Abstract:
:Extraction of maize (Zea mays) leaves by progressive grinding under suitably protective conditions yields total carbonic anhydrase activities (4800 units per milligram chlorophyll) comparable to the activity in spinach (Spinacia oleracea) leaves. The total ribulose diphosphate carboxylase activity was also equal to or greater than the best literature values for maize. Of the total leaf carbonic anhydrase, 72.5% on a chlorophyll basis was present in the mesophyll cells and 14.2% in the bundle-sheath cells. The distribution of the total leaf ribulose diphosphate carboxylase between the mesophyll and bundle-sheath cells was 42.0 and 48.7% respectively. There was three times as much total chlorophyll in extracts of the mesophyll cells compared with the bundle-sheath cells of maize. Similar results for the above distribution of the two enzymes were found using a differential grinding technique. The possible function of carbonic anhydrase in photosynthesis is discussed. The equal distribution of ribulose diphosphate carboxylase activity between the mesophyll and bundle-sheath cells casts doubt upon the hypothesis that a rigid biochemical compartmentation exists between these cell types in maize.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Poincelot RPdoi
10.1104/pp.50.3.336subject
Has Abstractpub_date
1972-09-01 00:00:00pages
336-40issue
3eissn
0032-0889issn
1532-2548journal_volume
50pub_type
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