&lt;em&gt;Melocactus violaceus&lt;/em&gt; Pfeiff. (Cactaceae) growth rate and abundance in a sandy terrace of Atlantic Rain Forest (REBIO Guaribas, Paraíba, Brazil)

Lafite, Niviane Ferreira; Salimon, Cleber Ibraim

doi:10.29215/pecen.v4i0.1515

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…Melocactus present in its apex a peculiar structure to the genus called cephalium, which occurs only when the cactus reaches reproductive maturity, at approximately ten years of age, mainly due to very slow vegetative growth (0.04-4.7 cm per year) (Lafite and Salimon, 2020). The natural reproduction is exclusively by seeds due to limited vegetative propagation since they do not develop segmentations as observed in other cactus species (Bravo Filho et al 2018a).…”

Section: Introductionmentioning

confidence: 99%

Light and ethephon overcoming seed dormancy in Melocactus zehntneri

Cardoso

Magnani

2023

Preprint

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Seed germination in Melocactus and other cactus species is hampered by the occurrence of dormancy. However, most studies failed to achieve high seed germination rates, suggesting a complex mechanism of dormancy in Cactaceae. Thus, the objective of this study was to demonstrate that dormancy in Melocactus seeds may be associated with factors such as light and phytoregulators. Two consecutive experimental sets were designed: one with seed germination paper under different wavelengths and Photosynthetically Photon Flux Densities (PPFDs); and one in vitro experiment using a culture medium to evaluate the influence of different plant growth regulators, both in the germination of seeds of Melocactus zehntneri. The results obtained showed that seeds of M. zehntneri are positive photoblastic. Red light and gradual increases in PPFD resulted in the highest germination rates and speed germination index. The experiment with phytoregulators showed a major effect of Ethephon to release the germination of dormant seeds of M. zenhtneri, totalizing 98% of seeds germinated under in vitro conditions, compared to 76% in control. The present study develops an efficient technique to break seed dormancy and the results can be useful to better understand cacti seed dormancy.

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Section: Introductionmentioning

confidence: 99%

Light and ethephon overcoming seed dormancy in Melocactus zehntneri

Cardoso

Magnani

2023

Preprint

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“…Melocactus displays a distinctive feature unique to the genus known as a cephalium at its apex. This characteristic occurs only when the cactus reaches reproductive maturity at approximately 10 years of age, mainly due to very slow vegetative growth (0.04–4.7 cm per year) [ 11 ]. The natural reproduction is exclusively by seeds due to limited vegetative propagation since they do not develop segmentations as observed in other cactus species [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Light and Ethephon Overcoming Seed Dormancy in Friar’s Crown (Melocactus zehntneri, Cactaceae), a Brazilian Cactus

Magnani,

Cardoso

2023

Plants

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Seed germination in Melocactus and other cactus species is hampered by dormancy. However, most studies failed to achieve high seed-germination rates, suggesting a complex mechanism of dormancy in Cactaceae. Thus, the objective of this study was to evaluate whether factors such as light and phytoregulators overcome the dormancy in the seeds of the friar’s crown cactus (Melocactus zehntneri). Two consecutive experimental sets were designed: one with seed germination under filter paper conditions and different wavelengths and Photosynthetically Photon Flux Densities (PPFDs); and one in vitro experiment using a culture medium to evaluate the influence of different phytoregulators, such as gibberellic acid (GA3), benzylaminopurine (BAP) and ethephon (ET), both in the germination of seeds of M. zehntneri. Seeds of M. zehntneri are positive photoblastic. Red light and gradual increases in PPFD resulted in the highest germination rates (60.8–61.7%) and germination speed index (4.4–4.5). In vitro seeding in culture media increased the germination percentage to 76% in control without phytoregulators. Ethephon showed a major effect in releasing the germination of dormant seeds of M. zehntneri, totaling 98% of seeds germinated under in vitro conditions, while GA3 and BAP showed minor or no effect on germination. The present study resulted in an efficient in vitro technique for germination and a better understanding of cacti seed dormancy.

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Data analysis of Melocactus (Cactaceae) virtual herbarium in the Caatinga biome: a synthesis of reproduction and geographical distribution

Vieira,

Silva Neto,

Quirino

2024

Rev. Caatinga

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The objective of this study was to analyze data of the genus Melocactus (Cactaceae) in the Caatinga biome using a virtual herbarium, determine its reproductive aspects, and establish its geographical distribution. Data were collected from the SpeciesLink platform. Notes on exsiccata labels were analyzed to assess reproductive characteristics. Coordinate information was used to develop a distribution map for the genus in the Caatinga biome. A total of 469 records were found in 35 herbaria in Brazil. Melocactus zehntneri stood out with 208 records, followed by M. ernestii, and M. bahiensis. The data were concentrated in a few herbaria, mainly in the Herbarium of the State University of Feira de Santana, which had 28% of the records. Collections were carried out in June (63 records) and in July (59 records). Regarding the reproductive period, Melocactus was active throughout the year, but more concentrated from June to October. The genus is composed of species that depend on animal pollination and dispersal, according to coloration and visitation data. Melocactus is widely distributed throughout the Caatinga, with a tendency to concentrated in drier areas of the biome, in the states of Bahia, Pernambuco, and Paraiba. Herbaria are valuable tools for ecological investigations; therefore, promoting the digitalization of collections and improving the quality and quantity of annotations on specimens are necessary. The genus Melocactus has several characteristics that make it an essential group for maintaining biodiversity in the Caatinga biome.

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<em>Melocactus violaceus</em> Pfeiff. (Cactaceae) growth rate and abundance in a sandy terrace of Atlantic Rain Forest (REBIO Guaribas, Paraíba, Brazil)

Cited by 3 publications

References 9 publications

Light and ethephon overcoming seed dormancy in Melocactus zehntneri

Light and ethephon overcoming seed dormancy in Melocactus zehntneri

Light and Ethephon Overcoming Seed Dormancy in Friar’s Crown (Melocactus zehntneri, Cactaceae), a Brazilian Cactus

Data analysis of Melocactus (Cactaceae) virtual herbarium in the Caatinga biome: a synthesis of reproduction and geographical distribution

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