dc.contributor | Oliveira, João Marcelo Santos de | |
dc.contributor | http://lattes.cnpq.br/3533863401498975 | |
dc.contributor | Essi, Liliana | |
dc.contributor | Pelegrin, Carla Maria Garlet de | |
dc.contributor | Chies, Tatiana Teixeira de Souza | |
dc.creator | Fritzen, Amanda | |
dc.date.accessioned | 2023-04-10T17:32:36Z | |
dc.date.accessioned | 2023-09-04T19:26:08Z | |
dc.date.available | 2023-04-10T17:32:36Z | |
dc.date.available | 2023-09-04T19:26:08Z | |
dc.date.created | 2023-04-10T17:32:36Z | |
dc.date.issued | 2023-02-09 | |
dc.identifier | http://repositorio.ufsm.br/handle/1/28593 | |
dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/8625886 | |
dc.description.abstract | Despite a general morphological distinction within the Calothecinae subtribe, the taxonomy of
Chascolytrum is still challenging. The understanding of species in the genus has been
hampered, mainly, by the overlapping of floral morphological characteristics, leading to
different taxonomic treatments, especially when we talk about the relationship between
Chascolytrum subaristatum and Chascolytrum erectum, which differ in size and color of
spikelets. Molecular studies have remained controversial, where the two species have already
been synonymized and later distinguished. In addition to the molecular data, it was
determined that the apex of the leaves and the root structure can also help in the identification,
however, due to the wide distribution of the species, it is possible that these characters suffer
some environmental influence, and reproductive organs may be more stable. Therefore, the
objective was to comparatively analyze aspects related to the carpel and ovule and
morphometrically evaluate the floral characteristics in order to provide additional characters
for a review of the limits between the two taxa. Also, it was analyzed which edaphic
components can contribute to the morphological variation of individuals. For this, 15
populations from each population were gathered, in a total of four populations, two
populations for each species. The inflorescences were fixed for further dissection for
morphometric analysis and processed according to usual methods for microscopy. Qualitative
characteristics were observed and, for the measurements, 11 quantitative characters referring
to the floral structures and five axes and two areas for the carpel and ovule were determined.
The vegetative organs were collected for chemical and physical analysis of the plant tissue, as
well as a soil sample for each individual. It was not possible to group the populations of each
species separately and, therefore, to differentiate them. All characters included from the carpel
and seminal rudiment respect the variation pattern for Pooideae, except for the presence of
three layers in the inner tegument in the basal portion in the region close to the chalazal end
and the presence of four plant cells in the distal pole of the dorsal wall of the , which were
described for the first time in the subfamily. It is assumed that the qualitative characters,
previously used to differentiate the two species, such as spikelet colors, may be influenced by
edaphic characteristics, as well as the characters that influence the total flower size, such as
inflorescence length, lemma length and length of the glumes, and may be good population
markers. | |
dc.publisher | Universidade Federal de Santa Maria | |
dc.publisher | Brasil | |
dc.publisher | Ciências Biológicas | |
dc.publisher | UFSM | |
dc.publisher | Programa de Pós-Graduação em Agrobiologia | |
dc.publisher | Centro de Ciências Naturais e Exatas | |
dc.rights | http://creativecommons.org/licenses/by-nc-nd/4.0/ | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 International | |
dc.subject | Morfometria | |
dc.subject | Carpelo | |
dc.subject | Rudimento seminal | |
dc.subject | Composição do solo | |
dc.subject | Morphometry | |
dc.subject | Carpel | |
dc.subject | Ovule | |
dc.subject | Soil composition | |
dc.title | Contribuições à taxonomia do complexo Chascolytrum subaristatum (Lam.) Desv. x Chascolytrum erectum (Lam.) Desv. (Poaceae, Pooideae, Poeae, Calothecinae) | |
dc.type | Dissertação | |