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Abstract Detail



Developmental and Structural Section

Clark, Lynn [1], Sanchez-Ken, Jorge [2], Cox, Monica [3].

3-D Reconstruction of Chlorenchyma Cells in Oplismenus, a C3 Forest-dwelling Grass (Poaceae: Panicoideae: Paniceae).

Most of the available information on grass leaf anatomy comes from transverse (cross) sections. Relatively few studies have also examined grass leaves in longitudinal section, and fewer still have looked at them in paradermal view. Some work, however, including unpublished observations by Sanchez-Ken, indicates that chlorenchyma cell variation in grasses is more extensive than previously suspected. As part of a broad survey of chlorenchyma cell structure and evolution in the Poaceae, we report the results of our initial 3-D reconstruction of chlorenchyma cells in Oplismenus hirtellus, a broad-leaved, C3 grass that represents the "forest shade" clade (subtribe Boivinellinae) within the diverse tribe Paniceae. In this species, chlorenchyma cells adjacent to the bundles are cylindrical and elongated and more or less radiate, curving toward the adaxial epidermis. Chlorenchyma cells in the intercostal zone or adjacent to the abaxial epidermis below the bundles are mostly more or less isodiametric but can be rectangular or irregularly shaped longitudinally. Above and near the bundles, chlorenchyma cells adjacent to the adaxial epidermis form a palisade-like layer that is best developed in the longitudinal plane. Other interesting features include relatively close cell packing in all dimensions and bundle sheath extensions that are poorly developed to absent. Consistent with the C3 pathway, bundles are separated by 8-10 chlorenchyma cells, but the enlarged outer (parenchyma) sheath cells contain well developed chloroplasts.

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1 - Iowa State University, Department of Ecology, Evolution, And Organismal Biology, 251 BESSEY HALL, AMES, IA, 50011-1020, USA
2 - Universidad Nacional Autonoma De Mexico, Botanica, 3er Circuito De Cd. Universitaria, Del Coyoacan, Mexico, D.F., N/A, 04510, Mexico
3 - Iowa State University, Ecology, Evolution and Organismal Biology, 251 Bessey Hall, Ames, IA, 50011-1020, USA

Keywords:
chlorenchyma cell structure
Poaceae
Paniceae
forest grasses.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Grand Salon A - D/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 5:30 PM
Number: PDS017
Abstract ID:704
Candidate for Awards:None


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