Contrasting breeding systems in twoEriotheca (Bombacaceae) species of the Brazilian cerrados

Oliveira, Paulo Eugênio; Gibbs, Peter; Barbosa, Ana Angélica Almeida; Lozano, Salvador Talavera

doi:10.1007/bf00937597

Cited by 80 publications

(102 citation statements)

References 34 publications

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“…This result is new to Bignoniaceae, because the neopolyploid species of Anemopaegma and Handroanthus studied to date are clearly self-compatible (Bittencourt & Semir 2005;Bittencourt & Moraes 2010;Firetti-Leggieri et al 2013;Sampaio et al 2013a). As these neopolyploid and self-compatible species also present polyembryony caused by sporophytic apomixis (Costa et al 2004;Bittencourt & Moraes 2010;Sampaio et al 2013b), it is possible that the self-fertility observed was trigged by the development of adventive embryos, as previously hypothesized (Oliveira et al 1992;Bittencourt & Semir 2005;Bittencourt & Moraes 2010;Sampaio et al 2013a). Our data suggests that neopolyploidy does not seem to be the main factor causing self-fertility in Handroanthus species.…”

Section: Discussionsupporting

confidence: 55%

“…Although neopolyploidy seems to be effectively associated with the breakdown of self-incompatibility systems, especially the gametophytic system (de Nettancourt 1977;Richards 1986;Levin 2002;Pannell et al 2004;Barringer 2007), some studies suggest that the self-fertility found in these pseudogamic apomictic sporophytic species is not determined exclusively by neopolyploidy (Oliveira et al 1992;Bittencourt & Semir 2005;Bittencourt & Moraes 2010;Sampaio et al 2013a). The LSI found in most species of Bignoniaceae allows pollen tube growth, ovule penetration, fertilization and endosperm development prior to self-pollinated pistil abscission (Bittencourt et al 2003;Bittencourt & Semir 2005;Gandolphi & Bittencourt 2010).…”

Section: Introductionmentioning

confidence: 99%

“…In apomictic species, adventitious embryos develop irrespective of pollination but are able to reach maturity only when the endosperm is available (Bittencourt & Moraes 2010;Sampaio et al 2013b). Therefore, the presence of adventitious embryos in self-fertilized ovules with endosperm development, which is common in LSI species, could trigger the fruit-set of self-pollinated pistils (Oliveira et al 1992;Bittencourt & Moraes 2010;Sampaio et al 2013a).…”

Section: Introductionmentioning

confidence: 99%

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Self-sterility in the hexaploid Handroanthus serratifolius (Bignoniaceae), the national flower of Brazil

et al. 2013

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Polyploidization is common among angiosperms and might induce typically allogamous plants to become autogamous (self-compatible, relying on sexual self-fertilization) or apomictic (achieving asexual reproduction through seeds). This work aimed to determine whether neopolyploidy leads to the breakdown of the self-incompatibility system in the hexaploid non-apomictic species Handroanthus serratifolius (Vahl) S. Grose, through analyses of its floral biology, pollination biology and breeding system. Although anthesis lasted for three days, increasing the overall floral display, receptivity decreased as of the second day. Centridini and Euglossini bees were the main pollinators, and low nectar availability (1.95 ± 1.91 μl/flower) might have obliged them to visit multiple flowers. We observed low reproductive efficacy. That might be explained by self-sterility and by the great number of flowers per individual, which could increase the frequency of geitonogamy. Ovule penetration by the pollen tubes in self-pollinated pistils with posterior abscission indicated late-acting self-incompatibility in H. serratifolius, as observed in other diploid Bignoniaceae species, although inbreeding depression cannot be excluded. The self-sterility found in the monoembryonic, hexaploid individuals studied here contrasts with the results for other neopolyploid Handroanthus and Anemopaegma species, which are often autogamous and apomictic. Our results suggest that neopolyploidy is not the main factor leading to self-fertility in Handroanthus.Key words: apomixis, late-acting self-incompatibility, monoembryony, polyploidy, Tabebuia serratifolia Acta Botanica Brasilica 27(4): 714-722. 2013. Self-sterility in the hexaploid Handroanthus serratifolius(Bignoniaceae), the national flower of Brazil

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Section: Discussionsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Self-sterility in the hexaploid Handroanthus serratifolius (Bignoniaceae), the national flower of Brazil

et al. 2013

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“…This phenomenon was registered by Seavey & Bawa (1986) in many tropical trees including Dipterix alata, which is a native cerrado tree. Since then it has been observed other Brazilian cerrado species, as Eriotheca gracilipes (Oliveira et al 1992), Jacaranda caroba (Vieira et al 1992), Chorisia chodattii, C. speciosa, Tabebuia (Gibbs & Bianchi 1993), and Siphoneugena densiflora, Blepharocalyx salicifolius and Campomanesia velutina (Proença & Gibbs 1994). The late-acting self-incompatibility as observed in T. aurea and T. ochracea, seems to be a good strategy for the maternal parent selects best donors, as they had only one month of mass-flowering blooming, which may attract a great amount of pollinators.…”

Section: Resultsmentioning

confidence: 99%

Pollination ecology of Tabebuia aurea (Manso) Benth. & Hook. and T. ochracea (Cham.) Standl. (Bignoniaceae) in Central Brazil cerrado vegetation

Barros¹

2001

Rev. bras. Bot.

