Does Late-acting Self-incompatibility (LSI) Show Family Clustering? Two More Species of Bignoniaceae with LSI:Dolichandra cynanchoides and Tabebuia nodosa

Gibbs, Peter; Bianchi, Marta B.

doi:10.1006/anbo.1999.0933

Cited by 88 publications

(95 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Incompatible mating is characterised by a failure in gametic nuclei fusion at the embryo sac that results in flower abscission (Knight and Rogers, 1955;Cope, 1962), which is considered a late-acting mechanism (Gibbs and Bianchi, 1999). The genetic control of self-incompatibility in cacao appears to be determined by a nuclear multiallelic S locus (Knight and Rogers, 1955;Cope, 1976), which is affected by other independent loci (Cope, 1958(Cope, , 1962.…”

Section: Introductionmentioning

confidence: 99%

Understanding the genetic diversity, spatial genetic structure and mating system at the hierarchical levels of fruits and individuals of a continuous Theobroma cacao population from the Brazilian Amazon

et al. 2010

View full text Add to dashboard Cite

Understanding the mating patterns of populations of tree species is a key component of ex situ genetic conservation. In this study, we analysed the genetic diversity, spatial genetic structure (SGS) and mating system at the hierarchical levels of fruits and individuals as well as pollen dispersal patterns in a continuous population of Theobroma cacao in Pará State, Brazil. A total of 156 individuals in a 0.56 ha plot were mapped and genotyped for nine microsatellite loci. For the mating system analyses, 50 seeds were collected from nine seed trees by sampling five fruits per tree (10 seeds per fruit). Among the 156 individuals, 127 had unique multilocus genotypes, and the remaining were clones. The population was spatially aggregated; it demonstrated a significant SGS up to 15 m that could be attributed primarily to the presence of clones. However, the short seed dispersal distance also contributed to this pattern. Population matings occurred mainly via outcrossing, but selfing was observed in some seed trees, which indicated the presence of individual variation for self-incompatibility. The matings were also correlated, especially within (r p(m) ¼ 0.607) rather than among the fruits (r p(m) ¼ 0.099), which suggested that a small number of pollen donors fertilised each fruit. The paternity analysis suggested a high proportion of pollen migration (61.3%), although within the plot, most of the pollen dispersal encompassed short distances (28 m). The determination of these novel parameters provides the fundamental information required to establish long-term ex situ conservation strategies for this important tropical species.

show abstract

Section: Introductionmentioning

confidence: 99%

Understanding the genetic diversity, spatial genetic structure and mating system at the hierarchical levels of fruits and individuals of a continuous Theobroma cacao population from the Brazilian Amazon

et al. 2010

View full text Add to dashboard Cite

show abstract

“…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

“…Portanto, a discriminação entre a autoincompatibilidade e a depressão endogâmica de ação precoce como possíveis causas da autoesterilidade frequentemente depende da realização de análises detalhadas da germinação e do desenvolvimento in situ dos tubos polínicos, bem como de outros eventos posteriores à polinização no interior dos ovários/frutos e dos óvulos/sementes (Sage et al 1999;Gibbs & Bianchi 1999;Bittencourt et al 2003;Bittencourt & Semir 2005;2006). Gandolphi & Bittencourt Junior: Sistema reprodutivo do Ipê-Branco -Tabebuia roseo-alba (Ridley) Sandwith, (Bignoniaceae) Nas plantas autoincompatíveis, os tubos polínicos podem ser inibidos no estigma, no estilete, ou a reação da incompatibilidade pode manifestar-se após os tubos polínicos terem alcançado o ovário (Bittencourt 2008).…”

Section: Introductionunclassified

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

Gandolphi

Bittencourt

2010

Acta Bot. Bras.

View full text Add to dashboard Cite

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.

show abstract

“…Griseb. (Gibbs & Bianchi, 1999), Jacaranda macrantha (Bittencourt 1981) and Jacaranda racemosa (Bittencourt Júnior & Semir 2006). Studies over the last two decades have shown that outbreeding and LSI are common features in many tropical trees (Bawa et al, 1985) but seem to be such common features in the Bignoniaceae that a phylogenetic component has been argued to explain such familial clustering (Gibbs & Bianchi 1999).…”

