A. Siedlecka et al., A relationship between carbonic anhydrase and rubisco in response to moderate cadmium stress during light activation of photosynthesis, Z NATURFO C, 54(9-10), 1999, pp. 759-763
Citations number
24
Categorie Soggetti
Biochemistry & Biophysics
Journal title
ZEITSCHRIFT FUR NATURFORSCHUNG C-A JOURNAL OF BIOSCIENCES
In our previous research, we showed that low Cd concentration increases the
effectiveness of the process es leading to activation of ribulose-1,5-bisp
hosphate carboxylase/oxygen ase (Rubisco). This stimulation was dependent o
n carbonic anhydrase (CA) activity and resulted in protecting Rubisco activ
ity against Cd toxicity. The aim of the present paper was to test whether t
his mechanism has any influence on light activation of photosynthesis durin
g the first 2 h of illumination. Both the "activation mechanism" of plant r
esponse to Cd-stress conditions and its full efficiency at low Cd concentra
tion were confirmed. The CA-dependent light activation of Rubisco at low Cd
level was correlated with accelerated attaining of the maximum Rubisco act
ivity by these plants. The amount of Rubisco was also Cd- and time-dependen
t and varied from continuous accumulation in control plants till reaching t
he maximum level within 30 minutes for the high Cd concentration. An increa
se in CA activity that was found to be parallel to the decrease of the amou
nt of CA suggested activation of the enzyme by low Cd concentration.