Bees use signals from plants to identify worthwhile visits. They learn quickly to differenciate mainly their floral odor than their colour. In some species the flowers remain open, intact and turgid until they are pollinated (anthesis) after which they are no longer attractive to pollinators (post-anthesis). Pollinators use fragrance for distance orientation, approach, landing, feeding and associative learning. The aim of this work was to study the variation of odor profile between anthesis and post-anthesis produced in flowers of different cultivars of Prunus Persica (L.) batsch, using an electronic nose since odor is a communication between flowering plants and bees. Visual results on field showed that peach flowers are generally more visited in the anthesis stage. Among all the analysed cultivars, Forastero cultivar was the only one visited in this floral stage. Statistical analysis of the electronic nose data showed that doped semiconductuvtive SnO 2 sensors could differenciate between stages (anthesis and post-anthesis) only in case of Forastero cultivar.
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