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-(Pollination ecology of Tabebuia aurea (Manso) Benth. & Hook. and T. ochracea (Cham.) Standl. in Central Brazil cerrado vegetation). The pollination ecology and breeding systems of Tabebuia aurea (Manso) Benth. & Hook., and T. ochracea (Cham.) Standl. were investigated in an area of cerrado vegetation in the Federal District of Brazil. These species occur sympatrically, flower massively and synchronously for a month, during the dry season (July to September). Both have diurnal anthesis, with similar floral structures, a yellow tubular corolla and produce nectar. Fourteen species of bees visited both Tabebuia species, but, only three Centris species and Bombus morio, were considered potential pollinators, because of their high frequency on the flowers and their efficiency in carrying pollen. Tests on the breeding systems of T. aurea and T. ochracea demonstrated that boths species are self-incompatible, with late-acting self-incompatibility. The proportion of fruit set from cross pollination (T. aurea 17.2% and T. ochracea 12.3%) in both species was low considering the great number of flowers displayed. This suggests a lack of maternal resources for fruit-set. The great amount of seeds per fruit (about 92 in T. aurea and 285 in T. ochracea) may represent an investment of maternal resources allocated on higher quality of fertilized ovules. RESUMO -(Ecologia da polinização de

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“…Uma vez que a apomixia pode ser diretamente relacionada ao caráter poliplóide (Oliveira et al 1992, Richards 1997, Goldenberg & Shepherd 1998 e que já foi detectada a presença de poliembrionia concomitante ao caráter tetraplóide (2n = 80) em T. chrysotricha (Piazzano 1998), é possível que também ocorra poliploidia na espécie em estudo. T. chrysotricha e T. ochracea são as únicas espécies da família Bignoniaceae nas quais a poliembrionia já foi reportada, o que reforça sua conhecida proximidade taxonômica (Gentry 1992), além de corroborar a idéia de Goldenberg & Shepherd (1998), para a família Melastomataceae, de que a apomixia esteja mais relacionada à taxonomia e filogenia do que com o hábitat.…”

Section: Discussionunclassified

Poliembrionia e aspectos da embriogênese em Tabebuia ochracea (Chamisso) Standley (Bignoniaceae)

Costa¹,

Sampaio²,

Paoli³

et al. 2004

Rev. bras. Bot.

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-(Polyembryony and aspects of embryogenesis in Tabebuia ochracea (Chamisso) Standley (Bignoniaceae)). The origin of the extranumerary embryos and the embryogeny of Tabebuia ochracea were analysed. Extranumerary apomictic embryos are of adventitious origin from hypostase cells and from the integument of ovule micropilar region. The embryogeny corresponds to Onagrad type. Among 233 dissected seeds, 81.37% presented polyembryony and up to seven embryos were detected in a single seed. Sexual and adventitious embryos can develop together in a single seed. Some of the adventitious embryos show severe morphoanatomical anomalies that can affect their development into seedlings.Key words -apomixis, Bignoniaceae, polyembryony, Tabebuia ochracea RESUMO -(Poliembrionia e aspectos da embriogênese em Tabebuia ochracea (Chamisso) Standley (Bignoniaceae)). A origem dos embriões supranumerários e a embriogenia de Tabebuia ochracea foram analisadas. Embriões supranumerários apomíticos têm origem adventícia a partir de células da hipóstase e do tegumento da região micropilar do óvulo. A embriogenia corresponde ao tipo Onagrado. Das 233 sementes dissecadas 81,37% apresentaram poliembrionia e foram encontrados até sete embriões em uma mesma semente. Aparentemente, embriões sexuais e adventícios podem se desenvolver juntos, numa mesma semente. Alguns dos embriões adventícios apresentam alterações morfoanatômicas graves que podem prejudicar seu desenvolvimento em plântulas.

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Contrasting breeding systems in twoEriotheca (Bombacaceae) species of the Brazilian cerrados

Cited by 80 publications

References 34 publications

Self-sterility in the hexaploid Handroanthus serratifolius (Bignoniaceae), the national flower of Brazil

Self-sterility in the hexaploid Handroanthus serratifolius (Bignoniaceae), the national flower of Brazil

Pollination ecology of Tabebuia aurea (Manso) Benth. & Hook. and T. ochracea (Cham.) Standl. (Bignoniaceae) in Central Brazil cerrado vegetation

Poliembrionia e aspectos da embriogênese em Tabebuia ochracea (Chamisso) Standley (Bignoniaceae)

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