Artículos de revistas
Floral Biology And Pollination Mechanisms In Two Viola Species - From Nectar To Pollen Flowers?
Registro en:
Annals Of Botany. , v. 91, n. 3, p. 311 - 317, 2003.
3057364
10.1093/aob/mcg025
2-s2.0-0037369367
Autor
Freitas L.
Sazima M.
Institución
Resumen
The genus Viola is represented by four related species in Brazil belonging to section Leptidium, one of the most primitive sections in the genus. Floral biology and pollination by bees were studied in Viola cerasifolia and V. subdimidiata in high-altitude areas in south-eastern Brazil. Flowers are zygomorphic and spurred. The five stamens are arranged in a cuff around the ovary, and pollen is released by means of apical connective projections, which form a cone surrounding the base of the style. The connective projections of the inferior stamens are elongated and curved to form a hook-shaped structure. Nectar-secreting tissue can occur in the basal connective appendages of the inferior stamens, which project into the spur. Flowers of V. subdimidiata secreted a mean volume of 0.14 μl nectar over a 24-h period; approx. 40 % of flowers did not secrete any nectar. The main pollinators of these Viola species are female bees belonging to the genus Anthrenoides (Andrenidae), which search mainly for pollen. These bees seem to be oligolectic and obtain large amounts of pollen from Viola by vibrating the flowers or by moving the hook repeatedly back and forth. Males of Anthrenoides patrol Viola clusters and also feed on nectar, acting as secondary pollinators. The basic floral structure in the genus Viola fits that of 'nectar flowers'. The uncommon hook-shaped projections, scanty nectar production, and behaviour of pollinators suggest that V. cerasifolia and V. subdimidiata are shifting their reward for pollinators from nectar to pollen. Based on floral morphology, this shift may be widespread in Viola sect. Leptidium. © 2003 Annals of Botany Company. 91 3 311 317 Ballard H.E., Jr., Sytsma, K.J., Kowal, R.R., Shrinking the violets: Phylogenetic relationships of infrageneric groups in Viola (Violaceae) based on internal transcribed spacer DNA sequences (1999) Systematic Botany, 23, pp. 439-458 Beattie, A.T., Studies in the pollination ecology of Viola. 1. The pollen-content of stigmatic cavities (1969) Watsonia, 7, pp. 142-156 Beattie, A.T., The floral biology of three species of Viola (1969) New Phytologist, 68, pp. 1187-1201 Beattie, A.T., Pollination mechanisms in Viola (1971) New Phytologist, 70, pp. 343-360 Beattie, A.T., The pollination ecology of Viola. 2. Pollen loads of insect-visitors (1972) Watsonia, 9, pp. 13-25 Beattie, A.T., Floral evolution in Viola (1974) Annals of the Missouri Botanical Garden, 61, pp. 781-793 Buchmann, S.L., Buzz pollination in angiosperms (1983) Handbook of Experimental Pollination Biology, pp. 73-113. , Jones CE, Little RJ, eds. New York: Scientific and Academic Edit Clausen, J., Chromosome number and relationship of species in the genus Viola (1927) Annals of Botany, 41, pp. 677-714 Clausen, J., Chromosome number and relationship of some North American species of Viola (1929) Annals of Botany, 43, pp. 741-764 Eiten, G., A vegetação do Estado de São Paulo (1970) Boletim do Instituto de Botânica (São Paulo), 7, pp. 1-147 Eiten, G., Natural Brazilian vegetation types and their causes (1992) Anais da Academia Brasileira de Ciências, 64, pp. 35-65 Freitas, L., (2002) Biologia da Polinização em Campos de Altitude no Parque Nacional da Serra