Morphology of the pericarp and seed of Tabebuia chrysotricha (Mart. ex DC.) Standl. (Bignoniaceae)

Souza, Luiz Antônio de; Iwazaki, Maísa Carvalho; Moscheta, Ismar Sebastião

doi:10.1590/s1516-89132005000300012

Cited by 14 publications

(22 citation statements)

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“…As sementes maduras de Bignoniaceae foram descritas por Cronquist (1981) como tendo o endosperma ausente ou presente e a maioria dos trabalhos na família a descrevem como tendo ausência de endosperma ou endosperma limitado (Hyakutake & Grotta 1965, Panizza 1967, Corner 1976, Beltrati & Piccolo 1979, Mehra & Kulkarni 1985, Gabrielli & Castro 1995, Costa 1995, Ferreira & Cunha 2000, Souza et al 2005, como observado em Tabebuia ochracea. Devido à presença deste endosperma limitado, os termos semente albuminosa e exalbuminosa são utilizados indistintamente, de forma que um consenso para a descrição do endosperma nas sementes maduras de Bignoniaceae é de grande importância taxonômica.…”

Section: Discussionunclassified

“…Provavelmente, a degeneração das células parenquimáticas da mesotesta em T. ochracea, também observada em T. chrysotricha (Souza et al 2005), é provocada por enzimas secretadas pelas células endoteliais, sendo essas impedidas de atuar sobre o endosperma e o embrião devido à espessa cutícula presente nas paredes periclinais internas do endotélio (Kapil & Tiwari 1978, Werker 1997. Essa cutícula ainda impede que os nutrientes presentes no endosperma se desloquem para a mesotesta e permite uma distinção entre as porções endospérmica e endotelial do envoltório membranáceo.…”

Section: Discussionunclassified

“…f., Stereospermum chelonoides DC. ; o de Shivaramiah (1998) Souza et al (2005) com T. chrysotricha. O tipo Catalpa com pequenas variações parece ser o representativo para Tabebuia.…”

unclassified

“…Apesar de o gênero Tabebuia ser formado por aproximadamente 100 espécies (Gentry 1992), foram realizadas investigações sobre ontogenia da semente apenas em T. rosea (Mehra & Kulkarni 1985), Tabebuia pulcherrima Sandwith (Bittencourt Júnior & Mariath 2002), T. serratifolia (Costa 1995), T. pallida (Shivaramiah 1998), T. impetiginosa (Bittencourt Júnior & Semir 2005) e T. chrysotricha (Souza et al 2005). Tabebuia ochracea (Cham.)…”

unclassified

“…Assim, o estudo da ontogenia da semente em T. ochracea, justifica-se pela escassez de estudos sobre ontogenia da semente no gênero, pela importância ecológica e econômica da espécie e, também, por viabilizar comparações com T. chrysotricha, espécie considerada taxonomicamente próxima de T. ochracea (Gentry 1992). T. chrysotricha e T. ochracea ainda representam exceções na família, por apresentarem apomixia e sementes poliembriônicas (Costa et al 2004, Souza et al 2005.…”

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Ontogenia da semente de Tabebuia ochracea (Cham.) Standl. (Bignoniaceae)

2007

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-(Seed ontogeny in Tabebuia ochracea (Cham.) Standl. (Bignoniaceae)). The present work describes seed ontogeny in T. ochracea through histological analysis with special reference to the endospermogenesis. The ovule is anatropous, unitegmic and tenuinucelate; hypostase, nutrient passage route and endothelium are present. The endosperm is cellular with posterior development of Catalpa type. The chalazal haustorium of endosperm is primary, bicellular and it is totally degenerated during seed maturity; on the contrary the micropylar one is secondary, multicellular, differentiates latter, and remains active until the seed maturity. A latter differentiated endosperm was observed forming, together with the endothelium, a membranaceous envelope of the embryos. The endospermogenesis are in accord with previous results from other species of Tabebuia. Furthermore, the micropylar haustorium diferentiation and the membranaceous envelope origin were elucidated, the latter probably is the same in other species that present this structure.Key words -Bignoniaceae, endosperm, ontogeny, seed, Tabebuia ochracea RESUMO -(Ontogenia da semente de Tabebuia ochracea (Cham.) Standl. (Bignoniaceae)). O presente trabalho descreveu a ontogenia da semente de T. ochracea através de análises histológicas com especial referência a endospermogênese. Os óvulos são anátropos unitegumentados e tenuinucelados; hipóstase, rota de passagem de nutrientes e endotélio estão presentes. O endosperma é celular com desenvolvimento posterior do tipo Catalpa. O haustório calazal do endosperma é primário, bicelular e apresenta-se totalmente degenerado durante a maturidade da semente; já o micropilar é secundário, multicelular, diferencia-se tardiamente e está ativo até a maturidade da semente. Foi observado um endosperma diferenciado tardiamente formando, juntamente com o endotélio, um envoltório membranáceo dos embriões. A endospermogênese corresponde ao encontrado para outras espécies do gênero. Além disso, a diferenciação do haustório micropilar e a origem do envoltório membranáceo são elucidadas e, a última, provavelmente é a mesma nas espécies que apresentam essa estrutura.

