TY - JOUR
T1 - Ornamentation of achene silica walls and its contribution to the systematics of Eleocharis (Cyperaceae)
AU - da Silva, Carlos Roberto Maximiano
AU - da Silva, Leandro Bento
AU - de Andrade, Célia Guadalupe Tardelli Jesus
AU - Trevisan, Rafael
AU - González-Elizondo, María Socorro
AU - Vanzela, André Luís Laforga
N1 - Funding Information:
This study was supported by the Brazilian agencies Fundação Araucária, CNPq and ProPPG-UEL. Dr. A. Leyva and M.S. Bryan L. Sharp helped with English editing of the manuscript. The valuable suggestions of two anonymous reviewers are gratefully acknowledged.
PY - 2012/2
Y1 - 2012/2
N2 - Micromorphology of the achene surface of 26 Brazilian species of Eleocharis was studied by scanning electron microscopy in order to evaluate its usefulness in the taxonomy of the genus. The results point out two patterns of cell organization according to silica structures of achenes. The first corresponds to a group of species (group A) that have small to medium cells arranged vertically. The second is found in those species (group B) with medium to large cells arranged horizontally. These data were useful in separating species of Eleocharis subgenus Scirpidium and E. subgenus Limnochloa (group B) from E. subgenus Eleocharis (group A). However, group A shows considerable variation in silica wall arrangement. Eleocharissquamigera, previously considered as part of E. subgenus Eleocharis, shows features rather similar to those of Scirpidium, confirming recent phylogenies. The subgenus Limnochloa was clearly distinguished from others by achenes with large cells (over 55 μm width), presence of crenate or repand anticlinal walls, and some orifices near the wall in some species. The silica wall ornamentation seems to be a useful morphological tool for studying relationships between subgenera and distinguishes Limnochloa from the other subgenera.
AB - Micromorphology of the achene surface of 26 Brazilian species of Eleocharis was studied by scanning electron microscopy in order to evaluate its usefulness in the taxonomy of the genus. The results point out two patterns of cell organization according to silica structures of achenes. The first corresponds to a group of species (group A) that have small to medium cells arranged vertically. The second is found in those species (group B) with medium to large cells arranged horizontally. These data were useful in separating species of Eleocharis subgenus Scirpidium and E. subgenus Limnochloa (group B) from E. subgenus Eleocharis (group A). However, group A shows considerable variation in silica wall arrangement. Eleocharissquamigera, previously considered as part of E. subgenus Eleocharis, shows features rather similar to those of Scirpidium, confirming recent phylogenies. The subgenus Limnochloa was clearly distinguished from others by achenes with large cells (over 55 μm width), presence of crenate or repand anticlinal walls, and some orifices near the wall in some species. The silica wall ornamentation seems to be a useful morphological tool for studying relationships between subgenera and distinguishes Limnochloa from the other subgenera.
KW - Achenes
KW - Micromorphology
KW - Scanning electron microscopy
KW - Silica wall
UR - http://www.scopus.com/inward/record.url?scp=84856235684&partnerID=8YFLogxK
U2 - 10.1007/s00606-011-0552-x
DO - 10.1007/s00606-011-0552-x
M3 - Artículo
SN - 0378-2697
VL - 298
SP - 391
EP - 398
JO - Plant Systematics and Evolution
JF - Plant Systematics and Evolution
IS - 2
ER -