TABLE 3

Carbohydrate levels, photosynthetic parameters, and chlorophyll content in wild-type and psc mutant plants

ParameterWild typepsc greenpsc chlorotic
Sucrosea18.54 ± 0.9922.67 ± 2.1343.54* ± 1.15
Glucosea0.39 ± 0.050.43 ± 0.093.60* ± 0.16
Fructosea0.80 ± 0.030.92 ± 0.142.18* ± 0.39
Starcha23.65 ± 2.2322.07 ± 2.4541.33* ± 3.34
Photosynthetic rateb41.78 ± 1.7340.63 ± 1.301.70* ± 0.28
Stomatal conductanceb0.196 ± 0.010.20 ± 0.010.017* ± 0.004
Chlorophyll contentc51.3 ± 2.651.6 ± 2.616.1* ± 3.7
  • *Significantly different from wild type at P ≤ 0.05 using Student's t-test.

  • a Data represent means of six samples ± the standard error. Units are mg per g fresh weight. Tissue was collected from summer nursery grown material at 8 pm.

  • b Data represent means of six samples ± the standard error. Units for photosynthesis rate are μmol CO2 fixed m−2 s−1 and units for stomatal conductance measurements are μmol.

  • c Chlorophyll content (N = 25) is expressed in relative units.