The distribution of carbonic anhydrase and ribulose diphosphate carboxylase in maize leaves.

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 Physiol

journal_title

Plant physiology

authors

Poincelot RP

doi

10.1104/pp.50.3.336

subject

Has Abstract

pub_date

1972-09-01 00:00:00

pages

336-40

issue

3

eissn

0032-0889

issn

1532-2548

journal_volume

50

pub_type

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