Distyly and sequential pollinators of Psychotria nuda (Rubiaceae) in the Atlantic rain forest, Brazil

Castro, Cibele Cardoso; Araujo, Andréa Cardoso

doi:10.1007/s00606-003-0036-8

Cited by 56 publications

(22 citation statements)

References 35 publications

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“…In the present study and in the study of Castro and Araújo (2004), compatible tubes took no more than 12 h to reach the ovary. While incompatible treatments exhibited variation in pollen tube growth.…”

Section: Discussionmentioning

confidence: 92%

“…For species with HetSI, most studies only indicate the incompatibility sites, as already shown for Psychotria nuda (Castro and Araújo 2004;Pereira et al 2006). Descriptions of the incompatibility reaction are restricted to a few species of some families (Shivanna et al 1981;Bawa and Beach 1983;Anderson and Barrett 1986;Scribailo and Barrett 1991;Tamari et al 2001).…”

Section: Introductionmentioning

confidence: 92%

“…HetSI is a sporophytically controlled, diallelic incompatibility system, which prevents or reduces self-and intra-morph fertilizations (Endress 1998). In this system, pollen from the same flower or from a flower of the same morph is inhibited in germination, hydration or growth in the pistil, preventing fecundation (e.g., Shivanna et al 1981;Faivre 2002;Castro and Araújo 2004). Although several studies have revealed differences between L-and S-morphs in several traits related to prepollination biology, such as pollen production and removal patterns (McKenna 1992), there are no data regarding the interaction between the pollen and pistil cells during the heteromorphic incompatibility reaction.…”

Section: Introductionmentioning

confidence: 96%

See 2 more Smart Citations

Self-incompatibility in a distylous species of Rubiaceae: is there a single incompatibility response of the morphs?

2009

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Heterostyly is a genetically controlled floral polymorphism usually associated with an incompatibility system. This set of features is known to occur in several angiosperm families, but some aspects of its biology has not been well studied. The present study investigates cellular aspects of the pollen-pistil interaction after compatible and incompatible pollinations of Psychotria nuda, to increase our knowledge of heteromorphic self-incompatibility (HetSI). The use of bright field, fluorescence and transmission electron microscopy methods allowed us to demonstrate that pollen tubes behave differently after incompatible and compatible pollinations. Pollen tubes were particularly distinct after incompatible pollinations of L- and S-morph flowers. Relative to compatible pollen tubes, incompatible L-morph tubes had a drastic reduction in cellular contents, but no cell rupture. Incompatible S-morph tubes exhibited dense cytoplasm in apical regions, as well as in other regions, accompanied by a rupture of the apex. These results support the hypothesis that L- and S-morph flowers have different incompatibility mechanisms during HetSI.

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Section: Discussionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 96%

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Self-incompatibility in a distylous species of Rubiaceae: is there a single incompatibility response of the morphs?

2009

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“…On average, short-styled individuals in both species had fl owers with larger corolla size, longer fl oral tubes and larger calyxes. Increased fl oral size, derived mainly from long corolla tubes, has been associated with the short-styled morph in other distylous species including several Amsinckia species, genus Glandora, and Lithospermum densifl orum (Boraginaceae; Ganders, 1979;Li and Johnston, 2001;Ferrero et al, 2011); Plumbago auriculata (Plumbaginaceae; Ferrero et al, 2009); Primula vulgaris and P. veris (Primulaceae; Kálmán et al, 2007); Gaertnera vaginata, Guettarda scabra, Palicourea demissa, P. padifolia, Psychotria carthagenensis, and P. nuda (Rubiaceae; Richards and Koptur, 1993;Pailler and Thompson, 1997;Hernández and Ornelas, 2003;Cardoso de Castro and Cardoso-Araujo, 2004;Valois-Cuesta et al, 2011;Rodrigues-Faria et al, 2012). In short-styled fl owers, corolla tube length probably plays a more important role in positioning sex organs at an appropriate distance, and thus increasing intermorph pollen transfer accuracy, than in long-styled fl owers (Pailler and Thompson, 1997;Faivre and McDade, 2001;Kálmán et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Distylous traits in Cordia dodecandra and Cordia sebestena (Boraginaceae) from the Yucatan Peninsula

Canché-Collí

Canto

2014

Bot. Sci.

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Abstract:Distyly is a genetically-controlled polymorphism with two fl oral morphs exhibiting spatial, reciprocal separation between stigmas and anthers; one morph presents styles above anthers, and the other styles below anthers. Distyly is usually linked to a self-incompatibility system that prevents self-pollination and crosses between plants of the same morph, thereby ensuring symmetrical mating and equal morph ratios within populations. This study is the fi rst description of distylous traits in the tropical tree species Cordia dodecandra and C. sebestena from the Yucatan Peninsula. Principal components analysis of fl ower morphological traits identifi ed segregation into two groups with characteristically distylous morphology. Estimation of reciprocal herkogamy using indices showed almost perfect reciprocity in the distance between long and short sexual organs in the two fl ower morphs of both species. Reciprocity between organs was lower in C. dodecandra, suggesting less accuracy in pollen transference between morphs. Self-incompatibility was observed for C. dodecandra, but could not be confi rmed for C. sebestena. However, a 1:1 fl oral morph ratio within the sampled C. sebestena populations suggests the existence of a distylous, self-incompatibility system in this species. Morph distribution in C. dodecandra did not follow a typically distylous distribution, suggesting a disruption in population processes such as seed dispersion and seedling establishment in this species. The reported data confi rm the existence of the distyly syndrome in the two Cordia species. Key words: distyly, morph ratio, reciprocal herkogamy, self-incompatibility.Resumen: La distilia es la separación recíproca entre estigma y anteras, entre plantas de una población, pudiéndose distinguir individuos con fl ores de estilo largo y anteras cortas e individuos con fl ores de estilo corto y anteras largas. Involucrados en este polimorfi smo se encuentran rasgos morfológicos de las fl ores y una auto-incompatibilidad controlada por un sistema de dos alelos que resulta en una proporción de tipos fl orales uno a uno dentro de una población. En este trabajo se explora las características de distilia en dos especies cercanas de árboles tropicales que se distribuyen en la duna costera y en los remanentes de huertos mayas en Yucatán. El análisis de componentes principales mostró la segregación de dos grupos de individuos con diferente morfología fl oral en ambas especies. Los índices de reciprocidad señalaron que la hercogamia entre los órganos largos y cortos se ajusta de forma casi perfecta a lo esperado en un sistema distílico con autoincompatibilidad sexual en Cordia sebestena y C. dodecandra. Sin embargo, en esta última especie se observó una mayor variación en la precisión en la posición de los órganos recíprocos, pudiendo tener consecuencias en la exactitud con la que el polen es depositado sobre el estigma. Las pruebas de incompatibilidad realizadas únicamente en C. dodecandra mostraron que los individuos cuyas fl ores recibieron polen...

