Salinity effects on photosynthesis and growth in Alternanthera philoxeroides (Mart. ) Griseb
Alternanthera philoxeroides, alligator weed, was grown at five different NaCl concentrations to determine the effect of salinity on factors related to the net rate of CO/sub 2/ uptake (P/sub n/). Over the range of 0 to 400 millimolar NaCl, P/sub n/ declined 51%. Stomatal conductance declined in parallel with P/sub n/ and as a result there was no reduction in intercellular CO/sub 2/ concentrations and therefore no reduction in the amount of CO/sub 2/ available for photosynthesis. The CO/sub 2/ compensation point did not change with salt stress. Increases in leaf thickness tended to compensate slightly for the negative effects of salinity on leaf cell metabolism, at least in relation to P/sub n/. On a mesophyll cell area basis, soluble protein was relatively constant in leaves developed at 100 to 400 millimolar NaCl while total chlorophyll decreased at all salinities. Dry weight production and P/sub n/ were closely correlated in alligator weed grown at different salinities. Plants produced less leaf area per unit dry weight as salinity increased, which may aid in water conservation. 26 references, 5 figures, 2 tables.
- Research Organization:
- Louisiana State Univ., Baton Rouge, LA (United States)
- OSTI ID:
- 5930332
- Journal Information:
- Plant Physiol.; (United States), Vol. 75:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBON DIOXIDE
UPTAKE
SALINITY
BIOLOGICAL EFFECTS
WEEDS
PHOTOSYNTHESIS
PLANT GROWTH
CHLOROPHYLL
DOSE-RESPONSE RELATIONSHIPS
LEAVES
METABOLISM
PROTEINS
SODIUM CHLORIDES
STOMATA
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
GROWTH
HALIDES
HALOGEN COMPOUNDS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
OPENINGS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHYTOCHROMES
PIGMENTS
PLANTS
PORPHYRINS
SODIUM COMPOUNDS
SYNTHESIS
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)