da Bocaina, , SP. PhD Thesis, Universidade Estadual de Campinas, São Paulo, Brazil Gaglianone, M.C., Behavior on flowers, structures associated to pollen transport and nesting biology of Perditomorpha brunerii and Cepharlus anomalus (Hymenoptera: Colletidae, Andrenidae) (2000) Revista de Biología Tropical, 48, pp. 89-99 Gershoy, A., Studies in North American violets. I. General considerations (1928) Vermont Agricultural Experiment Station Bulletin, p. 279 Gottsberger, G., Silberbauer-Gottsberger, I., Evolution of flower structures and pollination in neotropical Cassiinae (Caesalpinaceae) species (1988) Phyton, 28, pp. 293-320 Harder, L.D., Thomson, J.D., Evolutionary options for maximizing pollen dispersal of animal-pollinated plants (1989) American Naturalist, 133, pp. 323-344 Herrera, C.M., Biología y ecología de Viola cazorlensis. I. Variabilidad de caracteres florales (1988) Anales del Jardín Botánico de Madrid, 47, pp. 125-138 Houston, T.F., Ladd, P.G., Buzz pollination in the Epacridaceae (2002) Australian Journal of Botany, 50, pp. 83-91 Johansen, D.A., (1940) Plant Microtechnique, , New York: McGraw-Hill Knuth, P., (1904) Handbuch der Blütenbiologie, 3, p. 1. , Leipzig: Verlag von Wilhelm Engelmann Kubitzki, K., Amaral, M.C.E., Transference of function in the pollination system of the Ochnaceae (1991) Plant Systematics and Evolution, 177, pp. 77-80 Linsley, E.G., The ecology of solitary bees (1958) Higardia, 27, pp. 543-597 Lovell, J.H., (1918) The Flower and the Bee, , New York: Charles Scribner's Sons Morellato, L.P.C., Haddad, C.F.B., Introduction: The Brazilian Atlantic Forest (2000) Biotropica, 32, pp. 786-792 Mori, S.A., Boom, B.M., Prance, G.T., Distribution patterns and conservation of eastern Brazilian coastal forest tree species (1981) Brittonia, 33, pp. 233-245 Radford, A.E., Dickinson, W.C., Massey, J.R., Bell, C.R., (1974) Vascular Plant Systematics, , New York: Harper & Tow Publishing Safford, H.D., Brazilian Páramos I. An introduction to the physical environment and vegetation of the campos de altitude (1999) Journal of Biogeography, 26, pp. 693-712 Sprengel, C.K., (1793) Das Entdeckte Geheimniss der Natur im Bau und in der Befruchtung der Blumen, , Berlin: Vieweg sen. Reprint 1972, Lehre: J Cramer & HK Swann, Codicote, New York: Wheldon & Wesley Stehmann, J.R., Semir, J., Biologia reprodutiva de Calibrachoa elegans (Miers) Stehmann & Semir (Solanaceae) (2001) Revista Brasileira de Botânica, 24, pp. 43-49 Vogel, S., Evolutionary shifts from reward to deception in pollen flowers (1978) The Pollination of Flowers by Insects, pp. 89-96. , Richards A, ed. London: Academic Press Vogel, S., Remarkable nectaries: Structure, ecology, organophyletic perspectives III. Nectar ducts (1998) Flora, 193, pp. 113-131 Waser, N.M., Interspecific pollen transfer and competition between co-occurring plant species (1978) Oecologia, 36, pp. 223-236 Westerkamp, C., Pollen in bee-flower relations: Some considerations on melittophily (1996) Botanica Acta, 109, pp. 325-332 Wittmann, D., Radtke, R., Cure, J.R., Schifino-Wittmann, M.T., Coevolved reproductive strategies in the oligolectic bee Callonychium petuniae (Apoidea. Andrenidae) and three purple flowered Petunia species (Solanaceae) in southern Brazil (1990) Zeitschrift für Zoologische Systematik und Evolutionsforschung, 28, pp. 157-165 Zeisler, M., Über die Abgrenzung der eigentlichen Narbenfläche mit Hilfe von Reaktionen (1938) Beihefte zum Botanischem Zentralblatt, 58, pp. 308-318