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Comparative Bundle Sheath and Mesophyll Differentiation in the Leaves of the C 4 Grasses Panicum effusum and P. bulbosum

1986; Wiley; Volume: 73; Issue: 10 Linguagem: Inglês

10.2307/2443848

1537-2197

Nancy G. Dengler, Ronald E. Dengler, P. W. Hattersley,

Ruminant Nutrition and Digestive Physiology

American Journal of BotanyVolume 73, Issue 10 p. 1431-1442 Article COMPARATIVE BUNDLE SHEATH AND MESOPHYLL DIFFERENTIATION IN THE LEAVES OF THE C4 GRASSES PANICUM EFFUSUM AND P. BULBOSUM Nancy G. Dengler, Nancy G. Dengler Department of Botany, University of Toronto, Toronto, Ontario, M5S 1A1 CanadaSearch for more papers by this authorRonald E. Dengler, Ronald E. Dengler Life Sciences Division, Scarborough College, University of Toronto, Westhill, Ontario, M1C 1A4 CanadaSearch for more papers by this authorPaul W. Hattersley, Paul W. Hattersley Taxonomy Unit, Research School of Biological Sciences, Australian National University, P.O. Box 475, Canberra, A.C.T., Australia, 2601Search for more papers by this author Nancy G. Dengler, Nancy G. Dengler Department of Botany, University of Toronto, Toronto, Ontario, M5S 1A1 CanadaSearch for more papers by this authorRonald E. Dengler, Ronald E. Dengler Life Sciences Division, Scarborough College, University of Toronto, Westhill, Ontario, M1C 1A4 CanadaSearch for more papers by this authorPaul W. Hattersley, Paul W. Hattersley Taxonomy Unit, Research School of Biological Sciences, Australian National University, P.O. Box 475, Canberra, A.C.T., Australia, 2601Search for more papers by this author First published: 01 October 1986 https://doi.org/10.1002/j.1537-2197.1986.tb10889.xCitations: 17AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract The two C4 Panicum species examined differ in C4 acid decarboxylation type and in developmental origin of bundle sheaths in major veins of their leaf blades. In Panicum effusum R.Br. (NAD-malic enzyme type) both mesophyll (PCA) and chlorenchymatous bundle sheath (PCR) cells are derived from ground meristem. In contrast, in Panicum bulbosum H.B.K. (NADP-malic enzyme type), bundle sheath cells are derived from procambium, while mesophyll develops from ground meristem. To test the hypothesis that the developmental divergence of bundle sheath and mesophyll cells would occur earlier when these two tissues had different ontogenetic origins (in P. bulbosum) than when these tissues had the same origin (in P. effusum), the development of major veins in each species was investigated. We measured cell length and cross sectional area, plastid and mitochondrial number, plastid area, vacuole area fraction, wall thickness and fraction adjacent to intercellular space using direct and digitizer measurements of transmission electron micrographs of leaf cross sections of successive developmental stages. Many of the statistically significant changes in the structural parameters measured occurred late in development of both species. The magnitude of developmental change in P. effusum PCR cells was sometimes more dramatic, viz. changes in cell and PCR plastid area, and in mitochondrion number per cell. However, earlier divergence of PCR and PCA length and volume, and wall fraction adjacent to intercellular space in P. bulbosum than in P. effusum indicates that ontogenetic origin of PCR cells from procambium could determine the timing of at least some developmental events. Citing Literature Volume73, Issue10October 1986Pages 1431-1442 RelatedInformation