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- Title
Age-specific responses to elevated salinity in the coastal marsh plant black needlerush ( Juncus roemerianus Scheele) as determined through polyphasic chlorophyll a fluorescence transients (OJIP).
- Authors
Touchette, Brant; Adams, Emily; Laimbeer, Parker
- Abstract
This study employed polyphasic chlorophyll a fluorescence transients (OJIP), a non-invasive marker of environmental stress in plants, to evaluate salt tolerance in three different Juncus roemerianus age classifications (6-, 24-, and 60-months). Following exposure to elevated salts (30 psu), the younger plants sustained growth, which was comparable to freshwater controls. While older (60-month) plants receiving only freshwater also grew over the 8-week study, the older salt-treated plants did not increase in size. Similarly, there were significant declines in variable chlorophyll a fluorescence parameters ( F/ F and F/ F), electron transport flux per reaction center (ET/RC), and photosystem II performance index (PI) for 60-month J. roemerianus following salt treatment. These responses were not evident in the two younger salt-treated age classifications. Our results suggest that older J. roemerianus are less tolerant to rapid and sudden increases in salinity relative to younger plants and that this age-specific response may help explain observed discrepancies in salt tolerance in J. roemerianus.
- Subjects
SALINITY &; the environment; SALT marsh plants; CHLOROPHYLL; EFFECT of salt on plants; AGE determination of plants; JUNCUS; HALOPHYTES
- Publication
Marine Biology, 2012, Vol 159, Issue 10, p2137
- ISSN
0025-3162
- Publication type
Article
- DOI
10.1007/s00227-012-2000-z