dc.contributor | Ponzo, Andrea Pereira Luizi | |
dc.contributor | http://lattes.cnpq.br/ | |
dc.contributor | Caldeira, Isabela Crespo | |
dc.contributor | Resende, Cristiano Ferrara de | |
dc.contributor | Almeida, Rafael Marques | |
dc.contributor | Peixoto, Paulo Henrique Pereira | |
dc.creator | Costa, Juliana da Costa Silva e | |
dc.date | 2019-10-24T12:05:07Z | |
dc.date | 2020-10-01 | |
dc.date | 2019-10-24T12:05:07Z | |
dc.date | 2019-02-28 | |
dc.date.accessioned | 2023-09-29T16:01:52Z | |
dc.date.available | 2023-09-29T16:01:52Z | |
dc.identifier | https://repositorio.ufjf.br/jspui/handle/ufjf/11206 | |
dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/9134547 | |
dc.description | Plagiochila (Dumort.) Dumort is a group of great importance among bryophytes due to
its taxonomic and ecologic implications and it is the richest and more complex genus in
Plagiochilaceae, possessing proximally 700 accepted names. Despite the various attempts
made to solve taxonomic issues, there are few studies on Plagiochila dealing with
palynological and reproductive investigations. Thus, the goals of this dissertation were to
develop a palynological study of Plagiochila (Dumort.) Dumort. (Chapter one) and to
investigate the strategies regarding the reproductive biology (Chapter two) and
desiccation tolerance (Chapter three) of one species belonging to this genus. To develop
the palynological study, spores of seventeen species of Plagiochila were analyzed
following standard palynological techniques and observed through light and electron
microscopy; morphological and ultrastructural data were obtained and interpreted
considering their relevance to taxonomy. Plagiochila porelloides was the species selected
as model to perform the reproductive biology and water stress tolerance studies. For the
first, we assessed the sex ratio and fertilization success to test for sex ratio variation
among populations and for possible relationships between the sex ratio and environmental
factors. For the latter, field collected healthy plants, among male and female individuals
from three different population, were subjected to a desiccation tolerance assay at 40%
of RH for a period of 22 h, pursuing fordesiccation tolerance ability and any sex
differences in tolerance. Our results demonstrate that the spores were found to be apolar,
spheroidal, released in monads, and varying in size from 13μm to 58μm (small to large
size). The sporoderm comprises three layers and, based on spore surface ornamentation
(variable granules in shape and morphology), species were assembled into four different
spore types. Hierarchical cluster analysis using both taxonomic and palynologic
information revealed five different groups of species. Regarding the sex ratio, the
expressed sex ratios in P. porelloides populations were heterogeneous, having a malebiased
ratio (0.375 ♀:1 ♂), and it was associated with fertilization; but no significant
relationship was found in relation to any environmental aspects. Concerning to water
stress, P. porelloides shoots survived the low RH of 40%, demonstrating that the species
is DT; females were found to be more DT than males. Our finds bring important
information about spore morphology and reproductive ecology for Plagiochila, revealing
the importance of spore description in further phylogenetic studies, and the relevance of
sex ratio and sex differences in water stress tolerance to reproductive biology and
population dynamics. | |
dc.description | - | |
dc.language | eng | |
dc.publisher | Universidade Federal de Juiz de Fora (UFJF) | |
dc.publisher | Brasil | |
dc.publisher | ICB – Instituto de Ciências Biológicas | |
dc.publisher | Programa de Pós-graduação em Ecologia | |
dc.publisher | UFJF | |
dc.rights | Acesso Embargado | |
dc.rights | http://creativecommons.org/licenses/by-nc-nd/3.0/br/ | |
dc.subject | Bryophytes | |
dc.subject | Desiccation tolerance | |
dc.subject | Ecology | |
dc.subject | Liverwort | |
dc.subject | Male bias | |
dc.subject | Palynology | |
dc.subject | Reproductive ecology | |
dc.subject | Sex ratio | |
dc.subject | Spore | |
dc.subject | Sporoderm | |
dc.subject | CNPQ::CIENCIAS BIOLOGICAS::ECOLOGIA | |
dc.title | Palynology and aspects of reproductive biology of Plagiochila (dumort.) Dumort. (Plagiochilaceae) | |
dc.type | Tese | |