
%0 Journal Article
%A Casati, Paula 
%A Drincovich, María Fabiana 
%A Andreo, Carlos S. 
%A Donahue, Raymon 
%A Edwards, Gerald E. 
%T UV-B, red and far-red light regulate induction of the C<emph tye="8">4</emph> isoform of NADP-malic enzyme in etiolated maize seedlings
%J Functional Plant Biology
%D 1998/10/26
%V 25
%N 6
%P 701-708
%K C4 photosynthesis, NADP-malic enzyme, UV-B radiation.
%R https://doi.org/10.1071/PP98004
%U https://www.publish.csiro.au/paper/PP98004 
%X The induction of NADP-malic enzyme (NADP-ME) in maize (Zea mays) etiolated seedlings as a function of intensity and duration of exposure to UV-B radiation was investigated by measuring changes in activity and protein, as well as by levels of NADP-ME gene transcripts. Exposures to UV radiation from 2 to 60 min including photon flux densities of UV-B of 0.5&#8211;2 mmol quanta m-2 s-1 which are well below levels which occur naturally under full sunlight, caused an increase in Me gene mRNA and NADP-ME protein, as well as in NADP-ME activity. A similar dosage of UV-A radiation was ineffective. A low level of red light (10 &#181;mol quanta m-2 s-1) for only 5 min was also effective in inducing increases in NADP-ME activity equivalent to that with UV-B radiation. A 5 min exposure to far red light (100 &#181;mol quanta m-2 s-1) following UV-B or red light treatment largely reversed the induction of NADP-ME, and this effect of far-red could be eliminated by further treatment with UV-B or red light. These results indicate that physiological levels of UV-B radiation have a positive effect on induction of the synthesis of a photosynthetic enzyme which is involved in C4 photosynthesis. 
