Banca de DEFESA: RUANE VASCONCELOS BENTO DE ARAÚJO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : RUANE VASCONCELOS BENTO DE ARAÚJO
DATE: 22/01/2024
TIME: 09:00
LOCAL: Salvador, Bahia
TITLE:

Taxonomic and phylogenetic studies of Geastrum saccatum Fr. (Geastraceae, Basidiomycota)

KEY WORDS:

Basidiomycota, Funga, Gasteroides

PAGES: 75
BIG AREA: Ciências Biológicas
AREA: Botânica
SUMMARY:

Geastrum saccatum was described by Fries in 1829 and represents the first record of the genus for Brazil. The description proposed by Fries is succinct, making it difficult to understand the definition of the species. The characteristics and illustrations do not allow G. saccatum to be identified in a way that is critical for the accuracy of the taxon name. Fries did not indicate the type at the time of publication and did not indicate where the specimen was deposited. Currently, G. saccatum is considered the second most recorded species of the genus in Brazil, according to Brazilian databases. Due to its proximity to G. lageniforme and G. triplex, G. saccatum is commonly confused and mistakenly deposited in Brazilian herbaria. Thus, the objective of this work was to verify and circumscribe the species G. saccatum using Brazilian materials. A loan of exsiccates identified as G. saccatum was requested from Brazilian herbarium collections: JPB, UFRN-Fungos, URM, ICN and RB-Jabot. The specimens were analyzed macro and microscopically at the Laboratório de Sistemática de Fungos at UFBA. The procedures for molecular analysis were carried out at the Laboratório de Genética e Evolução Vegetal at UFBA. Primers ITS5/ITS4 and ITS1/ITS4, and LR0R/LR5r were used. The analysis of the responses obtained was carried out using specific software to generate phylogenetic trees. Phylogenetic analysis was performed with concatenated data in CIPRES and MrBayes, with Maximum Likelihood Analysis (ML) and Bayesian Analysis, respectively. 168 exsiccates identified as G. saccatum were not proven (Appendix 2). Of these, it was possible to obtain 30 sequences from the ITS region and 46 from the LSU, including contaminations. From morphological and phylogenetic analyses, some materials were identified as G. triplex, others it was not possible to identify the specific level due to the conditions of the material, and some it was only possible to confirm that they were not G. saccatum due to the morphological characteristics presented. Four new species of Geastrum have been proposed within Section Corollina, in addition to a lectotypification and epityfication being proposed for Geasturm saccatum. From these analyses, it is necessary to generate new data, including other primers, to confirm the identification of specimens within the G. saccatum complex, as well as to understand the subsections within the Corollina section.

COMMITTEE MEMBERS:
Interna - 1646424 - BIANCA DENISE BARBOSA DA SILVA
Externo à Instituição - RENATO JUCIANO FERREIRA
Externo à Instituição - RHUDSON HENRIQUE SANTOS FERREIRA DA CRUZ