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| Fernandes,G. Wilson; Duarte,Heitor Monteiro; Silveira,Fernando A. O.; Broetto,Fernando; Lüttge,Ulrich; Rennenberg,Heinz. |
| ABSTRACT Previous ecological studies of dioecious plant species have found that female plants preferentially occur at lower altitudes where there are typically better nutritional conditions, while male plants often occur in less favorable sites. We compared the ecophysiological performance of male and female plants in three populations of the dioecious Baccharis concinna, an endemic species of rupestrian grasslands of Serra do Cipó, in southeastern Brazil. We hypothesized that physiological differences between the sexes would explain the distribution patterns of the populations. Analyses of the tissue content of phosphorus (P), calcium (Ca), potassium (K) and sodium (Na), and carbon and nitrogen stable isotopes, were used to assess nutritional status and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cerrado; Campos rupestres; Dioecy; Plant sex; Resource allocation; Rupestrian grasslands; Serra do Cipó. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000200229 |
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| Torres Robles,SS; Peter,G; Tur,NM. |
| Myriophyllum aquaticum (Vell.) Verdc. is native of South America and has a pantropical distribution. This species has been cited as dioecious, monoecious and polygamous. The purpose of this paper was to contribute to the discussion of its sexual condition, based on herbarium material, and supported by field observations. Herbarium material from Argentina was examined. Also, twenty branches from the Punta Lara Nature Reserve (Buenos Aires, Argentina) were periodically sampled to record the sex of flowers present on each whorl during the flowering period of 2002. Both in herbarium material and in field, we observed specimens with branches bearing either female or male, and specimens with female and male flowers on the same branch. Some of these materials... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dioecy; Monoecy; Myriophyllum aquaticum; Punta Lara. |
| Ano: 2011 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572011000200003 |
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| Vieira,Fábio de Almeida; Appolinário,Vivette; Fajardo,Cristiane Gouvêa; Carvalho,Dulcinéia de. |
| We investigated the reproductive biology of Protium spruceanum (Benth.) Engler in vegetation corridors of secondary Atlantic forest in Lavras, southern Minas Gerais State, Brazil. The reproductive phenology was investigated fortnightly over a one year period. Floral biology studies involved pollen viability analysis, nectar production, stigmatic receptivity, pollen tube growth, visiting insect species and visit rates. The small, pale yellowish flowers (0.3-0.4 cm diameter) are functionally unisexual and organized in dense inflorescences (ca. 45 flowers). P. spruceanum presented annual flowering between September and November. Staminate flowers supplied a high percentage of viable pollen (90.6%) and relatively abundant nectar (x = 4.5 μL). Pistillate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dioecy; Floral visitors; Flowering; Fruiting; Secondary forest. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042010000400018 |
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| Anderson, C.. |
| Molecular evidence shows the Old World genus Ryssopterys (Malpighiaceae) nested within the New World genus Stigmaphyllon; therefore, Ryssopterys is here transferred to Stigmaphyllon as subg. Ryssopterys. The subgenera share most vegetative and fruit characters. Subgenus Stigmaphyllon comprises 92 species characterized by hermaphrodite, bilaterally symmetrical flowers. Subgenus Ryssopterys includes 21 species that appear androdioecious but are probably functionally dioecious; the flowers are either hermaphrodite but likely functionally female, owing to inaperturate pollen, or male with a rudimentary gynoecium. All species have radially symmetrical flowers in which all parts of each floral whorl are equal; they lack calyx glands as well as the stylar... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Androdioecy; Australia; Dioecy; Indonesia; Malpighiaceae; New Caledonia; New Guinea; Ryssopterys; Stigmaphyllon. |
| Ano: 2011 |
URL: http://www.repository.naturalis.nl/record/524543 |
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