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)
| Autor: | Emily Adams, Parker Laimbeer, Brant W. Touchette |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Chlorophyll a
geography Marsh geography.geographical_feature_category Ecology Photosystem II Aquatic Science Biology biology.organism_classification Age specific Environmental stress Performance index Salinity Horticulture chemistry.chemical_compound chemistry Juncus roemerianus Botany Ecology Evolution Behavior and Systematics |
| Zdroj: | Marine Biology. 159:2137-2147 |
| ISSN: | 1432-1793 0025-3162 |
| DOI: | 10.1007/s00227-012-2000-z |
| Popis: | 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 (Fv/Fm and Fv/Fo), electron transport flux per reaction center (ETo/RC), and photosystem II performance index (PIABS) 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. |
| Databáze: | OpenAIRE |
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