule uninervis tissues from seagrass meadows were investigated. The relationships between osmotic potential, amino acids, proline levels in leaves and rhizome/root tissues of H. uninervis and a range of osmolality of seawater was determined in the laboratory. The mean salinity of the seawater in the intertidal zone of the bay was 38.03%, and relative water content of mature leaves was less than 45%. There was a high correlation between salinity and the osmotic potential of cell sap of H. uninervis tissues. Total amino acids accumulated in backshore samples were higher than those in foreshore samples. Proline was the most abundant amino acid (41-51%), followed by glutamine and alanine in both leaves and rhizome/root tissues in mid-summer. Anatomical study showed ultrastructural adaptations including thicker tangential cell walls in leaf epidermal cells, highly invaginated plasmalemma, numerous chloroplasts, plastoglobuli and mitochondria in epidermal cells associated with increased salinity. Physiologically, salinity tolerance by H. uninervis was related to the accumulation of compatible solutes. The minimum threshold of salinity that caused tissue damage in H. uninervis was -6.36 MPa and -8.06 in rhizomes and leaves, respectively.
Author Address [Al-Arbash, Aala; Al-Bader, Dhia; Suleman, Patrice] Kuwait Univ, Fac Sci, Dept Biol Sci, POB 5969, Safat 13060, Kuwait
Reprint Address Al-Bader, D (reprint author), Kuwait Univ, Fac Sci, Dept Biol Sci, POB 5969, Safat 13060, Kuwait.
E-mail Address dhiaalbader@yahoo.com
Funding Agency and Grant Number College of Graduate Studies through Research Administration at Kuwait University; RSPU project [GS01/01, GS01/10]
Funding Text This research was funded by the College of Graduate Studies through Research Administration at Kuwait University. We would like to thank RSPU project numbers GS01/01 and GS01/10. The Electron Microscope Unit, namely, Mrs. Ahlam and Mr. Same, for their excellent technical support. We are also grateful to staff members of RSPU especially Mrs. Jeesu K. Samuel and Mr. Jophy Ouseph for their tremendous help.
Cited Reference Count 55
Publisher ACADEMIC PUBLICATION COUNCIL
Publisher City KHALDIYA
Publisher Address PO BOX 17225, KHALDIYA 72453, KUWAIT
ISSN 2307-4108
29-Character Source Abbreviation KUWAIT J SCI
ISO Source Abbreviation Kuwait J. Sci.
Publication Date OCT
Year Published 2016
Volume 43
Issue 4
Beginning Page 131
Ending Page 142
Page Count 12
Web of Science Category Multidisciplinary Sciences
Subject Category Science & Technology - Other Topics
Document Delivery Number EF8IS
Unique Article Identifier WOS:000390573100014
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