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Cucumis sativus L. - Cucurbitaceae - cucumber, Gurke
Annual creeping vine, native to India and Southeast Asia, commonly cultivated in tropical and temperate regions; leaves broadly ovate-cordate; male flowers campanulate, white-yellow, densely white pubescent; female flowers solitary or fascicled, pedicels pubescent, ovary fusiform; fruit cylindric or oblong, up to 50cm long, usually verrucose.
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200022616
„Traditional cultivars produce male blossoms first, then female, in about equivalent numbers. Newer gynoecious hybrid cultivars produce almost all female blossoms. They may have a pollenizer cultivar interplanted, and the number of beehives per unit area is increased, but temperature changes induce male flowers even on these plants, which may be sufficient for pollination to occur.“
http://en.wikipedia.org/wiki/Cucumber
„The volatile components of cucumbers and muskmelons were analyzed by a technique which reveals the odorants having the highest odor units (ratio of the concentration to the odor threshold). (E/Z)-2,6-Nonadienal, followed by (Z)-2-nonenal and (E)-2-nonenal were the most significant odorants of cucumbers.“
[Schieberle, P., Ofner, S., & Grosch, W. (1990). Evaluation of potent odorants in cucumbers (Cucumis sativus) and muskmelons (Cucumis melo) by aroma extract dilution analysis. Journal of Food Science, 55(1), 193-195.]
„The volatile (E,Z)-2,6-nonadienal (NDE) gives cucumber its 'fresh green' flavor23 and confers resistance to some bacteria and fungi24. Lipoxygenase and one type of hydroperoxide lyase, 9-HPL, synthesize NDE from linolenic acid precursors. Genes encoding enzymes with 9-HPL activity are rarely found in other plants25. However, cucumber contains two tandem HPL genes, one of which has been experimentally confirmed as encoding an enzyme with 9-HPL activity25. The expansion of the LOX gene family and the duplicated HPL genes may be related to the high level of NDE synthesis in cucumber.“
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http://www.nature.com/ng/journal/v41/n12/suppinfo/ng.475_S1.htmlHuang, S., Li, R., Zhang, Z., Li, L., Gu, X., Fan, W., … & Miao, H. (2009). The genome of the cucumber, Cucumis sativus L. Nature genetics, 41(12), 1275-1281.