Section: Discussionmentioning

confidence: 99%

“…But despite low density and sometimes asynchronous flowering, which have led to misconceptions about the ability of these plants to attract pollinators and have allogamous fruit set (Corner 1954, Fedorov 1966, they do attract efficient long distance pollinators as large solitary or subsocial bees (Bawa et al 1985, Dick et al 2004. For the tropical Bignoniaceae, a diverse assemblage of pollinators seems to have influenced flowering morphology and guaranteed fruit-set of these largely self-incompatible plants (Gentry 1974a, Gibbs & Bianchi 1999, Bittencourt Júnior & Semir 2004, Gottsberger & Silberbauer-Gottsberger 2006. Flowering phenology patterns, defined according to the duration and intensity, were also related with pollination biology (Gentry 1974b, Van Schaik et al 1993, Morellato et al 2000.…”

Section: Introductionmentioning

confidence: 99%

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

Maués¹,

Oliveira²,

Kanashiro³

2008

Rev. bras. Bot.

View full text Add to dashboard Cite

-(Pollination biology in Jacaranda copaia (Aubl.) D. Don (Bignoniaceae) at the "Floresta Nacional do Tapajós", Central Amazon, Brazil). Jacaranda copaia (Aubl.) D. Don is a pioneer tree widespread in the Brazilian Amazon, usually found colonizing forest gaps and altered areas, and the forest fragment edges. This study investigated aspects of the floral biology, breeding system and pollinators of J. copaia trees. Flowering lasts from August to November, during the low rainfall period extending up to four weeks per tree and 3-4 months for the population as a whole, characterizing a cornucopia flowering pattern. The fruit set ends in the beginning of the rainy season, with wind dispersed winged seeds.Fruit set from open pollination was 1.06% (n = 6,932). Hand pollination using self-pollen (n = 2,099) did not set fruits. Cross-pollination resulted in 6.54% fruit set (n = 2,524), representing six times more than the natural pollination rate (1.06%, n = 6,932). Flowers excluded from insect visitation (automatic self-pollination) did not set fruits (n = 5,372). Pollen tube growth down to ovary was detected under fluorescence microcoscopy in cross-pollinated and selfed pistils. The species is an obligate allogamous plant, with late-acting self-incompatibility system. Approximately 40 species of native bees visited the flowers, but the main pollinators were medium-sized solitary bees as Euglossa and Centris species due to the compatibility between their body sizes with the corolla tube, direct contact with the reproductive structures and high frequency of visits.Key words -bees, floral biology, late-acting self-incompatibility (LSI), phenology, pollinators RESUMO -(Biologia da polinização de Jacaranda copaia (Aubl.) D. Don (Bignoniaceae) na Floresta Nacional do Tapajós, Amazônia Ocidental, Brasil). Jacaranda copaia (Aubl.) D. Don é uma árvore pioneira distribuída por toda Amazônia brasileira, encontrada colonizando clareiras, áreas alteradas e bordas de fragmentos florestais. O presente estudo investigou aspectos da biologia floral, sistema reprodutivo e polinizadores de J. copaia. O florescimento ocorre de agosto a novembro, durante o período de menor precipitação pluviométrica, estendendo-se por até quatro semanas por indivíduo e três ou quatro meses para a população, caracterizando um padrão de floração cornucopia. A frutificação termina no início da estação chuvosa, com a dispersão anemocórica das sementes aladas. A taxa de frutificação natural foi de 1,06% (n = 6.932). As flores autopolinizadas manualmente (n = 2.099) não produziram frutos. A polinização cruzada (n = 2.524) resultou em 6,54% frutos, representando seis vezes mais do que a polinização natural (1,06%, n = 6.932). As flores protegidas da visita de polinizadores (autopolinização espontânea) não formaram frutos (n = 5.372). O crescimento dos tubos polínicos foi detectado sob microscopia de fluorescência tanto nos pistilos autopolinizados quanto nos submetidos à polinização cruzada. A espécie foi considerada alógama obrigatória, com mecanismo de a...

show abstract

Does Late-acting Self-incompatibility (LSI) Show Family Clustering? Two More Species of Bignoniaceae with LSI:Dolichandra cynanchoides and Tabebuia nodosa

Cited by 88 publications

References 41 publications

Understanding the genetic diversity, spatial genetic structure and mating system at the hierarchical levels of fruits and individuals of a continuous Theobroma cacao population from the Brazilian Amazon

Understanding the genetic diversity, spatial genetic structure and mating system at the hierarchical levels of fruits and individuals of a continuous Theobroma cacao population from the Brazilian Amazon

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

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

Contact Info

Product

Resources

About