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Authors Alpha, CG; Drake, DR; Goldstein, G
Author Full Name Alpha, CG; Drake, DR; Goldstein, G
Title Morphological and physiological responses of Scaevola sericea (Goodeniaceae) seedlings to salt spray and substrate salinity
Source AMERICAN JOURNAL OF BOTANY
Language English
Document Type Article
Author Keywords coastal habitats; Goodeniaceae; Hawaiian archipelago; salinity; salt spray; Scaevola sericea
Keywords Plus PLANT ZONATION; MARSH; PHOTOSYNTHESIS
Abstract The effects of substrate salinity and salt spray upon seedlings of Scaevola sericea were examined in this study. Three levels of substrate salinity: 0.0 ppt, 3.0 ppt, and 10.0 ppt were examined in conjunction with three levels of salt spray: zero, medium (approximate to 200 mg . m(-2). d(-1)), and high (approximate to 1200-1500 mg . m(-2). d(-1)). Leaf surface area, root to shoot ratio, as well as leaf, stem, and root mass decreased significantly (P less than or equal to 0.05) with increasing substrate salinity. Biomass accumulation was very low at 10.0 ppt substrate salinity, suggesting that higher levels of substrate salinity cannot be tolerated by the seedlings. Salt spray had a substantial effect on several of these variables, however its effects were less pronounced than those of substrate salinity. Cell sap osmolarity, leaf thickness, and leaf specific mass increased significantly (P less than or equal to 0.05) with both increasing substrate salinity and salt spray levels. Leaf carbon isotope ratios (delta(13)C) became more positive with increasing salinity, indicating an enhancement of the intrinsic water use efficiency of the seedlings at higher salinities. Scaevola sericea is one of the dominant plants found at the leading edge of strand communities in the Hawaiian archipelago and throughout much of the tropical Pacific. Since substrate salinity and salt spray increase with proximity to the ocean, the two factors may act together to limit the seaward expansion of S. sericea in coastal habitats.
Author Address GEORGIA SO UNIV,DEPT BIOL,STATESBORO,GA 30460; UNIV HAWAII,DEPT BOT,HONOLULU,HI 96822
Times Cited 25
Total Times Cited Count (WoS, BCI, and CSCD) 26
Publisher BOTANICAL SOC AMER INC
Publisher City COLUMBUS
Publisher Address OHIO STATE UNIV-DEPT BOTANY 1735 NEIL AVE, COLUMBUS, OH 43210
ISSN 0002-9122
29-Character Source Abbreviation AM J BOT
ISO Source Abbreviation Am. J. Bot.
Publication Date JAN
Year Published 1996
Volume 83
Issue 1
Beginning Page 86
Ending Page 92
Digital Object Identifier (DOI) 10.2307/2445958
Page Count 7
Web of Science Category Plant Sciences
Subject Category Plant Sciences
Document Delivery Number TQ266
Unique Article Identifier WOS:A1996TQ26600012
Plants associated with this reference

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