Table I.

Phenotypic responses of salt-tolerant FL478 and salt-sensitive IR29

Both genotypes were characterized for their response to salinity stress by measurement of shoot Na+ and K+ concentrations, chlorophyll content, total anthocyanin content, net photosynthetic rate, stomatal conductance, and transpiration rate (Tr).

Shoot IonsaTreatmentShoot Na+Shoot K+Shoot Na+-to-K+ Ratio
mmol kg−1mmol kg−1
FL478 control38.6 ± 1.01035.0 ± 43.30.04
FL478 salt253.6 ± 10.4827.0 ± 31.00.31
IR29 control39.1 ± 1.81028.6 ± 61.70.04
IR29 salt336.0 ± 3.6747.6 ± 27.20.44
PigmentsaTreatmentChlorophyll aChlorophyll bAnthocyanins
mg d−1m−2mg d−1 m−2mg d−1 m−2
FL478 control2.85 ± 0.140.78 ± 0.150.28 ± 0.08
FL478 salt3.16 ± 0.340.77 ± 0.110.26 ± 0.04
IR29 control2.62 ± 0.060.63 ± 0.050.20 ± 0.02
IR29 salt3.10 ± 0.290.71 ± 0.110.24 ± 0.02
PhotosyntheticbTreatmentPhotosynthesisConductanceTr
μmol m−2 s−1mol water m−2 s−1mmol water m−2 s−1
FL478 control26.03 ± 3.990.95 ± 0.1713.03 ± 2.05
FL478 salt25.88 ± 2.140.62 ± 0.109.33 ± 1.29
IR29 control24.48 ± 3.390.61 ± 0.169.39 ± 1.97
IR29 salt25.41 ± 3.680.47 ± 0.077.46 ± 1.18

  • ↵a Results are mean values of three replicates ±se. Each replicate was derived from two plants.

  • ↵b Results are mean values of six replicates ±se.