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Publication Type J
Authors Maricle, B. R. and R. W. Lee
Title Effects of environmental salinity on carbon isotope discrimination and stomatal conductance in Spartina grasses
Source Marine Ecology-Progress Series
Author Keywords salt stress; photosynthesis; Spartina; delta C-13 stable isotopes gas-exchange; photosynthesis; fractionation; efficiency; leaves; plants; halophytes; ratio
Abstract High salinity levels have long been recognized as an important environmental factor influencing plant growth and performance. Salt stress and concomitant water stress are likely to affect photosynthesis by reductions in stomatal conductance necessary to prevent loss of water vapor. Despite inundation with saline water, salt marsh communities exhibit high primary productivity. This study tested the effects of 0 to 40 parts per thousand salinity on leaf carbon isotope discrimination (Delta), leaf stomatal conductance (g(s)), and leaf conductance to CO2 (g(CO2)) in the emergent estuarine C-4 grasses Spartina alterniflora, S. anglica, and S. patens. A increased with increasing salinity in greenhouse and growth chamber experiments. g, and gCO(2) peaked at moderate salinity levels (10 to 20 parts per thousand) but significantly decreased at higher salinities in all species.
Author Address Washington State Univ, Sch Biol Sci, Pullman, WA 99164 USA. Maricle, BR, Washington State Univ, Sch Biol Sci, POB 644236, Pullman, WA 99164 USA. bmaricle@mail.wsu.edu
29-Character Source Abbreviation Mar. Ecol.-Prog. Ser.
Year Published 2006
Volume 313
Beginning Page 305-310
Unique Article Identifier ISI:000238837300026
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