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Section: Discussionunclassified

“…f., Stereospermum chelonoides DC. ; o de Shivaramiah (1998) Souza et al (2005) com T. chrysotricha. O tipo Catalpa com pequenas variações parece ser o representativo para Tabebuia.…”

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Ontogenia da semente de Tabebuia ochracea (Cham.) Standl. (Bignoniaceae)

2007

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Using phenology to assess urban heat islands in tropical and temperate regions

Jochner

Alves‐Eigenheer

Menzel

et al. 2013

Intl Journal of Climatology

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ABSTRACT:The study of urban phenology is relevant to assess the effects of heat islands and the potential impacts of climate change on plants. Temperature is the main factor regulating plant development in moist/temperate regions. However, plants in tropical cities may respond to additional environmental cues, such as air humidity. We examined whether differences in air temperature and humidity along an urban-rural gradient influenced phenological onset dates of trees in a temperate mid-latitude city (Munich, Germany) and a city in the neotropics (Campinas, Brazil). (Dis)similarities were identified incorporating equivalent study design based on identical methods for recording phenology and site-specific meteorological data. We found that phenological onset dates of silver birch (Betula pendula) were able to describe local temperature variations in Munich. Correlation coefficients between mean temperature and onset dates of Betula were significant and varied between r = −0.48 and r = −0.72. However, onset dates for yellow trumpet tree (Tabebuia chrysotricha), false Brazilwood (Caesalpinia pluviosa) and rosewood (Tipuana tipu) in Campinas were rather variable, and the magnitude and significance of correlation coefficients with temperature varied greatly among species/phenophases. Nevertheless, we detected significant correlations, especially between Tipuana phenophases and temperature and between leaf unfolding of Tabebuia and humidity. Our findings revealed that the phenology of Tipuana was sufficiently sensitive to detect urban heat island effects in Campinas and might be a useful indicator of temperature variations and, in turn, of global warming. Because Tipuana is widely used for urban arborization in South America, we foresee many applications for monitoring heat islands in the neotropics. Furthermore, the fact that most phenophases of Tabebuia were not responsive to temperature stressed the importance of humidity variables. Additional species and phenophases should be explored to identify the further potential of phenology for monitoring heat islands in tropical cities.

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Polyploidy and polyembryony in Anemopaegma (Bignonieae, Bignoniaceae)

et al. 2013

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Polyploidy is a key process in plant evolution, with the asexual formation of embryos representing a way through which polyploids can escape sterility. The association between polyploidy and polyembryony is known to occur in Bignoniaceae. In this study, we investigate polyembryony in four polyploid species of Anemopaegma: A. acutifolium, A. arvense, A. glaucum and A. scabriusculum as well as in one diploid species, A. album. Polyembryony was observed only in polyploid species. We used seed dissection and germination tests to compare the number of polyembryonic seeds. We tested how the pollen source influences the number of polyembryonic seeds and the number of embryos per seed and tested the correlation between the number of viable seeds per fruit and mean number of embryos per seed. The number of polyembryonic seeds observed by seed dissection was higher than the number of polyembryonic seeds determined by the germination test, with the number of embryos produced per seed being higher than the number of seedlings. The dissection of seeds of A. glaucum indicated that a higher number of polyembryonic seeds and a higher number of embryos were present in seeds from cross-pollination than in seeds from self-pollination. On the other hand, germination tests indicated that a higher number of polyembryonic seeds were present in fruits from self-pollination than from cross-pollination. The mean number of embryos per seed was not influenced by the number of viable seeds per fruit in fruits from open pollination. These results indicate a positive relationship between polyembryony and polyploidy in Anemopaegma.

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Morphology of the pericarp and seed of Tabebuia chrysotricha (Mart. ex DC.) Standl. (Bignoniaceae)

Abstract: ABSTRACT

Cited by 14 publications

References 4 publications

Ontogenia da semente de Tabebuia ochracea (Cham.) Standl. (Bignoniaceae)

Ontogenia da semente de Tabebuia ochracea (Cham.) Standl. (Bignoniaceae)

Using phenology to assess urban heat islands in tropical and temperate regions

Polyploidy and polyembryony in Anemopaegma (Bignonieae, Bignoniaceae)

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