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“…This foraging behavior may decrease pollen flow between individuals, since the hummingbird visited only flowers in the patch (es) included in its territory (Feinsinger & Colwell 1978). The observation of territorial behavior in females of T. furcata differs from that recorded for an Atlantic congener (T. glaucopsis) during visits to flowers of Psychotria nuda Cham & Schltdl.-Rubiaceae (Castro & Araujo 2004) and Vriesea rodigasiana E. Morren -Bromeliaceae (Rocca de Andrade 2006). In those species, the males of T. glaucopis presented aggressive and territorial behavior, while females foraged in "trap lines".…”

Section: Treatmentsmentioning

confidence: 93%

Pollination biology and reproduction of Seemannia sylvatica (Kunth) Hanstein (Gesneriaceae) in the Serra da Bodoquena National Park, Mato Grosso do Sul

2011

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Abstract:In Brazil, the family Gesneriaceae is represented by 23 genera and approximately 200 species. Seemannia sylvatica is an herb that occurs in dense populations in the riverbeds at Serra da Bodoquena. Goals of this study were to report the floral biology (on the first five days of anthesis), as well as to determine the breeding system and the pollinators of S. sylvatica. Data collection was conducted from June 2005 to July 2006 through monthly field trips, lasting for five days. Data on floral biology, breeding system and on the floral visitors were taken from individuals located along a track 2500 m long, in riparian forest of Salobrinha river. Flowers of S. sylvatica are tubular, red, with no perceptive odor and lasted more than five days (ca. 10 -20 days in individuals transferred to an urban garden and kept in vases). Seemania sylvatica is protandrous, and the male phase occurred between the first and the fourth days of anthesis, while the female one started in the fifth day. Mean nectar volume secreted was 4.77 ± 3.2 µl, with a significative variation among flowers of different ages. Otherwise, nectar concentration average was 9.71 ± 4.41%, and did not varied significantly in flowers of different ages. The flowers of S. sylvatica were pollinated mainly by the hummingbirds Phaethornis pretrei and Thalurania furcata, and pierced by the bee Ceratina chloris. The butterfly Parides anchises orbygnianus was considered an occasional pollinator of these flowers. Seemannia sylvatica is selfcompatible, since fruit set occurred on the experiments of spontaneous self-pollination, manual self-pollination, crosspollination and open pollination (control). The protandry, coupled with the pattern of nectar production, characterized by low volume and solute concentration, which induces the pollinators to visit different flowers in a given circuit foraging, act maximizing the likelihood of cross-pollination in S. sylvatica. Moreover, the high proportion of fruit set by autogamy is an important strategy considering that S. sylvatica is visited by few species, being pollinated mainly by P. pretrei. Therefore, in the absence of these visitors, the formation of fruits may be achieved. Keywords: breeding system, ornithophily, Phaethornis pretrei, protandry, riparian forest.CAMARGO, E., RODRIGUES, L.C. & ARAUJO, A.C. Biologia da polinização e reprodução de Seemannia sylvatica (Kunth) Hanstein (Gesneriaceae) no Parque Nacional da Serra da Bodoquena, Mato Grosso do Sul. Biota Neotrop. 11(4): http://www.biotaneotropica.org.br/v11n4/pt/abstract?article+bn02911042011Resumo: No Brasil, a família Gesneriaceae é representada por 23 gêneros e cerca de 200 espécies. Seemannia sylvatica é uma espécie herbácea que ocorre em densas populações nos leitos de rios da região da Serra da Bodoquena. Os objetivos deste estudo foram conhecer a biologia floral (nos primeiros cinco dias de antese), determinar o sistema reprodutivo e os polinizadores de S. sylvatica. A coleta de dados foi realizada no período de junho de 2005 a julho de 2006 através...

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Distyly and sequential pollinators of Psychotria nuda (Rubiaceae) in the Atlantic rain forest, Brazil

Cited by 56 publications

References 35 publications

Self-incompatibility in a distylous species of Rubiaceae: is there a single incompatibility response of the morphs?

Self-incompatibility in a distylous species of Rubiaceae: is there a single incompatibility response of the morphs?

Distylous traits in Cordia dodecandra and Cordia sebestena (Boraginaceae) from the Yucatan Peninsula

Pollination biology and reproduction of Seemannia sylvatica (Kunth) Hanstein (Gesneriaceae) in the Serra da Bodoquena National Park, Mato Grosso do Sul

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