Sistema reprodutivo de Sparattosperma leucanthum (Vell.) K. Schum. (Bignoniaceae)

Polatto, Leandro Pereira; Júnior, Valter Vieira Alves

doi:10.1590/s0100-67622009000200010

Cited by 7 publications

(11 citation statements)

References 22 publications

(15 reference statements)

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“…However, because of the loyalty to the plant visited (Nagamitsu and Inoue 1997), it has been suggested that when these two species effect accidental pollination, it will usually occur via self-pollination or geitonogamy and, according to Polatto and Alves Júnior (2009), S. leucanthum requires cross-pollination for fruit production. Therefore, the presence of these bees foraging flowers of S. leucanthum would be advantageous only when the rate of effective pollinators visiting the flowers was extremely low (Polatto and Alves Jr. 2008).…”

Section: Discussionmentioning

confidence: 99%

“…This method assesses the fruit set rate from the pollen deposition efficiency in a single visit performed by a certain visitor to the virgin flowers and it is frequently used to evaluate the effectiveness of each pollinator and to identify non-pollinators. The low fruit set rate of S. leucanthum under natural conditions (only 1%), compared with hand cross-pollination, with a 35% fruit set rate (Polatto and Alves Júnior 2009), along with the high diversity of floral visitors (as reported below in "Results"), were the requisites that made it unfeasible to apply Spears experimental delineation (1983).…”

Section: Methodsmentioning

confidence: 99%

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Exploitation of floral resources on Sparattosperma leucanthum (Bignoniaceae): foraging activity of the pollinators and the nectar and pollen thieves

et al. 2011

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Exploitation of floral resources on Sparattosperma leucanthum (Bignoniaceae): foraging activity of the pollinators and the nectar and pollen thieves

et al. 2011

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“…Apesar da diversidade de espécies existente em Bignoniaceae -cerca de 827 espécies (Lohmann 2006) distribuídas em 82 gêneros (Olmstead et al 2009), das quais aproximadamente 620 são espécies neotropicais (Spangler & Olmstead 1999) -, investigações sobre os seus sistemas reprodutivos são relativamente escassas, tendo sido realizadas em pouco mais de 6% (51 espécies) da família (Gibbs & Bianchi 1999;Dutra & Machado 2001;Bittencourt et al 2003;Bittencourt & Semir 2004;2006;Correia et al 2005;2006;Carvalho et al 2007;Yanagizawa & Maiomni-Rodella 2007;Guimarães et al 2008;Maués et al 2008;Srithongchuay et al 2008;Polatto & Alves 2009;Sampaio 2010). Esses estudos indicaram que, com exceção de Pyrostegia venusta (Gobatto-Rodrigues & Stort 1992), Astianthus viminalis (Bullock 1985), Tecoma stans (Singh & Chauhan 1996;Dutra & Machado 2001), Handroanthus chrysotrichus (syn.…”

Section: Introductionunclassified

Sistema reprodutivo do Ipê-Branco: Tabebuia roseo-alba (Ridley) Sandwith (Bignoniaceae)

Gandolphi

Bittencourt

2010

Acta Bot. Bras.

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Recebido em 12/02/2010. Aceito em 28/06/2010 RESUMO -(Sistema reprodutivo do Ipê-Branco -Tabebuia roseo-alba (Ridley) Sandwith (Bignoniaceae)). Estudos sobre sistemas reprodutivos têm indicado o predomínio da autoincompatibilidade de ação tardia (AIT) em Bignoniaceae, embora poucas espécies tenham sido investigadas e ocorram outros tipos de sistemas reprodutivos na família. O presente estudo objetivou determinar o sistema reprodutivo de T. roseo-alba através de experimentos de polinizações controladas, análise histológica dos eventos posteriores à polinização, verifi cação do desenvolvimento in situ dos tubos polínicos e testes de germinação de sementes. Apesar de os tubos polínicos penetrarem e fecundarem a maioria dos óvulos em pistilos autopolinizados, o aborto de 100% dos mesmos foi verifi cado e, embora sua abscisão tenha ocorrido entre o quarto e o sexto dia após o início da antese, observou-se um ligeiro crescimento dos óvulos e do ovário precedendo a abscisão, porém inferior ao crescimento nos pistilos submetidos à polinização cruzada. A endospermogênese inicial e a formação do tubo proembriônico também foram mais lentas nos pistilos autopolinizados. A longevidade dos pistilos autopolinizados foi maior que a de pistilos não polinizados, e a taxa de germinação de sementes foi de 93%, sendo todas as sementes monoembriônicas. Os resultados demonstram que T. roseo-alba é espécie auto-estéril, destituída de poliembrionia e que apresenta AIT pós-zigótica. Palavras-chave: autoesterilidade, autoincompatibilidade de ação tardia, endospermogênese, tubo proembriônico ABSTRACT -(Breeding system of the White Trumpet Tree -Tabebuia roseo-alba (Ridley) Sandwith (Bignoniaceae)). Breeding system studies have indicated the predominance of late-acting self-incompatibility (LSI) in Bignoniaceae, despite the relatively few species investigated, and the occurrence of other kinds of breeding systems in this family. This study aimed to determine the breeding system in T. roseo-alba by means of controlled experimental pollination, histological analysis of post-pollination events, and studies of pistil longevity, in situ pollen tube growth and seed germination. Despite pollen tube penetration and fertilization of most ovules of selfed pistils, 100% of these pistils aborted uniformly between the fourth and sixth day after anthesis onset. Ovary and ovule growth, as well as initial endospermogenesis and proembryonal tube formation were verifi ed in selfed pistils before abscission, but the progress of post-pollination development in these pistils was slower than in crossed pistils. The longevity of self-pollinated pistils was greater than in non-pollinated pistils. Seed germinability was 93%, and all seeds were monoembryonic. These results show that T. roseo-alba is a species with post-zygotic LSI, and with no polyembryony.

