Table II.

Inhibition of PEPC by malate [I50 (malate)] in soluble protein extracts from leaves of the single-cell functioning C4 species B. sinuspersici and S. aralocaspica and related chenopod species

Samples were taken after 5 h into the light and dark periods. PEPC from crude extracts was assayed at pH 7.2, 0.1 mm PEP. Values represent the mean of at least three independent determinations (ses are shown).

SpeciesPhotosynthetic TypeI50 (malate)I50 (malate)Light/Dark
LightDark
mm
B. sinuspersiciSingle-cell C42.22 ± 0.032.00 ± 0.251.11
0.60 ± 0.02a0.23 ± 0.02a2.61a
S. aralocaspicaSingle-cell C40.69 ± 0.070.33 ± 0.062.09
H. persicumKranz C41.91 ± 0.040.47 ± 0.054.06
S. eltonicaKranz C40.89 ± 0.050.26 ± 0.013.42
S. richteriKranz C42.17 ± 0.111.25 ± 0.141.74
S. linifoliaC33.93 ± 0.063.90 ± 0.111.01
  • a With B. sinuspersici, PEPC was also assayed at pH 7.2 with 0.055 mm PEP.