Terminal buds and successively subjacent lateral buds of the water fern, Marsilea drummondii, were examined to determine the pattern of hormone distribution in relation to apical dominance. Quantitative levels of indole-3-acetic acid (IAA), abscisic acid (ABA), zeatin and zeatin riboside (Z and ZR), and isopentenyladenosine (iPA) were determined by a solid-phase immunoassay using polycional ant...

Previous studies have shown that core leptosporangiates, the most species-rich group of extant ferns (monilophytes), have a distinct plastid genome (plastome) organization pattern from basal fern lineages. However, the details of genome structure transformation from ancestral ferns to core leptosporangiates remain unclear because of limited plastome data available. Here, we have determined the ...

Abstract The Seasonally Dry Tropical Forests and Woodlands biome (SDTFW) has its largest nucleus in the Caatinga domain. We characterized flora physiognomy of vegetation Pedra da Andorinha Wildlife Refuge (RPA), Ceará, Brazil. Plant collections were made between March/2015 May/2021, applying usual botanical methods. All material was deposited HUVA herbarium. phytosociological studies covered fi...

The effect of CN(-) and N(2) on the electrical membrane potential (E(m)) was compared with that of CN(-) on the ATP levels in cotyledons of Gossypium hirsutum and in Lemna gibba L. In mature cotton tissue, CN(-) depolarized E(m) to the energy-independent diffusion potential (E(D)) in the dark. In the light E(m) recovered transiently. The same was observed in leaves of Nicotiana, Avena, Impatien...

Many studies of nuclear genes encoding chloroplast proteins have focused on the transcriptional regulation of their expression. The genes (rbcS) encoding the small subunit (SSU) of ribulose-1,5-bisphosphate carboxylase/oxygenase, a major stromal protein, comprise one such group. We have examined the role played by post-transcriptional events in determining the relative levels of individual rbcS...