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Plant Physiology 71:425-431 (1983)
© 1983 American Society of Plant Biologists

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Articles

Photosynthesis of Grass Species Differing in Carbon Dioxide Fixation Pathways 1

VIII. Ultrastructural Characteristics of Panicum Species in the Laxa Group

R. Harold Brown, Joseph H. Bouton, Luanne Rigsby and Mark Rigler

Department of Agronomy, University of Georgia, Athens, Georgia 30602

Ultrastructural studies of leaves of seven Panicum species in or closely related to the Laxa group and classified as C3, C4 or C3-C4 intermediate were undertaken to examine features associated with C3 and C4 photosynthesis. The C3 species Panicum rivulare Trin. had few organelles in bundle sheath cell profiles (2 chloroplasts, 1.1 mitochondria, and 0.3 peroxisomes per cell section) compared to an average of 10.6 chloroplasts, 17.7 mitochondria, and 3.2 peroxisomes per bundle sheath cell profile for three C3-C4 species, Panicum milioides Nees ex Trin., Panicum decipiens Nees ex Trin. and Panicum schenckii Hack. However, two other C3 species, Panicum laxum Sw. and Panicum hylaeicum Mez, contained about 0.7, 0.5, and 0.3 as many chloroplasts, mitochondria, and peroxisomes, respectively, as in bundle sheath cell profiles of the C3-C4 species. Chloroplasts and mitochondria in bundle sheath cells were larger than those in mesophyll cells for the C4 species Panicum prionitis Griseb. and the C3-C4 species, but in C3 species the organelles were similar in size or were smaller in the bundle sheath cells. The C3-C4 species and P. laxum and P. hylaeicum exhibited an unusually close association of organelles in bundle sheath cells with mitochondria frequently surrounded in profile by chloroplasts. The high concentrations in bundle sheath cells of somewhat larger organelles than in mesophyll cells correlates with the reduced photorespiration of the C3-C4 species.

1 Supported by state and Hatch funds allocated to the Georgia Agricultural Experiment Stations and the United States Department of Agriculture, Agricultural Research Service, under Grant 5901-0410-8-0181-0 from the Competitive Research Grants Office.




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O. Ueno, S. W. Bang, Y. Wada, A. Kondo, K. Ishihara, Y. Kaneko, and Y. Matsuzawa
Structural and Biochemical Dissection of Photorespiration in Hybrids Differing in Genome Constitution between Diplotaxis tenuifolia (C3-C4) and Radish (C3)
Plant Physiology, July 1, 2003; 132(3): 1550 - 1559.
[Abstract] [Full Text] [PDF]


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Copyright © 1983 by the American Society of Plant Biologists