Seedling Response to Photoperiod and Temperature by Smooth Cordgrass, Spartina alterniflora, from Oregon Inlet, North Carolina

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Abstract
Seedlings ofSpartina alterniflora Loisel. from North Carolina were exposed to thermoperiods of 18–14, 22–18, 26–22, and 30–26 C under both short- and long-day photoperiods for a 14-week period. Seedling biomass increased under both photoperiods as temperatures of the thermoperiods increased, but was greater in each thermoperiod under long-day conditions. Seedlings grown under short-day conditions were shorter, contained less biomass, produced more culms and rhizomes, had less shoot moisture, and contained higher chlorophyll concentrations than those under long-day conditions at the same temperatures. Flowering occurred earlier under short-day conditions in the 26–22 and 30–26 C thermoperiods, but also occurred under long-day conditions in these thermoperiods and appeared to be related to height growth.

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