Ultrastructure and cytochemistry of the pearl gland in Piper regnellii (Piperaceae)

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dc.contributor.authorda Silva, EMJ
dc.contributor.authorMachado, SR
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:48:17Z
dc.date.available2014-05-20T13:48:17Z
dc.date.issued1999-01-01
dc.description.abstractPearl glands are scattered throughout the lamina of developing leaves and rarely found on adult leaves of Piper regnellii (Piperaceae). The pearl gland is a bicellular secretory trichome composed of a short broad basal cell and a spatula-like, semiglobular apical cell. Four different stages of the pearl grand were determined during its ontogenesis: origin, pre-secretory, secretory and post-secretory. During the pre-secretory stage, mitochondria, ribosomes, dictyosomes, rough endoplasmic reticulum, and plastids with electron dense inclusions were present in the cytoplasm of the apical cell. During the secretory stage, the most remarkable characteristics of the apical cell are the proliferation of dictyosomes and their vesicles, rough endoplasmic reticulum, and modified plastids. At this stage, electron-dense oil drops occur in the plastids as well as scattered within the cytoplasm, proteins and polysaccharides are seen in the plastids, vesicles, and vacuoles. Only polysaccharides are present in the periplasmic space, wall cavities, and on the surface of the apical cell. The polysaccharides are one of the main components of the mucilagenous exudate that covers the developing leaf structures. The apical cell of the senescing trichomes undergoes a progressive degeneration of its cellular components, the plastids being the first organelles to undergo lysis.en
dc.description.affiliationUNESP, Area Bot, Curso Pos Grad Ciências Biol, IB, BR-18618000 Botucatu, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Biociencias, Dept Bot, BR-18618000 Botucatu, SP, Brazil
dc.description.affiliationUnespUNESP, Area Bot, Curso Pos Grad Ciências Biol, IB, BR-18618000 Botucatu, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Biociencias, Dept Bot, BR-18618000 Botucatu, SP, Brazil
dc.format.extent623-634
dc.identifierhttp://dx.doi.org/10.1111/j.1756-1051.1999.tb01152.x
dc.identifier.citationNordic Journal of Botany. Copenhagen K: Nordic Journal of Botany, v. 19, n. 5, p. 623-634, 1999.
dc.identifier.doi10.1111/j.1756-1051.1999.tb01152.x
dc.identifier.issn0107-055X
dc.identifier.lattes2653496390637757
dc.identifier.urihttp://hdl.handle.net/11449/17215
dc.identifier.wosWOS:000084830000013
dc.language.isoeng
dc.publisherNordic Journal of Botany
dc.relation.ispartofNordic Journal of Botany
dc.relation.ispartofjcr0.846
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleUltrastructure and cytochemistry of the pearl gland in Piper regnellii (Piperaceae)en
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406074.html
dcterms.rightsHolderNordic Journal of Botany
unesp.author.lattes2653496390637757
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt

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