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“…The flowering and fructification phenology of A. bracteatum was determined, and characterized by the following phenophases: fl oral buds, opened fl owers, small and green fruits, developed fruits, completely open fruits, and seed fall (Fournier 1974, Polatto & Alves Jr 2009. Observations were conducted at fi xed intervals of ten days during one year, to obtain data for a phenological species calendar.…”

Section: Methodsmentioning

confidence: 99%

Pollination of Adenocalymma bracteatum (Bignoniaceae): floral biology and visitors

Almeida-Soares¹,

Polatto²,

Dutra³

et al. 2010

Neotrop. entomol.

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-Adenocalymma bracteatum is a shrub of dense foliage and yellow fl owers, easily found on grasslands areas in Central Brazil. The aim of this study was to determine the reproductive biology and the fl ower visitors of A. bracteatum in a pasture area nearby Ivinhema city, MS (Brazil). The fl owering peak occurs in winter. The fl ower refl ects ultraviolet light. Anthesis begins at 6:30h, and pollen and nectar are the resources to visitors. We captured 1,038 fl oral visitors. The bees Apis mellifera (L.), Trigona sp., Trigona spinipes (Fabricius), (Hymenoptera: Apoidea) and the ant Cephalotes sp. (Hymenoptera: Formicidae) were the main visitors. The reproductive tests indicate that A. bracteatum is self compatible, justifying its expansion in altered environments; however, the largest reproductive success was dependant on cross-pollination and self-pollination, evidencing the pollinators importance. Adenocalymma bracteatum presents melittophilous syndrome and bumblebees were the main pollinators in the area. The correlations observed between the climatic variables and the main pollinator species were low or medium.KEY WORDS: Floral trait, pillager, pollinator, beeThe interactions between animals and plants are infl uenced by several community-specifi c biotic and abiotic factors. The study of such characteristics, joined to the species phenology, is crucial to understand the co-evolutionary and ecological processes observed between plants and pollinators (Pellmyr & Thompson 1996, Thompson 1999, 2005. Although widely spread and diversifi ed, the relations between plants and pollinators are seldom studied regarding the impact of seasonal changes and species phenology on ecological interactions ( . Pollination studies enhance our understanding of such interactions and provide feedback information for the appropriate management and preservation of tropical environments. When the species being studied belong to important families characterized by numerous species, high abundance of individuals, and wider geographic distribution, the information obtained is still more relevant. This is the case of the Bignoniaceae family (Udulutsch et al 2004, Kinoshita et al 2006, with about 800 species and the predominance of lianas belonging to tribe Bignoniae in the Neotropical region (Gentry 1974a(Gentry , 1980. With the aim of increasing the knowledge about the importance of ecological relations on pollination, the objective of this study was to identify the fl oral visitors of Adenocalymma bracteatum (tribe Bignoniae), to describe the behaviour of the most frequent and the potential effective pollinators, and to characterize the fl oral and reproductive biology of the relation between environmental factors and the visiting species. Material and MethodsField research was conducted on a roadside approximately three kilometers north of urban Ivinhema city, state of Mato Grosso do Sul (22º18'S, 53º48'W), Brazil. This is a transition area in terms of fl oristic composition, containing grasses, shrubs and creepers (in pastures...

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Sistema reprodutivo de Sparattosperma leucanthum (Vell.) K. Schum. (Bignoniaceae)

Cited by 7 publications

References 22 publications

Exploitation of floral resources on Sparattosperma leucanthum (Bignoniaceae): foraging activity of the pollinators and the nectar and pollen thieves

Exploitation of floral resources on Sparattosperma leucanthum (Bignoniaceae): foraging activity of the pollinators and the nectar and pollen thieves

Sistema reprodutivo do Ipê-Branco: Tabebuia roseo-alba (Ridley) Sandwith (Bignoniaceae)

Pollination of Adenocalymma bracteatum (Bignoniaceae): floral biology and visitors

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