Pollination Biology of Jacaranda oxyphylla with an Emphasis on Staminode Function

Guimarães, Elza; Stasi, Luiz Cláudio Di; Maimoni-Rodella, Rita de Cássia Sindrônia

doi:10.1093/aob/mcn152

Cited by 48 publications

(51 citation statements)

References 48 publications

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“…The onset of anthesis and flower receptivity during the day, together with the sweet-smelling yellow corolla and ≈ 30% nectar concentration, observed in Handroanthus serratifolius fit the classical concept of melittophily (Faegri & van der Pijl 1979 Guimarães et al 2008). The activity of nectar robbers in flowers with small amounts of nectar may mimic that of their activity in empty flowers and promote more movement among inflorescences and trees (Correia et al 2006;Ishii et al 2008;Milet-Pinheiro & Schlindwein 2009).…”

Section: Discussionmentioning

confidence: 75%

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: 75%

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

et al. 2013

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“…The extensive development of plastids containing tubular osmiophilic structures and electrondense droplets, together with the proliferation of smooth endoplasmic reticulum, have been described in many lipophilic secretory structures, particularly in those secreting terpenes (Cheniclet & Carde 1985;Figueiredo & Pais 1994;Ascensão et al 1997;Monteiro et al 1999;Turner et al 1999;Machado et al 2006;Possobom et al 2015;Sá-Haiad et al 2015). Terpenes were histochemicaly detected in capitate glandular trichomes in both Zeyheria species, which may participate in the attraction of mutualists or in the deterrence of antagonists (Harborne 1997;Nishida 2002;Raguso 2004;Machado et al 2006;Guimarães et al 2008).…”

Section: Discussionmentioning

confidence: 99%

A reduced, yet functional, nectary disk integrates a complex system of floral nectar secretion in the genus Zeyheria (Bignoniaceae)

2016

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Th e genus Zeyheria (Bignoniaceae) comprises only two species, both of which have been described as possessing a reduced and non-functional nectary disk. Despite the importance of this evolutionary change in the fl oral nectary, these functional assumptions have been based on disk size and on the distribution, abundance and histochemistry of corolla-borne trichomes. By combining methods on light and electron microscopy, here we investigated the functionality of the reduced nectary disk and describe all of the tissues and structures of the nectar chamber in order to determine the sites of fl oral nectar secretion in both Zeyheria species. . Our data fi nd the fl oral nectary traits of both species to be very similar, although diff ering in their cellular contents. Subcellular evidence in both species indicated that disk, stipe and petal axils were, predominantly, involved in hydrophilic secretion, while capitate glandular trichomes produced lipophilic secretion and papillae produced mixed secretion. Our study shows that in spite of its reduced size, the reduced disk functions in nectar secretion in both species of Zeyheria. Th is kind of nectary system is a novelty for Bignoniaceae, since it comprises several tissues and structures functioning in an integrated fashion.

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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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Pollination Biology of Jacaranda oxyphylla with an Emphasis on Staminode Function

Cited by 48 publications

References 48 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

A reduced, yet functional, nectary disk integrates a complex system of floral nectar secretion in the genus Zeyheria (Bignoniaceae)

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

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