Abstract Detail

Anatomy and Morphology

Lima, Jamile Fernandes [1], Leite, Kelly Regina Batista [2], Clark, Lynn [3], Oliveira, Reyjane Patricia de [1].

Foliar epidermal micromorphology of representatives of Olyra and related genera in Olyrinae (Olyreae, Bambusoideae, Poaceae).

The epidermal microcharacters on leaves show important taxonomic characters in members of Poaceae, at several hierarchical levels. These characters also have been useful in the delimitation of representatives of Bambusoideae and evolutionary relationships have been inferred based on these data. In this study, we present information about the foliar micromorphology of members of herbaceous bamboos (tribe Olyreae), subtribe Olyrinae. We emphasize species of Olyra, the biggest and most heterogeneous genus of Olyrinae, and related genera (Arberella, Cryptochloa and Lithachne), which together form one of the four clades recovered in the molecular phylogenies in progress in this group. Scanning electron microscopy was used to examine the characters that can be useful to explain the taxonomy and/or the evolution of this group. We prioritize species that include different macromorphological patterns in Olyra (7/23 spp.) and the greatest number possible of members of the other genera [Arberella (1/7spp.), Cryptochloa (4/8 spp.) and Lithachne (2/4spp.). In all species analyzed of Cryptochloa, A. costaricensis, L. pauciflora, O. humilis and O. filiformis have hypostomatic leaves, the others being amphistomatic. Most of the species exhibit a pair of simple papillae on the subsidiary cells, except Cryptochloa capillata and C. variana, which have lobed papillae. In each subsidiary cell of O. ciliatifolia four papillae with bilobed extremities occur, forming a chamber over the stomatal pore, and in O. latifolia the papillae are absent from the subsidiary cells. The papillae on the long cells are simple in most species, being absent in O. latifolia and O. longifolia and branched in A. costaricensis. In addition to the papillae, the species analyzed possessed bicellular microhairs, long unicellular trichomes and prickle hairs, with the bicellular microhairs being most common. O. humilis was the only species that did not have any of the three microstructures. We did not observe informative characters at the generic level, but at least in principle, several species were characterized by the data presented, confirming the utility of these characters in taxonomic studies in this group. On the other hand, their usefulness to explain the relationships recovered in molecular phylogenies cannot yet be inferred, as greater sampling within each genus is still needed. We thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq/Brazil) for support by Doctorate scholarship to JFL (Process 23038.014005/2016-63).

1 - State University of Feira de Santana, Av. Transnordestina s/n, Novo Horizonte, Feira de Santana, BA, 44036-900, Brazil
2 - Federal University of Bahia, Biology Institute , Street Barão de Geremoabo, 147 - Campus de Ondina, Salvador, BA, 40170-290, Brazil
3 - Iowa State University, Department Of Ecology, Evolution, And Organismal Biology, 251 Bessey Hall, Ames, IA, 50011-1020, USA

Keywords:
herbaceous bamboos
papillae
prickle hairs
microhairs.

Presentation Type: Poster
Session: P, Anatomy and Morphology
Location: Exhibit Hall/Omni Hotel
Date: Monday, June 26th, 2017
Time: 5:30 PM This poster will be presented at 5:30 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PAM005
Abstract ID:333
Candidate for Awards:Katherine Esau Award,Developmental and Structural Section best poster