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Some of the Dyckia walteriana populations identified in the Serra Geral formation, Paraná state, Brazil. A = population 1 (before the intentional fire); B = population 2; C = population 8; D = population 10.
Source publication
Dyckia walteriana is a recently described rupicolous bromeliad, whose only officially known population is located on a basaltic outcrop in the Serra Geral formation, north of Paraná state, Brazil. Unfortunately, the population of the type locality was dramatically reduced in 2018 by an intentional fire. The main objectives of this work were to know...
Context in source publication
Context 1
... means of expeditions to each of the 40 sites, it was possible to verify, by visual estimation, the presence of D. walteriana populations in 12 of them, comprising hilltops or rocky walls next to a waterfall; with areas varying between 2.515 and 235.849 m 2 ; elevations between 572 and 719 m (Google Earth Pro, Google LLC 2018); exclusively basaltic rock matrices (Mineropar 2006); terrain slope between 0° and 90°, Cfa/Cwa or Cfa/Cfb climate; average annual temperature between 19.1 and 21 °C; pluviosity between 1500 and 1700 mm; average annual relative humidity between 68% and 74% ( Wrege et al. 2011); and SSF and SSF/MOF surrounding the rocky outcrop (Torezan 2002) (Table 3, Figures 1, 2, 3, 4 Torezan (2002). 5 Rapid Ecological Assessment (RAPPAM). ...
Similar publications
Dyckia walteriana is a recently described rupicolous bromeliad, whose only officially known population is located on a basaltic outcrop in the Serra Geral formation, north of Paraná state, Brazil. Unfortunately, the population of the type locality was dramatically reduced in 2018 by an intentional fire. The main objectives of this work were to know...
Citations
... Among the Dyckia species, for example, D. walteriana Leme. falls into the 'critically endangered' category, requiring urgent measures for the conservation of populations (Musegante et al., 2020;Reflora, 2023). ...
Brazil is home to a great diversity of species of the genus Dyckia. However, many of these species are threatened due to habitat destruction and predatory exploitation. An alternative to conserving these plants is sexual propagation using plant regulators to stimulate germination. Gibberellic acid (GA 3 ) is an effective regulator in this process, but its instability and ease of degradation pose challenges. Therefore, nanoencapsulation of GA 3 could be used to protect the molecule and allow controlled release. In this study, the effects of different doses of GA 3 were evaluated on the germination of four species: D. cabrerae, D. dusenii, D. pottiorum and D. walteriana. The first stage consisted of soaking the seeds in different concentrations of GA 3 , in which the species D. dusenii and D. walteriana showed significant responses to GA 3 , with an increase from 35% to more than 60% germination. However, the species D. cabrerae and D. pottiorum responded positively to GA 3 only in vegetative growth parameters. In the second stage, the use of nanoparticles of alginate/chitosan (NP ALG/CS) and chitosan/tripolyphosphate (NP CS/TPP) containing GA 3 was compared with free GA 3 and with NPs without GA 3 . It was verified that the use of nanoencapsulated GA 3 resulted in a more efficient germination response in D. walteriana seeds, using smaller doses of the regulator (between 0.75 mg · L ⁻¹ and 1.0 mg · L ⁻¹ ), mainly with the ALG/ CS NPs. Therefore, the use of GA 3 is recommended for D. dusenii and D. walteriana , and for the latter, nanoparticles containing ALG/CS-GA 3 allow a reduction in the required dose.
