Época, local de colheita e armazenamento na qualidade fisiológica da semente de sempre-viva (Syngonanthus elegans (Bong.) Ruhland - Eriocaulaceae)

Nunes, Silvia Cristina Paslauski; Nunes, Ubirajara Russi; Fonseca, Patrícia Gomes; Grazziotti, Paulo Henrique; Pêgo, Rogério Gomes; Marra, Leandro Marciano

doi:10.1590/s0101-31222008000100005

Cited by 9 publications

(8 citation statements)

References 7 publications

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“…Normalmente, plantas nativas apresentam baixas percentagens de germinação, quando comparadas com espécies melhoradas, mas, quando se trata de sementes ortodoxas, muitas vezes a germinação é alta, mesmo após longos períodos de armazenamento (Rojas-Aréchiga & Vázquez-Yanes, 2000; Nunes et al, 2008;Olvera-Carrilho et al, 2009).…”

Section: Resultsunclassified

Germinação in vitro e desenvolvimento pós-seminal de plântulas de Pilosocereus aurisetus (Werderm.) Byles & G.D. Rowley (Cactaceae)

et al. 2012

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In vitro germination and post-seminal development of plantlets of Pilosocereus aurisetus (Werderm.) Byles & G.D. Rowley (Cactaceae)Pilosocereus aurisetus is a species of cactus of economic and environmental importance, but the predatory exploitation led the species to be listed as threatened with extinction. P. aurisetus propagation occurs mainly in natural environment by sexual reproduction, though there is no record of germination, viability and morphology of postseminal seeds of this species. Thus, the objective of this study was to evaluate the germination and describe the morphology of post-seminal development of seeds of P. aurisetus. For this purpose, seeds stored at ambient conditions for 19 months were treated as follows: soaking in water for 24 hours, pre-cooling, soaking in solution of gibberellin in concentrations of 250 mg L -1 and 500 mg L -1 and a control. The seeds were germinated on MS medium for 30 days, whenRecebido para publicação em

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Section: Resultsunclassified

Germinação in vitro e desenvolvimento pós-seminal de plântulas de Pilosocereus aurisetus (Werderm.) Byles & G.D. Rowley (Cactaceae)

et al. 2012

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“…Paixão-Santos et al (2003) found that the germination of S. mucugensis was possible only in a culture medium without the addition of salts, with the germination speed index being 22 after 30 days. When compar ed wi th th e tr adi ti on al pa per subst ra te techniques presented by Oliveira and Garcia (2005) and Nunes et al (2008a), the micropropagation technique utilized in our study was more effective to increase the germination speed index of Syngonanthus sp.…”

Section: Resultsmentioning

confidence: 53%

“…Traditional tests using paper as a substrate found that S. elegantulus seeds reached a maximum germination of only 36.5% (OLIVEIRA; GARCIA, 2005). Working with S. elegans, Nunes et al (2008a) obtained 35% germination using seeds of the highest physiological quality.…”

Section: Resultsmentioning

confidence: 99%

“…In the rupestrian area of Serra do Espinhaço, Minas Gerais State, approximately 379 native species of the Eriocaulaceae family are found, with approximately 18% belonging to Syngonanthus (NUNES et al 2008a;COSTA;TROVÓ;SANO, 2008). Syngonanthus elegantulus Ruhland is one of the most exploited native species for ornamental purposes because the plants produce long flower stems with a small terminal capitulum composed of white bracts (COSTA; TROVÓ; SANO, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Micropropagation of Syngonanthus elegantulus

Pêgo

Paiva

2013

Ciênc. agrotec.

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The species Syngonanthus elegantulus Ruhland is an important native plant used as cut flowers, but extractive exploration has caused the endangered status of this plant. Therefore, the objective of this study was to establish a protocol of the micropropagation of S. elegantulus. To this end, seed germination was tested in media containing different concentrations of WPM salts. For plantlet establishment, MS and WPM media were evaluated with 50 and 100% of the salt concentrations. Different the sucrose levels in the WPM medium were also evaluated. For multiplication, the plantlets were inoculated in WPM media with 0.0, 0.5, 1.0, 2.0 and 4.0 mg L -1 TDZ and 0.0, 0.5 and 1.0 mg L -1 NAA in all possible combinations. The pre-acclimatization effect was tested in the plantlets using the following substrates: sand, Plantmax TM and vermiculite. The concentration of the medium did not influence the percentage of germination, but the germination speed index was inversely proportional to the nutrient addition to the culture medium. The best medium for plantlet establishment was WPM at the original salt concentration plus 17 g L -1 sucrose. The addition of 0.5 and 1.0 mg L -1 NAA is recommended for callus induction. The highest number of shoots was obtained in the presence of 1.0 mg L -1 TDZ or the combination of 1.0 mg L -1 TDZ with 0.5 mg L -1 NAA. S. elegantulus presented higher survival when acclimatized directly in sand. Index terms:In vitro cultivation, floriculture, conservation, endangered, plant. RESUMOA espécie Syngonanthus elegantulus Ruhland é uma importante planta nativa usada como flor de corte, mas sua exploração extrativista tem causado risco de extinção. Assim, neste estudo, objetivou-se estabelecer um protocolo de micropropagação de S. elegantulus. Para isso, a germinação das sementes foi testada em meio WPM, contendo diferentes concentrações de sais. Para o estabelecimento de plântulas, os meios MS e WPM foram avaliados com 50% e 100% de concentração de sais. Termos para indexação: Cultivo in vitro, floricultura, conservação, planta em extinção.

