The distribution and ultrastructure of chloroplasts in leaves differing in photosynthetic carbon metabolism. I. Wheat, Sorghum, and Aristida (Gramineae)

Bisalputra, T. and Downton, W.J.S. and Tregunna, E.B. (1969) The distribution and ultrastructure of chloroplasts in leaves differing in photosynthetic carbon metabolism. I. Wheat, Sorghum, and Aristida (Gramineae). Canadian Journal of Botany, 47 (1). pp. 15-21.

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Abstract

The ultrastructure of the chlorenchymatous tissues around the vascular bundles of three different types of grass leaves is described. In the temperate grass leaf, as exemplified by wheat, the inner mestom sheath contains proplastids. Normal chloroplasts are found only within the mesophyll cells. Smaller chloroplasts occur in cells of the ill-defined parenchymatic bundle sheath. This type of leaf has the photosynthetic pathway described by Calvin and a high carbon dioxide compensation value. In the tropical grasses, Sorghum and Aristida, the new photosynthetic pathway proposed by Hatch et al. and low carbon dioxide compensation are correlated with development of the parenchymatic bundle sheath. Cytological evidence indicates that cells of the bundle sheath are much more active than the surrounding mesophyll tissue. The specialized chloroplasts of the bundle sheath cells may be responsible for the physiological and biochemical differences between leaves of tropical and temperate grasses.

Item Type:	Article
Author Affiliation:	Botany Department, University of British Columbia, Vancouver, British Columbia
Subjects:	Plant Production
Divisions:	Sorghum
Depositing User:	Sandhya Gir
Date Deposited:	02 Nov 2010 22:59
Last Modified:	02 Nov 2010 22:59
Official URL:	http://dx.doi.org/10.1139/b69-003
URI:	http://eprints.icrisat.ac.in/id/eprint/458

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