Cockroaches are not considered typical plant pollinators, however, there are some exceptions to this rule. One of them is the South American species Amazonina platystylata, which is known for pollinating a dioecious shrub Clusia blattophila. This clusia is quite abundant on the Nouragues inselberg in French Guyana and is endemic there. In my research I was focused on the plant-animal communication. The aim of this thesis was to find possible behavioural response to the flower scent of clusia or to the compounds of flower scent, as clusia flowers differ in compounds of scent. Male flowers produce acetoin as a major compound. This compound is also found in female flowers but only at lower levels and in the first night of flowering. When acetoin was added to two days old female flowers, the amount of cockroaches' visits in such flowers increased to the same level as observed on male flowers. Until now there were no records about biology of this cockroach species and neither was morphology of their glands described. I have found out that both males and females of A. platystylata have tergal modification on the 7th to 8th tergite; a modification that could be connected to their glands. Evaporation plate on the first tergal shield in A. platystylata is described in this thesis for the first time. Key...

South American plant Clusia blattophila, growing on Nouraghes of French Guiana, produces relatively large amounts of volatile substances in the fragrance of its flowers. C. blattophila is dioecious plant with different flowering time of monosex flowers Male flowers bloom for one night, while female flowers bloom two nights. The volatiles were adsorbed to the adsorbent and washed out with hexane with internal standard. Analysis was performed by two-dimensional gas chromatography with mass spectrometric detection. The aim of my thesis was to determine the qualitative and quantitative characteristics of flower scents of both sexes. I also studied, whether there are differences in production of the major fragrance component, acetoin, during the first night of blooming. The flower fragrance is complex blend of volatiles. In total, 43 different chemicals were identified. Among them were monoterpenes (α-pinene, camphene, β-pinene, myrcene, limonene, (E)-β-ocimene, camphor) sesquiterpenes (α-copaene, β-caryophyllene, cis-α-bergamotene, trans-α-bergamotene, aromadendrene, (E,E)-α-farnesene, δ-cadinene), aldehydes (1-pentanal, 1-hexanal, 1-octanal, n-decanal), also four ketones (acetoin and its dimer, 2,5-hexanedione, 6-methylhept-5-en-2-one), alcohol butane-2,3-diol, carboxylic acid 2-methylpropanoic,...