Pollination biology in Jacaranda copaia (Aubl.) D. Don. (Bignoniaceae) at the "Floresta Nacional do Tapajós", Central Amazon, Brazil

Maués, M. M.; Oliveira, Paulo Eugênio; Kanashiro, Milton

doi:10.1590/s0100-84042008000300015

Cited by 25 publications

(29 citation statements)

References 43 publications

(49 reference statements)

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“…D. Don., which show large inflorescences and hundreds of flowers at the peak of flowering (Gottsberger & SilberbauerGottsberger 2006;Maués et al 2008). The small amount of accumulated nectar in species with a great amount of flowers can force floral visitors to shorten their visits and to visit a greater number of flowers in order to collect the number of calories needed.…”

Section: Discussionmentioning

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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Section: Discussionmentioning

confidence: 99%

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

et al. 2013

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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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“…Jacaranda copaia (Bignoniaceae) is a pioneer tree widespread across the Amazon, where it colonizes gaps in lowland moist and wet forest. J. copaia trees have an annual flowering pattern, with up to 97% of monitored trees flowering each year (Maués et al, 2008). In the National Forest of Tapajó s, the flowers of J. copaia attract around 40 species of bees, wasps, butterflies and hummingbirds, but the main pollinators are medium-sized solitary bees, Euglossa spp.…”

Section: Study Speciesmentioning

confidence: 99%

“…and Centris spp. (Maués et al, 2008). The mature fruit contains up to 250 winged seeds, which are wind-dispersed.…”

Section: Study Speciesmentioning

confidence: 99%

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Long-term impacts of selective logging on two Amazonian tree species with contrasting ecological and reproductive characteristics: inferences from Eco-gene model simulations

et al. 2014

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The impact of logging and subsequent recovery after logging is predicted to vary depending on specific life history traits of the logged species. The Eco-gene simulation model was used to evaluate the long-term impacts of selective logging over 300 years on two contrasting Brazilian Amazon tree species, Dipteryx odorata and Jacaranda copaia. D. odorata (Leguminosae), a slow growing climax tree, occurs at very low densities, whereas J. copaia (Bignoniaceae) is a fast growing pioneer tree that occurs at high densities. Microsatellite multilocus genotypes of the pre-logging populations were used as data inputs for the Eco-gene model and post-logging genetic data was used to verify the output from the simulations. Overall, under current Brazilian forest management regulations, there were neither short nor long-term impacts on J. copaia. By contrast, D. odorata cannot be sustainably logged under current regulations, a sustainable scenario was achieved by increasing the minimum cutting diameter at breast height from 50 to 100 cm over 30-year logging cycles. Genetic parameters were only slightly affected by selective logging, with reductions in the numbers of alleles and single genotypes. In the short term, the loss of alleles seen in J. copaia simulations was the same as in real data, whereas fewer alleles were lost in D. odorata simulations than in the field. The different impacts and periods of recovery for each species support the idea that ecological and genetic information are essential at species, ecological guild or reproductive group levels to help derive sustainable management scenarios for tropical forests.

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Pollination biology in Jacaranda copaia (Aubl.) D. Don. (Bignoniaceae) at the "Floresta Nacional do Tapajós", Central Amazon, Brazil

Cited by 25 publications

References 43 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

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

Long-term impacts of selective logging on two Amazonian tree species with contrasting ecological and reproductive characteristics: inferences from Eco-gene model simulations

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