Distribution of photosynthetic enzymes between mesophyll, specialized parenchyma and bundle sheath cells of Arundinella hirta [C4-dicarboxylic acid pathway]

Arundinella hirta L. is a C4 plant having an unusual C4 leaf anatomy. Besides mesophyll and bundle sheath cells, A. hirta leaves have specialized parenchyma cells which look morphologically like bundle sheath cells but which lack vascular connections and are located between veins, running parallel t...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1979-01, Vol.63 (1), p.209-212
Main Authors: Reger, B.J, Yates, I.E
Format: Article
Language:English
Subjects:
Bundle sheath cells
C4 plants
Enzymes
Leaves
Mesophyll
Mesophyll cells
Parenchyma
Plant cells
Plants
Protoplasts
Short Communications
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Summary:Arundinella hirta L. is a C4 plant having an unusual C4 leaf anatomy. Besides mesophyll and bundle sheath cells, A. hirta leaves have specialized parenchyma cells which look morphologically like bundle sheath cells but which lack vascular connections and are located between veins, running parallel to them. Activities of phosphoenolpyruvate and ribulose-1,5-bisphosphate carboxylases and phosphoenolpyruvate carboxykinase, NADP-and NAD-malic enzymes were determined for whole leaf extracts and isolated mesophyll protoplasts, specialized parenchyma cells, and bundle sheath cells. The data indicate that A. hirta is a NADP-malic enzyme type C4 species. In addition, specialized parenchyma cells and bundle sheath cells are enzymatically alike. Compartmentation of enzymes followed the C4 pattern with phosphoenolpyruvate carboxylase being restricted to mesophyll cells while ribulose-1,5-bisphosphate carboxylase and decarboxylating enzymes were restricted to bundle sheath and specialized parenchyma cells.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.63.1.209