Name: Fabiano Caprini Volponi
Type: MSc dissertation
Publication date: 02/03/2018
Advisor:
Name |
Role |
|---|---|
| Paulo Cezar Cavatte | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| Camilla Rozindo Dias Milanez | Internal Alternate * |
| Elias Terra Werner | Internal Examiner * |
| Felipe Zamborlini Saiter | External Examiner * |
| Geraldo Rogério Faustini Cuzzuol | Co advisor * |
| José Eduardo Macedo Pezzopane | External Alternate * |
| Paulo Cezar Cavatte | Advisor * |
Summary: ABSTRACT
The environmentally heterogeneous restinga forests provide an excellent opportunity
to the investigation of the seasonal dynamics of non-structural carbohydrate and cellwall polymers, which are considered most abundant biomolecules in nature. This
study was performed in a patch of restinga florest at Paulo Cesar Vinha State Park,
Guarapari municipality of Espirito Santo State, whose plant communities are
distributed along three contrasting sites across a steep flooding gradient [periodically
floodable (PF), transition (TR), and non-floodable (NF)]. Such a strong environmental
gradient reflect in the occurrence of restrict (only found in one site) and widely
distributed wood plant species throughout the study area. The goal of this study it
was evaluate the non-structural carbohydrates contents (glucose, fructose, sucrose
and starch) and cell-wall polymers (cellulose, hemicellulose and lignin) in branches,
trunks and leaves of individuals of Eugenia bahiensis (NF site abundant), Guarea
macrophylla (TR site abundant), Calophyllum brasiliense (PF abundant) and Protium
icicariba widely spreaded out along the three sites. This dissertation it was organized
in two chapters. In the first one it was investigated the variation on content of carbon
biomolecules in a P. icicariba population distributed throughout the three forest areas.
Consistent differences were found between the NF and PF zones. Leaves of
individuals of NFs zone showed higher content of sucrose, starch and hemicellulose
in relation to those of PF. On the other hand, higher content of cellulose and lignin
were observed in leaves of individuals in the PF zone. The variation of non-structural
carbohydrates and cell-wall polymers have been mainly associated to water
availability, and likely the influence of soil nutrients content, parasitism and herbivory.
In the second chapter, was studied the seasonal effect (winter and summer) over the
carbon biomolecules carbon in vegetative organs (stems, branches and leaves) of C.
brasiliense, G. macrophylla and E. bahienses. Hemicelluloses content were higher on
winter and lower on summer season, regardless of species and organ. Sucrose
contents in leaves were higher during the summer. The cellulose and lignin
molecules didnt exhibit consistent variation, being more influenced by the content
variation of other molecules. The remobilization of reserve molecules, mainly
hemicellulose, were recorded during the summer, and was associated with an
increase of the energy demand to underlie the reproductive growth.
Key words: Cellulose hemicelluloses lignin starch sucrose water stress
