Hydrophobic Trichome Layers and Epicuticular Wax Powders in Bromeliaceae

dc.contributor.authorPierce, Simon
dc.contributor.authorMaxwell, Kate
dc.contributor.authorGriffiths, Howard
dc.contributor.authorWinter, Klaus
dc.date.accessioned2007-05-30T19:44:28Z
dc.date.available2007-05-30T19:44:28Z
dc.date.issued2001
dc.description.abstractThe distinctive foliar trichome of Bromeliaceae has promoted the evolution of an epiphytic habit in certain taxa by allowing the shoot to assume a significant role in the uptake of water and mineral nutrients. Despite the profound ecophysiological and taxonomic importance of this epidermal structure, the functions of nonabsorbent trichomes in remaining Bromeliaceae are not fully understood. The hypothesis that light reflection from these trichome layers provides photoprotection was not supported by spectroradiometry and fluorimetry in the present study; the mean reflectance of visible light from trichome layers did not exceed 6.4% on the adaxial surfaces of species representing a range of ecophysiological types nor was significant photoprotection provided by their presence. Several reports suggesting water repellency in some terrestrial Bromeliaceae were investigated. Scanning electron microscopy (SEM) and a new technique-fluorographic dimensional imaging (FDI)-were used to assess the interaction between aqueous droplets and the leaf surfaces of 86 species from 25 genera. In the majority of cases a dense layer of overlapping, stellate or peltate trichomes held water off the leaf epidermis proper. In the case of hydrophobic tank‐forming tillandsioideae, a powdery epicuticular wax layer provided water repellency. The irregular architecture of these indumenta resulted in relatively little contact with water droplets. Most mesic terrestrial Pitcairnioideae examined either possessed glabrous leaf blades or hydrophobic layers of confluent trichomes on the abaxial surface. Thus, the present study indicates that an important ancestral function of the foliar trichome in Bromeliaceae was water repellency. The ecophysiological consequences of hydrophobia are discussed.
dc.format.extent8935607 bytes
dc.format.extent1371–1389
dc.format.mimetypeapplication/pdf
dc.identifier0002-9122
dc.identifier.citationPierce, Simon, Maxwell, Kate, Griffiths, Howard, and Winter, Klaus. 2001. "<a href="https://repository.si.edu/handle/10088/1489">Hydrophobic Trichome Layers and Epicuticular Wax Powders in Bromeliaceae</a>." <em>American Journal of Botany</em>, 88, (8) 1371–1389. <a href="https://doi.org/10.2307/3558444">https://doi.org/10.2307/3558444</a>.
dc.identifier.issn0002-9122
dc.identifier.urihttp://hdl.handle.net/10088/1489
dc.language.isoen_US
dc.publisherWiley
dc.relation.ispartofAmerican Journal of Botany 88 (8)
dc.titleHydrophobic Trichome Layers and Epicuticular Wax Powders in Bromeliaceae
dc.typearticle
sro.description.unitSTRI
sro.identifier.doi10.2307/3558444
sro.identifier.itemID50584
sro.identifier.refworksID69723
sro.identifier.urlhttps://repository.si.edu/handle/10088/1489
sro.publicationPlaceHoboken, New Jersey

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