Distilia e homostilia em espécies de Palicourea Aubl. (Rubiaceae) do Cerrado do Brasil Central

Consolaro, Hélder; Toledo, Rafaela De Cezare Parmezan; Ferreguti, Rafael; Hay, John Du Vall; Oliveira, Paulo E.

doi:10.1590/s0100-84042009000400007

Cited by 16 publications

(33 citation statements)

References 32 publications

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“…As we mentioned earlier, O. salzmannii presents a high degree of herkogamy reciprocity, but many other distylous species of Rubiaceae present a considerable variation in the distance between style-stigma and stamen heights between morphs, so the herkogamy reciprocity is not perfect. This occurs for example in: Palicourea padifolia (Hernández & Ornelas 2003); P. officinalis (Consolaro et al 2009), Psychotria chiapensis (Faivre & McDade 2001) and P. poeppigiana (Coelho & Barbosa 2004), etc.…”

Section: Reciprocitymentioning

confidence: 99%

Morpho-anatomical and morphometric studies of the floral structures of the distylous Oldenlandia salzmannii (Rubiaceae)

2016

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Th e genus Oldenlandia (Rubiaceae) has a confl icting generic delimitation, with representatives that show diff erent fl oral syndromes. Oldenlandia salzmannii is a marshy herb that is widespread in South America. It is heterostylous, specifi cally distylous, and self-compatible. Recent molecular phylogenetic studies found that this species forms a clade that is isolated from the remaining described taxa of Oldenlandia. Information about the fl oral anatomy and reproductive biology of genera in the Spermacoceae tribe, particularly Oldenlandia, is insuffi cient, especially among the neotropical species. Accordingly, the present study aimed at contributing information on the reproductive biology of Oldenlandia salzmannii by analyzing its fl oral morpho-anatomy, morphometrics and phenology of both fl oral morphs. Th ese analyses were conducted with natural, cultivated and fi xed material using optical and scanning electron microscopes. Morphologically, the species is typically heterostylous with two fl oral morphs, long-styled and short-styled, the main diff erence being the indument of the corolla. Th e short-styled fl owers have larger anthers and pollen grains. Morphometrics show a high degree of herkogamic reciprocity. Th e mature ovules have a hemitropous position, which is the fi rst record of this position for the Spermacoceae tribe. Th is study represents the fi rst comprehensive morphological study of Oldenlandia salzmannii.

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Section: Reciprocitymentioning

confidence: 99%

Morpho-anatomical and morphometric studies of the floral structures of the distylous Oldenlandia salzmannii (Rubiaceae)

2016

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“…A recent phylogenetic analysis showed that such unbalanced morph ratios can arise independently (Sakai & Wright 2008). Such ratios can also be observed among populations of the same species (Koch et al 2010;Consolaro et al 2011;Farias et al 2012), as well as in congeneric species (Consolaro et al 2009), although other species are relatively stable (e.g. Machado et al 2010).…”

Section: Discussionmentioning

confidence: 96%

“…Th e release of pollen was determined by observation of loose pollen on the anthers. Stigma receptivity was determined by the separation of the stigma lobes (n = 16), which is usually suitable for studies of Rubiaceae (Coelho & Barbosa 2003, Consolaro et al 2005, Consolaro et al 2009, Consolaro et al 2011.…”

Section: Floral Biologymentioning

confidence: 99%

“…However, some authors argue that, in certain families (especially Rubiaceae), the morphological and physiological integrity of the supergene diff ers from that seen in other families (Richards 1986;Lewis & Jones 1992;Barrett & Shore 2008;Consolaro et al 2011). Some Rubiaceae genera, such as Psychotria, Palicourea, Coccocypselum, Declieuxia, Sabicea, Guettarda and Manettia, are known to be typically distylous but present anomalies or breakdown of distyly (Sobrevila et al 1983;Hamilton 1990;Richards & Koptur 1993;Passos & Sazima 1995;Faivre & McDade 2001, Coelho & Barbosa 2003Consolaro et al 2009).…”

