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Hill reaction activity in isolated chloroplasts from wolffia arrhiza cultivated under white blue or red radiation under different chemostat steady states


, : Hill reaction activity in isolated chloroplasts from wolffia arrhiza cultivated under white blue or red radiation under different chemostat steady states. Photosynthetica (Prague) 17(1): 28-33

The effects of quality of radiation (white (W), blue (B), red (R) radiation: 5.5 W m-2) which was applied during plant cultivation as well as the influences of effectors (1,5-diphenyl carbazide.sbd.DPC, boron, 3-(3,4-dichlorophenyl)-1,1-dimethylurea.sbd.DCMU) on Hill reaction activity (HRA) of isolated chloroplasts from W. arrhiza (L.) WIMM. are dependent on the chemostat growth rates (.mu. = 0.006 or 0.015 h-1). In comparison with W plants HRA was decreased in R plants, whereas in B plants it was stimulated (higher .mu.) or reduced (lower .mu.). The HRA of R plants grown at higher .mu. was reduced under all test conditions, and the same was true for B plants in most cases. In comparison with untreated controls DPC increased HRA in R plants independently of .mu. whereas this finding was observed in W and B plants only with higher .mu. Boron inhibited HRA but this inhibition was stronger in B and R plants grown at higher .mu.; this has also been found in the combination boron + DPC. In W plants the DCMU-inhibition was stronger with lower .mu. than with higher .mu., but in R plants it was the reverse.

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