TY - JOUR
T1 - Karyotype characterization of eight Mexican species of Eleocharis (Cyperaceae)
AU - Tena-Flores, Jorge Alberto
AU - González-Elizondo, María Socorro
AU - Herrera-Arrieta, Yolanda
AU - Almaraz-Abarca, Norma
AU - Mayek-Pérez, Netzahualcóyotl
AU - Da Silva, Carlos Roberto Maximiano
AU - Vanzela, André Luís Laforga
PY - 2013/6
Y1 - 2013/6
N2 - Karyotypes of 49 populations belonging to eight species of Mexican Eleocharis (Cyperaceae) are described. Chromosome numbers for Eleocharis densa, E. reznicekii, and E. rostellata are reported for the first time and new numbers are reported for E. macrostachya, E. xyridiformis, and the E. montevidensis complex. Numbers ranged from 2n = 10 to 2n = 60. Dysploidy was the most common mechanism of karyotype variation, which has been detected in four species (E. densa, E. macrostachya, E. reznicekii, and E. xyridiformis). Two species are diploid (Eleocharis parishii and E. cf. montevidensis) and three are polyploid (E. acicularis, E. montevidensis, and E. rostellata). Except for specimens of E. montevidensis complex, no intraspecific variation in chromosome number was found. However, differences in the chromosome sizes were found among populations of that complex and in E. rostellata. Mean lengths of diploid set ranged from 12.96 μm in E. montevidensis to 178.25 μm in E. rostellata and the average of chromosomes sizes varied from 0.97 μm in E. montevidensis to 6.01 μm in E. xyridiformis. These two taxa presented an extreme interchromosomal asymmetry A2: 0.12 and 0.43. Absence of primary constrictions was confirmed. Taxonomical implications of the karyological data are discussed.
AB - Karyotypes of 49 populations belonging to eight species of Mexican Eleocharis (Cyperaceae) are described. Chromosome numbers for Eleocharis densa, E. reznicekii, and E. rostellata are reported for the first time and new numbers are reported for E. macrostachya, E. xyridiformis, and the E. montevidensis complex. Numbers ranged from 2n = 10 to 2n = 60. Dysploidy was the most common mechanism of karyotype variation, which has been detected in four species (E. densa, E. macrostachya, E. reznicekii, and E. xyridiformis). Two species are diploid (Eleocharis parishii and E. cf. montevidensis) and three are polyploid (E. acicularis, E. montevidensis, and E. rostellata). Except for specimens of E. montevidensis complex, no intraspecific variation in chromosome number was found. However, differences in the chromosome sizes were found among populations of that complex and in E. rostellata. Mean lengths of diploid set ranged from 12.96 μm in E. montevidensis to 178.25 μm in E. rostellata and the average of chromosomes sizes varied from 0.97 μm in E. montevidensis to 6.01 μm in E. xyridiformis. These two taxa presented an extreme interchromosomal asymmetry A2: 0.12 and 0.43. Absence of primary constrictions was confirmed. Taxonomical implications of the karyological data are discussed.
KW - Chromosome
KW - Cytotaxonomy
KW - Dysploidy
KW - Holocentric
KW - Sedges
UR - http://www.scopus.com/inward/record.url?scp=84883297307&partnerID=8YFLogxK
M3 - Artículo
SN - 2007-4298
VL - 91
SP - 119
EP - 128
JO - Botanical Sciences
JF - Botanical Sciences
IS - 2
ER -