Section: Introductionmentioning

confidence: 99%

“…In recent decades, the number of studies on heterostyly and phenology of heterostylous species in the cerrado has been increasing (Monteiro et al 1991;Coelho & Barbosa 2003;Coelho & Barbosa 2004;Consolaro et al 2005;Toledo et al 2007;Lenza et al 2008;Oliveira 2008;Consolaro et al 2009;Machado et al 2010;Consolaro et al 2011) and could be compared to those conducted in the Atlantic Forest (Passos & Sazima 1995;Lopes & Buzato 2005;Castro & Oliveira 2002;Castro et al 2004;Teixeira & Machado 2004a, 2004bRossi et al 2005;Pereira et al 2006;Mendonça & Anjos 2006;Virillo et al 2007, Fonseca et al 2008. To increase understanding of the heterostyly system in the cerrado, this study aimed to investigate the phenology, distylous features, reproductive biology and fl oral visitors of Psychotria goyazensis Mull.…”

Section: Introductionmentioning

confidence: 99%

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Atypical distyly in Psychotria goyazensis Mull. Arg. (Rubiaceae), an intramorph self-compatible species

Rodrigues

Consolaro

2013

Acta Bot. Bras.

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Distyly is a genetically controlled fl oral dimorphism, characterized by the reciprocal positioning of pin and thrum morphs, a heteromorphic incompatibility system and a balanced morph ratio (isoplethy). Th is study aimed to investigate the phenology, features of distyly, reproductive biology, and fl oral visitors of Psychotria goyazensis Mull. Arg. (Rubiaceae), an intramorph self-compatible species, in a tropical semideciduous forest in the municipality of Catalão, located in the state of Goiás, Brazil. Th e phenology was recorded for a sample of individuals, the fl oral morphology being described using fresh and fi xed material. Th e incompatibility system was tested using controlled hand pollinations. Floral visitors were collected and identifi ed. Blooming began in November 2009 and ended in April 2010. Fruits developed from December 2009 to March 2010. Th e population presented atypical distyly, because only plants with pin fl owers were found. Th e intramorph and open pollinations set more fruits than did spontaneous self-pollinations. Th e main fl ower visitors were Systropus sp. (Diptera), as well as Hymenoptera and Lepidoptera species. Morphological variations in distyly can occur by breakdown/permutation of the gene that controls the polymorphism. However, some authors argue that, in Rubiaceae, genetic control of the incompatibility system can operate independently of the morphological factor, and species might respond in diff erent ways to the same selective pressures.

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Complementary roles of hummingbirds and bees: Pollen pickup, pollen deposition, and fruit production in the distylous Palicourea rigida

Furtado

Matias

Pérez‐Barrales

et al. 2023

American J of Botany

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Premise: Distyly is a condition in which individual plants in a population express two floral morphs, L-and S-morph, characterized by reciprocal placements of anthers and stigmas between morphs. The function of distyly requires that pollinators collect pollen from L-and S-morphs on different parts along their bodies to then deposit it on the stigmas of the opposite morph, known as legitimate pollination. However, different pollinator groups might differ in the ability to transfer pollen legitimately. Methods: We investigated patterns of pollen pickup along the body of different functional groups (hummingbirds and bees) using preserved specimens to analyze their role in the reproductive success of Palicourea rigida. We measured pollen deposition on the body of pollinators, on stigmas, and fruit production after a single visit.Results: Pollen from L-and S-flowers appeared segregated on different body parts of the hummingbird and bee used in the study. S-pollen was deposited primarily on the proximal regions (near the head), and L-pollen was placed in the distal regions (tip of the proboscis and bill). Hummingbirds were more efficient at legitimate pollination than bees, particularly to S-stigmas. However, fruit formation after single visits by both pollinators was similar. Conclusions: The morphology of distylous flowers allows the segregated placement of L-and S-pollen on different body parts of the animal specimens used, facilitating the promotion of legitimate pollen transfer, an observation consistent between the two functional pollinator groups. Also, the results show that full fruit set requires more than one visit.

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Distilia e homostilia em espécies de Palicourea Aubl. (Rubiaceae) do Cerrado do Brasil Central

Cited by 16 publications

References 32 publications

Morpho-anatomical and morphometric studies of the floral structures of the distylous Oldenlandia salzmannii (Rubiaceae)

Morpho-anatomical and morphometric studies of the floral structures of the distylous Oldenlandia salzmannii (Rubiaceae)

Atypical distyly in Psychotria goyazensis Mull. Arg. (Rubiaceae), an intramorph self-compatible species

Complementary roles of hummingbirds and bees: Pollen pickup, pollen deposition, and fruit production in the distylous Palicourea rigida

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