Sistemática, evolução e biologia reprodutiva de Utricularia com ênfase para Utricularia amethystina Salzm. Ex A.St.-Hil. & Girard (Lentibulariaceae)

Pós-graduação em Agronomia (Genética e Melhoramento de Plantas) - FCAV

Seed morphology of bladderworts: a survey on Utricularia sect. Foliosa and sect. Psyllosperma (Lentibulariaceae) with taxonomic implications

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Feeding ecology of a carnivorous bladderwort (Utricularia uliginosa, Lentibulariaceae)

The terrestrial carnivorous bladderwort, Utricularia uliginosa Vahl. (Lentibulariaceae) was studied to determine the species assemblage present in traps of these plants in situ across four sites over 15 months. The immediate soil environment was also sampled to determine the fauna present, and to compare the fauna present in traps with the fauna in the environment. The soil fauna consisted of 10 taxon types, which occupied either pelagic, epibenthic or interstitial microhabitats. All were found in traps of U. uliginosa, with the main prey being interstitial taxa followed by epibenthic and occasionally pelagic taxa. Numbers of individuals of the two most abundant soil taxa (nematodes, Elaphoidella) varied independently across the four sites over the 15 months of the study, as did numbers of Elaphoidella in the traps of U. uliginosa. Numbers of nematodes in the traps of U. uliginosa showed significant differences among sites, but not differences among times. Comparison of the trap fauna with the soil fauna revealed differences in relative abundance between soil samples and trap samples for two of the three taxa examined. There was an under-representation of nematodes in the traps relative to numbers in surrounding soil. There was an over-representation of the copepod Elaphoidella in the traps of U. uliginosa relative to numbers in soil at some of the times of sampling. Acarina were equally abundant in soil and trap samples. The patterns observed for Elaphoidella and nematodes may be due to selectivity in trapping by U. uliginosa, and/or differences in digestibility of the prey. Elaphoidella individuals were found to be attracted to U. uliginosa in a behavioural experiment. This may contribute to the over-representation of Elaphoidella in the traps of U. uliginosa in the field.

Genome-wide analysis of adaptive molecular evolution in the carnivorous plant Utricularia gibba

The genome of the bladderwort Utricularia gibba provides an unparalleled opportunity to uncover the adaptive landscape of an aquatic carnivorous plant with unique phenotypic features such as absence of roots, development of water-filled suction bladders, and a highly ramified branching pattern. Despite its tiny size, the U. gibba genome accommodates approximately as many genes as other plant genomes. To examine the relationship between the compactness of its genome and gene turnover, we compared the U. gibba genome with that of four other eudicot species, defining a total of 17,324 gene families (orthogroups). These families were further classified as either 1) lineage-specific expanded/contracted or 2) stable in size. The U. gibba-expanded families are generically related to three main phenotypic features: 1) trap physiology, 2) key plant morphogenetic/developmental pathways, and 3) response to environmental stimuli, including adaptations to life in aquatic environments. Further scans for signatures of protein functional specialization permitted identification of seven candidate genes with amino acid changes putatively fixed by positive Darwinian selection in the U. gibba lineage. The Arabidopsis orthologs of these genes (AXR, UMAMIT41, IGS, TAR2, SOL1, DEG9, and DEG10) are involved in diverse plant biological functions potentially relevant for U. gibba phenotypic diversification, including 1) auxin metabolism and signal transduction, 2) flowering induction and floral meristem transition, 3) root development, and 4) peptidases. Taken together, our results suggest numerous candidate genes and gene families as interesting targets for further experimental confirmation of their functional and adaptive roles in the U. gibba's unique lifestyle and highly specialized body plan.

A new species of Utricularia (Lentibulariaceae) from central Brazil

Utricularia cochleata C. P. Bove (Lentibulariaceae) from the "cerrado" (savanna) in central Brazil is described and illustrated. It is similar to Utricularia aureomaculata Steyerm. and Utricularia steyermarkii P. Taylor and can be distinguished from both by the densely branched traps, smaller lower calyx lobe, with rounded apex, the spur longer than the lower lip, insertion of the thecae below the filament apex, and the ciliate stigma.

Primary production of Utricularia foliosa L., Egeria densa Planchon and Cabomba furcata Schult & Schult.f from rivers of the coastal plain of the State of São Paulo, Brazil

Seasonal variation in gross primary production (GPP) of Utricularia foliosa Linnaeus, Egeria densa Planchon and Cabomba furcata Schult & Schult.f. in rivers of the coastal plain of the state of São Paulo, Brazil was examined in relation to water physico-chemistry. These three species do not affect the multiple uses of the streams and are present throughout the year. The most productive was U. foliosa (maximum production 24.7 mgO(2) g(-1) DW h(-1)), while C. furcata had an intermediate GPP (maximum production 17.5 mgO(2) g(-1) DW h(-1)) and E. densa was lowest at 5.6 mgO(2) g(-1) DW h(-1). Despite the low amplitude of seasonal variation in this south tropical area, the three species showed seasonal variation in the primary production: GPP was positively correlated with photosynthetic active radiation for U. foliosa and E. densa, and there was a negative correlation for C. furcata. For U. foliosa, GPP was positively correlated with temperature and dissolved inorganic carbon and the GPP of C. jurcata was positively correlated with dissolved inorganic carbon.

MICROSATELLITE MARKERS DEVELOPED FOR UTRICULARIA RENIFORMIS (LENTIBULARIACEAE)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Sistemática molecular de Utricularia L. (Lentibulariaceae)

Pós-graduação em Agronomia (Genética e Melhoramento de Plantas) - FCAV

Bacterial community associated with traps of the carnivorous plants Utricularia hydrocarpa and Genlisea filiformis

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Reproductive biology and pollination of Utricularia reniformis A.St.-Hil. (Lentibulariaceae)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Composição química da macrófita aquática Utricularia foliosa em um rio de águas brancas e um rio de águas pretas da bacia do rio Itanhaém, SP

Não disponível

DNA Barcoding em Utricularia (Lentibulariaceae)

Pós-graduação em Agronomia (Genética e Melhoramento de Plantas) - FCAV

MICROSATELLITE MARKERS DEVELOPED FOR UTRICULARIA RENIFORMIS (LENTIBULARIACEAE)

Premise of the study: Microsatellite markers were developed to study the genetic diversity and population structure of the carnivorous bladderwort Utricularia reniformis, which is endemic to the Atlantic Forest of southern and southeastern Brazil. Cross-species amplification was tested in U. gibba, U. neottioides, U. subulata, and Pinguicula benedicta. Methods and Results: The U. reniformis genome was sequenced in a 454 GS FLX sequencer, and eight primer sets were developed based on the microsatellites identified from the reads. All loci are polymorphic, showing 1.6 to 4.8 alleles per population. Preliminary results show that primer sets are suitable for population-level studies. Cross-species amplifi cation was successful in three other Utricularia species and one Pinguicula species. Conclusions: Markers developed in this study provide tools for analyses of intra- and interpopulation genetic diversity in Utricularia and Pinguicula.

Wasserschlauch - Utricularia vulgaris

AR

Beiträge zur kenntnis der keimung der winterknospen von Hydrocharis morsus ranae, Utricularia vulgaris und Myriophyllum verticillatum.

Thesis--Kiel University.