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Brazilian Journal of Biology

Print version ISSN 1519-6984

Braz. J. Biol. vol.70 no.4 São Carlos Nov. 2010 

Increase in canola production for the honeybees pollination



Researchers of Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS) and Fundação Estadual de Pesquisa Agropecuária (FEPAGRO) studied the honeybees behavior on canola flowers. The research's authors found that these bees increase pods productivity of this culture in Rio Grande do Sul, main Brazilian State producer of culture, as published in Brazilian Journal of Biology, in vol. 70.4.

The field observations was made in a commercial farming located in the State northwest and the data analysis made at Entomology Lab at PUCRS, in Porto Alegre. The pollinator potential of these bees was verifiy from the evaluation of its behavior, emphasizing the flower number visited per plant, time on flowers, reproductive structures touched for bees, and resources collected for its (pollen/nectar). The data analisys allows to identify the transfer potential for bees from anthers pollen (male reproductive structure) to the flower stigma (female reproductive structure). If done effectively, the pollination has as consequence the full pods production. Thus, to verify the pollinator potential of these insects, was follow the canola floral development and were follow the 206 bees visit behavior on flowers, considering the factors above mentioned.

The observations showed that bees visited the flowers preferably in its receptive moment to the pollen grains, that visited few flowers per plant, that spent for a little time on its, that when looking for nectar and pollen, invariably touched the reproductive structures and that, as consequence, transferred pollen grains between flowers, promoting thus, the pollination. Concomitantly to the floral development, this behavior made for the bees allows to consider its as canola potential pollinators.

It's possible to infer that these bees intensification in this agricultural system can significantly benefit its production in canola cultivars in Rio Grande do Sul. These results corroborate others studies worldwide, that attach crops of excellent quality to the honeybees presence nearby fiels.

Worldwide the canola is the third oleaginous plant more produced, having as main inputs the comestible oil production and too its utilization as biodiesel, oil extracted from its seeds. In Rio Grande do Sul, stands out as an economic alternative for enabling the vegetable oils production in winter, allowing the rotation with others traditional crops. The possibility of pollinators bees management to the productivity canola seeds increase, indicated in this research, alert to need of pollination services in this agricultural system.



Annelise de Souza Rosa
Departamento de Ecologia e Biodiversidade, PUC-RS

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