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Abstract:

The function of orbicules has been a matter of speculation for a long time and until now no satisfactory answer has been put forward. We propose two hypotheses that could contribute to the elucidation of their function: (1) that anemophilous and 'buzz pollination' species have microechinate orbicules; and (2) that microechinate orbicules are advantageous for pollen release in both pollination modes. To test the first hypothesis, orbicule morphology of species in which the pollen is released by anther shaking (20 anemophilous and three with buzz-pollination) was analysed. We also conducted a literature review, noting the orbicule surface type and the presence of floral traits suggesting that pollen is released by anther shaking. Ninety-two percent of the species with microechinate orbicules are anemophilous or present 'buzz pollination'. Orbicules without spinules are present in species that lack floral traits linked to anther shaking for pollen release. To test the second hypothesis, a computational simulation that reveals the electric field produced by electrostatically charged orbicules was used. Results showed that the field is increased at the tip of each orbicule spinule. Therefore, an anther loculus surface coated by pointed structures increases the repulsion force of the pollen grains. This is an advantage when pollen is released by shaking the anther. © 2019 CSIRO.

Registro:

Documento: Artículo
Título:Could microechinate orbicules be related to the release of pollen in anemophilous and 'buzz pollination' species?
Autor:Galati, B.G.; Gotelli, M.M.; Dolinko, A.E.; Rosenfeldt, S.
Filiación:Universidad de Buenos Aires, Facultad de Agronomía, Departamento de Recursos Naturales y Ambiente, Cátedra de Botánica General, Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2290, Buenos Aires, C1425FQB, Argentina
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Biodiversidad y Biología Experimental, Buenos Aires, Argentina
Universidad de Buenos Aires, Facultad de Agronomía, Departamento de Ingeniería Agrícola y Uso de la Tierra Cátedra de Física, Buenos Aires, Argentina
Palabras clave:anemophilous pollination mode; electrostatic field; microechinate orbicule
Año:2019
Volumen:67
Número:1
Página de inicio:16
Página de fin:35
DOI: http://dx.doi.org/10.1071/BT18169
Título revista:Australian Journal of Botany
Título revista abreviado:Aust. J. Bot.
ISSN:00671924
CODEN:AJBTA
Registro:http://digital.bl.fcen.uba.ar/collection/paper/document/paper_00671924_v67_n1_p16_Galati

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Citas:

---------- APA ----------
Galati, B.G., Gotelli, M.M., Dolinko, A.E. & Rosenfeldt, S. (2019) . Could microechinate orbicules be related to the release of pollen in anemophilous and 'buzz pollination' species?. Australian Journal of Botany, 67(1), 16-35.
http://dx.doi.org/10.1071/BT18169
---------- CHICAGO ----------
Galati, B.G., Gotelli, M.M., Dolinko, A.E., Rosenfeldt, S. "Could microechinate orbicules be related to the release of pollen in anemophilous and 'buzz pollination' species?" . Australian Journal of Botany 67, no. 1 (2019) : 16-35.
http://dx.doi.org/10.1071/BT18169
---------- MLA ----------
Galati, B.G., Gotelli, M.M., Dolinko, A.E., Rosenfeldt, S. "Could microechinate orbicules be related to the release of pollen in anemophilous and 'buzz pollination' species?" . Australian Journal of Botany, vol. 67, no. 1, 2019, pp. 16-35.
http://dx.doi.org/10.1071/BT18169
---------- VANCOUVER ----------
Galati, B.G., Gotelli, M.M., Dolinko, A.E., Rosenfeldt, S. Could microechinate orbicules be related to the release of pollen in anemophilous and 'buzz pollination' species?. Aust. J. Bot. 2019;67(1):16-35.
http://dx.doi.org/10.1071/BT18169