Floral visitors and reproductive strategies in five melittophilous species of Bignoniaceae in Southeastern Brazil

Yanagizawa, Yuriko A. N. P.; Maimoni-Rodella, Rita de Cássia Sindrônia

doi:10.1590/s1516-89132007000700015

Cited by 20 publications

(31 citation statements)

References 31 publications

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“…Our results are similar to those obtained in a previous study on crossed and natural pollination, and emasculation for the same species (Yanagizawa & Maimoni-Rodella 2007). However, differently from our study, those authors could not reach fructifi cation in their tests on manual and spontaneous pollination.…”

Section: Resultssupporting

confidence: 86%

“…Whereas, the fructifi cation produced after natural pollination was directly affected by these factors. Several other species of Bignoniaceae also had low rates of natural fructifi cation (Stephenson 1979, Bertin 1982, Bittencourt et al 2003, Yanagizawa & Maimoni-Rodella 2007. The absence of fruit formation in emasculated fl owers, the low fructifi cation rate obtained by spontaneous self-pollination, and the low index value of spontaneous self-pollination ( ISS < 0.25) indicates the high importance of pollinators services for this species reproduction.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

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

Almeida-Soares¹,

Polatto²,

Dutra³

et al. 2010

Neotrop. entomol.

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“…Eighty percent of the studied species present self-sterility, which is often characterized as a result of late-acting self-incompatibility (LSI) mechanisms (Gibbs & Bianchi 1993;Bittencourt et al 2003;Bittencourt & Semir 2005;Gandolphi & Bittencourt 2010). To date, all neopolyploid Bignoniaceae species have been found to be self-compatible (Gobatto-Rodrigues & Stort 1992;Bittencourt & Semir 2005;Bittencourt & Moraes 2010;Firetti-Leggieri et al 2013;Sampaio et al 2013a), although not all self-compatible species are neopolyploids (Dutra & Machado 2001;Yanagizawa & Maimoni-Rodella 2007;Qu et al 2007). Therefore, self-fertility in Bignoniaceae could be caused by various factors, of which polyploidy appears to be one of the most important.…”

Section: Introductionmentioning

confidence: 99%

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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“…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

“…Tabebuia chrysotricha), H. heptaphyllus (syn. T. heptaphylla) (Bittencourt & Semir 2005), Arrabidaea brachypoda, A. samydoides e Jacaranda oxyphylla (Yanagizawa & Maiomni-Rodella 2007) todas as demais espécies são autoincompatíveis. O predomínio da autoincompatibilidade em Bignoniaceae parece indicar que as barreiras à autofertilidade nesta família são principalmente de natureza genética.…”

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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Floral visitors and reproductive strategies in five melittophilous species of Bignoniaceae in Southeastern Brazil

Abstract: ABSTRACT

Cited by 20 publications

References 31 publications

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

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

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

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

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