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“…These properties contribute to star flowers being harvested and exported for ornamental purposes (Giulietti et al, 1996;Nunes et al, 2008). Syngonanthus elegans (Bong.)…”

Section: Introductionmentioning

confidence: 99%

Species richness and root colonization of arbuscular mycorrhizal fungi in Syngonanthus elegans, an endemic and threatened species from the Cerrado domain in Brazil

et al. 2016

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Syngonanthus elegans is an endangered plant species occurring in the Brazilian Cerrado whose interaction with arbuscular mycorrhizal fungi (AMF) is poorly understood. The aim of this work was to evaluate the occurrence of AMF species and mycorrhizal colonization of S. elegans in two sampling areas named "Soberbo" stream (Soberbo) and "Parque Nacional das Sempre-Vivas" (Park), both found in Diamantina-MG, Brazil. In each area, one plot (100 x 100 m) was established, and roots and soil samples near the roots were collected from 10 plants in each plot. Further sampling included three specimens each of Loudetiopsis chrysothrix and Xyris sp.. Typical mycorrhizal colonization structures were observed in S. elegans roots, and colonization was measured at 75%. Considering both sites and all three hosts, 26 AMF species were recovered, 8 of which were identified only at the genus level. Glomus sp. 1, Scutellospora pernambucana, Acaulospora cavernata and Acaulospora mellea were classified as dominant in both areas. Other species were also considered dominant, including Glomus sp. 4 in Soberbo and Dentiscutata biornata and Gigaspora albida in Park. Trap cultures revealed the presence of seven additional species. For S. elegans, AMF species richness was slightly higher in Park than in Soberbo. Simpson diversity and evenness were slightly higher in Soberbo for S. elegans-associated AMF communities. Overall, S. elegans is highly colonized by arbuscular mycorrhizal fungi and is associated with a wide range of AMF species in the field, suggesting that this association is important for the establishment and survival of this threatened species. Some of the observed species may be new to science.Index terms: Fungal diversity; star flowers; Rupestrian fields. RESUMOSyngonanthus elegans é uma espécie vegetal em vias de extinção que ocorrem no Cerrado brasileiro, cuja interação com fungos micorrízicos arbusculares (FMA) é deficientemente compreendida. O objetivo deste trabalho foi avaliar a ocorrência de espécies de FMA e colonização micorrízica de S. elegans. Em duas áreas de amostragem denominadas Córrego do Soberbo (Soberbo) e Parque Nacional das Sempre-Vivas (Parque), ambas localizadas em Diamantina-MG, Brasil, uma parcela de 100 x 100 m foi estabelecida e solo da rizosfera e raízes foram coletados de 10 plantas em cada parcela. Além disso, amostragem incluiu três espécimes de cada Loudetiopsis chrysothrix e Xyris sp.. Estruturas típicas de colonização micorrízica foram observadas nas raízes de S. elegans e a colonização medida foi de 75%. Considerando as duas áreas e os três hospedeiros, 26 espécies de FMA foram recuperados, 8 delas identificadas apenas até gênero. Glomus sp. 1, Scutellospora pernambucana, Acaulospora cavernata e Acaulospora mellea foram classificados como dominantes em ambas as áreas. Além dessas, também foram consideradas dominantes Glomus sp. 4 em Soberbo, e Dentiscutata biornata e Gigaspora albida no Parque. Culturas armadilhas revelaram a presença de sete espécies adicionais. Para S. elegans, a rique...

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Época, local de colheita e armazenamento na qualidade fisiológica da semente de sempre-viva (Syngonanthus elegans (Bong.) Ruhland - Eriocaulaceae)

Cited by 9 publications

References 7 publications

Germinação in vitro e desenvolvimento pós-seminal de plântulas de Pilosocereus aurisetus (Werderm.) Byles & G.D. Rowley (Cactaceae)

Germinação in vitro e desenvolvimento pós-seminal de plântulas de Pilosocereus aurisetus (Werderm.) Byles & G.D. Rowley (Cactaceae)

Micropropagation of Syngonanthus elegantulus

Species richness and root colonization of arbuscular mycorrhizal fungi in Syngonanthus elegans, an endemic and threatened species from the Cerrado domain in Brazil

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