Effects of nitrogen deprivation on the ATP-sulphurylase and O-acetylserine sulphydrylase activities of mesophyll protoplasts and bundle sheath strands of maize leaves |
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Authors: | Rossella Ghisi F Anaclerio C Passera |
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Institution: | (1) Institute of Agricultural Chemistry, University of Padova, 35100 Padova, Italy |
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Abstract: | In maize leaves nitrogen (N)-deprivation induced a significant decline of chlorophyl and total N contents. On the contrary,
sulphur (S) content increased with N-deprivation. The activities of ATP-sulphurylase and O-acetylserine sulphydrylase also
decreased with N-deprivation, but ATP-sulphurylase activity was more sensitive than O-acetylserine sulphydrylase activity
to N-deficiency both in whole leaf extracts and in isolated leaf cells. Finally, N-deprivation induced higher changes in activity
of the two enzymes in mesophyll protoplasts than in bundle sheath strands.
This research was supported by Consiglio Nazionale delle Ricerche-Special grant I.P.R.A.-Subproject 1. Paper N. 73. |
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