ISHS


Acta
Horticulturae
Home


Login
Logout
Status


Help

ISHS Home

ISHS Contact

Consultation
statistics
index


Search
 
ISHS Acta Horticulturae 810: IX International Vaccinium Symposium

GAS EXCHANGE AND CHLOROPHYLL CONTENT OF CRANBERRY UNDER SALT STRESS

Authors:   P. Jeranyama, C.J. DeMoranville
Keywords:   Vaccinium macrocarpon, gas exchange, chlorophyll, salt, stomatal conductance, CO2 assimilation, intercellular CO2
Abstract:
Photosynthetic activity decreases when plants are grown under saline conditions leading to reduced growth and productivity. Leaf gas exchange and chlorophyll content of ‘Stevens’ cranberry exposed to increasing sodium chloride (NaCl) concentration were measured. Cranberry was grown in a sand based culture under greenhouse conditions. The NaCl concentrations in irrigation water were 0 (control), 82, 164 and 246 mg.L-1. In addition to salt solutions, plants were fertilized with a slow release NPK fertilizer. Intercellular CO2 concentration in leaves increased with increase in salinity (r=0.72, p > 0.01). Net CO2 assimilation rate decreased by 43%, as exposure rates increased from 0 to 164 mg.L-1NaCl and stomatal conductance relative to the control was reduced by 68% at 164 mg.L-1 NaCl. Stomatal conductance had a negative correlation with intercellular CO2 concentration (r=-0.53, p < 0.1). The ratio of chlorophyll a to chlorophyll b was 1:2 except at 164 mg.L-1NaCl where the ratio was 1:1. The insignificant correlation between stomatal conductance and net CO2 assimilation suggests hat physiological factors other than stomatal conductance were responsible for limiting photosynthesis under salt stress.
  • Full Text (PDF format, 280697 bytes)
  • Citation
  • Translate

Download Adobe Acrobat Reader (free software to read PDF files)

810_99     810     810_101

URL www.actahort.org      Hosted by KU Leuven      © ISHS